Designing Buildings - User contributions [en]

Permitted development

2024-08-27T16:23:09Z

Timbral Acoustic Consultants:

= Introduction =

Generally it is up to a local planning authority to decide whether to allow a particular development or not, the definition of which has changed slighty. However, in England and Wales, the [http://www.legislation.gov.uk/uksi/1995/418/contents/made Town and Country Planning (General Permitted Development) Order 1995] enables central government to permit certain types of developments known as permitted developments.

These are generally minor changes to existing properties. Permitted developments do not require approval from the local planning authority as permission is granted by the Order.

Examples of permitted developments are:

* Certain enlargements or alterations to houses (not exceeding 50% of the curtilage).
* Provision of certain pet enclosures, sheds and fuel storage containers (not exceeding 50% of the curtilage).
* Certain porches, doors and windows.
* Installation of antenna and satellite dishes (up to specified sizes).
* Gates, fences, walls and other enclosures (no more than 2 m high).
* The provision of certain hard surfaces and means of access to a highway.
* Installation and alterations to certain chimneys.
* The installation of CCTV for security purposes.
* Exterior painting (other than advertisements).
* Internal alterations.
* Certain microgeneration equipment.
* Certain changes of use class.
* Temporary structures and plant for construction purposes.
* Temporary structures remaining for no more than 28 days.
* Works by certain statutory authorities.
* Building operations consisting of the demolition of a building.

= Restrictions =

There are a great number of complex and detailed restrictions and conditions on each of these permitted development classes.

There are further restrictions for certain areas and building types:

* Listed buildings.
* Conservation areas.
* National parks.
* Areas of outstanding natural beauty.

In addition, local authorities are able to remove permitted development rights (PDR) that are of particular significance given the character of an area by issuing an Article 4 Direction.

There may also be conditions on existing permissions preventing certain types of development.

In certain cases, even though a development is permitted, prior approval of some issues is required from the local authority. This includes:

* Specific issues to do with agricultural land, such as the purpose, siting and design of agricultural buildings as well as the construction of a private way, the siting of excavation or deposit or the siting and appearance of tanks.
* Similar issues for land used for the purposes of forestry.
* Erection of plant, machinery, buildings, or structures on land used as a mine.
* The demolition of a building.
* Siting and appearance of telecommunications masts.

See Prior approval for more information.

This means that establishing whether a proposal constitutes a permitted development or not is considerably more complicated than it may at first seem. Often the best way to determine whether a development is permitted or not is to ask the local planning authority. This can be done by asking for a ‘lawful development certificate’ for which a fee will be charged.

= Policy changes =

=== 2013 ===

In May 2013, the Town and Country Planning (General Permitted Development) (Amendment) (England) Order 2013 came into force, making changes to permitted development rights. These amendments include making it easier to change between certain use classes, and permitting larger extensions to domestic and commercial premises. Some of these amendments permit development only with prior approval of certain aspects or beyond certain sizes.

Following this amendment, some local authorities have introduced article 4 directions, in particular to prevent change of use class from office to residential use. It has yet to be seen whether the Secretary of State will allow these directions to stand.

Further changes are proposed to permitted development rights, to give greater flexibility to changes of use, allowing:

* Shops and financial and professional services to change use to a dwelling house.
* Existing buildings used for agricultural purposes of up to 150 sq. m to change to residential use.
* Retail uses to change to banks and building societies only.
* Premises used as offices, hotels, residential and non-residential institutions, and leisure and assembly to be able to change use to nurseries providing childcare.
* A building used for agricultural purposes of up to 500 sq. m to be used as a new state funded school or a nursery providing childcare.

However, following concerns that there would be a spate of agricultural building conversions in National Parks and Areas of Outstanding National Beauty, Planning Minister Nick Boles stated:

“...the intention behind the proposed permitted developed right is to bring forward more housing on land that is already developed, and to make maximum use of the buildings that our ancestors saw fit to build, so that we do not have to put up any more buildings on green fields than is necessary to meet our housing and other needs....I recognise, however, and the Government recognise, that national parks and AONBs are so called for a reason and have a special status. It is a status we must respect, and it is important that we think hard and listen to the arguments put to us about the appropriateness of this measure in those areas." (ref. [http://www.publications.parliament.uk/pa/cm201314/cmhansrd/cm140224/debtext/140224-0004.htm#14022436000009 Hansard] 26 February 2014.)

