How to Build your extension

This section introduces you to the different stages of construction, how to manage the process, and some pitfalls to avoid.


Different ground conditions require differently engineered foundations and foundation design. Likewise frost and groundwater need special consideration, especially for Cellars and Basements. Avoid some early pitfalls and get your foundations right first time.


You now have to regard all aspects of water – rainwater, surface water, sustainable urban drainage, sewage, grey water, recycling water, and so on – as a sustainable resource. Avoid possible pitfalls in the design of your building now..

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