Extensions including garage conversions will usually require extra damp proofing to be added during the conversion, as the existing garage routinely has 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 should be added to walls and floors. Furthermore, the roof of the garage conversion will need water proofing. The damp proofing for the floor of the garage conversion will often be performed by employing a damp proof membrane. This membrane can come 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 will have already been damp proofed, but this may have to be improved as part of the conversion in order to meet current building regulations. The walls should be damp proofed to be able to safeguard the brickwork from rotting slowly as moisture sets in. This can be carried out by either employing 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 comply with, therefore is it important to ensure that your garage conversion makes use of appropriate 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 |
Searches that showed one of our pages for Borehamwood, all services
Borehamwood is an urban area within southern Hertfordshire, situated 12 miles (19 km) from Charing Cross. It possesses a population of 31,065. It's within the civil parish of Elstree and Borehamwood and the London commuter belt. There's just one weekly newspaper, the Borehamwood and Elstree Times. The town is probably most well known because of its film and TV studios, typically referred to as Elstree Film Studios, hence the connection to Elstree.
London - N7
Enquiry from: Ravneet M
Start Date: Immediate
Have had two internal walls in a basement flat come up with high moisture readings. 40% in an internal bathroom wall which feels dry but has some hard bumps at the bottom. Width of wall is about 70cm
London - N9
Enquiry from: Molly M
Start Date: Immediate
Assess my wall and sort out the damp prof problem
Pinner - HA5
Enquiry from: Kiran M
Start Date: Immediate
London - W3
Enquiry from: Chris R
Start Date: Immediate
Front of house approximately 6M fix the damp proofing externally. Red brick 1920s terraced proofing
Potters Bar - EN6
Enquiry from: Priyanka R
Start Date: Immediate
To review the damp, see the source, take damp readings and advise the best course of action
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
St. Albans - AL4
Enquiry from: Nick W
Start Date: Immediate
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
St. Albans - AL3
Enquiry from: Alan S
Start Date: Immediate
Potters Bar - EN6
Enquiry from: Nik D
Start Date: Immediate
Possible water penetration in two places in the house
Property: semi detached
Harpenden - AL5
Enquiry from: Ben T
Start Date: Immediate
I think i have damp in one bedroom, and it gets much colder than the rest of the house. Another room gets mouldy in one corner, not sure if thats something you can help with. The room where i think it
Welwyn Garden - AL8
Enquiry from: Gregory D
Start Date: Immediate
We had someone quote for DPC repair on one corner of our house where it has clearly failed. But I wanted to see what it would cost to do the whole house while we are at it
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
Iver - SL0
Enquiry from: Levina M
Start Date: Immediate
We do not own this house currently; however are imminently exchanging on this property, we are requesting 2 quotes for each of the areas damp has been identified in the survey report. There is unlikel
Waltham Cross - EN8
Enquiry from: Lorena S
Start Date: Immediate
A building survey was done and it seems that there is some rising damp in the living room and some possible issues with the isolation in one of the bedrooms. I'd appreciate it if we could discuss thes
Iver - SL0
Enquiry from: Sandy V
Start Date: Immediate
Hi, looking for a free quotation for damp treatment. Are you able to visit my property next week on Friday 29/08/25? Pls advise
Waltham Abbey - EN9
Enquiry from: Graham M
Start Date: Immediate
Skirting blown. Was damp behind skirting and on floor. No pipes in this area, so no leaks. Possibly penetration from outside, next to front door
London - SW11
Enquiry from: Callum W
Start Date: Immediate
PIV installation in basement
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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.
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!
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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