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.
Confronting competency, codes, capacity and costs.
The hidden risk in modern construction supply chains.
Construction Management, 10 June
24 months to 14: CITB launches accelerated apprenticeships.
Bridging the gap between clients and contractors
Concerns remain around contractor quality, capability, and delivery.
Construction Management, 10 June.
Heat pumps beat boilers in new home tests.
Building Safety Act implementation in Wales
CIAT to host industry panel on 26 June.
New and updated CLC building safety guidance.
New UK National Buildings Database.
Building Safety Wiki Interviews
Chief executive of the British Woodworking Federation.
Planning condition discharge in England and Wales
A brief explanation from a building compliance expert, with further links.
Overheating guidance and tools for building designers
Guidance for dealing with element of building fabric control that have increasing importance.