COST GUIDES
Damp proofing costs in the UK (2026 prices)
Updated 04/26
Average cost:
Around £5,000 for a typical property plus around £300 for a damp survey
Typical cost range:
Between £1,000–£3,000 for injection damp proofing or between £2,500–£7,500 to retrofit a new damp course
Key cost driver:
The type and severity of the damp determines the treatment needed, and therefore the cost
Damp is best treated sooner rather than later.
It's one of those problems that often starts small — a musty smell, peeling paint, or a dark patch on a wall — but can become a much more expensive issue if it’s ignored.
There are several types of damp, and the cost of damp proofing will depend on what's causing it, how widespread it is, and the most suitable treatment method for your situation.
This guide explains the typical damp proofing costs, common treatment options, and the practical things to budget for so you can plan with confidence.
The type of damp determines the treatment, and the treatment determines the cost.
How much does damp proofing cost in the UK?
In the UK, the average damp proofing cost typically sits at around £5,000, although smaller treatments can cost closer to £1,000–£3,000, depending on the type of damp and the area affected.
| Damp proofing costs | Cost + VAT (Range low - high) | Average cost |
|---|---|---|
| Damp proofing cost per metre (injection) | £60–£200 | £100 |
| Damp proofing course (physical damp proof course retrofit) | £2,500–£7,500 | £5,000 |
| Damp proofing external walls cost (injection) | £1,000–£3,000 | £2,000 |
| Damp proofing cellar / basement cost - tanking | £100–£200 per sqm | £125 per sqm |
| Injection damp proofing cost | £1,000–£3,000 | £2,000 |
| Chemical damp proofing cost | £1,000–£3,000 | £2,000 |
| Chimney damp proof course (labour and scaffolding not included) | £75 per roll | |
| Damp survey | £100–£600 | £300 |
| Last updated: March 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
Damp proofing costs can vary widely because different types of damp need different solutions. Some problems, such as condensation, may simply need improved ventilation, while others, such as rising damp, may require installing a whole new damp proof course.
For the prices in this guide, we have considered the following:
Prices exclude any removal of plasterboard or render
Prices exclude any making good of any plasterboard or render
Prices exclude any decoration or finishes, e.g. skirting boards/floor finishes
Prices exclude any drying out or dehumidification
Prices exclude any survey costs
Data verified by our professional estimators
Estimators are CIOB & RICS members
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Damp proofing costs at a glance
Average damp proofing cost: around £5,000 for a typical property
Typical injection damp proofing cost: £1,000–£3,000
Cost of a new damp proof course: £2,500–£7,500
Basement or cellar tanking cost: about £125 per sqm
Damp survey cost: usually around £300
Most important cost factor: the type and severity of damp
It's wise to tackle damp as soon as possible to prevent costly future problems, including structural damage, mould growth, and even health issues.
Types of damp and typical treatment costs
Damp generally falls into three main categories, each with its own causes and treatment methods.
Condensation
Condensation is the most common type of damp and often appears in kitchens, bathrooms, and poorly ventilated rooms.
It's a result of water vapour, for example, from showering, cooking, or drying clothes inside, falling on cold surfaces, making them wet. The moisture can then sink into walls, ceilings, and even floors causing damp, and if left for too long, mould.
Typical solution:
Improve ventilation
Install extractor fans
Use dehumidifiers
As a guide, installing an extractor fan typically costs around £300.
Once the issue has been resolved, consider applying a damp proof paint, and remember to crack open a window to allow moisture to escape when showering, cooking or drying clothes indoors.
Penetrating damp
Penetrating damp occurs when moisture enters a building from the outside through damaged brickwork, roofing, pipes, or gutters.
On occasion, internal bridging can occur. This is when debris forms a bridge within your wall cavity, giving water an access point to your home.
Typical solution:
Repair cracks or holes
Improve external waterproofing
In the case of internal bridging, remove the debris to prevent more moisture from entering your home
Typical treatment cost: around £2,000 for external wall damp proofing.
Rising damp
Rising damp occurs when moisture travels up through the walls from the ground, seeping into your home's foundations, floors, and walls. This can then cause structural damage, mould, peeling paint, and more.
All homes built after 1875 should have a damp proof course, but even so, it's not immune to wear and tear.
Typical solution:
Install a new damp proof course (a physical membrane)
Apply chemical injection treatment
Use paints, gels, waterproof plaster, or waterproof cement coatings
Typical treatment cost: around £2,000 for injection damp proofing in a medium-sized property.
In some situations, your neighbours having damp may affect your home. This is especially likely when you share a wall. In this case, it is wise to work with your neighbour to find and tackle the cause of the problem.
Damp proofing prices per project
Damp can affect different parts of a property in different ways. The cost of treatment often depends on where the problem is and how extensive the damage has become. Here are some common damp proofing projects and typical treatment costs.
Damp proofing external walls
To prevent or deal with penetrating damp, external walls need to be waterproof and free from cracks or damaged mortar. On average, damp proofing external walls costs around £2,000.
Injection damp proofing
One of the most common ways to treat rising damp is to inject a waterproof solution into the wall to create a protective barrier. On average, injection damp proofing costs around £2,000.
Chemical damp proofing
Chemical damp proofing uses specialist materials to form a moisture-resistant barrier within the wall. On average, chemical damp proofing costs around £2,000.
Damp proofing a chimney stack
Damp in chimneys can lead to staining, flaking paint, and persistent damp patches inside the home. Before damp proofing work begins, the underlying cause (such as damaged mortar, blocked flues, or missing roof tiles) usually needs to be addressed.
