Extensions such as garage conversions will often require additional damp proofing to be added during the conversion, as the existing garage will often have a single skin design for walls and floors, which was not built to be in accordance with building regulations for habitable rooms. This damp proofing will have to be put into walls and floors. Furthermore, the roof of the garage conversion will require water proofing. The damp proofing of the floor of the garage conversion will in most cases be achieved by employing 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 a few garages, the walls have been damp proofed, but this may need to be updated as part of the conversion in order to adhere to current building regulations. The walls will need to be damp proofed to be able to safeguard the brickwork from rotting slowly as moisture sets in. This can be done by either implementing damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls already present in the garage. Damp proofing is an important part of the building regulations that the garage conversion will need to comply with, therefore is it important to make sure 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 |
|---|---|
| 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 Humberside in May 2026
Requests for Damp proofing quotations in Humberside in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in Yorkshire & Humber in May 2026. 0% change from April 2026.
Welcome to Heatseal Insulation Ltd We are National Loft insulation and Damp Proofing specialists covering most of the UK. Our objective is to provide an outstanding & reliable service to all our customers offering the latest technology to the Dome...
Good advice, clear understanding of the problem and solution
Grimsby - DN32
Enquiry from: Noman H
Start Date: Immediate
Severe damp and mould widespredd in room
Hull - HU5
Enquiry from: Doug B
Start Date: Immediate
assess and quote remedial work to rectify damp problems at the address. could be separate factors. gable end wall allowing water in, one internal wall (possibly due to old pipe leak), and damp around ...
Bridlington - YO16
Enquiry from: Austin R
Start Date: Immediate
Water coming through patio doors on rear of house, suspect water coming through wall cavity
Bridlington - YO15
Enquiry from: Ruth A
Start Date: Immediate
Detached cottage - circa 200 years old. Damp and mould on inside walls. Would like to get external cladding redone but need damp problem solving first!
Withernsea - HU19
Enquiry from: Jane P
Start Date: Immediate
survey has shown damp on most walls, not sure where it's coming from, don't want a surprise re cost after moving, would like a quote and to know what type of damp were dealing with, if any. You will...
Beverley - HU17
Enquiry from: Svitlana P
Start Date: Immediate
The house appears to have damp in walls.
Barton-upon-Humber - DN18
Enquiry from: Carl F
Start Date: Immediate
Free survey needed as maybe areas of damp.
Driffield - YO25
Enquiry from: Sarah L
Start Date: Immediate
hi i have recently moved into this house and there are a few patches of paint flaking which i assume is moisture from brickwork. coul you quote to repair oradvise please ?
Withernsea - HU19
Enquiry from: Nokwanda L
Start Date: Immediate
I am purchasing a house and wanted to double check with a damp/mould specialist the condition of this property. There is a stain on a ceiling wall and upstairs windows have mould on the edges but I’...
Scunthorpe - DN15
Enquiry from: Linda C
Start Date: Immediate
damp on chimney breast needs to be looked at are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: semi detached please call to appoint
Brough - HU15
Enquiry from: Tony S
Start Date: Immediate
Damp in down stairs and bed rooms
Scunthorpe - DN16
Enquiry from: Annie F
Start Date: Immediate
Need quote for damp and condensation
Scunthorpe - DN15
Enquiry from: Chloe J
Start Date: Immediate
To be discussed on arrival
Withernsea - HU19
Enquiry from: Jen H
Start Date: Immediate
i have efflorescence on the outside of the conservatory, plus a patch coming through internally near the kitchen window. i would like a free damp survey to assess the problems please. are you the prop...
Bridlington - YO15
Enquiry from: John G
Start Date: Immediate
need advice on rising damp.
Grimsby - DN36
Enquiry from: Steve D
Start Date: Immediate
Survey the full property and woodworm inspection an price for work ti be carried out
Goole - DN14
Enquiry from: Colin N
Start Date: Immediate
Damp and mould issues, loft bedroom walls and ceiling
Grimsby - DN34
Enquiry from: Maureen C
Start Date: Immediate
Need a quote for any damp in house 2 very tiny areas that look like it could be damp 3 bed semi
Barton-upon-Humber - DN18
Enquiry from: Malgorzata L
Start Date: Immediate
There is rising damp on front wall , it's,between window and door area but also on the other side of door frame ( it's a joining wall , it's about 2 ft high . Room length total is,around 3 meters( sma...
Driffield - YO25
Enquiry from: Judith C
Start Date: Immediate
I need a damp survey on a 2 bedroom mid terrace house. Currently empty and undergoing complete update of all decor.
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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.
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.
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.
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!
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