30 year insurance-backed guarantee
30+ years of experience
Friendly, qualified team & competitive prices
No job too big or small | commercial & domestic
Trusted by:
Crown Preservation are a leading London-based property preservation company. We provide the best-in-class damp proofing London properties need.
We specialise in the treatment and prevention of damp, basement work, woodworm and timber treatments.
Our highly-trained team operates across London and the Home Counties – servicing both domestic and commercial properties with our damp proofing treatments.
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Crown Preservation
Get a quote or call for a free, no-obligation chat about the issues you're seeing.
BOOK A SURVEYWhat we do
From rising damp to basement excavations — diagnosis first, then the right remedy.
Diagnosis first, then the right treatment — carried out by our own in-house team.
30-year insurance-backed guarantee (most competitors have 20)
Big enough to handle the largest of jobs, but small enough to care
Our team is friendly and fully qualified and our prices are competitive
We have over 30 years’ experience in the business
FAQs
Not sure what you're dealing with? Start here — or get a quote and we'll diagnose it properly.
We would not recommend it. Incorrect preparation or the wrong product can lead to failure, water damage and costly remedial work. A CSSW qualified surveyor will make sure the right system is designed and installed correctly, and self installed work is not covered by our guarantee.
BS 8102:2022 recommends at least two forms of protection for a basement that will be used as habitable space. Your surveyor will confirm what your property needs after inspecting it.
Yes. We work on domestic and commercial properties across London and the Home Counties – no job is too big or small. Our commercial clients include Network Rail, Heathrow and Waitrose.
Book a survey or call 0207 412 8267 for a free, no-obligation chat about the issues you’re seeing.
Common signs include damp patches or tide marks on walls, peeling paint or wallpaper, black mould, a musty smell, and crumbling plaster or skirting boards. Because different types of damp need different treatments, the first step is a professional survey to identify the cause accurately.
Smaller domestic basements typically take one to two weeks. Larger commercial or new build projects can take longer. Your surveyor will confirm an exact timeline after the survey.
It depends on the cause and the extent of the damage. Some treatments are completed in a day or two; larger jobs involving replastering or structural repair take longer. Once we’ve surveyed the property, we’ll give you a clear timescale before any work starts.
Cost depends on the size of the space, ground conditions and which system is required. A free survey gives you an accurate, no obligation quote before any work begins.
Yes. Our work comes with a 30-year insurance-backed guarantee – ten years longer than the 20-year guarantee most competitors offer.
We work across London and the Home Counties, on both domestic and commercial properties. Our office is at 78 York Street, London, W1H 1DP.
The three main culprits are:
Condensation is the most common, caused by moisture in the air settling on cold surfaces. Rising damp travels up through walls from the ground, while penetrating damp comes through walls, roofs or windows from outside. Each requires a different treatment.
All of our basement waterproofing and tanking work comes with a 30 year insurance backed guarantee, along with a free radon gas test.
Damp proofing covers the treatments that stop moisture getting into the fabric of a building. The right treatment depends entirely on the cause of the damp, which is why an accurate survey comes first.
Basement waterproofing is the overall term for keeping a below ground space dry. Basement tanking is one method of waterproofing, using a coating, membrane or slurry applied directly to walls and floors. Depending on your property, we may recommend tanking alone or combined with a cavity drainage system.
All carried out by our own in-house team.
Not if the cause has been correctly identified and treated – which is exactly why we lead with diagnosis. Our work is covered by a 30-year insurance-backed guarantee, so in the unlikely event a treated problem returns, you’re protected.