- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 29 Jan 2018
...the particular group allocated to each dwelling on a development to provide the basis for assessing the pressure testing regime. The allocation of each dwelling to a dwelling type should be the responsibility of the person carrying out the pressure testing. To be classed as of the same type, dwellings should:
- Be of the same generic form (i.e. detached, semi-detached, end terrace, mid-terrace, ground floor flat (including ground-floor maisonette), mid-floor flat, top-floor flat (including top-floor maisonette).
- Include the same number of storeys.
- Have the same design air permeability.
- Have similar adjacency to unheated spaces such as stairwells, integral garages etc.
- Have the same principal construction details.
- Have a similar (i.e. +1) number of significant penetrations, i.e. for windows, doors, flues/chimneys, Supply/exhaust terminals, waste water pipes.
- Have envelope areas that do not differ by more than 10 per cent.
- Category 1 – Visitable dwellings.
- Category 2 – Accessible and adaptable dwellings.
- Category 3 – Wheelchair user dwellings.
 Find out more
 Related articles on Designing Buildings Wiki
- Air permeability.
- Air permeability testing.
- Air tightness in buildings.
- Approved documents.
- Building emission rate.
- Dwelling emission rate.
- Energy performance certificates.
- Standard assessment procedure.
- Target emission rate.
- The history of non-domestic air tightness testing.
- Types of dwelling in approved document m.
Featured articles and news
Proactive measures to secure property during extreme times.
Safety guidance from BSI released; comments requested.
Scour can make river currents structurally damaging.
Indoor environmental quality looks at air quality and other wellbeing factors.
A procurement method associated with Public Private Partnerships.
Infrastructure can use digital technology to encourage human growth.
Robotics and the construction industry.
ECA comments on CLC's three-phase recovery plan.
Their diplomatic and architectural history.
The origins of the six volume series.
Built to defend British waters, only to serve as pirate radio stations later.
Wellbeing to influence mix of home and office based working.
An introduction to cobotics.
Survey reports on outlook for the engineering sector.
A simple path to possible error avoidance.
Construction + technology = ConTech.