Damp Proofing in London — Surveys & All Treatments
We provide complete damp proofing for London properties — from an independent survey through to treatment, replastering, and a 20-year guarantee on rising damp and 10-year on all other damp treatment. CSRT-certified surveyors. No call centres, no sales reps.
Surveys from £150 · Written report within 48–72 hrs · No obligation to proceed
Damp proofing in London
Why London Properties Are Prone to Damp
Not all damp is the same — and the type and cause in London is shaped by the age and construction of its housing stock.
London’s mix of pre-1919 Victorian and Edwardian terraced housing, post-war council stock, and converted flats means rising damp, penetrating damp, and condensation mould all occur across the city — often in the same property. The borough, age, and construction type of your home determines which treatment is needed. We survey properties across London regularly and understand the specific construction types, typical failure points, and local ground conditions that influence which treatment will work — and which won’t. A generic damp proofing company applying a blanket DPC injection to a condensation problem is the most common and costly error we reverse.
What we treat in London
Damp Proofing Treatments We Provide in London
Each treatment below has a dedicated page with full detail on process, costs, and what to expect. Every job starts with an independent survey — we never treat without diagnosis.
Rising Damp Treatment
Chemical DPC injection at mortar course level, removal of salt-contaminated plaster, and specialist replastering with salt-resistant render. Common in London’s pre-1919 housing stock.
Full details on rising damp treatment →Penetrating Damp Treatment
External defect repair first — repointing, render patching, or waterproof coating — then internal plaster treatment. Patches that appear after rain are the key sign.
Full details on penetrating damp →Condensation & Mould Control
PIV system installation, extractor fans, and condensation control units. The most common damp type in London flats and upper floors — frequently misdiagnosed as rising damp.
Condensation control services →Basement Waterproofing
Cavity drain membrane systems and tanking slurry coatings for below-ground spaces, cellars, and lower-ground-floor flats. Increasing demand across London conversions.
Basement waterproofing details →Damp Surveys
CSRT-certified survey using moisture meters and hygrometers. Written report with diagnosis, photographs, and cost estimates — from £150. No pressure to proceed.
Book a damp survey →Replastering After Treatment
Specialist sand-and-cement render after every damp treatment. Standard plaster fails on newly treated walls within months — we never cut this corner.
Replastering damp walls →Damp in a London Property? Get a Same-Week Survey.
CSRT-certified surveyors and a written report within 48–72 hours. No obligation to proceed with works.
Warning signs
Signs of Damp in London Properties
Tide marks on lower walls
Horizontal staining below 1.2m — a classic sign of rising damp in ground-floor rooms
Black mould in corners
Mould around windows, in ceiling corners, or behind furniture — most often condensation
Peeling wallpaper or blown plaster
Bubbling paint or paper lifting away from the wall — moisture is behind the surface
White salt deposits on brickwork
Efflorescence — white crystalline marks — is a hallmark sign of rising damp in masonry
Persistent musty smell
A damp odour that returns after cleaning indicates an active moisture source
Surveyor flagged damp
A homebuyer’s survey has noted moisture — get an independent specialist opinion before proceeding
⚠ Damp & Mould Are a Health Risk — Not a Cosmetic Issue
Prolonged mould exposure — particularly black mould — affects respiratory health, especially in children, elderly residents, and those with asthma or allergies.
Pricing
Damp Proofing Costs in London
Costs depend on the type of damp, size of the affected area, and whether replastering is required. These are indicative London ranges — all pricing confirmed in writing after survey.
| Treatment | Typical Cost |
|---|---|
| Damp survey (London) | From £150 |
| Rising damp — single wall + DPC + replaster | £1,200 – £2,000 |
| Full ground floor rising damp treatment | £2,500 – £4,500 |
| Penetrating damp repair (external + internal) | £800 – £3,500 |
| Condensation control — PIV installation | £400 – £900 |
| Basement tanking (single room) | £3,000 – £8,000 |
Our process
How We Treat Damp in London Properties
Every job follows the same sequence. Skipping the survey or the specialist replastering is why most repeat damp failures occur.
Survey
CSRT inspection, moisture mapping, written report
Quote
Itemised written quote — materials and labour listed separately
Prep
Affected plaster, skirtings, and coverings removed
Treatment
DPC injection, external repairs, ventilation — or combination
Dry & Replaster
Walls dried, salt-resistant render applied — never standard plaster
Guarantee
Written guarantee issued — transferable to new owners on sale
Real projects · Real results
Damp Treatment in London — From Wall Preparation to Finished Plaster
These are photographs from actual jobs — not stock images. They show what a properly executed damp proofing project looks like at each stage: stripped and injected walls, then replastered and ready to decorate.
DPC Injection & Wall Preparation
Chemical damp proof course injected at mortar course level. Contaminated plaster stripped back to bare masonry. This is what a correctly prepared wall looks like before replastering — skipping this step is why most treatments fail.
Rising Damp Treatment
Replastered with Salt-Resistant Render
Specialist sand-and-cement backing coat followed by finish plaster — applied only once the wall has dried to the correct moisture level. Standard finishing plaster is never used on a newly treated wall; salts cause it to fail within months.
Replastering After TreatmentWhy choose us
Why London Homeowners & Landlords Use Damp & Mould Solutions
🎓 CSRT-Certified Surveyors
Every survey in London is carried out by a CSRT-qualified specialist — not a sales rep with a moisture meter. The recognised professional standard for damp diagnosis.
🤝 No Sales Pressure
Our surveyors have no vested interest in recommending works. We’ll tell you if the problem is minor — and we won’t skew findings to generate treatment work.
🛡 20-Year Rising Damp Guarantee
All rising damp treatment carries a 20-year written guarantee, transferable to a new owner — supporting property valuations and conveyancing.
Who we work with
For London Homeowners, Landlords & Property Buyers
Accurate diagnosis, no guesswork
- Independent written report — not a sales pitch
- Advice on what to fix now and what can wait
- Pre-purchase surveys with rapid turnaround
- Full remediation and replastering under one roof
Meet your legal duty in London
- HHSRS-aware assessment for rental properties
- Documentation demonstrating duty of care
- Minimal disruption to tenants during works
- Multi-property and HMO work accommodated
Also covering
Damp Proofing Near London
We cover the surrounding boroughs and areas. If your property is close to London, we can likely visit within the same week.
Ready to Book a Damp Survey in London?
Same-week appointments available. CSRT-certified. Written report within 48–72 hours. Call us or fill in the form below.
Common questions
FAQ
Do you offer damp proofing services in London?
What types of damp are most common in London properties?
How much does damp proofing cost in London?
How quickly can you visit a property in London?
Do you carry out both the survey and the damp proofing works in London?
I’ve had damp treatment in London before and it’s come back. Can you help?
Are your surveyors qualified to work in London?
Can damp proofing work be done with tenants in the London property?
Book now
Book Your Damp Survey in London
Speak to a CSRT-Qualified Surveyor
Tell us about your London property and what you’ve noticed. We’ll advise on the right next step with no obligation to book or proceed with works.
💡 Tip: Send photos of the affected area to info@dampandmouldsolutions.co.uk — the more we can see before we visit, the more targeted the survey.
Request a Survey in London
Fill in your details and we’ll get back to you promptly.
Get Your Damp Diagnosed in London This Week
CSRT-certified surveyors, written report within 48–72 hours, and an honest independent diagnosis — no sales pressure.