Blog>Cost Guides>Damp proof course: Cost breakdown 2026
Last updated: 6 April 2025
Damp proof course: Cost breakdown 2026
We outline the typical cost of a damp proof course, the different types available, and the factors that can affect pricing.
Fast Facts
Damp course costs (injections) are around £2,000 for a medium-sized property
Interior walls average around £100 per metre of wall treated
A damp proof course can last for 20 years
A damp proof course (DPC) is a vital part of protecting your home from rising damp and tends to cost around £2,000 for a medium-sized property (based on injection treatments).
Here, we explain:
What a damp proof course is
The different types available
How much a damp proof course might cost for your property
You'll also find helpful information on spotting the signs of rising damp, maintaining your DPC after installation, and how to find trusted damp-proofing specialists near you.
How much does a damp proof course cost in 2026?
A damp proof course is a barrier installed in the walls of your home that protects it from moisture rising up from the ground (aka, rising damp).
The cost of a damp course is dependent on various factors, including the type of DPC (read on for more detailed information on this), the severity of the damp, and the size of your home.
| Cost provided item | Cost + VAT (Lower range) | Cost + VAT (Higher range) | Average cost |
|---|---|---|---|
| Terraced house (damp proof membrane) | £2,000 | £4,000 | £3,000 |
| Semi-detached house (damp proof membrane) | £3,000 | £5,000 | £4,000 |
| Detached house (damp proof membrane) | £4,000 | £6,000 | £5,000 |
| Labour costs | £250 | £320 | £280 |
| Terraced house (injection damp proofing) | £800 | £1,200 | £1,000 |
| Semi-detached house (injection damp proofing) | £1,500 | £2,500 | £2,000 |
| Detached house (injection damp proofing) | £2,000 | £5,000 | £3,000 |
| Last updated: December 2024 Our costs are ballpark averages - get a local tradesperson to quote now | |||
On average, damp course costs tend to be around£2,000 for a medium-sized property. This is based on injection treatments rather than a damp proof membrane, which often works out more expensive as a retrofit option.
These prices exclude:
Removing and/or making good any plasterboard or render
Decoration or finishes, e.g. skirting boards/floor finishes
Drying out or dehumidifying
The cost of a damp proof survey
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Damp proof course cost by type
As we touched on earlier, there are several rising damp solutions available to UK homeowners. We'll outline the main options, below, with an indication of the expected cost of each.
1. Damp proof course injection cost
A water repellent barrier is created by injecting a silicone-based liquid into the brickwork. This reacts with the silica in the masonry creating a layer that prevents rising damp.
It's particularly effective for homes with porous brickwork and typically costs around £2,000 for a semi-detached home.
2. DPC chemical treatment cost
A chemical solution is injected into the walls to create a moisture barrier. It's a cost-effective option, but is not always appropriate for older buildings. It tends to cost around £2,000.
Generally speaking, injection treatments are usually preferred for retrofit or damp problems as they're simpler (and more cost effective) to implement than damp proof membranes, for example.
3. Physical damp proof membrane cost
A damp proof membrane is a layer of waterproof material that's embedded into the wall during construction. It's ideal for new builds and - when properly installed - creates a permanent and robust solution to prevent rising damp.
Retrofitting damp proof courses or membranes can be difficult, structural, and costly. As a retrofit, expect to pay, on average, £4,000for damp proof membrane installation on a semi-detached property.
4. Electro-osmotic DPC cost
A non-chemical alternative using copper or titanium wiring. This method uses electric charges to repel moisture from the walls.
It's often used in properties where other types of DPC are impractical or less effective. Electro-osmotic DPC costs around £1,000.
5. Vertical DPC cost
This type of DPC is used to stop moisture transferring sideways between neighbouring walls and surfaces. On average, vertical DPC treatment tends to cost around £1,000.
6. Cost of ceramic tubes
Special ceramic tubes can be inserted into the walls to absorb and then evaporate damp. This is best for historic or listed buildings where non-invasive methods are needed.
Expect to pay in the region of £125 per metrefor this type of DPC.
7. Magnetic field DPC cost
An advanced technique that uses a magnetic field DPC to stop the passage of water up a wall. It's best for properties where chemical or physical barriers are not suitable. It tends to cost around £1,000.
8. Tanking slurry cost
Tanking slurry is a waterproof coating applied to walls. It's often the best option for areas with high water exposure, such as basements or cellars.
On average, tanking a cellar or basement costs around £125 per sqm.
Get a quote for rising damp treatment cost
As you can see, there are several types of DPC with varying suitability and individual price points.