=== 2014 ===

In March 2014, the Chancellor’s [https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/293759/37630_Budget_2014_Web_Accessible.pdf 2014 budget] announced a further review of the General Permitted Development Order, to create ‘…a three-tier system to decide the appropriate level of permission, using permitted development rights for small-scale changes, prior approval rights for development requiring consideration of specific issues, and planning permission for the largest scale development.’

He also announced fresh consultation to assess:

* Specific change of use measures, permitting greater flexibility for change of use to residential use, from warehouses, light industry structures and certain sui generis buildings (buildings that do not fall into any one use class, such as theatres, multiple occupation houses, scrap yards, and so on).
* Allowing greater flexibilities to change facilities such as car parks and loading bays and non-retail facilities.
* Creating a much wider ‘retail’ use class, excluding betting shops and payday loan shops.

On 31 July 2014, Brandon Lewis, newly-appointed Minister of State for Housing and Planning at the Department for Communities and Local Government (DCLG), announced proposals to make the temporary permitted development rights that allow offices to be converted into new homes permanent. In 2016, The Department for Communities and Local Government then laid before Parliament regulations to make this permanent from 6 April 2016.

Lewis also proposed making it easier to convert empty and redundant buildings into new homes and to ensure planning conditions are cleared on time so that new homes that have planning permission can be built without delay. (Ref. DCLG, [https://www.gov.uk/government/news/cutting-red-tape-to-breathe-new-life-into-local-communities Making the planning system work more efficiently and effectively, Giving communities more power in planning local development], 31 July 2014.)

=== 2016 ===

In April 2016, the government published [https://www.gov.uk/government/publications/permitted-development-rights-for-householders-technical-guidance Permitted development rights for householders: technical guidance] to help householders understand the detailed rules on permitted development and the terms used.

=== 2018 ===

In May 2018, the government announced a consultation about whether the early stages of shale exploration (fracking) should be treated as permitted development, and the circumstances in which this might be appropriate. Ref [https://www.gov.uk/government/news/new-measures-to-back-british-shale-gas-exploration https://www.gov.uk/government/news/new-measures-to-back-british-shale-gas-exploration]

== 2019 ==

In May 2019, following a consultation; [https://www.gov.uk/government/consultations/planning-reform-supporting-the-high-street-and-increasing-the-delivery-of-new-homes Planning reforms – supporting the high street and increasing the delivery of new homes], the government announced that permitted development rights allowing increased size limits for single-storey rear extensions would be made permanent.

The '[https://www.gov.uk/government/publications/permitted-development-rights-for-householders-technical-guidance Permitted development rights for householders: technical guidance]' was updated in September of 2019 and republished.

== 2020 ==

On 9 April 2020, a time-limited permitted development right was brought into force in response to the Coronavirus outbreak. This introduced wide-ranging powers allowing emergency construction of, or change of use to, medical facilities and related residential accommodation. Ref [http://www.legislation.gov.uk/uksi/2020/412/contents/made http://www.legislation.gov.uk/uksi/2020/412/contents/made]

In June 2020, the regulations were amended to ensure that new homes developed through permitted development rights provide adequate natural light for the occupants. Ref [http://www.legislation.gov.uk/uksi/2020/632/pdfs/uksiem_20200632_en.pdf http://www.legislation.gov.uk/uksi/2020/632/pdfs/uksiem_20200632_en.pdf]

On 21 July 2020, Housing Secretary Robert Jenrick announced new laws laid in Parliament meaning full planning applications will not be required to demolish and rebuild unused buildings as homes and commercial and retail properties can be quickly repurposed to help revive our high streets and town centres. Homeowners will also be able to add up to 2 additional storeys to their home to create new homes or more living space through a fast track approval process. The rules are due to come into effect in September 2020. Ref [https://www.legislation.gov.uk/uksi/2020/755/contents/made https://www.legislation.gov.uk/uksi/2020/755/contents/made]

On 30 September 2020 Housing Secretary Robert Jenrick announced that new homes delivered through permitted development rights would have to meet the Nationally Described Space Standard. This begins at 37m² of floorspace for a new one bed flat with a shower room. Ref [https://www.gov.uk/government/news/permitted-development-homes-to-meet-space-standards https://www.gov.uk/government/news/permitted-development-homes-to-meet-space-standards]

On 30 December 2020, Chandru Dissanayeke Director, Building Safety Programme for the Ministry of Housing, Communities & Local Government published a letter to Local Planning Authorities in England to inform them of an amendment to the Town and Country Planning (General Permitted Development) (England) Order 2015 (“the GPDO”).

