Extensions such as garage conversions will usually require additional damp proofing to be installed through the conversion, as the pre-existing garage typically has a single skin design for walls and floors, which was not built to conform to building regulations for habitable rooms. This damp proofing will need to be put into walls and floors. In addition, the roofing of the garage conversion will need water proofing. The damp proofing for the floor of the garage conversion will in most cases 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 pre-existing concrete floor, underneath 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 have been damp proofed, but this might need to be updated as part of the conversion to be able to meet 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 performed by either making use of damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls that are 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 necessary 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
| 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 Greater London in June 2026
Requests for Damp proofing quotations in Greater London in June 2026. 0% change from May 2026.
Requests for Damp proofing quotations in United Kingdom 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...
all good
London - SW16
Enquiry from: Joel J
Start Date: Immediate
rising damp. removing existing plaster and injecting damp proof chemicals and re plastering and painting of wall at front window bay. are you the property owner: owner of the property property type: ...
London - SW20
Enquiry from: Angela S
Start Date: Immediate
we have discovered an issue with property and would like a visit/inspection to identify the cause property type: terrace how many rooms do you need damp proofing: 1-2 rooms are you the property o...
Pinner - HA5
Enquiry from: Kiran M
Start Date: Immediate
damp treatment for bedroom 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
London - W3
Enquiry from: Chris R
Start Date: Immediate
Front of house approximately 6M fix the damp proofing externally. Red brick 1920s terraced proofing
Ashford - TW15
Enquiry from: Krishna A
Start Date: Immediate
To check whether the wall is damp or not
London - SE27
Enquiry from: William P
Start Date: Immediate
There is damp in my conservatory which was built about 10 years ago. The damp has affected one wall and the shed ceiling and only appears after prolonged rain.
Pinner - HA5
Enquiry from: Kiran M
Start Date: Immediate
Damp wall in daughter’s bedroom. Find and fix the issue
Harrow - HA3
Enquiry from: Mukund V
Start Date: Immediate
Quotation ***dground Massionnet dampening & condensation & general upgrading for the house.
London - SW7
Enquiry from: Harriet S
Start Date: Immediate
tanking one bedroom wall, a hall way wall and a utility room wall. are you the property owner: relative of owner how many rooms do you need damp proofing: 3-4 rooms property type: other please call t...
Mitcham - CR4
Enquiry from: Ope O
Start Date: Immediate
I want to Waterproof the flat concrete roof and damp proof the end of terrace wall.
Beckenham - BR3
Enquiry from: Pippa S
Start Date: Immediate
I have a damp patch on the wall in my kitchen
London - SW16
Enquiry from: Aamir R
Start Date: Immediate
My bedroom roof got damp marks. Need to fix that.
Brentwood - CM13
Enquiry from: Sophie B
Start Date: Immediate
floor tiles lifting. took some up and the concrete underneath is damp. are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: detached pl...
London - SW16
Enquiry from: Cam I
Start Date: Immediate
Initially: Inspection and analysis of damp wall Then: Repair works
Ilford - IG2
Enquiry from: Alok A
Start Date: Immediate
Anti-Mould, Damp painting required for the entire 2/3 bedroom flat including cleaning existing mould etc.
London - E7
Enquiry from: Zahirulhasan S
Start Date: Immediate
Due to recent rains, some water / moisture seems to have seeped onto the inner wall, blistering the paint / coating; so may need damp proofing / sealing of some sort.
Bishop's Stortford - CM23
Enquiry from: Car M
Start Date: Immediate
TEST WALLS basement hack off half of wals plaster left tank will be at address 11.30 to 3 sunday and later on monday
Hornchurch - RM12
Enquiry from: Simon P
Start Date: Immediate
Just moved into a house and started decorating. Noticed signs of damp in the corner of *** bedroom while painting. Discoloured and flaking paint. Rusty screws in window blind. Guessing a roof or rende...
London - SE5
Enquiry from: Susan L
Start Date: Immediate
Basement level of flat has some damp issues. Requesting a report and quote. I am the Landlord, Susan Lunn and I live in Australia. However, please contact my letting agent, Kate Morrison at Urban V...
Bishop's Stortford - CM23
Enquiry from: Evie R
Start Date: Immediate
Hello [Company Name], I own a property in Bishop’s Stortford and have noticed possible damp and mould behind my kitchen cabinets. I’ve also seen small insects (psocids) which I understand may be ...
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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.
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!
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