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Damp, mould and leaks in Richmond

Leak Detection, Damp & Mould Surveys in Richmond

If a Richmond property has damp walls, recurring mould or a leak nobody can find, our team investigates non-invasively, explains the cause in plain English and sets out the fix in writing, across TW9 and TW10 in the London Borough of Richmond upon Thames.

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Fully insured  ·  Non-invasive methods first  ·  Written reports included  ·  London & Surrey

Richmond (TW9 and TW10) plus the nearby neighbourhoods of Twickenham, Teddington, Hampton Wick, Kew, North Sheen, Barnes, East Sheen and Eel Pie Island, all attended by our own team.
Exposed ceiling joists and steel beams with old water staining, a prop supporting the structure
Joists exposed to check for moisture damage

Why Richmond properties get damp, timber decay and hidden leaks

Richmond is a riverside town in south west London, about eight miles from Charing Cross, with Richmond Park and a string of protected conservation areas, including most of Richmond Hill, whose view of the Thames is protected by its own Act of Parliament. The Georgian terraces built in the eighteenth century around Richmond Green and up Richmond Hill are now listed, and the nineteenth century added substantial housing along the streets that line the hill. The borough is the only one in London to straddle the Thames, and Richmond Hill itself climbs a steep river terrace above the flood plain.

Older, listed and conservation-area buildings in Richmond reward a careful, non-invasive approach. Our engineers map moisture with calibrated meters and thermal imaging before anything is disturbed, so that a single targeted access replaces exploratory holes in original plaster, panelling or floors. Solid walls, timber floors over shallow voids, parapet and valley gutters and later basement conversions each bring their own damp pattern, and the written report says which one is actually present.

Dry rot and wet rot searches are the most common way Richmond residents find us. Timber decay follows water, so the investigation always starts with the leak or the damp that is feeding it (a gutter, a concealed pipe, a bridged damp-proof course or a blocked sub-floor vent) and ends with a report on the extent of the decay and what has to be done.

Housing in Richmond upon Thames (Census 2021): of 80,704 households, 62% own their home, 25% rent privately and 12% rent from a council or housing association. By building type, 28% live in purpose-built flats, 12% in flats within converted or commercial buildings, 27% in terraces, 25% in semi-detached houses and 8% in detached houses.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.

What we do in Richmond

One team for the investigation, the report and the remedial work that follows.

Leak detection

Thermal imaging, acoustic listening and moisture tracing to pinpoint a hidden leak before any wall comes down.

Trace & access (insurance)

We find and expose the leak and document it for your escape-of-water claim.

Insurance-ready reports

Findings, cause, photographs and moisture readings in a report you can forward as soon as you receive it.

Urgent leaks & burst pipes

Water through a light fitting or a pipe that has let go? Call and we prioritise the visit.

Mould treatment & investigation

Mould is a symptom. We identify what is feeding it, treat the growth and specify the fix for the cause.

Damp & mould surveys

Room-by-room moisture mapping that separates condensation from penetrating and rising damp.

Moisture mapping & thermal imaging

Calibrated readings and thermal surveys that show exactly where the moisture is, and where it isn’t.

CCTV drainage surveys

Camera surveys that find blockages, collapses and leaking joints that feed damp into a property.

Damp and timber reports in Richmond

When a surveyor asks for a “damp and timber report” before a purchase or a remortgage, they want a clear statement of the moisture conditions and the state of the structural timber, written by someone who has actually looked. Lifting a few boards and reading the joists is part of that.

We provide exactly that document for Richmond properties: moisture mapping, timber inspection, identification of any decay, the cause, and the works required. No pressure to buy a treatment, and no treatment specified where the evidence does not support it.

Penetrating damp: rain finding its way in

After a wet week, a patch appears high on a chimney breast, beside a window or on the wall under a parapet, then fades in dry weather. That rhythm is the signature of penetrating damp: water getting through the fabric from outside, usually through a failed gutter joint, cracked render, open pointing, a defective flashing or a sill without a drip.

Our engineers read the pattern inside and then go and find the defect outside, because the fix is outside too. The report pairs each internal patch with its external cause, and our team quotes the repointing, render, roofing or rainwater repairs needed and carries them out or manages them.

Central heating and underfloor leaks

Pressure loss on a sealed heating system with no visible drip usually means a leak in a buried pipe, often under a kitchen or hallway screed. Digging up the floor to look is the last thing to do.

We pressure-test the circuit, scan the floor with thermal imaging while it heats, and use tracer gas or acoustic listening to narrow the leak to a tile or two. The written report gives the location and the recommended repair, which our team can carry out or manage.