The amendment introduces an additional matter for prior approval to two permitted development rights which allow extra storeys to be added to existing buildings. These rights are: Class A new dwellinghouses on detached blocks of flats and Class AA new dwellinghouses on detached buildings in commercial or mixed use of Part 20 to the Order.

This change requires a developer seeking prior approval under those classes in relation to an existing building, which is 18 metres or more in height, to provide a report from a chartered engineer or other competent professional confirming that the external wall construction of the existing building complies with paragraph B4(1) of Schedule 1 to the Building Regulations 2010 (S.I. 2010/2214) to the local planning authority. The purpose of this report is to confirm that the external walls of the building will adequately resist the spread of fire over the walls and from one building to another, having regard to the height, use and position of the building. Ref [https://www.legislation.gov.uk/uksi/2020/1459/made https://www.legislation.gov.uk/uksi/2020/1459/made]

== 2021 ==

See: CLC calls for rethink of permitted development rights.

== 2023 ==

In [https://www.legislation.gov.uk/uksi/2023/747/made 27th July 2023 changes to permitted development rights] include;

* Local Authority definition; This change extends the definition of a local authority to a National Park Authority and the Broads Authority to allow these bodies to benefit from the permitted development rights.
* Prison fences; This change allows for the alteration or erection of prison fences up to 5.5 metres above ground level without planning under an a new class; Class MA.
* Extension to 60 days for the temporary use of land under certain conditions; This change updates Schedule 2, Part 4 of Class B permitted development rights for the use of 'any land for any purpose for not more than 28 days in total in any calendar year… and the provision on the land of any moveable structure for the purposes of the permitted use'. The new permitted development right is added that allows the temporary use of land as a recreational campsite for up to 60 days per calendar year, subject to limitations and conditions. These limitations include prior approval from the local planning authority, the number of pitches (below 50), restrictions on particular types of sites (SSI, listed buildings etc), the provision of facilities but also and importantly "for the siting of any caravan except a caravan which is used as a motor vehicle designed or adapted for human habitation."

== Classes of Permitted Development ==

=== Class MA ===

Class MA permitted development rights allow certain commercial properties to be converted into residential use without the need for a full planning application. These rights, introduced in England in August 2021, fall under the General Permitted Development Order (GPDO) and apply specifically to changing the use of buildings from commercial, business, or service (Use Class E) to residential use (Use Class C3).

Development under Class MA is permitted subject to a process of Prior Approval. The application may require assessments of natural light, [https://www.timbral.co.uk/post/navigating-noise-impact-assessments-for-class-ma-permitted-development-a-comprehensive-guide noise from commercial premises], contamination, flooding risks and transport impacts.

= Related articles on Designing Buildings =

* Alterations to existing buildings.
* Article 4 direction.
* Change of use class.
* Class Q permitted development.
* CLC calls for rethink of permitted development rights.
* Conservation area.
* Enforcement notice.
* Established use certificate.
* IHBC responds to supporting defence infrastructure and the future of time-limited permitted development rights.
* Lawful development certificate.
* Listed building.
* Local development order.
* National planning policy framework.
* Permitted development: The end of the high street or a blessing in disguise?
* Planning enforcement.
* Planning permission.
* Prior approval.
* Renovation.
* Section 215.
* Sui generis.
* Town and Country Planning Act.
* Town and Country Planning (General Permitted Development) (Amendment) (England) Order.
* Use class.

