Table notes: This work includes forming a hole through the cavity wall or window glass. The costs below are for treatment that's a minimum width of one metre from the wall. Solution: excavate as much soil as is needed to ensure the ground level is at least 15cm below the damp-proof course. Problem: the existing damp-proof course is below ground level If you're yet not a Which? member, join Which? to gain instant access to all the damp proofing costs. Which? members can log in to see all the prices in the tables below, as well as findings from our damp investigation, which revealed bad practice from a number of specialist damp companies. To give a realistic idea of how much various treatments might cost you, we've provided prices for terraced, semi-detached and detached houses, as well as the costs for treating just one wall or one area. We've worked with the Royal Institution of Chartered Surveyors (RICS), which publishes average building work and repair costs, to bring you the average cost for a range of different damp treatments – from repairing a damp-proof course with silicone to laying an entirely new damp-proof membrane. ![]() ![]() Make sure you're prepared for the potential costs – and don't overpay for work – by reading our guide below. Here we look at typical damp treatment and damp proofing costs plus expert advice to make sure you don't end up spending more than you need to.ĭamp proofing costs can run into the thousands of pounds and be very disruptive, as the most extreme works significantly affect your home's structure. ![]() Repairing a damp problem can be expensive.
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