Damp proofing costs vary widely depending on the type of damp, extent of the problem, and property type. This guide gives you realistic 2026 prices to help you budget and compare quotes.
Quick Reference: 2026 Prices
| Service | Price Range |
|---|---|
| Damp Survey | £150 - £300 |
| Rising Damp Treatment (terraced) | £1,500 - £2,500 |
| Rising Damp Treatment (semi-detached) | £2,500 - £4,000 |
| Rising Damp Treatment (detached) | £3,500 - £6,000+ |
| Penetrating Damp Repair | £300 - £2,500 |
| Condensation/Ventilation | £300 - £2,000 |
| Basement Waterproofing | £3,000 - £15,000 |
| Mould Removal | £150 - £1,500 |
Damp Survey Costs
A professional damp survey is the essential first step. Prices typically range from £150 for a basic survey to £300 for comprehensive surveys of larger properties.
Many companies, including us, offer free surveys with no obligation. This is worthwhile as it gets you professional diagnosis and a quote without commitment.
Rising Damp Treatment Costs
Rising damp treatment involves two main elements: DPC injection and replastering. Both are usually essential for a lasting solution.
DPC Injection
- Single skin wall (4.5"): £60 per linear metre
- Double skin wall (9"): £70 per linear metre
- Cavity wall: £80 per linear metre
- Thick solid wall (13.5"+): £90+ per linear metre
Replastering
- Standard height (to 1m): £45 per m²
- Extended height (to 1.5m): £50 per m²
- Full height: £55 per m²
Typical Total Costs
For a typical Essex property, expect:
- Terraced house: £1,500 - £2,500 (usually one or two walls)
- Semi-detached: £2,500 - £4,000 (multiple walls often affected)
- Detached: £3,500 - £6,000+ (potentially full perimeter)
What's Included?
Good quotes should include:
- • DPC injection with BBA-approved cream
- • Removal of salt-contaminated plaster
- • Application of specialist renovating plaster
- • All materials and labour
- • Waste removal
- • 20-year guarantee (insurance-backed)
Penetrating Damp Costs
Penetrating damp repair costs vary enormously depending on the cause:
- Repointing: £40-£60 per m²
- Render repairs: £50-£80 per m²
- Waterproofing treatment: £20-£35 per m²
- Gutter/downpipe repairs: £100-£300
- Window seal replacement: £50-£150 per window
Most penetrating damp repairs cost between £300 and £2,500, depending on the extent of work required.
Condensation & Ventilation Costs
Condensation solutions range from simple fan installations to whole-house ventilation systems:
- Extractor fan (bathroom/kitchen): £150-£400 installed
- PIV system: £500-£900 installed
- MVHR system: £2,000-£4,000 installed
PIV (Positive Input Ventilation) systems offer the best value for most homes with condensation problems.
Basement Waterproofing Costs
Basement and cellar waterproofing is typically the most expensive damp treatment due to the complexity involved:
- Cementitious tanking: £80-£120 per m²
- Cavity drain system: £150-£250 per m²
- Sump pump installation: £500-£1,500
Total costs for basement waterproofing typically range from £3,000 for a small cellar to £15,000+ for a large basement conversion project.
Mould Removal Costs
- Surface treatment only: £150-£400 per room
- Treatment + ventilation: £500-£1,200
- Full remediation: £1,500+ (includes addressing root cause)
Note: Treating mould without addressing the underlying moisture source is usually ineffective long-term.
What Affects the Price?
Factors That Increase Cost
- More walls affected
- Thicker walls (need more injection cream)
- Higher damp line (more replastering)
- Difficult access
- Period properties with original features
- Additional issues discovered during work
Factors That Might Reduce Cost
- Smaller area affected
- Easy access
- Simple wall construction
- No replastering required (rare)
Getting Value for Money
Do
- Get at least 2-3 quotes to compare
- Check what's included in each quote
- Ask about guarantees (length, insurance-backing)
- Check if the company is PCA registered
- Ask what products they use (BBA-approved?)
Don't
- Automatically choose the cheapest quote
- Accept vague quotes without itemised breakdown
- Pay large deposits upfront
- Accept pressure to decide immediately
- Ignore the need for replastering
Payment and Financing
Most damp proofing companies expect payment on completion. Some offer:
- Staged payments: Deposit + balance on completion
- Interest-free finance: Spread cost over 6-12 months
- Credit options: For larger projects
We offer interest-free payment plans for larger projects - ask during your survey if this would help.
Is It Worth the Cost?
Damp proofing is an investment in your property. Consider:
- Untreated damp causes increasing damage over time
- Damp can affect your health
- Damp issues affect property value
- Treatment comes with long-term guarantees
- Energy efficiency improves with dry walls