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The clients used our services for construction management. A large and deep sewer pipe in the vicinity of the site created major digging work as we needed to lay the foundations 3 metres below ground level because piling foundations were ruled out by the local authorities. Trenches of this depth within a narrow site like this one represented major added cost for a small dwelling. However, we were aware of this problem from the design stage and the clients were informed about this issue long before construction started. The dwelling was insulated as a class B2 for energy rating but no renewable energy source was installed. However, thanks to the under-floor heating system, the clients have the option to replace easily their existing gas boiler by an air/water heat pump, if they are interested to do so in the future.