Recurring mould in Richmond homes

If mould has been wiped off and painted over more than once, the moisture source has not been dealt with. Converted flats and older terraces in Richmond often combine cold external walls, limited extract ventilation and the odd hidden leak, and the result is growth that returns a few weeks after redecorating.

We separate condensation from leaks and damp with calibrated readings, then treat the growth and specify what has to change: a repair, better extraction, insulation at a cold bridge, or all three. Under Awaab’s Law social landlords must investigate and fix damp and mould hazards to set timescales, and the private rented sector is following; our reports are written to serve as that investigation record.

Escape of water: what your policy usually expects

Most buildings policies treat the damage caused by a leak differently from the leak itself. The damage is usually covered; the cost of finding the leak and opening up to reach it is covered only where the policy includes trace and access; and the repair of the pipe or fitting that failed is often not covered at all. Check your schedule.

That is why Richmond clients ask us for a report that keeps those three things separate. Ours does: the trace, the access, the repair and the resulting damage are each described and photographed, so the claim can be presented accurately and the parts that are not claimable are quoted plainly.

Real investigations by our team

Real jobs and real photographs, and below them the investigations our engineers have completed in and near Richmond.

White salt efflorescence and damaged mortar on external brickwork at ground level
Efflorescence at ground level, a sign of moisture moving through the brick
Room corner stripped back to bare brick and freshly re-plastered after damp treatment, radiator alongside
Damp wall opened up, treated and re-plastered by our team
Water-stained plasterboard hanging from an opened kitchen ceiling beneath a steel beam
Ceiling leak traced during an investigation
  • Kew same borough: mains leak meter test with a written report; no leak was found and the report supported a leak-allowance refund from the water company, October 2026.

How we investigate

Six stages, the same on every job, each one recorded in the report.

1

Inside and out

The affected rooms, the rooms around them and the outside of the building are inspected before any instrument comes out.

2

Mapping the moisture

Calibrated readings in a grid show the shape of the wet area and point towards its source.

3

Thermal imaging

Infrared scanning, where suitable, to reveal hidden moisture and cold spots behind finishes.

4

Narrowing it down

Acoustic equipment and tracer gas reduce the search from a whole floor to a tile or two.

5

Proving the pipe

A pressure drop on an isolated circuit confirms the leak is in that pipework and nowhere else.

6

Everything in writing

Cause, evidence, location and recommended works set out in a report you can send to an insurer, landlord or buyer.

The report, and what follows it

Expect a document you can forward: dated photographs, calibrated readings, thermal images where they were used, the identified cause and a list of recommended works. Any remedial work is quoted on its own and carried out or managed by our team if you choose.

Quotes: You will know the price of the investigation before it is booked and the price of any repair before it is started. Nothing is added on site without your agreement.

Book a damp, mould or leak investigation in Richmond

Call us, WhatsApp us, or request a call back and one of our team will get straight back to you. Urgent leaks are prioritised.

Get a call back☎ 0800 054 1524

Fully
Insured
Written Reports
Included
Urgent Cases
Prioritised
Housing & Compliance
Evidence Reports
Written Workmanship
Terms

Tell us about your Richmond property

Tell us what’s happening and one of our team will call you back. For urgent problems call 0800 054 1524.






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Richmond and the areas next to it

Twickenham · Teddington

We also attend Hampton Wick, Kew, North Sheen, Barnes, East Sheen, Eel Pie Island, Ham and Hampton.

Part of Richmond upon Thames borough page · All London boroughs · TW postcode area · All locations

Frequently asked questions about Richmond

Do you carry out the repairs as well as the investigation?

Yes. The investigation and report come first; remedial works are quoted separately and our team carries them out or manages them for you, with written workmanship terms.

What does a damp survey in Richmond involve?

An inspection of the affected rooms and the outside of the building, calibrated moisture readings in a grid, thermal imaging where useful, and a check of ventilation, ground levels and drainage. You get a written diagnosis and plan.

Can you investigate a leak coming from the flat above?

Yes. We establish whether the water is from the flat above, a communal pipe or your own property, document the route and write it up so the freeholder, managing agent and insurers can act. Access to the other flat helps and we will say so if it is needed.

Why does my mould keep coming back after cleaning?

Because mould is a symptom. Until the moisture source (condensation, a leak or damp) is dealt with, it returns. We find the cause first and set out the fix in writing so any treatment that follows lasts.

How long does an investigation take?

It depends on the size of the property and how elusive the leak is; most domestic investigations are completed in a single visit, and we tell you the likely duration when we quote. The written report follows the visit.

Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.