Urgent repair
Call to discuss the fault
Call to discuss active water ingress or extensive recurring moisture damage. Report damp and mould promptly to the responsible landlord or building manager.
Call 020 4571 4235Mayfair · Damp & mould investigation
Damp & mould investigation in Clapham
Damp patches, recurring mould or water coming through a wall?
Tell us what needs doing. We’ll organise the right help and explain the price.
All London boroughs · Homes, landlords & managed properties · Your area: Clapham
- Direct enquiries
- Clear scope and price
- You approve extra work
- Your project price
- Request a scoped quote Materials, preparation and access included as agreed. VAT shown in your quotation.
- Need help urgently?
- Call for availability Tell us your postcode, work required and access arrangements. Sending a form does not book attendance.
Investigation is quoted to scope. Specialist surveys, laboratory testing, waterproofing systems and reinstatement are separate unless expressly included. A visual inspection is not a structural or mortgage survey.
Find out what is causing the moisture before paying for a treatment. Mayfair arranges investigation of damp, condensation and water ingress across London, then helps coordinate the agreed source repairs and making good.
Start with what you can see
Find the right repair in Clapham
You do not need to know the technical name. Choose the description that fits, then see the repair options and what to include in your enquiry.
Is my damp wall caused by condensation or a leak?
Appearance alone cannot establish the cause. Tell us whether the patch follows rain, use of plumbing or cold weather, and whether it changes size. Mayfair can arrange the appropriate investigation; a moisture reading by itself is not a complete diagnosis.
Mould keeps coming back. Will repainting fix it?
Repainting does not resolve the source of recurring moisture. Describe the affected rooms, ventilation and any signs of leaks. Investigation should establish the cause and suitable remedial scope before decorating is arranged.
Is a damp patch near the skirting definitely rising damp?
No. Low-level staining or damaged plaster is a symptom, not proof of rising damp. Leaks, external moisture and other causes need consideration. Request an investigation before committing to injection treatment, replastering or waterproofing.
The work, explained
How we can help
- Damp patches, recurring condensation and mould enquiries.
- Rain-related water ingress and suspected external defects.
- Specialist investigation and repair proposals for below-ground or concealed problems.
Investigation is quoted to scope. Specialist surveys, laboratory testing, waterproofing systems and reinstatement are separate unless expressly included. A visual inspection is not a structural or mortgage survey.
Help us plan your visit
What to include in your enquiry
- Describe the affected rooms, how long the problem has existed and whether it follows rain or use.
- Share previous reports, repairs and photos of the whole affected surface.
- Mention vulnerable occupants and notify the landlord or building manager where relevant.
Choose the closest job
What do you need help with?
Not sure why a wall feels damp?Damp surveys & investigationScope, costs & enquiry →Mould keeps returning around windows or walls?Condensation & recurring mould investigationScope, costs & enquiry →
A wall becomes wet after rain?Penetrating damp investigationScope, costs & enquiry →Damp or damaged plaster near the skirting?Rising damp assessment & investigationScope, costs & enquiry →Water entering through an outside wall?External wall leak investigationScope, costs & enquiry →Water entering a basement or lower-ground room?Basement leaks & waterproofing assessmentScope, costs & enquiry →A price for the agreed work
Investigation is quoted to scope. Specialist surveys, laboratory testing, waterproofing systems and reinstatement are separate unless expressly included. A visual inspection is not a structural or mortgage survey.
The final price depends on the work, materials, access and time required. Share photos and the full brief so we can explain the visit and what is included before you book.
From enquiry to finished work
- Send the fault or task list and your postcode.
- Agree the scope, price and appointment with Mayfair.
- We arrange the appropriate trade and explain any extra work for your approval.
Workmanship cover, duration and exclusions are set out in the written quotation. Product warranties follow their manufacturer’s terms.
Direct to Mayfair · No chat required
Request your service quote.
Tell us what’s happening and where. We’ll help you work out the next step and what it costs.
No account needed. No payment to send an enquiry.
- Your details
- Review and send
- Request status
This is not an emergency response service. Do not wait for an online reply if there is an immediate risk to people or property.
How quotes and orders work →Help us plan your repair
Damp patches, recurring mould or water coming through a wall?
