Dry Rot Treatment London — Specialist Eradication of Serpula lacrymans
Dry rot (Serpula lacrymans) is the most destructive fungal decay affecting UK buildings. It spreads through masonry, compromises structural timbers, and will not stop without professional intervention. Our PCAQT-certified specialists identify the moisture source, eradicate the fungus, replace affected timbers, and guarantee the result.
Fixed-fee survey · Written report included · No obligation to proceed · Guaranteed works available
Understanding the problem
What Is Dry Rot — and Why Is Serpula lacrymans So Dangerous?
Dry rot is caused by a single species — Serpula lacrymans. Unlike wet rot, which stays localised to visibly damp timber, dry rot produces mycelium strands that actively transport moisture, allowing it to spread through masonry and plaster into dry areas of a building in search of new timber to colonise.
Once established, dry rot attacks timber’s cellulose, leaving behind characteristic dark brown cuboidal (block-like) cracking and a brittle, hollowed structure that can no longer bear load. The visual damage you can see is almost always only a fraction of the actual infestation — the rest is concealed within walls, under floors, and behind plasterwork.
Dry rot typically begins when timber reaches a moisture content of 20–30%. Once active, the fungus generates its own moisture through metabolic activity, enabling it to continue spreading even as surrounding conditions dry out — which is why addressing the moisture source alone is never sufficient.
Advanced dry rot — what the damage reveals
Warning signs
Signs You Have Dry Rot in Your London Property
Dry rot most commonly develops in poorly ventilated spaces — under suspended timber floors, in roof voids, behind wall panelling, and in basement areas. By the time it’s visible, the infestation is usually already advanced.
Cuboidal cracking in timber
Deep, block-like cracks across and along the grain — the definitive visual signature of Serpula lacrymans, distinct from the longitudinal cracking of wet rot
White or grey mycelium strands
Cotton-wool-like growth on timber or masonry surfaces. Mycelium strands can extend several metres from the original infection site through walls
Fruiting bodies (sporophores)
Pancake-like mushroom structures, typically rusty-orange, with a white or grey margin. Produce millions of rust-red spores — a sign of a well-established colony
Rust-red spore dust
Fine rust-coloured powder on surfaces near affected timber — airborne spores that can seed new infestations if disturbed without professional control measures
Springy or sunken flooring
Noticeably soft, bouncy, or uneven floorboards — especially in older London properties with suspended timber ground floors — often indicates joist decay beneath
Distinctive musty smell
A sweet-musty, earthy odour — especially noticeable in confined spaces, cellars, or under-stair cupboards — that returns after ventilation
Suspect Dry Rot? The Sooner It’s Surveyed, the Less It Costs.
PCAQT-certified specialists available across London this week. Call now or book a survey online — no obligation to proceed with works.
Our treatment methodology
How We Eradicate Dry Rot — A Six-Stage Process
DIY treatments consistently fail because they address visible symptoms rather than the moisture source and the full extent of spread. Our six-stage methodology is built around complete eradication — not surface treatment.
Full Inspection & Survey
Moisture meters and physical investigation map the extent of infestation and identify all affected timbers — visible and concealed
Full extent mappedMoisture Source Eliminated
The root cause — leak, failed DPC, blocked vent, defective masonry — is resolved before any timber work begins. Without this step, the fungus returns
Root cause firstInfected Timber Removed
All infected timber is cut out — typically 300–500mm beyond visible growth — to ensure no active mycelium remains. Surrounding masonry also investigated
Safety margin enforcedFungicidal Treatment
Specialist fungicidal treatments applied to remaining timbers, masonry, and plaster to kill residual spores and prevent regrowth
Spore eliminationStructural Repair
New pre-treated timber installed. Where structural elements are affected, like-for-like or upgraded replacement carried out to full structural specification
Pre-treated timber usedGuarantee Issued
A written guarantee covering our treatment and works. Insurers and solicitors frequently require this documentation for property sales and remortgages
Written guaranteeWhy specialist treatment is essential
Why DIY Dry Rot Treatment Fails — and What the Correct Approach Requires
The majority of failed dry rot treatments share the same root cause: the moisture source wasn’t found, the full extent of spread wasn’t mapped, or insufficient timber was removed. Dry rot does not respond to surface-level intervention.
🔍 Moisture Source Not Found
Without eliminating the moisture that feeds the fungus, treatment is temporary. Dry rot can metabolise moisture from its own activity — meaning even after visible dampness is resolved, the colony can persist and rebuild.
🧱 Hidden Spread Missed
Serpula lacrymans mycelium travels through masonry. Without physical investigation of walls and voids adjacent to visible damage, significant colonies are routinely left untreated — regrowing within months.
🪵 Insufficient Timber Removed
Dry rot extends well beyond the point of visible decay. Industry best practice requires removal of all visibly affected timber plus a minimum safety margin — typically 300–500mm — to ensure no active mycelium remains.
🧪 Ineffective Products Used
Retail fungicidal products are formulated for surface mould, not deep timber or masonry colonisation by Serpula lacrymans. Professional-grade treatments penetrate to the depth required to kill the fungus at its growth frontier.
