Assured Performance Process

Assured Performance Process

All too often, the actual energy performance of new homes fails to meet their design standards. Despite the efforts planners, developers and building designers put into achieving efficient energy use, occupied homes typically use at least twice as much energy as predicted. How can you ensure that your developments achieve your design standards and provide your customers with the performance they expect?

Assured Performance Process - mitigate performance risk and protect your reputation










Our Assured Performance Process (APP) maps to the RIBA Plan of Work and has five stages of expert, impartial review and assessment. The APP process means that energy and low-carbon aspirations in the brief and planning stages translate into executable designs that deliver as they were intended.

It also ensures that the designs are implemented faithfully on site, thereby eliminating discrepencies that undermine energy performance when a home is handed over.


Inception and strategy

At the early stage of design, there might be no more than a site plan and some sketches. But this is the prime opportunity to fine-tune the orientation, massing, and glazing ratios. It is also when any low-carbon technologies are chosen (or ruled out). Therefore, this is a critical time to intervene, but there are so many options it can be hard to see the wood for the trees. We can help you.

Planning and early design

Detailing junctions, rainwater goods and insulation (and the choice of energy systems) all shape the energy use profile of a home for years to come. Poor decisions at this stage might not be obvious and might not surface until much later in the programme, when it's difficult and costly to undo and correct them. We can help spot them early.

Detailed design

In a typical house, there are around 1,000 components affecting energy performance. The detail matters, and no-one has time to scrutinise all the components and how they come together in the design, especially when the developer and builder are anxious to start on site. We can do this for you.


The difficulties of site work and the rush to complete homes fast means short-cuts are commonplace, but not always visible. Airtightness and insulation are especially vulnerable. Energy systems are also often either not commissioned correctly or installed in ways that undermine performance. We can see it through.

Verification and assessment

Testing on completion and evaluating how occupants interact with their buildings (post-occupancy evaluation) closes the feedback loop enabling designers, builders and specifiers to learn from the experience. Ideally, this should be linked to energy monitoring, comparing actual energy use against the design targets during the early life of the building. We can support you.

Benefits of our Assured Performance Process

  • Lower energy demand and lower carbon emissions from every home.
  • More confidence that homes will meet their predicted design standards.
  • Improved comfort and satisfaction of residents.
  • Certainty of delivering high-quality homes without spending lots of time policing each stage.
  • More sustainable buildings without the box-ticking of the old Code for Sustainable Homes.
  • Reassurance for stakeholders that action is being taken without firm policy from central government.

Further Information

For more information on Assured Performance Process, please visit our site:

Related case studies

Assured Performance Process

East Hampshire District Council - Quebec Park

Quebec Park in Bordon, East Hampshire, is a medium-size development of two, three and four-bedroom homes on the site of the old Quebec Barracks. We used our Assured Performance Process to review each house type planned for the site - at key stages of their design - and to identify a range of risks and recommendations.