Damp Proofing Amersham | Survey & Treatment | Advanced Damp

Damp specialists covering Amersham & the Chilterns

Damp Proofing Amersham

Amersham is really two towns: the listed, timber-framed Old Amersham down in the Misbourne valley, and the Metro-land semis of Amersham-on-the-Hill above it, and each has its own damp problems. We diagnose the real cause, penetrating damp, condensation, rising damp or valley groundwater, and put it right. Survey-led, with a written 10 year guarantee.

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10 Year Guarantee Listed Homes & Metro-land Semis Survey-Led Diagnosis Local to the Chilterns CSSW & CSRT Trained

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Survey-led diagnosis with a clear, written report. No obligation.

Damp in Amersham Homes

Amersham splits neatly in two, and so does its damp. Old Amersham, down on the floor of the Misbourne valley, is one of the best-preserved old towns in England, a conservation area with more than 160 listed buildings, broad medieval High Street, timber-framed and flint cottages, coaching inns and elegant Georgian brick. Solid-walled and timber-framed property like this needs a breathable approach, not the cement renders and waterproof plasters that trap moisture in old fabric and feed timber decay.

Up on the hill is the other Amersham. Amersham-on-the-Hill grew as a Metro-land suburb around the station after the railway arrived in 1892, and it is full of 1920s and 1930s cavity-walled semis. In these the problem is rarely classic rising damp. Far more often it is penetrating damp through bays and render, or condensation and black mould once newer windows have cut the ventilation right down.

The geology divides the town too. The Chiltern chalk on the hill drains freely, but the valley floor is different: the Misbourne is a chalk stream that can see groundwater rise to the surface and overflow after heavy rain, and Old Amersham has flooded throughout its history. Valley-floor property can take in ground damp and below-ground water, so the only reliable starting point is a proper survey.

Damp proofing work to a wall by Advanced Damp

Damp Proofing Services in Amersham

Whatever the property and whatever the cause, we cover it, and we link each job to the right specialist treatment.

Penetrating Damp

Damp driven through bays and render, the most common issue in Amersham-on-the-Hill's Metro-land semis.

Condensation & Mould

Black mould in sealed semis and modern homes, cured with the right ventilation rather than a damp proof course.

Rising Damp

Genuine rising damp in older valley-floor and village property, treated with a new damp proof course where confirmed.

Timber & Rot

Woodworm, dry rot and wet rot in the timbers of Old Amersham's listed and timber-framed homes, treated at the cause.

Waterproofing

Structural waterproofing and tanking for cellars and ground floors on the Misbourne valley floor.

Damp Surveys

Independent, survey-led diagnosis with a clear written report, ideal for homebuyers and pre-purchase building surveys.

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Signs of Damp in Amersham Homes

If you are seeing any of these, it is worth getting the cause checked before it spreads:

Tide marks or staining low down on walls

Damp, musty cellars or ground floors

Damp patches around bays and chimneys

Black mould in corners and around windows

Streaming windows in the colder months

Flaking plaster and bubbling, peeling paint

A persistent damp, musty smell

Rotten or springy floor and skirting timber

How We Work, Survey to Completion

Book a survey

We arrange a convenient visit to your property, anywhere across Amersham and the Chilterns.

Diagnose the real cause

We use moisture readings and, where useful, thermal imaging to confirm whether it is penetrating damp, condensation, rising damp or groundwater, not guesswork.

Clear written report

You get a plain-English report setting out the cause, the recommended work and the costs, sympathetic to period and listed homes.

Carry out the work

Our technicians complete the treatment tidily and with minimal disruption, leaving the property clean.

Written guarantee

Installed work is backed by a written 10 year guarantee, transferable on sale.

Tanking and waterproofing work by Advanced Damp

What Our Customers Say

Genuine reviews from Advanced Damp customers.

★★★★★

"Lionel came to survey our flat. He couldn't have been pleasanter or more professional. He explained all his findings and we're hoping we're now on the way to resolving our mould problems."

Claire Hudson

Google review

★★★★★

"Very good service and found a leak in our roof and made it easier to relay that information to the roof guy."

John Hamlin

Trustpilot review

★★★★★

"We contacted Advanced Damp to help us with a damp issue on one of our windows. Communication was prompt, easy, friendly and professional. The assessment was carried out thoroughly and competently by Lionel and the report was comprehensive."

Gaby

Trustpilot review

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Areas We Cover Around Amersham

We cover Amersham and the surrounding Chilterns area, including:

Old Amersham
Amersham-on-the-Hill
Amersham Common
Chesham Bois
Little Chalfont
Coleshill
Winchmore Hill
Penn Street
Little Missenden
Great Missenden
Chalfont St Giles
Chalfont St Peter
Chesham
Holmer Green
Hyde Heath
Quill Hall
Stanley Hill
Shardeloes

Nearby too? See our Aylesbury page, or our main London damp proofing page.

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Damp Proofing Amersham FAQs

Which parts of Amersham do you cover?

All of Amersham and the surrounding Chilterns area, including Old Amersham, Amersham-on-the-Hill, Amersham Common, Chesham Bois, Little Chalfont, Coleshill, Winchmore Hill and the Chalfonts, plus nearby Chesham and Great Missenden.

I have damp in a 1930s semi in Amersham-on-the-Hill. Is it rising damp?

Usually not. Amersham-on-the-Hill grew as a Metro-land suburb around the station from 1892, so most of its housing is interwar cavity-walled semis. These far more often suffer penetrating damp through bays, render and bridged cavities, or condensation once double glazing has reduced ventilation, than genuine rising damp. We confirm the real cause with a survey before recommending anything.

Can you work on the listed timber-framed homes in Old Amersham?

Yes. Old Amersham is a conservation area with over 160 listed buildings, many of them timber-framed, flint or Georgian brick. Old fabric like this needs a breathable approach. Cement renders and modern impervious plasters trap moisture and make damp and timber decay worse, so we use sympathetic, consent-compliant repairs and treat the cause.

Could the chalk and the River Misbourne be causing my damp?

It depends where you are. The Chiltern chalk on the hill drains freely, so up there damp is usually penetrating or condensation. Down in the valley, Old Amersham sits on the floodplain of the Misbourne, a chalk stream that can see groundwater emerge and the river overflow after heavy rain, so valley-floor property can take in ground damp and below-ground water. A survey establishes which is at work.

How much does damp proofing cost in Amersham?

It depends on the cause, how much of the property is affected, access, and whether replastering or waterproofing is needed, so there is no honest one-size figure. After a survey we provide a clear, itemised written report so you know exactly what the work involves and what it costs before deciding anything.

Is the work guaranteed?

Yes. Our installed damp proofing and waterproofing work is backed by a written 10 year guarantee, which is transferable if you sell and is accepted by solicitors and lenders during a sale.

Book a Damp Survey in Amersham

Get the real cause of your damp diagnosed by a specialist who understands Amersham property, from Old Amersham's listed homes to the Metro-land semis on the hill, with a clear written report and honest advice.

Call 0300 373 7251 Request a Survey →

Last updated June 2026 · Advanced Damp Ltd · Damp proofing in Amersham, Buckinghamshire · 0300 373 7251

Call 0300 373 7251