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
Penetrating damp investigation in London
A wall becomes wet after rain?
Tell us what needs doing. We’ll organise the right help and explain the price.
All London boroughs · Homes, landlords & managed properties · Your area: Greenwich
- 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.
Rain-related staining can involve external joints, coverings, rainwater goods or other defects. Record the weather pattern and affected location so the investigation can follow the likely routes without assuming the visible mark identifies the entry point.
The work, explained
What the visit can include
- Review the timing and affected areas.
- Agree safe external and internal inspection access.
- Define source repairs and making good separately.
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
- Note whether wind direction affects the leak.
- Send safe ground-level exterior photos.
- Identify any shared wall or roof arrangements.
Choose the closest job
More damp & mould investigation
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 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.
Height, access and the source of ingress affect investigation and repair costs.
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.
Speak directly to Mayfair
Get your free quote.
Get a free quote for Penetrating damp investigation in Greenwich. Tell us the problem and we’ll contact you about the work and price.
Free quote. No obligation. No account needed.
Requesting a quote is free. If the fault needs an on-site diagnosis, we explain the visit charge before you book. Repairs, call-outs and inspections are chargeable.
For an active emergency, call our 24/7 line on 020 4571 4235. This form does not dispatch an engineer. For immediate danger to people, call 999.
How your repair quote worksHelp us plan your repair
A wall becomes wet after rain?
Note whether wind direction affects the leak.
London coverage
Damp & mould investigation across London
We serve all 32 London boroughs and the City of London. Choose an area to see repair options, visit preparation and a direct enquiry route.
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 Greenwich property? Tell us the symptoms and access arrangements.
Use a borough, local area or the first part of a postcode. Choose a result for service details and a quote.
About neighbourhoods and postcode matching
August 2026 ONS postcode data identifies boroughs sharing an outward district. Named centres use London Plan references; neighbourhood postcode examples use local address sources. Neither defines an exact neighbourhood boundary. Even a full postcode entered here is matched only by its first part.
Where a dedicated local service guide is available, we link to it. Other places lead to the relevant borough guide with your selected area carried into the enquiry. Your full repair address is needed when arranging attendance.
Browse London boroughs and local areasOpen a group to find your borough or neighbourhood
City of London7 local areas
City of Westminster21 local areas
View City of Westminster coverage
- Baker Street (part)
- Belgravia
- Covent Garden/ Strand
- Edgware Road South
- Edgware Road/ Church Street
- Fitzrovia
- Harrow Road
- Knightsbridge
- Marylebone
- Marylebone High Street
- Marylebone Road
- Mayfair
- Piccadilly Circus
- Pimlico
- Praed Street/ Paddington
- Queensway/ Westbourne Grove
- Soho
- St John's Wood
- Victoria Street
- Warwick Way/ Tachbrook Street
- West End
Barking and Dagenham5 local areas
Barnet17 local areas
Bexley5 local areas
Brent15 local areas
Bromley8 local areas
Camden15 local areas
Croydon11 local areas
Ealing8 local areas
Enfield6 local areas
Greenwich10 local areas
Hackney7 local areas
Hammersmith & Fulham3 local areas
Haringey9 local areas
Harrow13 local areas
Havering7 local areas
Hillingdon6 local areas
Hounslow4 local areas
Islington6 local areas
Kensington and Chelsea15 local areas
Kingston upon Thames4 local areas
Lambeth13 local areas
Lewisham10 local areas
Merton5 local areas
Newham6 local areas
Redbridge7 local areas
Richmond upon Thames5 local areas
Southwark10 local areas
Sutton9 local areas
Tower Hamlets11 local areas
Waltham Forest8 local areas
Local service guides and related borough coverage. Named centres are drawn from the London Plan town-centre network, with council references for additional places. A centre, neighbourhood and postcode district can have different boundaries.
Questions about damp & mould investigation
Should a damp internal wall be replastered first?
Resolve the source and agree drying and preparation before reinstating the finish, otherwise the new work may be damaged again.
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 penetrating damp investigation cost?
Height, access and the source of ingress affect investigation and repair costs. We provide a quote including VAT for the agreed work.
Do you cover all of London?
Yes. We cover all 32 London boroughs and the City of London. Select a borough below or include your full postcode when requesting a quote. The appointment depends on the required work and available specialist.