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Drainage: the boring detail that decides your extension’s location

by admin | Dec 17, 2025 | Homeowners

Foul and surface water drainage runs determine where an extension can be built without significant additional cost. Building over an existing run requires Build Over consent from the water authority and can constrain foundation design. Diverting runs is possible but...

Drainage runs, wall thicknesses and other things plans don’t show you

by admin | Jul 3, 2025 | Quantity Surveying

Existing drainage runs are rarely accurately recorded. Cavity wall build-ups vary across periods and even across the same property. Floor build-ups can hide unexpected steps. None of these things show up on a measured survey unless someone has gone looking.Our site...

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