Commercial – Non Dwellings
Every non-dwelling is required to be tested, with some exceptions:
- Buildings under 500m2 (gross floor area) may wish to accept a poor default value of 15m3/h/m2. (There will be a cost somewhere else in the process to pay for this trade off)
- Factory made modular buildings may prove their performance using an independent approved test body to conduct test programmes both in the factory and on site.
- Large and / or complex buildings will sometimes find it impossible to test and will therefore need to engage an idependent person to undertake a detailed programme of design development, component testing and site supervision to provide the necessary confidence.
All extensions to existing non-dwellings are treated as for new build, providing they are:
- Greater than 100m2 (gross floor area)
- Greater than 25% of the total useful floor area.