Put a stop to the moisture. Find out how much wet treatment and damp proofing typically cost.

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A damp issue may be expensive to fix. Here, we examine average damp treatment and damp proofing expenses as well as professional guidance to ensure that you don’t end up spending more than is necessary. Although damp proofing can be quite disruptive and cost thousands of pounds, some types of damp can be remedied for very little money or even for nothing.

What is the price of damp proofing?

The Royal Institution of Chartered Surveyors (RICS), which publishes average building work and repair costs, has collaborated with us to bring you the average cost for a variety of different damp treatments, from repairing a damp-proof course with silicone to installing an entirely new damp-proof membrane.

We’ve included prices for terraced, semi-detached, and detached homes as well as the expenses for treating just one wall or one area to give you a more accurate picture of how much certain treatments might cost you. Remember that prices will vary depending on where you live because they are regional.

The tables below provide an estimate of the cost for some common remedies for increasing and penetrating damp.

Take a look at our sections on dealing with how to stop condensation, rising damp, and penetrating damp before deciding which sort of treatment you require so that you can completely grasp what each treatment entails and the situations it would be utilised for.

You’ll be able to make the best decisions for your house and save money as a result.

The current damp-proof course is below ground level, which is a problem.

Remove as much soil as is required during excavation to guarantee that the ground level is at least 15 cm below the damp-proof course.

Problem: Because the damp-proof course is damaged or absent, walls are moist at a low level.

Solution: Insert new damp-proof course or use silicone to create a damp barrier. Two courses of brickwork will be removed in order to insert a bitumen-coated hessian damp-proof course and add a new damp course (DPC). The brickwork will then be repaired, including the mortar pointing, to restore its previous appearance.

A cavity wall is being penetrated by wet.

Clean out any cavities that are plugged. From the outside, this can be done by removing three bricks, cleaning out any mortar splatter or plugged cavities, and then replacing the bricks with new ones that match the rest of the wall.

The issue is that damp is permeating walls at various heights, around windows and doors, and even at ceiling height.

To prevent dampness, insert a moisture proof course at various levels into the walls. Options include a hollow tray, which prevents water from penetrating the inner wall from the exterior. To install a cavity tray or damp-proof barrier, bricks must be removed, replaced, and made to match the existing brickwork.

Problem: Because outside surfaces are damaged, wetness is invading the walls.

Apply waterproof paint to exterior walls to prevent dampness from penetrating. This can be painted on surfaces made of rendered brick, concrete, and mortar.

Internal walls are moist, a problem.

Solution: “tank” the walls with damp-proofing material to “close” them.

Asphalt, a viscous liquid, is the material used to seal the walls in the prices below.

The costs cover ripping away the old plaster, cleaning up the brick/blockwork joints, putting three layers of asphalt tanking on the walls, rendering them with cement and sand, reattaching or installing new skirting boards to match the old ones, and painting the walls.

Issue: wet floors

The answer is to “seal” the floor with damp-proofing material (often referred to as tanking).

Bitumen-coated polyethylene membrane and mastic asphalt tanking are the two alternatives. The flooring, screed (the concrete under the floor), and skirting must all be removed from the room for the two jobs priced below.

Before reinstalling the screed and reattaching the skirting boards, two layers of asphalt tanking or a bitumen-coated polyethylene membrane and priming are applied.

Problem: Wet walls in the kitchen or bathroom

Install an extractor fan in an exterior wall as a solution.

Cost data for damp-proofing

RICS uses cost information from its Building Cost Information Service (BCIS) database, which compiles and analyses costs from various sources, to determine the aforementioned average pricing.

Everything required to complete the work, including labour, materials, any necessary preliminary work, contractor overhead and profit, and VAT, is included in the pricing. The most competitive national average is revealed by benchmarking the best trade prices from a variety of suppliers across the UK.

The existing Building and Allied Trades Joint Industrial Council wage agreement is the foundation for labour rates. The typical double glazed window and door types and sizes are then determined by RICS using a standard methodology based on this data. RICS 2020 data copyright; reprinted with permission. According to data as of October 2021.

Avoid paying for pointless damp treatment.

There may be more than one answer to the difficult problem of damp. You might not need the most expensive treatment, or you might be able to perform a low-cost DIY procedure.

For instance, condensation damp can easily be resolved by simply opening windows more frequently, refraining from indoor clothes drying, turning on the heat more frequently, constructing vents, or installing bathroom and kitchen extractor fans.

Even something as easy as cleaning your gutters can assist with penetrating damp. Numerous individuals have shared their experiences tackling damp issues on their own, particularly condensation and various varieties of penetrating damp. One person said, “I unblocked the gutter myself.”

The task took ten minutes. Another person remarked, “I could fix that myself. It was just a simple matter of a tile that had fallen loose.” The most expensive sort of damp to repair is rising damp.

It’s fortunately one of the less frequent types of wet. It’s important to monitor your damp issue so you can identify potential causes without allowing it get out of hand (damp can cause major damage to building structures).

Before calling in a professional, you may utilise this time to test out a few affordable or free remedies.

professionals in professional damp-proofing

If you do decide to hire a professional, acquire estimates from at least three different firms (some charge for a damp report, but you get money back if you hire the firm), and if the work proposed is inconsistent, seek advice from an independent damp specialist.

You may then sift out any businesses that try to charge you more than required and determine whether the therapy is actually necessary.