= External references =

* Written statement to Parliament, [https://www.gov.uk/government/speeches/change-of-use-new-homes Change of use: new homes], Planning Minister Nick, Boles 6 February 2014.
* [http://www.legislation.gov.uk/uksi/1995/418/contents/made Town and Country Planning (General Permitted Development) Order 1995].
* Home Building and Renovating: A Guide to Permitted Development Rules. November 2012.
* Very detailed guidance on what is and is not permitted by the Order is provided in the Planning Portal: Permitted development for householders.
* Communities and Local Government: [http://www.communities.gov.uk/publications/planningandbuilding/developmentcertificates Lawful Development Certificates: A User's Guide].
* [https://www.gov.uk/government/consultations/greater-flexibilities-for-change-of-use Greater flexibilities for change of use: consultation].
* [http://www.publications.parliament.uk/pa/cm201314/cmhansrd/cm140224/debtext/140224-0004.htm#14022436000009 Hansard] 26 February 2014.

[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Legislation]] [[Category:DCN_Policy]] [[Category:DCN_Regulation]] [[Category:Planning_permission]]

Approved Document E

2024-07-07T16:15:18Z

Timbral Acoustic Consultants:

The first set of national building standards was introduced in 1965. Now known as the building regulations, they set out:

* What qualifies as 'building work' and so fall under the control of the regulations.
* What types of buildings are exempt.
* The notification procedures that must be followed when starting, carrying out, and completing building work.
* Requirements for specific aspects of building design and construction.

The 'approved documents' provide guidance for how the building regulations can be satisfied in common building situations. There is no obligation to adopt the solutions presented in the approved documents, the building regulations can be satisfied in other ways.

[https://www.gov.uk/government/publications/resistance-to-sound-approved-document-e Approved Document E: Resistance to the passage of sound], was last published in 2015.

It deals with requirements for sound insulation in buildings, including both new dwellings and the conversion of buildings to form dwellings. It covers sound reduction between rooms for residential purposes and designated rooms in dwellings, and acoustic conditions for common areas in flats and schools.

The content of the Approved Document includes:

* Section 0: Performance standards.
* Section 1: Pre-completion testing – Provides guidance on an appropriate programme of sound insulation testing for a sample of properties. See Pre-completion sound testing.
* Section 2: Separating walls and associated flanking constructions for new buildings – Provides examples of wall types and their junction requirements.
* Section 3: Separating floors and associated flanking constructions for new buildings – Provides examples of floor types and their junction requirements.
* Section 4: Dwelling-houses and flats formed by material change of use – Includes guidance on work to existing construction, corridor walls and doors, wall, stair and floor treatments, junction requirements .
* Section 5: Internal walls and floors for new buildings – Includes guidance on doors, layout, and junction requirements
* Section 6: Rooms for residential purposes.
* Section 7: Reverberation in the common internal parts of buildings containing flats or rooms for residential purposes.
* Section 8: Acoustic conditions in schools.
* Annex A: Method for calculating mass per unit area.
* Annex B: Procedures for sound insulation testing.
* Annex C: Glossary.
* Annex D: References.
* Annex E: Design details.

= The Requirements of Approved Document E =

The 2003 edition of Approved Document E (ADE) (incorporating 2004, 2010, 2013 and 2015 amendments) contains four requirements.

=== Requirement E1 - Protection against soudn from other parts of the building and adjoining buildings ===

Requirement E1 is as follows,

"Dwelling-houses, flats and rooms for residential purposes shall be designed and constructed in such a way that they provide reasonable resistance to sound from other parts of the same building and from adjoining buildings."

In practice, ADE goes on to elaborate that compliance can be demonstrated by pre-completion sound insulation testing of separating walls and floors.

In purpose-built dwelling-houses and flats, separating walls and floors must achieve at least 45 dB DnT,w + Ctr in an airborne sound insulation test. Separating floors must also achieve at most 62 dB L'nT,w in an impact sound insulation test. In dwelling-houses and flats formed by a material change of use, the requirements at 43 dB DnT,w + Ctr and 64 dB L'nT,w respectively.

=== Requirement E2 - Protection against soudn within a dwelling-house etc. ===

"Dwelling-houses, flats and rooms for residential purposes shall be designed and constructed in such a way that:

a) internal walls between a bedroom or a room containing a water closet, and other rooms; and

b) internal floors

provide reasonable resistance to sound."

