Damp proofing in London
Rising damp, penetrating damp or condensation - our London damp specialists diagnose the real cause, fix it properly and back every job with an unconditional 12-month guarantee. We respond across London within 24-48 hours, with a free assessment and a fixed written quote before any work begins.
- 24-48h London response
- 12-month guarantee
- Fixed quotes, no call-out charge
- 8,500+ jobs completed
Free damp assessment - fixed quote before any work
The three types of damp - and why the diagnosis matters
Most failed damp proofing jobs fail because the wrong damp was treated. A chemical damp-proof course does nothing for condensation; a dehumidifier does nothing for a leaking parapet. We diagnose first, then fix the actual cause.
Rising damp
Moisture climbing up through brickwork where the damp-proof course has failed or - in many Victorian London terraces - was never fitted at all. Tell-tale tide marks and salts on ground-floor walls. Fixed with a replacement damp-proof course and replastering where needed.
Penetrating damp
Water forced through the building fabric: failed pointing, cracked render, leaking gutters, blown window seals or saturated solid walls. Shows as patches that darken after rain. Fixed at the defect, outside in - not painted over from the inside.
Condensation damp
Everyday moisture from cooking, showers and drying clothes settling on cold walls and windows - London's most common damp, and the one that grows black mould. Fixed with ventilation, insulation of cold spots and, where mould has taken hold, professional treatment.
Not sure which one you have? That is exactly what our free assessment is for - or start with a professional damp survey in London. If mould has already taken hold, our mould removal specialists treat the damp and the mould as one job.
Damp proofing costs in London
Industry cost guides put the average London damp proofing job at around £1,220-£1,275. Where damp has caused mould, treatment typically runs from £200-£450 for a minor area, £600-£1,200 for a medium job and £1,500-£5,000 for severe, whole-property cases. Every job gets a fixed written quote before work starts - the price we quote is the price you pay.
Damp proofing (London average)
£1,220-£1,275
Typical industry-guide average; depends on cause and area affected
Minor mould treatment
£200-£450
Single wall or small area, cause identified and treated
Medium mould treatment
£600-£1,200
One or two rooms, source fixed, surfaces protected
Severe / whole property
£1,500-£5,000
Widespread damp and mould, full diagnosis and remediation
Free assessment, no call-out charge, and an unconditional 12-month guarantee on every job.
Why London homes are so prone to damp
London's housing stock is practically a catalogue of damp risks. Victorian and Edwardian terraces - the backbone of boroughs like Lewisham, Newham and Ealing - were built with solid brick walls and, in many cases, no damp-proof course at all. London clay holds water against older foundations, basement and lower-ground flats sit below the water table after heavy rain, and blocked-up chimneys trap moisture inside the fabric.
At the other end of the scale, modern airtight flats in Tower Hamlets and Newham build up condensation because everyday moisture has nowhere to go. Different eras, different causes - which is why our damp specialists diagnose every property individually rather than selling the same treatment to everyone.
Backed by a 12-month guarantee
If treated mould returns within 12 months, we come back and put it right. Accredited, insured and DBS-checked teams on every job.
Damp specialists across London
We cover every London borough within 24-48 hours, including in-depth local coverage in:
Landlord or letting agent? Damp and mould duties now run to a legal clock - see our guide to Awaab's Law for private landlords and get ahead of it with a documented survey and written remediation report.
Why choose Simpled Services
30+
Years of experience
8,500+
Jobs completed
140+
Google reviews
24/7
Availability for your needs
Accredited & insured
- CHAS
- Cyber Essentials
- SafeContractor
- Constructionline
- Gas Safe Register
- SSIP
- ISO 9001
- ISO 14001
- ISO 45001
- RISQS
Frequently asked questions
- How much does damp proofing cost in London?
- Industry cost guides put the average damp proofing job in London at around £1,220-£1,275, but the honest answer is that it depends entirely on the cause and the area affected - a single wall needing a new damp-proof course is very different from a basement flat with penetrating damp. We survey first, then give you a fixed written quote before any work starts, with no call-out charge.
- What types of damp do you treat?
- All three: rising damp (moisture climbing brickwork where a damp-proof course has failed or was never fitted), penetrating damp (water forced through walls, roofs or around windows) and condensation damp (everyday moisture settling on cold surfaces). Each needs a different fix, which is why every job starts with a proper diagnosis rather than a one-size-fits-all treatment.
- How quickly can you get to my property?
- We respond across London within 24-48 hours. Send photos with the quote form or on WhatsApp and we can usually give you an initial view and a plan the same day.
- Is damp proofing work guaranteed?
- Yes - every job is backed by our 12-month guarantee. If a problem we have treated comes back within 12 months, we come back and put it right.
- Do I need a damp survey before damp proofing?
- Yes, and we would be wary of any company that quotes for damp proofing without one. Treating the wrong type of damp wastes money and leaves the real cause active. Our free assessment identifies whether you are dealing with rising damp, penetrating damp, a leak or condensation before we recommend anything.
Get your free damp assessment
Tell us about the problem and your London postcode - we'll come back within 24-48 hours with a plan and a fixed, no-obligation quote.