Know the difference
Dry Rot vs Wet Rot — Diagnosis Determines Treatment
Both are fungal timber decay, but they behave very differently and require different remediation approaches. Misidentifying wet rot as dry rot — or vice versa — leads to unnecessary or ineffective work.
We diagnose and treat both. If you’re unsure which you have, a professional survey is the only reliable way to confirm — visual identification alone is frequently misleading.
Surveyor or Solicitor Flagged Timber Decay?
A professional dry rot survey with written report is what mortgage lenders, solicitors, and insurers require. Same-week appointments available.
Who we work with
Homeowners, Buyers, Landlords & Property Investors
Protect your purchase and your property value
- Pre-purchase dry rot surveys with rapid turnaround
- Surveyor-flagged timber decay independently assessed
- Written report for mortgage lenders, solicitors, and insurers
- Guarantee documentation for property sales and remortgages
- Honest assessment — we’ll tell you if a suspected case is wet rot, not dry rot
- Clear cost estimates before any works proceed
Structural timber decay is a landlord liability
- Section 11 LTA 1985 requires landlords to maintain structural integrity
- HHSRS-aware survey reports for council and legal use
- Multi-property and HMO surveys accommodated
- Direct tenant liaison — your attendance not required
- Guaranteed works with documentation for compliance files
- Portfolio inspections and periodic monitoring available
What PCAQT certification means
Why Qualification Matters in Dry Rot Treatment
PCAQT — Property Care Association Qualified Technician — is the industry qualification standard for timber and damp specialists in the UK, operated by the Property Care Association (PCA). It requires demonstrated competency in timber decay diagnosis, treatment methodology, and structural assessment.
In practical terms: every dry rot survey and treatment we carry out is done by a professionally qualified specialist, not a general tradesperson. This matters for the quality of diagnosis, the legal defensibility of the report, and the integrity of the guarantee we issue.
Our guarantee
Guaranteed Dry Rot Treatment — What We Stand Behind
A guarantee is only as strong as the methodology behind it. We guarantee our dry rot treatments because our process — moisture source elimination first, sufficient timber removal, professional fungicidal treatment, pre-treated replacement timber — is designed to be permanent.
What Our Dry Rot Guarantee Covers
Our written guarantee covers the treatments and structural repairs we carry out against recurrence of dry rot in the treated area, subject to the moisture source remaining resolved. The guarantee documentation is issued on completion and is transferable — meaning it passes to a new owner if the property is sold, which is frequently a requirement of property solicitors and mortgage lenders during a transaction involving previously treated dry rot.
Where we work
Dry Rot Treatment Specialists Covering Greater London
We cover most of Greater London and Hertfordshire. We’re particularly active across North, North West, West, and Central London. Call us to confirm availability for your borough.
North London
Barnet · Finchley · Hendon · Golders Green · Mill Hill · Edgware · Colindale · High Barnet
North East London
Haringey · Wood Green · Tottenham · Hackney · Enfield · Barking & Dagenham
West London
Ealing · Chiswick · Acton · Greenford · Kensington · Hammersmith · Fulham · Chelsea
North West London
Wembley · Willesden · Harlesden · Kilburn · Queens Park · Brent
Central London
Camden · Hampstead · Belsize Park · Kentish Town · St John’s Wood · Islington
Hertfordshire
St Albans · Hemel Hempstead · Bishop’s Stortford · Hertford
What our customers say
Trusted by London Homeowners, Landlords & Property Professionals
My homebuyer’s survey flagged possible dry rot in the subfloor and the sale nearly fell through. Damp & Mould Solutions surveyed within two days, produced a full report with moisture readings and photos, and the treatment with guarantee was exactly what the solicitor needed to proceed.
A previous company had treated our floor joists and the dry rot came back within a year. These specialists identified that the original moisture source — a failed air brick — had never been addressed. Proper treatment this time and we have a proper guarantee. Should have called them first.
As a landlord with older Victorian stock, I’ve used them across three properties now. They’re thorough, the reports are clear enough for my solicitor, and they liaise directly with tenants so I don’t need to be present. Highly recommended for landlords.
Common questions
FAQ
How much does dry rot treatment cost in London?
Can I sell a property with dry rot — or that had dry rot?
My homebuyer’s survey flagged dry rot — what should I do?
How long does dry rot treatment take?
Does dry rot treatment affect my neighbours?
What’s the difference between PCAQT and CSRT certification?
Can dry rot return after treatment?
Book your survey
Book a Dry Rot Survey in London
Speak to a PCAQT-Certified Specialist
Describe what you’ve found or what your surveyor has flagged. We’ll advise on whether a specialist survey is the right next step — and if you’re under time pressure from a property transaction, tell us and we’ll prioritise accordingly.
💡 Tip: Send photos of the affected timber and any surveyor’s report to info@dampandmouldsolutions.co.uk — we can advise on urgency and likely scope before you book.
Request a Dry Rot Survey
Fill in your details and we’ll get back to you promptly — typically within a few hours during business hours.
Get Dry Rot Diagnosed and Treated This Week
PCAQT-certified specialists, guaranteed treatments, written reports for solicitors and lenders — no obligation survey available across London.