In practice, this requirement can be achieved by using walls with a minimum laboratory Weighted Sound Reduction Index of Rw 40 dB.

=== Requirement E3 - Reverberation in the common internal parts of buildings containing flats or rooms for residential purposes ===

"The common internal parts of buildings which contain flats or rooms for residential purposes shall be designed and constructed in such a way as to prevent more reverberation around the common parts than is reasonable."

The intention of this Requirement is to prevent reverberant noise build-up in common areas which open directly into dwellings, to mitigate the noise of occupants coming and going passing through neighbouring front doors.

=== Requirement E4 - Acoustic conditions in schools ===

"(1) Each room or other space in a school building shall be designed and constructed in such a way that it has the acoustic conditions and the insulation against disturbance by noise appropriate to its intended use.

(2) For the purposes of this Part - 'school' has the same meaning as in Section 4 of the Education Act 1995[4]; and 'school building' means any building forming a school of part of a school"

Detailed requirements to achieve compliance with Requirement E4 are contained in [https://www.gov.uk/government/publications/bb93-acoustic-design-of-schools-performance-standards Building Bulletin 93: Acoustic design of schools - performance standards].

== Guidance ==

Guidance on detailing to meet the requirements is presented in Approved Document E and Robust Details. Consider hiring an [https://www.timbral.co.uk/post/8-things-you-need-to-know-to-pass-part-e-sound-tests acoustic consultant] to provide bespoke advice tailored to individual project needs.

= Related articles on Designing Buildings Wiki =

* Airborne sound.
* Approved documents.
* Approved Document A.
* Building acoustics.
* Building Regulations.
* Decibel.
* Noise nuisance.
* Part E compliance.
* Pre-completion sound testing.
* Reverberation.
* Robust details certification scheme.
* Room acoustics.
* Sound absorption.
* Sound absorption coefficient.
* Sound frequency.
* Sound insulation in buildings.
* Sound insulation in dwellings: Part 1: An introduction (GG 83-1).
* Sound v noise.
* Structure-borne sound.

This article was last updated by [https://www.timbral.co.uk Timbral Acoustic Consultants] on 3 May 2024.

--[[User:Timbral_Acoustic_Consultants|Timbral Acoustic Consultants]] 16:35, 03 May 2024 (BST)

[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Standards_/_measurements]] [[Category:Design]]

Approved document o

2024-07-07T16:12:44Z

Timbral Acoustic Consultants:

= National building standards =

The first set of national building standards was introduced in 1965. The 'building regulations' establish standards that have to be achieved in the construction of buildings. They set out:

* What qualifies as ‘building work’ and so falls under the control of the regulations.
* What types of buildings are exempt.
* The notification procedures that must be followed when starting, carrying out, and completing building work.
* Requirements for specific aspects of building design and construction.

The 'approved documents' provide guidance for satisfying the requirements of the building regulations in common building situations.

= [https://www.gov.uk/government/publications/overheating-approved-document-o Approved Document O] =

[https://www.gov.uk/government/publications/overheating-approved-document-o Approved Document O] was published on 15 December 2021 as part of the government’s plans to deliver net zero. This approved document takes effect on 15 June 2022 for use in England. It does not apply to work subject to a building notice, full plans application or initial notice submitted before that date, provided the work for each building is started before 15 June 2023. Full detail of the transitional arrangements can be found in Circular Letter 01/2021 published on gov.uk.

== The requirements. ==

The Requirements of O1 Overheating mitigation

# 'Reasonable provision must be made in respect of a dwelling, institution or any other building containing one or more rooms for residential purposes, other than a room in a hotel (“residences”) to— (a) limit unwanted solar gains in summer; (b) provide an adequate means to remove heat from the indoor environment.
# In meeting the obligations in paragraph (1)— (a) account must be taken of the safety of any occupant, and their reasonable enjoyment of the residence; and (b) mechanical cooling may only be used where insufficient heat is capable of being removed from the indoor environment without it.

== The aims ==

The aims of the requirement is to protect the health and welfare of occupants of the building by reducing the occurrence of high indoor temperatures.

