A number of lessons can be drawn from case studies. Firstly,it is clear that Code compliance can be achieved using a wide range of build systems. The Code can also be used on a wide range of building types, from flats/apartments through to large, detached dwellings. Furthermore, the Code can be a valuable tool for any type of project,whether private or social housing, and covering rental, affordable and private sale properties.
However, it has taken time for those involved to become familiar with the assessment and certification process, which has led to uncertainty, increased costs, and delays in completion of certification.
In more technical terms there are a number of common lessons about how best to achieve code compliance:
• A high-quality, highly insulated building shell that has low air-permeability and makes best use of passive solutions seems to be the most successful and straightforward approach
• Code design criteria should be incorporated from the earliest design phases of a project in order to understand the overall design implications
• A Code assessor should be included in the project plans from the outset
• The build systems and the design approach should be integrated from the earliest design phases
• Renewable energy technologies should be integrated into the overall design concept from the earliest design phases
• Success depends on a dedicated and skilled construction team with a strong commitment to sustainability, who bring goodwill and innovation to the use of new systems.
And, finally, it seems that there is a cost premium associated with achieving Code requirements, currently estimated at about 15% including training costs which should reduce on future projects. Equally, the sustainability performance of Code homes may generate a value premium, possibly about 10%, although this needs further investigation and verification.
