Extensions such as garage conversions will typically require additional damp proofing to be added during the conversion, as the existing garage typically has a single skin design for walls and floors, which was not designed to be in accordance with building regulations for habitable rooms. This damp proofing should be put into walls and floors. In addition, the roof of the garage conversion will need water proofing. The damp proofing for the floor of the garage conversion will often be achieved by using a damp proof membrane. This membrane is available in either solid or liquid form. The damp proof membrane will be put down either on top of the existing concrete floor, below the new floor, or as part of both, depending on whether the floor will be a solid or a floating floor. In a few garages, the walls will have already been damp proofed, but this may need to be updated as part of the conversion to be able to adhere to current building regulations. The walls will need to be damp proofed to be able to safeguard the brickwork from rotting gradually as moisture sets in. This can be accomplished by either utilising damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls already present in the garage. Damp proofing is a part of the building regulations that the garage conversion should adhere to, therefore is it important to make sure that your garage conversion incorporates suitable damp proofing methods.
The average cost of Damp proofing is £1500. Costs vary based upon the materials and the organisation selected. The upper price range can be as high as £1725. The material costs are in general about £375
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| Avg. price | Avg. price |
| Avg. price high | Avg. price high |
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| Labour cost | £1,050 | |
| Material cost | £375 | |
| Waste removal | £75 |
Requests for quotations in Avon in June 2026
Requests for Damp proofing quotations in Avon in June 2026. 0% change from May 2026.
Requests for Damp proofing quotations in South West in June 2026. 0% change from May 2026.
Hello and welcome to my page. We are a Family run building business with over 20 years in the building industry. We offer a verity of services this includes: Damp proofing specialists, Bricklaying Landscaping Groundwork’s/ drainage Roof repairs Poi...
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The Hive Efficiency Group supply and install a range of products to both residential and commercial properties, designed to assist in making them more energy efficient and maintenance free for many years to come. From thermally effiecient wall c...
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Bath - BA1
Enquiry from: Helen S
Start Date: Immediate
Breach of damp roofing at base of stairs.
Radstock - BA3
Enquiry from: Thomas Y
Start Date: Immediate
A survery has identified widespread damp at ground-floor level and concerns that the existing damp-proof course may not be operating effectively. There are also indications of possible ongoing moistur...
Bristol - BS5
Enquiry from: William S
Start Date: Immediate
walls damp proof.. I've got rising damp in some places in my house
Bristol - BS16
Enquiry from: Anna D
Start Date: Immediate
Full house survey for a property we are buying. Property is a three bed terrace house. It doesn’t have a basement or a loft conversion.
Bristol - BS30
Enquiry from: Rianne S
Start Date: Immediate
Area of damp above tiled floor/tiled skirting in kitchen. Started a few weeks ago
Weston-Super-Mare - BS22
Enquiry from: Mahavir V
Start Date: Immediate
damp proofing(tanking) on a wall, 10-11 square Meters, which is against the hill.
Radstock - BA3
Enquiry from: Holly S
Start Date: Immediate
We have a damp area on an exterior wall in the kitchen and also an interior wall.
Bristol - BS4
Enquiry from: Shoba H
Start Date: Immediate
Peeling paint by door. Mould on anything left touching wall. Basement flat that was completely taken to brick and tanked when converted.
Bath - BA2
Enquiry from: Alice L
Start Date: Immediate
i've been in the house 3 years and i suspect when i viewed the property, a treatment/anti-damp paint was applied to disguise the problem. after moving in, a small section of damp appeared in a small a...
Weston-Super-Mare - BS23
Enquiry from: Sheema A
Start Date: Immediate
damp on a wall encroughing to the ceiling skirting board
Radstock - BA3
Enquiry from: Huw B
Start Date: Immediate
Gable end wall has damp issues
Radstock - BA3
Enquiry from: Jess B
Start Date: Immediate
We have a damp wall in a residents bathroom. We’ve have had a plumber come out as we believe it might have been pipe work but it’s not. We aren’t sure what the issue is, but believe it could ...
Bristol - BS37
Enquiry from: Jo W
Start Date: Immediate
We are buying the property and want to instruct the work to be carried out before or after we move in and the cost. We have a survey detailing the work. Outer wall mortar removed and replaced with lim...
Bristol - BS32
Enquiry from: Kathryn T
Start Date: Immediate
Free no obligation damp survey We have a wet patch appear on internal walls around the main chimney stack.
Bristol - BS16
Enquiry from: Stefan M
Start Date: Immediate
Hi - have noticed a small (ish) damp area near the back door of our house. Not really sure what's required so a survey as soon as possible would be great. Cheers!
Weston-Super-Mare - BS23
Enquiry from: ALAN P
Start Date: Immediate
Damp and mould around windows on outer walls
Bristol - BS34
Enquiry from: Neil B
Start Date: Immediate
It would appear I have an issue with mould. Can you please call on the number above to discuss. Do you do free surveys?
Weston-Super-Mare - BS23
Enquiry from: Carolyn A
Start Date: Immediate
Main concrete steps leading up to front door are letting water into the basement flat that is below them.
Bristol - BS37
Enquiry from: Nathan S
Start Date: Immediate
we have a damp patch in the middle of a bedroom wall but it backs onto our neighbours bathroom( which is where i think it's coming from) i just need to be sure first are you the property owner: owner ...
Bristol - BS11
Enquiry from: Vijith M
Start Date: Immediate
Damp proofing, clear the walls
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Signs of rising damp tend to be close to the ground, usually no higher than a metre. It usually works its way up walls in horizontal lines. Penetrating damp usually develops in patches and can often be much higher up. For more advice, speak to a damp proofing professional.
Damp is a serious problem, particularly if you live in an old property, because it can lead to structural damage. This will cost you big money and could be very dangerous, to yourself and the property. Take damp seriously and get it inspected and resolved as soon as you discover it!
You should make sure that all signs of damp have gone before you redecorate your walls. If you want to paint your walls with a water-permeable emulsion paint, you can usually do this after 1 or 2 months. For other types of decoration you should wait longer.
There are a few visible signs of damp, although it often goes undetected. However, in older or empty properties, this made become detectable through its smell. These include peeling paint and wallpaper, crumbling plaster, mould growth, black spots or spores on walls and ceilings, and rotting skirting boards and flooring.
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