Damp Proofing Cost UK 2026: Rising Damp, Penetrating Damp, Tanking + Brand Pricing
UK damp proofing in 2026 costs £350-700 per affected wall for a chemical DPC injection, £1,800-3,500 for a full 3-bed semi DPC, and £100-200/m² for basement tanking. This guide uses verified Q2 2026 pricing from Property Care Association (PCA) registered specialists across 519 UK towns — by damp type, severity, brand and house type.
UK Damp Proofing Cost 2026: 30-Second Answer
UK damp proofing costs in Q2 2026 vary by damp type and severity. A chemical DPC injection treatment costs £350-700 per affected wall; a full 3-bed semi DPC averages £1,800-3,500 including replastering. Penetrating damp treatment runs £400-1,200 per affected area. Basement tanking is £100-200/m² for the waterproofing alone, plus £40-90/m² for replastering. Specialist damp surveys cost £200-500 from a PCA-qualified surveyor.
Most reputable damp proofing comes with a 20-30 year guarantee (Wykamol, Permagard, Newton, Triton are the four dominant UK brands). Insurance-backed PCA guarantees survive owner-change, so the work transfers to the next buyer.
Bottom line: a PCA-registered specialist's £250-500 survey almost always saves more than its cost — many "damp" call-outs turn out to be condensation, leaking gutters or salt deposits, not rising damp.
UK Damp Proofing Cost by Type in 2026
| Damp Type | Typical Cost UK 2026 | Treatment Time | Guarantee |
|---|---|---|---|
| Rising Damp (chemical DPC injection) | £350-700 per wall · £1,800-3,500 full 3-bed | 1-3 days | 20-30 years (PCA-backed) |
| Penetrating Damp (exterior treatment) | £400-1,200 per affected area | 1-3 days | 10-20 years |
| Condensation Treatment (PIV + vents) | £300-900 | 1 day | 5-10 years (system) |
| Basement Tanking (cementitious or membrane) | £100-200/m² (waterproofing only) | 5-15 days | 25-50 years (BS 8102) |
| Full Basement Waterproofing + Conversion | £15,000-40,000 | 6-12 weeks | 25-50 years (BS 8102 Type C) |
| Wet Rot Treatment | £200-800 per timber section | 1-3 days | 10-20 years |
| Dry Rot Treatment (specialist) | £800-3,500 per affected area | 3-10 days | 20-30 years |
Source: PCA-registered specialist Q2 2026 quotes across 519 UK towns + manufacturer guarantee terms. London + South-East add 20-30%.
UK Damp Proofing Brands 2026: Wykamol vs Permagard vs Newton vs Triton
The UK damp treatment market is dominated by four brands. PCA-registered specialists typically work with one or two — choice matters because the guarantee attaches to the chemical product, not the contractor.
| Brand | Speciality | Trade Price (DPC cream, 1L) | Guarantee |
|---|---|---|---|
| Wykamol | Full DPC + waterproofing + timber | £28-42 | 20-30 years |
| Permagard | DPC + waterproofing | £24-38 | 20-30 years |
| Newton Waterproofing | Basement tanking + membrane (BS 8102 Type C) | £35-65/m² (membrane) | 30 years |
| Triton Chemicals | DPC + masonry treatments | £26-40 | 20-25 years |
| Kingspan / Aqualux | Insulation + tanking | Variable | 25 years |
Insurance-backed guarantees (GPI) cost an extra £150-300 — strongly recommended for any work over £1,500.
Full DPC Cost by UK House Type in 2026
| Property | Linear Metres | DPC Cost | + Replaster | Total + Survey |
|---|---|---|---|---|
| 2-bed mid-terrace | 18-25 m | £1,200-2,200 | £900-1,800 | £2,400-4,400 |
| 3-bed semi (typical UK) | 25-35 m | £1,800-3,500 | £1,200-2,800 | £3,300-6,700 |
| 4-bed detached | 35-50 m | £2,800-5,500 | £1,800-4,200 | £4,800-10,000 |
| Victorian terrace (period) | 25-40 m | £2,200-4,500 | £1,500-3,500 (lime +£800-1,800) | £3,900-8,200 |
Damp survey £200-500 from PCA-qualified surveyor. Replastering after DPC injection is mandatory — old plaster is salt-contaminated.
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UK Damp Proofing FAQ · 2026
UK damp proofing Q2 2026: chemical DPC injection £350-700/wall. Full 3-bed semi DPC £1,800-3,500 + £1,200-2,800 replastering. Penetrating damp £400-1,200. Basement tanking £100-200/m². Survey £200-500. London/SE +20-30%.
PCA-qualified damp survey £200-500 in 2026 UK. Moisture-meter readings, salts test, written report. Often essential — many damp call-outs turn out to be condensation/leaking gutters/salt deposits, not rising damp.
Rising damp moves up walls via capillary action (1m tide-mark, salt). Treat: chemical DPC. Penetrating enters horizontally (failed pointing, blocked gutters). Treat: fix external + repoint. Condensation is interior moisture (showers, cooking, breathing) — treat: PIV + vents + extract fans. ~70% of UK damp call-outs are actually condensation.
Basement tanking (waterproofing-only) £100-200/m² cementitious or £120-180/m² Type C cavity drain membrane. Typical 25 m² basement £2,500-5,000. Full basement waterproofing + conversion £15,000-40,000+. Newton Waterproofing dominates UK Type C market.
Modern chemical DPC (Wykamol Ultracure, Permagard, Triton TR60) lasts 20-30 years. Most PCA-registered installers offer 20-30 year guarantee, often GPI insurance-backed. Salt-resistant replastering critical.
Comparable chemistry. Wykamol UK market leader, biggest installer network, best-known guarantee scheme. Permagard cheaper trade rates (£24-38 vs £28-42/litre), broader DIY range. Newton dominates basement tanking; Triton for period buildings.
Rarely. Most UK home insurance excludes rising damp + condensation (classed as gradual deterioration). Penetrating may be covered if from insurable event (storm, burst pipe). PCA guarantees are NOT home insurance — only contractor-failure backstop.
Yes both ways. Visible damp sells 5-15% below comparable; lenders refuse mortgages on visibly damp without survey. PCA-registered work with 20-30 year insured guarantee is positive at sale. Keep original guarantee paperwork.
Where Our 2026 Damp Proofing Data Comes From
- Property Care Association (PCA) — UK damp + timber Q2 2026 pricing
- BS 8102:2022 — basement waterproofing standards
- RICS Damp + Timber Inspection Q2 2026
- NHBC Standards 2026 — DPC + waterproofing requirements
- Wykamol Group — installer network + guarantee scheme
- Permagard Products — trade pricing + GPI
- Newton Waterproofing — Specialist Contractor Network
- Triton Chemicals — Approved Damp Specialist scheme
All cost ranges reflect quotes from PCA-registered specialists in Q2 2026 across 519 UK towns. Editorial standards: /editorial-standards.