Describe the affected rooms, how long the problem has existed and whether it follows rain or use.
London coverage
Damp & mould investigation in Clapham
Planning the repair at your Clapham property
For a Clapham conversion or home near the Common, tell us which floor has the fault and whether original windows, cornices or timber must be retained. Work reaching another flat needs access to both homes.
A damp patch crossing a property boundary
Include reports from the room above or adjoining home, the dates of visible changes and any earlier investigations. The source may need access outside your own rooms. We scope the investigation before recommending a treatment.
Older wall materials need an appropriate investigation
For an older wall, include earlier treatments, replacement coatings and when damp appears. The surface finish alone cannot establish the cause. Investigation should inform any ventilation, source-water or fabric work before a waterproofing product is selected.
Example work, explained
Finding the cause of a damp wall
- The problem
- A damp patch, peeling finish or recurring staining needs a cause established. A meter reading or photograph alone cannot distinguish every source of moisture.
- The work involved
- Review when the patch appears, nearby plumbing, external defects, ventilation and the building's construction. Agree further investigation and source repairs from the findings.
- Checks and next steps
- Explain the likely source, any limits of the inspection and the plan for repair and drying. Surface treatment or redecorating is considered once the underlying problem is addressed.
Need similar work at your Clapham property? Tell us the symptoms and access arrangements.
Help us prepare the right visit
Describe the affected rooms and any marks above or below them. Include the full street address, existing repair records and which original features should be protected.
Can you tell whether the damp is from my neighbour?
Not from the patch alone. Inspection, symptom history and sometimes coordinated access are needed to distinguish water ingress, a leak and other moisture mechanisms.
Is waterproof paint the right treatment for an older damp wall?
It should not be selected from the stain alone. The moisture source, wall construction and existing coatings need assessment before a suitable repair or treatment is proposed.
Other places in the linked boroughs include Brixton, Streatham, Clapham, Dulwich, Battersea, Putney, Balham, Tooting. These are service areas, not separate Mayfair offices.
Damp & mould investigation in Brixton →Damp & mould investigation in Dulwich →Damp & mould investigation in Battersea →Damp & mould investigation in Putney →Damp & mould investigation in Balham →Damp & mould investigation in Tooting →View Lambeth services →View Wandsworth services →
Finding the right address in Clapham
Clapham High Street and the Common are useful landmarks for a repair enquiry. The wider Common area reaches Lambeth and Wandsworth; give the street as well as SW4. Clapham Junction is a separate Battersea-area destination.
All maintenance services in Clapham →
Postcode districts and borough boundaries
Local postcode examples: SW4. These are examples of addresses associated with Clapham, not a complete or exclusive boundary.
Lambeth: CR4, SE1, SE11, SE19, SE21, SE24, SE27, SE5, SW12, SW16, SW2, SW4, SW8, SW9.
Wandsworth: SW11, SW12, SW15, SW16, SW17, SW18, SW19, SW4, SW8.
These are borough-wide postcode associations. A district can cross boroughs and include other neighbourhoods or addresses outside London. Even a full postcode shown in the finder gives district suggestions, not an address check. Give the street address and full postcode when booking.
Area and postcode references: Lambeth: Clapham area profile · Lambeth: Clapham postal reference. Neighbourhood names and conservation-area boundaries are different things; council requirements depend on the actual property.
Borough postcode reference: ONS Postcode Directory, August 2026. Active small-user postcodes allocated by ONS to London authorities; this is a browsing guide, not an appointment or address-validation service.
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v.3.0.
Questions about damp & mould investigation
Can you tell the cause of damp from a photograph?
Photos help describe the symptoms but do not prove the cause. Building condition, moisture sources and the history of the problem need consideration before a treatment is recommended.
How much does damp & mould investigation cost?
Investigation is quoted to scope. Specialist surveys, laboratory testing, waterproofing systems and reinstatement are separate unless expressly included. A visual inspection is not a structural or mortgage survey. We provide a quote including VAT for the agreed work.
Do you cover Clapham?
Yes. We cover Clapham, with coverage across its wider borough and all other London boroughs. Send your full postcode and work details to arrange the right attendance.