Energy performance certificate EPC
On 9 January 2013, the Energy Performance of Buildings (England and Wales) Regulations 2012 took effect. The regulations require that energy performance certificates (EPC's) are produced for certain dwellings and non dwellings.
Energy performance certificates (EPC's), set out the energy efficiency rating of buildings. They are required when buildings are built, sold or rented, if they have a roof and walls and use energy to condition an indoor climate. If a building contains separate units (for example a block of flats), each unit needs an EPC, but they are not required for shared bedsit type accommodation.
Buildings that do not need an energy performance certificate include:
- Places of worship.
- Temporary buildings.
- Stand-alone buildings with a floor area of less than 50 square metres.
- Industrial and agricultural buildings with low energy requirements.
- Protected buildings, where compliance with energy efficiency requirements would unacceptably alter their character or appearance.
- Rented dwellings that continue to be occupied by the same tenant since before 1 October 2008.
- Buildings that are suitable for demolition.
Buildings are rated from A to G on EPC's, with A representing a very efficient building and G a very inefficient building.
EPC's are provided by accredited energy assessors who also provide a recommendation report to help owners and occupiers make their building more energy efficient, and may identify recommendations that could be eligible for Green Deal financing. Currently, there is no requirement to follow the recommendations, however, the Energy Act 2011 stipulates that from 2018 it will be illegal to let buildings that do not meet minimum energy performance standards. See Minimum energy efficiency standard regulations for domestic and non-domestic buildings for more information.
EPC's are valid for 10 years. They must be made available free of charge to prospective buyers or tenants at the earliest opportunity, and where EPC's are available, adverts must show the energy rating of a building (although it is no longer necessary to attach the front page of the EPC to written material).
For commercial buildings larger than 500 square metres that are frequently visited by the public, an EPC must be displayed if one is available.
For new buildings, obtaining an EPC is the responsibility of the person carrying out the construction.
EPC's can be generated using the Simplified Building Energy Model, or other Approved Dynamic Simulation Models (DSMs).
Research has shown that EPC's may not accurately reflect the actual energy use of buildings. For example, research presented at the COBRA 2012 conference suggested that "...in low labelled dwellings the energy use is less than expected, in the high labelled dwellings the energy use is somewhat higher than expected" (ref RICS: Effectiveness of EPC for the Existing Housing Stock).
In addition, a 2012 report by Jones Lang LaSalle and the Better Buildings Partnership, that studied more than 200 buildings, found that "...EPCs alone are not sufficient in delivering the Government's decarbonisation targets nor are they capable of accurately portraying a building's true energy efficiency" (ref Jones Lang LaSalle: A Tale of Two buildings. Are EPCs a true indicator of energy efficiency?)
 Related articles on Designing Buildings Wiki
- Air tightness.
- Building performance metrics.
- CRC Energy Efficiency Scheme.
- Display energy certificate.
- Emission rates.
- Energy Act.
- Energy certificates for buildings.
- Energy Performance of Buildings Directive.
- Energy related products regulations.
- Energy Savings Opportunity Scheme.
- Energy targets.
- Green Deal.
- Home information pack HIP.
- Homebuyer Report.
- Listed buildings.
- Minimum energy efficiency standard regulations for domestic and non-domestic buildings.
- National Calculation Method.
- Performance gap.
- Simplified Building Energy Model.
- U-value conventions in practice: Worked examples using BR 443.
- Zero carbon homes.
- Zero carbon non-domestic buildings.
 External references
- Legislation: Energy Performance of Buildings (England and Wales).
- Department for Communities and Local Government: A guide to energy performance certificates for the construction, sale and let of non-dwellings.
- Department for Communities and Local Government: A guide to energy performance certificates for the construction, sale and let of dwellings.
- Department for Communities and Local Government: A guide to display energy certificates and advisory reports for public buildings.
- Department for Communities and Local Government: A guide to air conditioning inspections for buildings.
- Department for Communities and Local Government: Local weights and measures authority guidance for energy performance certificates and air conditioning inspections for buildings.
- Department for Communities and Local Government: Recast of the Energy Performance of Buildings Directive - impact assessment.
- Guild of residential landlords: Changes to EPC Regulations 2013.
- RICS: Effectiveness of EPC for the Existing Housing Stock. September 2012.
- Jones Lang LaSalle: A Tale of Two buildings. Are EPCs a true indicator of energy efficiency? 2012.
Featured articles and news
There were over 1,400 new articles added to Designing Buildings Wiki in 2016. Here are the top 15 most popular.
MVRDV reveal designs for a strange holiday villa in Taiwan.
New milestone achieved with launch of new safety lanyard for working from height.
A quick introductory article about preliminaries in construction.
Brandenburg Gate - an historic structure that went from symbolising German partition to European unity.
A discussion between construction key players and leading insurers on the future outlook for construction insurance.
New guide from BSRIA on building performance evaluation in domestic buildings.
Rogers Stirk Harbour and Partners complete new trio of towers at Sydney Harbour.
With a new government consultation underway, ICE look at creating a smarter, more flexible energy system.
British Antarctic Survey announces research station is to relocate 23km due to growing crack in the ice shelf.
A great example of mimetic architecture with the Fish Building of India.