Whilst so much work goes into calculating the required U-values (thermal transmittance of construction elements) and predicted energy performance at the design stage, this is rarely checked at the post construction stage. Many projects have a ‘performance gap’, which is the different between design stage and as-built performance. Understanding the extent of this gap is vital to providing feedback and recommendations for future projects.

Undertaking an as-built energy and fabric assessment comprises two stages of evaluation, pre- and post-occupation:


  • Thermal imaging
  • Heat flux testing
  • Co-heating assessment
  • Air tightness testing

Post occupation

  • Monitoring dwelling energy consumption

Feedback is provided to aid the design of upcoming projects and phases, to optimise performance and avoid over- or under-specification.

Building Performance Evaluation allows for an analysis of the construction quality of buildings. The information gathered can be used to optimise operational performance, undertake remediation measures where necessary and feedback lessons learnt to future projects. It can be used to demonstrate build quality and to improve performance.