Book a trusted local damp proof specialist to inspect your walls, check the existing damp course, and recommend how best to fix the rising damp issue in your home.
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Damp proofing course cost per project
As we touched upon earlier, injection damp proofing is often cheaper than retrofitting a damp proof membrane due to the complexity of the process.
As a guide, here's what you can expect to pay - on average - for these two types of DPC in various-sized properties:
Retrofitting a damp proof membrane
Terraced house: £3,000
Semi-detached house: £4,000
Detached house: £5,000
Injection damp proofing
Terraced house: £1,000
Semi-detached house: £2,000
Detached house: £3,000
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Factors affecting damp proofing course costs
Several factors can influence the cost of DPC, which we'll outline below:
The extent of the damage
Unfortunately, damp can sometimes be left untreated, which is not only bad for your health, but also for your property. The longer the damp persists, the more damage it can cause, and the more expensive the solution is likely to be.
Property size
It goes without saying, that the larger the scale of the problem, the more you'll pay in both material and labour costs to fix rising damp. The earlier rising damp can be treated, the better.
Type of damp proof course
Rising damp treatment costs will also vary depending on the DCP solution you choose. An experienced damp proof specialist will explain the options and recommend the best remedy for your home.
Internal or external walls
When damp proofing interior walls, you might spend around £100for every metre of wall treated.
If you're damp proofing exterior walls, you can expect to spend a bit more as there are more processes to consider. For example, if the rising damp was caused because the exterior ground level rose above the DPC in the wall, you will also need to lower the ground level.
For a small house, expect to spend an average of £450 per metre digging the soil and laying gravel on it. On the other hand, if you prefer to lay a concrete path around the house, the damp proofing cost could go over £2,000 per metre.
Your location
One final point to note is to be aware of regional variances in labour rates, which can ultimately affect the amount you are quoted for a damp proof course.
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Hidden costs to consider
The figures outlined in this guide are for DPC installation costs only. They do not include additional costs often associated with damp proofing work, such as:
Removing damaged plaster or render
Replastering and redecoration
Or any other related costs
Ensure you get a selection of quotes and ask that they are itemised so it's clear what's included and what you need to budget for as extra.
Independent damp survey
In some cases, you may wish to hire an independent surveyor to undertake a damp survey. This will help to accurately pinpoint the cause of the damp and help to recommend the best course of action to fix it.
A damp survey normally costs in the region of £100-£600, but as a result, you could save money on unnecessary procedures or time wasted in finding the source.
Damp proofing day rates
Although some tradespeople will include their labour in their damp proof course cost, expect to pay an average day rate of £300 for installation.
This typically includes the tanking slurry, re-plastering, and re-rendering required. A damp proof course can take between 1-4 days.
Damp course quote
To ensure you get a fair and competitive cost for your damp proof course, we recommend getting prices from three or more damp proof companies in your area. Do this quickly and easily via our request a quote feature.
Alternatively, view damp proof company profiles, read customer reviews, and contact them directly using our search option below.
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Cost of hiring vs DIY
You may be wondering whether it's possible to tackle damp proofing as a DIY task.
The decision largely centres on the extent of the problem, your DIY capabilities, and the materials needed.
DIY: Some minor damp issues can be addressed with cheaper DIY solutions such as damp-proof paint. However, this is a temporary fix that won't deal with the root cause of the problem.
Hiring a professional: A damp proof specialist brings expertise, appropriate materials, and guarantees on their work. While the initial cost will be more than a DIY solution, professional treatment will ensure long-lasting results and help to avoid costly mistakes.
Rising damp can cause serious structural damage to your property; we always recommend hiring a professional damp proof company.
Damp proof course cost checklist
Before committing to a damp proof course (DPC), it's important to factor in all the project costs to avoid any unnecessary surprises. Here's a quick checklist to help you budget effectively:
The type of DPC you choose will impact the cost, for example, membrane, injections, or electro-osmotic systems
The size of the affected area will also influence the price
The extent of the damage - often, plastering or structural repairs are also necessary
Labour costswill vary up and down the country, but as a guide, day rates tend to be around £300
Additional treatments such as anti-mould solutions, or improvements to ventilation, might be necessary
Find a damp proof specialist near you
Find a trusted damp proof company that covers your local area. Simply search your postcode to get started.
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What is a damp proof course?
A damp proof course (DPC) is a barrier installed in the walls of your home that protects it from moisture rising up from the ground (aka, rising damp).