Compliance can be demonstrated by using one of the following methods:

* The simplified method for limiting solar gains and providing a means of removing excess heat, as set out in Section 1.
* The dynamic thermal modelling method, as set out in Section 2.

== The simplified method ==

The categorisation of residential buildings will be made according to their location and the inclusion or not of cross-ventilation, this is to limit unwanted summer solar gain and remove excess heat. Limiting solar gains needs to be achieved in this model by setting maximum glazed areas of the buildings, and of the most glazed room as well as providing shading for high-risk locations, the acceptable strategies for doing this are listed in the regulations as:

# Fixed shading devices, comprising any of the following: Shutters, external blinds, overhangs, awnings,
# Glazing design, involving any of the following solutions: Size, orientation, g-value, depth of the window reveal.
# Building design – for example, the placement of balconies.
# Shading provided by adjacent permanent buildings, structures or landscaping.

NOTE: The guidance states that although internal blinds and curtains as well as foliage, such as tree cover, can provide some reduction in solar gains, they should not be taken into account when considering whether the requirement has been met.

The removal of excess heat is to be achieved through cross ventilation approaches, which rely on the correct calculation of minimum free areas for windows and vents which is given, this guidance varies depending on the level of risk for assessed though the building's location The regulation lists the following means for

# Opening windows (the effectiveness of this method is improved by cross-ventilation).
# Ventilation louvres in external walls.
# A mechanical ventilation system.
# A mechanical cooling system

NOTE: A passive means of removing excess heat must be demonstrated as far is reasonably possible before mechanical cooling, and all approaches must also comply with the other relevant regulations, such as Document F for noise and maintenance. When considering opening lights and an increase in purge ventilation.

== The dynamic modelling method ==

To demonstrate compliance using the dynamic thermal modelling method, all of the following guidance should be followed.

* CIBSE’s TM59 methodology for predicting overheating risk.
* The limits on the use of CIBSE’s TM59 methodology set out in paragraphs 2.5 and 2.6.
* The acceptable strategies for reducing overheating risk in paragraphs 2.7 to 2.11.

Find out more at: [https://www.gov.uk/government/publications/overheating-approved-document-o https://www.gov.uk/government/publications/overheating-approved-document-o]

== Night-time noise requirements ==

Approved Document O mandates [https://www.timbral.co.uk/post/acoustics-vs-overheating maximum noise levels] at night during the overheating condition. The Association of Noise Consultants recommends that this requirement is only applied to bedrooms. The acoustics, ventilation and overheating designs should be co-ordinated with input from an acoustic consultant.

= Related articles on Designing Buildings =

* Approved documents.
* Approved inspector.
* Building control bodies.
* Building Regulations exemptions.
* Building Regulations.
* Competent person schemes.
* Licensing.
* Overheating.
* Planning permission.
* Solar gain.
* Statutory approvals.
* Statutory authorities.
* The Building Act.

[[Category:DCN_News]] [[Category:DCN_Regulation]] [[Category:DCN_Standard]] [[Category:News]] [[Category:Regulations]] [[Category:Standards_/_measurements]] [[Category:Sustainability]]

Approved Document E

2024-05-03T15:35:21Z

Timbral Acoustic Consultants:

The first set of national building standards was introduced in 1965. Now known as the building regulations, they set out:

* What qualifies as 'building work' and so fall under the control of the regulations.
* What types of buildings are exempt.
* The notification procedures that must be followed when starting, carrying out, and completing building work.
* Requirements for specific aspects of building design and construction.

The 'approved documents' provide guidance for how the building regulations can be satisfied in common building situations. There is no obligation to adopt the solutions presented in the approved documents, the building regulations can be satisfied in other ways.

[https://www.gov.uk/government/publications/resistance-to-sound-approved-document-e Approved Document E: Resistance to the passage of sound], was last published in 2015.

It deals with requirements for sound insulation in buildings, including both new dwellings and the conversion of buildings to form dwellings. It covers sound reduction between rooms for residential purposes and designated rooms in dwellings, and acoustic conditions for common areas in flats and schools.

