What a damp survey covers
Carried out by a CSRT or CSSW-qualified surveyor (Certified Surveyor in Remedial Treatment or Construction in Structural Waterproofing). Covers: rising damp identification using calcium carbide meter or salts analysis, penetrating damp from external wall defects or roof leaks, condensation from ventilation and thermal bridging, mould growth and air quality. Output: written report with photographs, moisture readings at floor and wall samples, treatment specification with budget cost. Cost £150–£400 depending on property size. Useful for: pre-purchase due diligence, ongoing moisture issues, mortgage requirements, insurance claims.
What a structural survey covers
Carried out by a chartered structural engineer (MICE, MIStructE, CEng). Covers: foundation type and condition (strip, raft, piled), load-bearing wall identification, beam and lintel assessment, roof structure evaluation, settlement and movement assessment, suitability for proposed extension, structural calculations for any new openings. Output: written report with structural recommendations, design drawings if required, calculations to Building Regulations Part A standard. Cost £600–£1,800 depending on scope and property complexity. Required for: any extension involving new openings, removal of chimneybreasts, basement excavation, loft conversion structural design.
When you need both
Almost every London Victorian or Edwardian renovation needs both surveys. A side-return kitchen extension needs structural design (new RSJ openings, foundation interface, lintel sizing) plus damp investigation (lime plaster vs modern render compatibility, DPC continuity, ground floor moisture). A whole-house refurbishment needs structural (any wall removals, loft conversion suitability) plus damp (rising damp treatment, breathable wall buildup specification). Commissioning both at design stage avoids surprises at contractor pricing and reduces variation costs during the build.
