Damp Proofing Specialists in South East London
Damp ruins walls, damages health, and knocks thousands off your property value.
All Well Property Services provides professional damp proofing across South East London. Prices range from £1,500to £8,000. Typical build time: 1–2 weeks. All projects include a fixed-price contract, single project manager, and full Building Control sign-off. Call 020 3920 9617 for a free consultation.
What We Offer
Damp ruins walls, damages health, and knocks thousands off your property value. We diagnose the cause — rising damp, penetrating damp, or condensation — and fix it with guaranteed treatments that last.
- ✓Rising damp treatment
- ✓Penetrating damp solutions
- ✓Condensation management
- ✓Damp surveys and diagnosis
- ✓Chemical DPC injection
- ✓Tanking and waterproofing
- ✓Replastering after treatment
- ✓Long-term guarantee included
Typical Investment
1–2 weeks | Fixed-price contracts
Single wall DPC injection
Chemical damp-proof course, one wall
£1,500 – £3,000
Full ground floor DPC
All external walls treated
£3,000 – £6,000
Basement tanking
Full waterproof membrane system
£5,000 – £12,000
Most clients with rising damp in a Victorian terrace typically invest between £2,500 and £4,500 for a full DPC treatment with replastering.
Fixed-price contracts | No hidden costs | 1–2 week typical build
What Affects the Cost?
- •Type of damp (rising, penetrating, or condensation)
- •Number of walls and area affected
- •Whether replastering is needed after treatment
- •Basement tanking vs DPC injection
- •Access to external walls
Our damp-proofing experience
Damp problems are common in pre-1930 London housing stock where original slate damp-proof courses have failed over time. Since 2020 we have run damp-proofing projects across South London. Project mix covers chemical DPC injection plus replastering on rising damp, penetrating damp repairs (cracked render, blocked downpipes, failing pointing), condensation management (PIV ventilation systems, extractor fans), and basement tanking with waterproof membrane systems. The boroughs we work in most often for damp work: Anerley, Penge, Crystal Palace, Catford, Lewisham, Bromley, Camberwell, Forest Hill, Sydenham. The lower-lying streets in these boroughs (often near rivers like the Quaggy, Ravensbourne, or the Tyburn-Effra system) have higher persistent groundwater than the higher ground, which makes rising damp more aggressive when the original DPC fails.
Standards and certifications for damp work
Chemical DPC injection follows the established Code of Practice for diagnosis of rising damp and installation of chemical damp-proof courses. We use silicone-based DPC creams from Permagard or similar BSI-approved suppliers. Injection holes are 12mm diameter at 100-120mm centres, drilled into the mortar course at the appropriate height (typically 150mm above ground level externally, or 75mm above floor level internally). Diagnosis comes first. We carry calibrated moisture meters (Protimeter or Tramex) and confirm the diagnosis at the survey before quoting. Rising damp, penetrating damp, and condensation each have different signatures and need different treatments. The most common mistake in damp work is treating the wrong cause — we don't. Replastering uses salt-resistant render (Limelite or Tarmac salt-resistant base coat) applied to the affected wall after a 4-6 week drying period. Rushing the replaster onto a wall that's still damp causes the same problem to return within 6-12 months. All DPC work is guaranteed for 20 years against re-occurrence in the treated walls. The guarantee is transferable to subsequent owners. We carry CHAS certification, Public Liability insurance to £5 million, and Asbestos Awareness training (relevant for stripping out old artex or textured ceilings during damp repair).
How we deliver damp-proofing projects
Diagnosis first. The survey includes calibrated moisture meter readings on every affected wall, external inspection of gutters and downpipes, and assessment of internal ventilation. We don't quote a treatment without confirming the cause. Fixed-price contracts. After the survey we issue a fixed-price quote covering DPC injection, drying period, replastering with salt-resistant render, and final decoration where included. The price doesn't change unless the underlying cause turns out to be different from the initial diagnosis (rare — typically because moisture meters at the survey were inconclusive). Proper drying. Walls need 4-6 weeks to dry out after DPC injection before replastering. We schedule a return visit to check moisture levels with the calibrated meter before applying the final plaster coat. Rushing the drying creates problems that show up six months later. 20-year transferable guarantee on all DPC work. We provide a guarantee certificate at handover suitable for solicitor enquiries at sale time. We operate from Unit 1 Limes Avenue, Anerley, London SE20 8QR. Companies House number 12721034. 57 verified Google reviews averaging 4.5 out of 5 stars.
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Recent Damp Proofing Projects
Damp Proofing across South East London
What Our Customers Say
“All Well managed our project from start to finish. The fixed-price contract meant no surprises, and the result is stunning.”
Verified Customer
“Professional team, clean site, and they handled all the paperwork. Would recommend to anyone.”
Verified Customer
“Great communication throughout. They kept to the timeline and budget exactly as quoted.”
Verified Customer
Accredited & Certified
Frequently Asked Questions
- What are the different types of damp?
- The three main types of damp in London properties are rising damp, penetrating damp, and condensation. Rising damp occurs when groundwater travels upward through walls by capillary action, usually because the original damp-proof course has failed or was never installed — common in Victorian and Edwardian terraces built before 1920 across boroughs like Lewisham, Southwark, and Greenwich. It typically shows as a tide mark up to 1 metre high with salt deposits (efflorescence) and blown plaster. Penetrating damp enters through external walls, roofs, or around windows due to failed pointing, cracked render, or damaged flashings — we see this frequently in exposed south-west facing elevations. Condensation is caused by excess moisture in the air meeting cold surfaces, and is the most common cause of black mould in bathrooms and kitchens. Each type requires a fundamentally different treatment — we diagnose the cause using professional-grade moisture meters and thermal imaging cameras before recommending a solution.
- How can I tell if my house has a damp problem?
- Common warning signs include peeling or bubbling wallpaper, black mould growth (especially in corners and behind furniture where air circulation is poor), a persistent musty smell, white salt deposits (efflorescence) on walls, damp patches that feel cold to the touch, rotting skirting boards or window frames, and condensation regularly forming on windows during cooler months. In older London properties — particularly Victorian terraces built between 1850 and 1910 across South East London — damp is especially common at ground floor level where the original slate or bitumen damp-proof course may have deteriorated or bridged by raised external ground levels. Moisture readings above 20% on a protimeter-type meter generally indicate an active damp problem requiring treatment. We offer a free damp inspection where we use calibrated moisture meters and thermal imaging to diagnose the type and severity of the problem, then provide a written report with recommended treatments and a fixed-price quote.
- Do you offer a guarantee on damp proofing work?
- Yes, all our damp proofing treatments come with a written guarantee backed by both our company and the product manufacturers. Chemical DPC injection treatments using silicone-based cream systems from suppliers like Safeguard or Sovereign carry a 20-year guarantee as standard. Basement tanking systems using cementitious slurry coatings or cavity drain membranes are guaranteed for 10 years. External waterproofing and penetrating damp repairs are guaranteed for the expected lifespan of the materials used, typically 10-15 years depending on exposure. The guarantee covers both materials and workmanship, and we provide full documentation including a Property Care Association compliant certificate that you can pass on if you sell the property. This documentation is routinely requested by solicitors during conveyancing and by mortgage lenders during valuations, so having a properly guaranteed treatment from a reputable contractor adds measurable value when you come to sell and avoids potential issues with property transactions.
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