Survey-led damp proofing across London & the UK
Damp Proofing Specialists
Damp problems need correct diagnosis before any treatment. Every job we do starts with a professional damp survey, so we treat the real cause and deliver a lasting fix, not guesswork. Backed by our 20-year guarantee.
Over 30 Years
Diagnosing and treating damp in homes and commercial property.
FODCS Surveyors
Qualified surveyors, not salespeople, diagnose every job.
20-Year Guarantee
Written guarantee on our damp proofing treatments.
Survey Fee Deducted
The survey fee comes off the cost of works if you proceed.
What Is Damp Proofing?
Damp proofing is the process of stopping unwanted moisture from getting into the walls, floors and structure of a building, and putting right the damage it has caused. It covers a range of treatments, from installing a new damp proof course to control rising damp, to repairing external defects that let water in, to managing condensation. The right treatment depends entirely on the type and cause of the damp, which is why a proper survey always comes first.
What Is a Damp Proof Course (DPC)?
A damp proof course, or DPC, is a continuous waterproof barrier built into the walls of a property to stop ground moisture rising up through the structure. Older properties may have a failed DPC, or none at all, which is the most common cause of rising damp. Where this happens, we install a new chemical DPC by injecting a water-repellent cream or fluid into the mortar course, forming a fresh barrier that stops moisture travelling upwards.
The most important step is diagnosis. Staining, mould and peeling plaster can each have several different causes, and treating the wrong one is the main reason damp comes back. A survey identifies the true cause before any work is recommended.
The Types of Damp We Treat
Damp is not one single problem. The three main types need very different treatments, and correctly telling them apart is where most DIY and non-specialist fixes go wrong.
Rising Damp
Ground moisture rising up through walls where the damp proof course has failed or is missing. Treated with a new DPC and replastering.
Rising damp treatment →Penetrating Damp
Water entering laterally through walls from outside, usually due to a defect such as failed pointing, render or guttering.
Penetrating damp treatment →Condensation & Mould
Moisture in the air settling on cold surfaces, leading to black mould. Treated with ventilation and moisture management, not a DPC.
Condensation & mould →For below-ground water in basements and cellars, the right answer is structural waterproofing rather than damp proofing. See basement waterproofing.
Our Damp Proofing Treatments
We offer a full range of solutions, specified only after a survey has confirmed the cause.
Chemical DPC Injection
A new damp proof course injected into the mortar to stop rising damp at its source.
Damp Proof Membranes
Membranes applied to walls or floors to isolate the structure from residual moisture.
Specialist Replastering
Salt-retardant render and plaster systems to repair walls and prevent salt staining returning.
External Repairs
Fixing the external defects behind penetrating damp, such as pointing, render and rainwater goods.
Ventilation Systems
Extraction and positive input ventilation to control condensation and humidity.
Timber Treatment
Treating wet rot, dry rot and woodworm where prolonged damp has affected timber.
How Our Damp Proofing Works
We follow a structured, assessment-led process so the right solution is applied first time.
Professional Survey
An experienced surveyor inspects the property, measures moisture and identifies the type and cause of damp.
Clear Diagnosis
You receive a plain explanation of the findings and a treatment plan based on the root cause, with a fixed price.
Remedial Works
Work is carried out only where needed, fully in line with the survey, and backed by our guarantee.
Not sure what is causing your damp?Use our free 60-second damp checker for an instant indication before you book.
Try the Damp CheckerHow Much Does Damp Proofing Cost?
Cost depends on the type of damp, the size of the affected area and whether replastering is needed. The figures below are typical UK guide prices. We always confirm a fixed price after a survey, and the survey fee is deducted from the cost of works if you go ahead.
Backed by a 20-Year Guarantee
Two decades of documented protection
A correctly installed damp proof course is a permanent remedy. Our damp proofing treatments come with a written 20-year guarantee, giving you long-term confidence in the work and a clear record for your property.
For added peace of mind, an insurance-backed guarantee is available as an option on request. It is not included as standard, and where you have taken it, it can transfer to a new owner if you sell, supporting your property's value at resale.
Why Choose Advanced Damp
What Our Customers Say
The damp problem was completely resolved
"Advanced Damp carried out a damp survey and then completed the recommended damp proofing works. The treatment was explained clearly beforehand and the damp issue has now been fully resolved. Professional from start to finish."
Proper diagnosis and the right treatment
"After years of recurring damp, Advanced Damp identified the cause and carried out the correct damp proofing treatment. The work was completed efficiently and the result has been excellent."
Accredited & Trusted
Damp Proofing FAQs
What is damp proofing?
Damp proofing is the process of stopping unwanted moisture entering the walls, floors and structure of a building, and repairing the damage it has caused. It covers several treatments, including installing a new damp proof course for rising damp, fixing external defects behind penetrating damp, and controlling condensation. The correct treatment depends on the type and cause of the damp, established by a survey.
What is a damp proof course (DPC)?
A damp proof course is a continuous waterproof barrier within the walls that stops ground moisture rising up through the structure. When an older property has a failed DPC, or none at all, rising damp results. We install a new chemical DPC by injecting a water-repellent cream or fluid into the mortar course to form a fresh barrier.
How does damp proofing work?
It starts with diagnosis. A surveyor identifies the type and cause of the damp, then we apply the matching treatment, a new DPC for rising damp, external repairs for penetrating damp, or ventilation for condensation. Treating the correct cause is what makes the fix last, which is why we never prescribe works without a survey first.
How much does damp proofing cost?
Costs vary with the size of the property and the extent of the problem. As a guide, chemical DPC injection typically costs between 70 and 120 pounds per metre, treating rising damp in a single room with replastering is often between 1,000 and 2,500 pounds, and a whole-house damp proof course usually falls between 3,000 and 6,000 pounds. We always provide a fixed price after a survey.
How much is a damp proof course for a whole house?
A whole-house damp proof course in the UK typically costs between 3,000 and 6,000 pounds or more, depending on the size of the property, how many walls are affected and the amount of replastering required. The only way to get an accurate figure is a survey, after which we provide a fixed price.
How long does damp proofing last?
A correctly installed damp proof course is a permanent remedy and does not need redoing under normal conditions. For your confidence, our damp proofing treatments are backed by a written 20-year guarantee.
How long does damp proofing take?
Most rising damp treatments are completed within a few days, depending on the number of walls and the amount of replastering. Replastered areas then need time to dry out fully before redecoration. Your surveyor will give you a clear timescale with your treatment plan.
Is damp proofing guaranteed?
Yes. Our damp proofing treatments carry a written 20-year guarantee. An insurance-backed guarantee is also available as an option on request. It is not included as standard, and where you have taken it, it can transfer to a new owner if you sell the property.
Can you claim damp proofing on house insurance?
In most cases no. Standard buildings insurance usually treats rising damp and condensation as maintenance issues rather than insured events, so they are not normally covered. Damage from a sudden, accidental escape of water may be a different matter. It is always worth checking the specific terms of your own policy.
Do I need a survey before damp proofing?
Yes, and it matters more than anything else. Damp symptoms can have several different causes, and treating the wrong one is the main reason damp returns. A survey confirms the true cause so the correct treatment is applied first time. The survey fee is deducted from the cost of works if you proceed.
Related Services
Damp proofing across London, Birmingham, Oxford, Reading, Milton Keynes and the surrounding areas.
Get the Cause Diagnosed Properly
Book a damp survey and a qualified surveyor will identify the real cause and give you a fixed-price treatment plan. The survey fee is deducted from the cost of works if you proceed.