Damp Proofing Cost in 2021 | Damp Proofer | Checkatrade
On average damp proofing external walls costs £1,500. Injection damp proofing cost. One of the ways to damp proof your home is to inject a water-proof solution between the ground and your home foundations. On average, injection damp proofing costs £3,500. Chemical damp proofing cost.