Extensions including garage conversions will typically require extra damp proofing to be installed through the conversion, as the pre-existing garage will typically 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 need to be added to walls and floors. In addition, the roof of the garage conversion will need water proofing. The damp proofing of the floor of the garage conversion will usually be performed by utilising a damp proof membrane. This membrane will come in either solid or liquid form. The damp proof membrane will be placed 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 already been damp proofed, but this might have to be improved as part of the conversion in order to comply with 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 already present in the garage. Damp proofing is a part of the building regulations that the garage conversion will need to comply with, and so is it important 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 |
|---|---|
| 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 |
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Bushey has a population of 24,000 and it is a town in the Hertsmere borough of Hertfordshire in the East of England. Hertfordshire can be found in the south of the United Kingdom, bordering other counties including Essex and Cambridgeshire. Greater London is also directly to the south.
Slough - SL1
Enquiry from: Richard K
Start Date: Immediate
I need a damp and timber report carried out
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
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
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
London - N11
Enquiry from: Jagjit C
Start Date: Immediate
Party wall in the passage app. 8m long ground floor 1m high. Paint pealing off, plaster falling with small cracks
London - NW10
Enquiry from: Lakhan N
Start Date: Immediate
Damp proofing of 1 wall in communal ground floor hallway approximately 4.5 m/sq affected area from ground up. - Take back to brickwork approximate 1.5m height. - Apply for form of damp proofing - plas
Welwyn Garden City - AL7
Enquiry from: Yvonne M
Start Date: Immediate
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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.
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.
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.
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