Without it, moisture can seep into the foundations, floors, and walls of your home, causing structural damage, mould, peeling paint, and a host of other damp-related problems.
There are three main types of damp - each of which has its specific causes and treatments:
Condensation
Penetrating damp
Rising damp
A damp proof course is specifically designed to protect a property from rising damp.
If your property is suffering from condensation or penetrating damp, head over to our damp proofing cost guide, which outlines the best way to tackle these issues.
What does a damp proof course look like?
All homes built after 1875 should have a damp proof course - this is when it became a compulsory building regulation.
You can find it by checking the outside of your house and locating a seal that runs horizontally across the brickwork. It usually sits about 6 inches up from ground level.
However, there are several types of damp proof courses including an injection, a physical damp proof membrane, chemical damp proofing, and electro-osmosis.
Why might you need a damp proof course?
A damp proof course should last for around 20 years or more, but it's not immune to wear and tear.
It can fail due to poor quality installation or deterioration caused by external factors.
In an older building, there may not be a damp proof course at all - one will need to be retrofitted if damp becomes an issue.
How to identify if your home needs a DPC
Rising damp can often go unnoticed until the damage becomes significant. Keep an eye out for these signs to help spot and deal with the problem as soon as possible:
Damp patches: Particularly along the lower sections of walls
Peeling paint or wallpaper: This can sometimes be caused by trapped moisture underneath
Musty odours: Often a sign of lurking mould or damp
Crumbling plaster or brickwork: Caused by prolonged exposure to moisture
Tips for preventing damp in your home
Even with a damp proof course installed, there are steps you can take to help protect your home from damp and mould:
Maintain gutters and drains: Keep gutters and drains free of leaves and debris so they can do their job of directing water away from your home and into the drain
Ensure proper ventilation: In moisture-prone rooms especially, use an extractor fan or open windows to allow vapour to escape rather than settle on surfaces
Check external walls: Fill any cracks or gaps to prevent water from penetrating
Prevent damp in your home: practical tips you need to know
Damp is a word that homeowners, quite rightly, have come to dread. Damp can cause significant damage to your home and seriously affect the health of all members of your household.
FAQs
What is the cost of a damp proof course for a 3-bed semi?
On average, damp course costs tend to be around£2,000 for a medium-sized property.
What's the cheapest way to fix rising damp?
Depending on the extent of the problem and the suitability of the treatment, the cheapest way to fix rising damp is often with injections.
What is DPC in construction?
In the building industry, there are various types of damp proof course (DPC) available including a damp proof membrane, injections, chemical solutions, and electro-osmosis.
How do I find a damp course?
Find your DPC by looking at your external walls. The damp course should sit 6 inches up from ground level. It will look like a thin black line that runs horizontally across your walls.
What is the difference between a DPC and a damp proof membrane?
A damp proof course (DPC) is a horizontal barrier installed in walls to block rising damp. A damp proof membrane is a type of DPC. It's a sheet of waterproof material placed under floors or on walls to prevent moisture from rising up into the structure of a building.
Who should install a damp course?
Although people with the right skills can do it themselves, we always recommend hiring a professional to damp proof your home.
How long does damp proofing take?
Depending on the scale of the job, damp proofing usually takes between 1-4 days.
How long does a damp course last?
When done properly, a damp proof course should last for 20 years or longer.
Can a damp proof course fail?
Yes, improper installation or damage to the DPC can unfortunately lead to it failing.
Can you install a damp proof course yourself?
Some DIY kits are available, however, installing a DPC yourself can be challenging and could lead to further (more costly) problems further down the line if not done properly.
Can rising damp damage be fixed without a DPC?
Minor cases of rising damp can sometimes be managed temporarily with better ventilation or water-repellent coatings. However, a DPC will prevent the problem from worsening, providing a reliable, long-term solution.
Is rising damp covered by home insurance?
Unfortunately not. Home insurance does not normally cover damp for internal or external walls, but it's worth checking with your policy provider to be sure.
Are there any grants available for damp proofing in the UK?
There are grants available for damp proofing in the UK, particularly for low-income or vulnerable homeowners. It's worth contacting your local authority to find out if you qualify for assistance.
Is there a difference when it comes to damp proofing a basement?
Yes, there is. Generally, a damp proof course is used to protect a property above ground. This stops the damp from rising up and causing further damage to the property. Because a basement sits below ground level, basement flats normally require 'tanking' which consists of applying a membrane, slurry, or paint to the walls.
Tanking can be more expensive than a standard damp proof course membrane because of the labour and materials involved.
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