The content of the Approved Document includes:

* Section 0: Performance standards.
* Section 1: Pre-completion testing – Provides guidance on an appropriate programme of sound insulation testing for a sample of properties. See Pre-completion sound testing.
* Section 2: Separating walls and associated flanking constructions for new buildings – Provides examples of wall types and their junction requirements.
* Section 3: Separating floors and associated flanking constructions for new buildings – Provides examples of floor types and their junction requirements.
* Section 4: Dwelling-houses and flats formed by material change of use – Includes guidance on work to existing construction, corridor walls and doors, wall, stair and floor treatments, junction requirements .
* Section 5: Internal walls and floors for new buildings – Includes guidance on doors, layout, and junction requirements
* Section 6: Rooms for residential purposes.
* Section 7: Reverberation in the common internal parts of buildings containing flats or rooms for residential purposes.
* Section 8: Acoustic conditions in schools.
* Annex A: Method for calculating mass per unit area.
* Annex B: Procedures for sound insulation testing.
* Annex C: Glossary.
* Annex D: References.
* Annex E: Design details.

= The Requirements of Approved Document E =

The 2003 edition of Approved Document E (ADE) (incorporating 2004, 2010, 2013 and 2015 amendments) contains four requirements.

=== Requirement E1 - Protection against soudn from other parts of the building and adjoining buildings ===

Requirement E1 is as follows,

"Dwelling-houses, flats and rooms for residential purposes shall be designed and constructed in such a way that they provide reasonable resistance to sound from other parts of the same building and from adjoining buildings."

In practice, ADE goes on to elaborate that compliance can be demonstrated by pre-completion sound insulation testing of separating walls and floors.

In purpose-built dwelling-houses and flats, separating walls and floors must achieve at least 45 dB DnT,w + Ctr in an airborne sound insulation test. Separating floors must also achieve at most 62 dB L'nT,w in an impact sound insulation test. In dwelling-houses and flats formed by a material change of use, the requirements at 43 dB DnT,w + Ctr and 64 dB L'nT,w respectively.

=== Requirement E2 - Protection against soudn within a dwelling-house etc. ===

"Dwelling-houses, flats and rooms for residential purposes shall be designed and constructed in such a way that:

a) internal walls between a bedroom or a room containing a water closet, and other rooms; and

b) internal floors

provide reasonable resistance to sound."

In practice, this requirement can be achieved by using walls with a minimum laboratory Weighted Sound Reduction Index of Rw 40 dB.

=== Requirement E3 - Reverberation in the common internal parts of buildings containing flats or rooms for residential purposes ===

"The common internal parts of buildings which contain flats or rooms for residential purposes shall be designed and constructed in such a way as to prevent more reverberation around the common parts than is reasonable."

The intention of this Requirement is to prevent reverberant noise build-up in common areas which open directly into dwellings, to mitigate the noise of occupants coming and going passing through neighbouring front doors.

=== Requirement E4 - Acoustic conditions in schools ===

"(1) Each room or other space in a school building shall be designed and constructed in such a way that it has the acoustic conditions and the insulation against disturbance by noise appropriate to its intended use.

(2) For the purposes of this Part - 'school' has the same meaning as in Section 4 of the Education Act 1995[4]; and 'school building' means any building forming a school of part of a school"

Detailed requirements to achieve compliance with Requirement E4 are contained in [https://www.gov.uk/government/publications/bb93-acoustic-design-of-schools-performance-standards Building Bulletin 93: Acoustic design of schools - performance standards].

= Related articles on Designing Buildings Wiki =

* Airborne sound.
* Approved documents.
* Approved Document A.
* Building acoustics.
* Building Regulations.
* Decibel.
* Noise nuisance.
* Part E compliance.
* Pre-completion sound testing.
* Reverberation.
* Robust details certification scheme.
* Room acoustics.
* Sound absorption.
* Sound absorption coefficient.
* Sound frequency.
* Sound insulation in buildings.
* Sound insulation in dwellings: Part 1: An introduction (GG 83-1).
* Sound v noise.
* Structure-borne sound.

This article was last updated by [https://www.timbral.co.uk Timbral Acoustic Consultants] on 3 May 2024.

--[[User:Timbral Acoustic Consultants|Timbral Acoustic Consultants]] 16:35, 03 May 2024 (BST)

[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Regulation]] [[Category:Regulations]] [[Category:Standards_/_measurements]] [[Category:Design]]