Damp Proofing & Mould Removal Specialists in St Johns Wood
St Johns Wood combines grand 19th-century villas, Victorian and Edwardian mansion blocks and 1930s apartment blocks, much of it on heavy London clay. Basement and lower-ground floors, flat roofs above top-floor flats and shared waste stacks inside solid brick walls are all common sources of moisture. With high property values and a large conservation area, accurate diagnosis and sympathetic repair matter here more than almost anywhere.
Damp Specialists Who Know St Johns Wood Properties
Much of St Johns Wood was laid out as villa estates from the early 19th century, with Victorian and Edwardian mansion blocks and 1930s apartment blocks added later. The result is solid-wall brickwork, original basements never designed as living space, and conversions that have changed how each building handles moisture. We survey these properties regularly, and we know the visible symptom is rarely the whole story.
CSRT-qualified surveyors
Every survey carried out by a qualified specialist — not a sales rep.
Detailed written reports
Useful for mortgage lenders, insurers, and property purchases.
10-year guarantee
On selected damp proofing treatments — transferable on property sale.
Same-week surveys
Fast availability across St Johns Wood postcodes — NW8, NW1.
Damp Proofing, Surveys & Mould Removal Across St Johns Wood
We treat every common cause of damp in St Johns Wood residential and commercial properties. Each service begins with a proper diagnosis — we don’t recommend treatment until we know the cause.
Rising Damp Treatment in St Johns Wood
Rising damp is common across St Johns Wood’s older housing stock — particularly pre-1940 properties where original DPCs have failed or are absent. It presents as tide marks, salt deposits, and damp lower walls up to around one metre.
- Chemical DPC injection — CSRT-specified method
- Tanking and replastering with damp-resistant render
- 10-year guarantee on completed works
- Salt removal and finishing included
Damp Survey in St Johns Wood
A professional damp survey is the only reliable way to distinguish rising damp from penetrating damp or condensation. We use calibrated moisture meters, boroscopes, and hygrometers to map your St Johns Wood property accurately.
- CSRT-qualified surveyor — independent, not sales-led
- Written report with photographs and moisture readings
- Suitable for home purchases, mortgage requirements, and insurance
- Fixed-price quotation provided where treatment is required
Penetrating Damp in St Johns Wood Properties
Penetrating damp — caused by defective pointing, cracked render, damaged roofing, or leaking gutters — appears as damp patches following rainfall. Common throughout St Johns Wood’s period and post-war stock.
- Source identified before any treatment is carried out
- External masonry repair, pointing, and waterproof coatings
- Internal tanking where required
- No surface-only treatments without root-cause repair
Mould Removal & Condensation Control in St Johns Wood
Black mould in St Johns Wood flats and converted houses is almost always caused by condensation and inadequate ventilation — not structural damp. We treat the mould and address the root cause so it doesn’t return.
- Professional mould removal and anti-fungal treatment
- Positive input ventilation (PIV) for whole-home humidity control
- Ventilation assessment and fan installation
- Landlord documentation provided on request
Timber Treatment in St Johns Wood — Wet Rot, Dry Rot & Woodworm
Older properties in St Johns Wood with suspended timber floors can be affected by damp-related decay. Wet rot and dry rot left untreated will compromise structural integrity. We carry out full diagnosis and treatment.
- Wet rot and dry rot identification and eradication
- Woodworm treatment and preventive application
- Joist and floor repair or replacement where required
- Moisture source addressed as part of the same works
Pre-Purchase Damp Survey in St Johns Wood
Buying a property in St Johns Wood? Our pre-purchase damp and timber survey gives you a clear picture before you exchange — with fast turnaround for buyers working to exchange deadlines.
- Independent report — no vested interest in recommending treatment
- Fast turnaround for buyers working to exchange deadlines
- Covers rising damp, penetrating damp, condensation, and timber
- Report format accepted by mortgage lenders and solicitors
Not sure which service you need?
That’s exactly what a damp survey is for. We’ll identify the cause of your problem — rising damp, penetrating damp, or condensation — and tell you what’s actually needed to fix it. No upselling, no unnecessary work. Learn more about our damp survey →
Our Process in St Johns Wood
We never recommend treatment before we know the cause. Every job starts with a proper survey — and we’ll tell you honestly if you don’t need us.
Survey
CSRT-qualified specialist assesses your St Johns Wood property — often same week
Report
Written diagnosis with moisture readings, photographs, and honest conclusions
Fixed Quote
Itemised, written quote — no surprises, no hidden charges, no obligation
Treatment
Works carried out by our own engineers — not subcontracted — with full aftercare
Damp Problems We’ve Solved Across St Johns Wood
A small selection of recent jobs in the St Johns Wood area. Every property is different — these examples illustrate how we approach diagnosis and treatment in the local housing stock.
Villa Lower-Ground Floor, Grove End Road — Water Ingress to Basement Rooms
Lower-ground floor with damp patches on external walls and a musty smell after heavy rain. Survey found no working waterproofing to the retaining walls and a blocked external gully. Drainage corrected, cavity drain membrane system installed with sump and pump, and internal finishes restored to match the existing interior.
Victorian Terrace Conversion, St Johns Wood — Rising Damp to Ground Floor Flat
Ground floor flat with tide marks and salt-damaged plaster in two rooms. Survey confirmed a failed original DPC, bridged at the front by a raised garden path. Ground levels reduced, chemical DPC injected, and walls replastered with a salt-resistant system. 10-year guarantee issued.
Mansion Block Flat, Abbey Road — Staining and Black Mould to Top-Floor Bedroom
Recurring staining and black mould in a top-floor bedroom. Survey separated a failed parapet junction (penetrating damp) from condensation caused by an unventilated bathroom. Roofer instructed for the parapet repair, PIV installed, and a written report issued for the managing agent.
Damp Proofing Across St Johns Wood and Surrounding Areas
We cover St Johns Wood and all surrounding neighbourhoods. Select your area for local information, or call us to confirm availability.
Don’t see your area? Call 020 4542 6114 – we cover a wide area across North and North West London.
FAQ — Damp Proofing in St Johns Wood
How much does a damp survey in St Johns Wood cost?
Why is basement damp so common in St Johns Wood?
Can you survey flats in mansion blocks and converted villas in St Johns Wood?
Do you handle listed building and conservation area damp surveys in St Johns Wood?
Do you guarantee damp proofing and basement waterproofing in St Johns Wood?
Trusted by Homeowners & Landlords Across St Johns Wood
Book a Damp Survey in St Johns Wood
Speak to a CSRT-Qualified Damp Specialist
Tell us about the problem you’re seeing and your property type — we’ll confirm whether we can help and what to expect from a survey. St Johns Wood homeowners, buyers, and landlords all welcome.
Request a Survey in St Johns Wood
Fill in your details — same-week appointments frequently available across St Johns Wood.
Stop Damp at the Source in St Johns Wood
A proper diagnosis from a CSRT-qualified specialist before spending money on any treatment – that’s where every job starts.