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Survey, treatment and re-plastering — the 2026 trade-price reference for an average UK home.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Top tips
Hiring a damp proofer, without the regret.
Four moves that separate a smooth job from a nightmare.
Free surveys overselling treatment
Free contractor surveys recommend significant work even when not needed. Always pay for independent diagnosis (£120–£400).
Lifetime guarantees from new contractors
Worthless if the contractor goes bust. Insist on insurance-backed.
Chemical injection on misdiagnosed damp
Treating non-rising damp wastes thousands. 80% of "rising damp" is actually condensation or penetrating.
Wide quote variation
Get 3 PCA-qualified quotes. Outliers (much cheaper or expensive) need investigation.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Damp survey (PCA-qualified)Independent
£120–£400
Chemical DPC injection per metreDryzone, Aquapol
£50–£120
Rising damp treatment whole wallInternal + external
£800–£2.5k
Whole-house rising damp treatment4-bed terrace
£2.5k–£8.5k
Penetrating damp source repairFind and fix source
£400–£3.5k
Mould treatment per areaBiocide + redecoration
£40–£250
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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UK damp proofing prices vary wildly — and inflated quotes are common. This reference helps you spot fair pricing and avoid being overcharged. All prices include VAT and are based on PCA-qualified contractors for 2026.
What Does the Work Involve?
This is a pricing reference — see individual guides for full process. Prices assume PCA-qualified diagnosis, brand-name products (Dryzone, Aquapol, Newton, Delta, Vandex, Sika), insurance-backed guarantees, and quality contractors. London/SE typically 15–25% above national average.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Damp survey (PCA-qualified) | 120 | 400 | Independent |
| Chemical DPC injection per metre | 50 | 120 | Dryzone, Aquapol |
| Rising damp treatment whole wall | 800 | 2,500 | Internal + external |
| Whole-house rising damp treatment | 2,500 | 8,500 | 4-bed terrace |
| Penetrating damp source repair | 400 | 3,500 | Find and fix source |
| Mould treatment per area | 40 | 250 | Biocide + redecoration |
| Bathroom extractor (humidistat) | 150 | 400 | Vent-Axia, Greenwood |
| PIV (positive input ventilation) | 500 | 1,200 | Whole-house |
| MVHR full system | 2,500 | 6,500 | Premium, whole-house |
| Salt-resistant re-plastering per m² | 50 | 120 | Limelite, Sika |
| Type A tanking per m² | 40 | 100 | Cellar waterproofing |
| Type C cavity drain per m² | 80 | 180 | Premium basement system |
| Internal wall insulation per m² | 40 | 120 | Solid wall retrofit |
| Cellar conversion habitable | 15,000 | 60,000 | Including waterproofing |
How Long Does It Take?
Survey: 1–2 hours visit, 2–5 working days for report. Standard treatment: 1–2 weeks plus 4–8 weeks drying. Basement waterproofing: 2–4 weeks plus drying. Cellar conversion: 6–20 weeks.
DIY or Professional?
PCA-qualified diagnosis essential. Treatment by PCA-affiliated contractor for warranty validity.
Choosing the Right Tradesperson
PCA member. Independent surveyor (not contractor doing remedial). 20–30 year insurance-backed guarantee for major work. Get 3 quotes for like-for-like spec. Verify Property Care Association membership.
UK Regulations
PCA Code of Practice. BS 8102 for waterproofing. Awaab's Law for landlord obligations. Building Regs Part C for moisture. Listed building consent for heritage.
Common Problems With Quotes
- Free surveys overselling treatment: Free contractor surveys recommend significant work even when not needed. Always pay for independent diagnosis (£120–£400).
- Lifetime guarantees from new contractors: Worthless if the contractor goes bust. Insist on insurance-backed.
- Chemical injection on misdiagnosed damp: Treating non-rising damp wastes thousands. 80% of "rising damp" is actually condensation or penetrating.
- Wide quote variation: Get 3 PCA-qualified quotes. Outliers (much cheaper or expensive) need investigation.
Frequently Asked Questions
How much should damp treatment cost in 2026?
Single wall: £800–£2,500. Whole-house rising damp: £2,500–£8,500. Cellar waterproofing: £4,500–£18,000. Survey and diagnosis: £120–£400.
Why are quotes so different?
Diagnosis quality (PCA-qualified vs sales), brand of products, contractor accreditation, warranty length, region. London 15–25% above national.
What payment structure is normal?
25% deposit on order. Balance staged on completion of milestones. Avoid 50%+ deposits. Insurance-backed guarantee should be included or itemised.
Will my buildings insurance pay for damp?
Generally no — damp is a maintenance issue, not insured peril. Exception: damage from sudden leak (e.g. burst pipe) may be covered.
Awaab's Law — what does it mean for landlords?
Landlords must address damp/mould within strict timeframes from 2026 (typically 7–14 days for serious cases). Failure can result in fines and tenant compensation.
Should I use a free survey?
No — free surveys are sales tools. Pay £120–£400 for independent PCA-qualified surveyor. Saves £000s on misdiagnosed treatment.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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