Extensions such as garage conversions will usually require supplementary damp proofing to be installed through the conversion, as the pre-existing garage will often have a single skin design for walls and floors, which was not designed to conform to building regulations for habitable rooms. This damp proofing will have to be added to walls and floors. Furthermore, the roofing of the garage conversion will require water proofing. The damp proofing for the floor of the garage conversion will usually be achieved by 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 if the floor will be a solid or a floating floor. In some garages, the walls will have already been damp proofed, but this might have to be improved as part of the conversion to be able to comply with current building regulations. The walls should be damp proofed in order to protect the brickwork from rotting slowly as moisture sets in. This is accomplished by either making use of damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls already present in the garage. Damp proofing is an integral part of the building regulations that the garage conversion should adhere to, therefore is it necessary to ensure that your garage conversion employs 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
| Avg. price low | Avg. price low |
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| Avg. price | Avg. price |
| Avg. price high | Avg. price high |
£1900
£1425
£950
£475
£0
| Labour cost | £1,050 | |
| Material cost | £375 | |
| Waste removal | £75 |
Requests for quotations in St Neots in June 2026
Requests for Damp proofing quotations in St Neots in June 2026. 0% change from May 2026.
Requests for Damp proofing quotations in Cambridgeshire in June 2026. 0% change from May 2026.
St Neots serves as a town and also civil parish within the non metropolitan district of Cambridgeshire, England, within the old county of Huntingdonshire, near the Bedfordshire county perimeter. It sits on the River Great Ouse inside the Huntingdonshire District, 15 miles (24 km) west of Cambridge and 49 miles (79 km) north of central London. St Neots is the leading town in Cambridgeshire (Cambridge and Peterborough both are cities) having a population of 30,580.
St. Neots - PE19
Enquiry from: Paul J
Start Date: Immediate
i need three walls damp proofing. are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: detached please call to appoint
St. Neots - PE19
Enquiry from: Shay P
Start Date: Immediate
Hi, I have mould growth as per the image in corners of the room and I feel there is dampness internally also. I would like to arrange for someone to come and see the issue and advise what treatment wo...
St. Neots - PE19
Enquiry from: Kelly R
Start Date: Immediate
Water coming in. I’ve only noticed it when it rains.
St. Neots - PE19
Enquiry from: Rhys H
Start Date: Immediate
Concerns raised around damp following house survey on a number of walls. Wallpaper is peeling away from one wall in the bedroom caused by damp l. Previously been damped proof but date is unknown, ...
St. Neots - PE19
Enquiry from: Rita E
Start Date: Immediate
we would like an expert to do an inspection of the property are you the property owner: tenant (with permission) how many rooms do you need damp proofing: 3-4 rooms property type: other please call t...
St. Neots - PE19
Enquiry from: Tina C
Start Date: Immediate
Inside wall and boiler cupboard wall. (No boiler in cupboard now)
St. Neots - PE19
Enquiry from: Darren H
Start Date: Immediate
we have damp issues in the house and need to identify remediation methods in order for the problem to be solve. it appears to be penetrating damp from an externally rendered wall are you the property...
St. Neots - PE19
Enquiry from: Darren H
Start Date: Immediate
A Damp Survey to be undertaken to determine what remedial works should be considered
St. Neots - PE19
Enquiry from: Nick L
Start Date: Immediate
Need to find out cause of damp in living room.
St. Neots - PE19
Enquiry from: Caroline F
Start Date: Immediate
unsure. extension gets damp floor when an occlusive barrier placed on it. there has been mould on floor, wall, ceiling. are you the property owner: owner of the property how many rooms do you need da...
St. Neots - PE19
Enquiry from: Brenda P
Start Date: Immediate
To remove mould from top of bedroom window frame and bottom of bathroom window frame
St. Neots - PE19
Enquiry from: Courtny B
Start Date: Immediate
Remove mould from 1 room
St. Neots - PE19
Enquiry from: Graeme C
Start Date: Immediate
Downstairs external wall in lounge approx 6 meters long is damp into about 2 feet from the floor, needs to be rectified Are you the property owner: Owner of the property How many rooms do you need...
St. Neots - PE19
Enquiry from: Susan B
Start Date: Immediate
Suspected damp on wall in dining room Are you the property owner: Owner of the property How many rooms do you need damp proofing: 1-2 Rooms Property Type: Terrace Time scale: Immediate
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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!
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.
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.
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.
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