Once the root cause has been identified and fixed, you can have a damp proof membrane placed within the chimney or apply a special coating. A chimney damp proof course typically costs around £75 per roll, plus labour and scaffolding costs where required.
Damp proofing a cellar or basement
Cellars and basements are particularly prone to damp because they sit below ground level and are exposed to higher moisture levels. On average, damp proofing a cellar or basement costs around £125 per sqm.
Damp proofing cost per metre
In some cases, damp proofing work is priced based on the length of wall affected. The average price is typically around £100 per metre.
What affects the cost of damp proofing?
The cost of damp proofing is rarely determined by one single factor. Instead, it usually reflects the condition of your property and the amount of work needed to fix the root cause.
The key factors that influence the cost of damp proofing include:
Type of damp: rising damp treatments are usually more complex and expensive than condensation fixes
Severity of the problem: small patches are quicker and cheaper to treat than widespread structural damp
Size of the affected area: larger areas require more materials and labour
Access to the work area: difficult access, such as basements, chimneys or external walls, can increase labour time
Location of your property: labour rates are typically higher in London and the South East
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What should be included in a damp proofing quote?
A clear quote will help you understand exactly what work will be carried out and what you’re paying for.
Here's what should be included in a typical damp proofing quote:
Diagnosis of the damp problem
Labour and materials
Preparation work
Waste removal
Estimated completion time
Details of any guarantees or warranties
If anything is unclear, ask the contractor to explain it before work begins.
Additional costs to budget for
The main damp treatment cost is only part of the overall expense. Depending on the condition of your property, there may be additional work needed before or after damp proofing.
Some of the most common additional costs to budget for include:
Damp survey: often needed to diagnose the cause of damp and recommend the right treatment. Budget around £300
'Making good' after treatment: plastering, painting, or repairing surfaces after damp proofing work
Preventative measures: installing ventilation, extractor fans, or dehumidifiers to reduce future damp risk
Preparation work: removing damaged plasterboard or render before treatment begins
These costs are not always included in the initial quote, so it’s worth checking exactly what work is covered to help manage expectations and budget effectively.
How long does damp proofing take?
The time required for damp proofing depends on the cause of the damp and the size of the affected area.
As a guide, typical timeframes include:
Small localised damp treatment: often completed within a day
Injection damp proofing: usually one to two days
Installing a new damp proof course: may take several days
Basement or cellar tanking: can take longer depending on the size of the space
Drying time after treatment can also vary, especially if the walls have absorbed a lot of moisture. Your damp proof specialist should provide a clear timeline, and let you know what level of disruption to expect, once they've assessed the property.
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Damp proofing cost calculator
Our damp proofing cost calculator can be a helpful starting point if you want a rough idea of costs before arranging quotes.
Your final price will usually depend on the type of damp, the size of the affected area, and the treatment needed. For example, a small localised repair will cost far less than installing a new damp proof course or tanking a basement.
Job Estimate Calculator
This calculator provides a guide price only, not a quote.
Always arrange for a qualified local damp proof specialist to assess your property, identify the cause of the damp, and provide a written quote before you go ahead.
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Can you do damp proofing yourself?
Some minor damp issues — particularly condensation — can sometimes be managed without professional help. Small habits, such as improving ventilation or using a dehumidifier, can make a big difference.
However, structural damp problems such as rising damp or penetrating damp usually require specialist treatment.
Incorrect DIY work can allow moisture to return, leading to further damage and higher costs later on. For persistent or widespread damp, professional assessment is usually the safest approach.
Damp is one of those problems where most homeowners want reassurance that the job has been done right.
Damp proofing cost checklist
When should you speak to a damp proof specialist?
Unfortunately, damp isn't something that's likely to improve on its own. However, early action can prevent more extensive damage and help keep costs manageable.
It's therefore a good idea to get professional advice as soon as you notice signs of damp, which could include:
Persistent damp patches on walls
Peeling paint or wallpaper
Musty smells
Mould growth
Cold or damp-feeling walls
A good damp proof specialist can identify the type and cause of damp, recommend the most appropriate treatment for your property, explain what work is included in the quote and help prevent the problem from returning.
Find a damp proof specialist near you
If you’ve noticed signs of damp in your home, getting professional advice early can make a big difference.
Small problems are often quicker and less expensive to fix before they spread or cause structural damage.
Comparing quotes from a few local damp proofing specialists is usually the best way to understand the likely cost and the treatment options available.
Find damp proof specialists covering your local area
Enter your postcode to find a top tradesperson near you
Sherifi damp proofing specialist
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Damp ProoferCondensation ControlDamp InvestigationDry Rot TreatmentTimber TreatmentGarratt's Damp & Timber Limited
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FAQs
How much does damp proofing cost in the UK?
The average damp proofing cost in the UK is around £5,000, although smaller treatments such as injection damp proofing typically cost £1,000–£3,000.
What is the best method of damp proofing?
The best method depends on the cause of the damp. Rising damp usually requires a damp proof course or injection treatment, while condensation problems are often solved by improving ventilation.
Do dehumidifiers get rid of damp?
Dehumidifiers can help reduce moisture in the air and manage condensation, but they do not fix structural damp problems. If damp keeps returning, professional treatment may be needed.
Can I do damp proofing myself?
Some minor condensation issues can be managed with ventilation or moisture control. However, most structural damp problems require professional diagnosis and treatment to prevent long-term damage.
How much should damp proofing cost?
Typical damp proofing costs vary depending on the type of treatment. Injection damp proofing usually costs £1,000–£3,000, while installing a damp proof course can cost £2,500–£7,500.
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