As-built performance
The final stage impact assessment of the Future Buildings Standard. Secondary legislation, statutory guidance published by MHCLG 24 March, 2026 defines as-built performance as being "The actual energy performance of a building once it has been constructed and commissioned, which may differ from performance estimated at the design stage."
The term is also used to describe complete drawings of a finished buildings, though the intention of these is similar and at a similar stage the content and outcome is different. See article as-built drawings and record drawings.
For further information and details from the perspective of performance see performance gap between building design and operation, closing the gap between design and as-built performance, post occupancy evaluation., building use studies (BUS), building performance evaluation, performance in use and more.
[edit] Related articles on Designing Buildings
- Appointing consultants.
- As-built drawings and record drawings.
- Building performance evaluation.
- Building performance metrics.
- Closing the gap between design and as-built performance.
- Energy audit.
- Maintenance.
- Performance of exemplar buildings in use: Bridging the performance gap FB 78.
- Performance in use.
- Post occupancy evaluation.
- Post occupancy evaluation process.
- Sick building syndrome.
- Thermal comfort.
- Wellbeing.
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
Communities will be able to build their own clean energy.
Why diversity and inclusion matters for SMEs
CIOB’s D&I Charter shows how practical changes can support long-term growth.
Cut electricity bills to power growth
Coalition sends joint letter to the Chancellor.
Gasholders: a history in pictures. Book review.
Recognition, influence and growth
SocEnv identifies three strategic pillars in new strategy to 2045.
Discover the future of roofing, cladding and insulation.
New guidance for professional practice, cultural change and regulation in social housing.
The heritage of nuclear and conventional power stations.
New measures to stop people being ripped off
Government to protect families from cowboy builders and aggressive bailiffs.
New Futurebuild showcase brings an innovation-first approach.
National Planning Policy Framework
Understanding the 2026 changes.
ECA's public affairs priorities
Member consultation opens to shape priorities for 2027 to 2030.