The prices in this cost guide are accurate as of 2026*
Damp is a common issue for homeowners across the UK. It causes unpleasant smells, damages plaster, and can affect your health. Ignoring the signs often leads to more expensive repairs later.
In 2026, the cost to fix damp varies by the severity and type of the problem. This guide outlines the average prices for treatments, surveys, and repairs to help you budget effectively.
How much does damp proofing cost?
Rising damp occurs when ground water moves up through your walls. The most common solution is a chemical damp proof course (DPC) injection.
The average damp proofing cost depends on the size of the treated area.
- DPC injection (per metre): £45 – £75
- Single wall treatment: £280 – £500
- Whole house (terraced): £400 – £800
- Whole house (semi-detached): £600 – £1,200
You may also need to re-plaster the internal walls after the treatment. This can add £40 to £60 per square metre to the total bill.
What is the cost of a damp survey in the UK?
Diagnosing the root cause of dampness is difficult. A specialist survey identifies whether you have rising damp, penetrating damp, or condensation.
The typical cost of a damp survey in the UK ranges from £150 to £350.
Some contractors offer a free survey if you hire them for the repair work. However, an independent survey often provides a more impartial report. This is essential if you are buying a new property.
How much does it cost to tank a cellar in the UK?
Tanking is the process of waterproofing a cellar or basement to make it habitable. It involves applying a waterproof slurry or membrane to the walls.
The cost of tanking a cellar is significant due to the labour and materials involved.
- Tanking slurry (per m²): £40 – £80
- Cavity drain membrane (per m²): £50 – £100
- Small cellar conversion: £1,200 – £3,000
When calculating how much it costs to tank a cellar in the UK, remember to factor in extras. You may need a sump pump to remove water, which costs between £1,500 and £2,500 installed.
What is the woodworm treatment cost?
Damp timber attracts wood-boring beetles. If you spot small holes in your floorboards or joists, you likely have woodworm. Treatment usually involves spraying a chemical insecticide.
The woodworm treatment cost depends on access and the number of rooms affected.
- Single room treatment: £400 – £600
- Whole house treatment (3-bed): £1,000 – £1,500
- Roof void treatment: £500 – £800
Severe infestations may require replacing structural timbers. This requires a joiner and will increase the price.
How much does general damp treatment cost?
Penetrating damp is caused by water leaking through walls or roofs. Fixing the source of the leak is the priority.
The general damp treatment cost varies based on the repair needed:
- Replacing a roof tile: £100 – £200
- Cleaning gutters: £40 – £70
- Installing air bricks (for ventilation): £150 – £250
- External water repellent sealant (per wall): £200 – £400
Improving ventilation is often the cheapest way to solve condensation issues. Installing a simple extractor fan can cost as little as £250.
Why is it important to use a specialist tradesperson from Rated People?
Damp can be tricky to diagnose correctly. Misdiagnosis leads to wasted money on treatments that do not work. You need an expert who understands moisture control and structural integrity.
Rated People connects you with vetted preservation specialists.
- Qualifications: Look for PCA (Property Care Association) members on our platform.
- Guarantees: Many pros offer long-term guarantees on damp proofing work.
- Local knowledge: Find experts who understand the housing stock in your area.
- Genuine reviews: Read feedback from other homeowners to ensure quality service.
Hiring a specialist ensures the damp is gone for good, protecting your home’s value and your family’s health.
With Rated People, you have the power to get it done. Find a trusted, local tradesperson today.
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