Extensions such as garage conversions will usually require supplementary damp proofing to be installed through the conversion, as the pre-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 will need to be put into walls and floors. Additionally, the roofing of the garage conversion will require water proofing. The damp proofing of the floor of the garage conversion will often be achieved by employing a damp proof membrane. This membrane is available in either solid or liquid form. The damp proof membrane will be placed down either on top of the pre-existing concrete floor, underneath the new floor, or as part of both, depending on whether the floor will be a solid or a floating floor. In some garages, the walls have been damp proofed, but this may have to be improved as part of the conversion to be able to adhere to current building regulations. The walls should be damp proofed to be able to protect the brickwork from rotting gradually as moisture sets in. This can be accomplished by either using damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls that are already in the garage. Damp proofing is an integral 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
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| Avg. price | Avg. price |
| Avg. price high | Avg. price high |
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| Labour cost | £1,050 | |
| Material cost | £375 | |
| Waste removal | £75 |
Requests for quotations in South West in May 2025
Requests for Damp proofing quotations in South West in May 2025. 0% change from April 2025.
Requests for Damp proofing quotations in United Kingdom in May 2025. 0% change from April 2025.
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Penzance - TR20
Enquiry from: Tamsin B
Start Date: Immediate
Assessment and damp proofing of traditional stone wall in Annexe
St. Ives - TR26
Enquiry from: Miles A
Start Date: Immediate
survey and quote required for probable damp proofing please. are you the property owner: owner of the property how many rooms do you need damp proofing: 3-4 rooms property type: semi detached please ...
Stroud - GL5
Enquiry from: Rachel C
Start Date: Immediate
Would like to get a wall checked that looks quite damp and see how big an issue it is, and what we need to do to fix it
Radstock - BA3
Enquiry from: Holly S
Start Date: Immediate
We have a damp area on an exterior wall in the kitchen and also an interior wall.
Bristol - BS4
Enquiry from: Shoba H
Start Date: Immediate
Peeling paint by door. Mould on anything left touching wall. Basement flat that was completely taken to brick and tanked when converted.
Redruth - TR15
Enquiry from: Andrew H
Start Date: Immediate
Tanking to basement boundary walls to Royal Mail Distribution office. Can someone give me a call please
Bath - BA2
Enquiry from: Alice L
Start Date: Immediate
i've been in the house 3 years and i suspect when i viewed the property, a treatment/anti-damp paint was applied to disguise the problem. after moving in, a small section of damp appeared in a small a...
Callington - PL17
Enquiry from: Terry L
Start Date: Immediate
minimum 5 meters of DPC required on outside wall.
Ilminster - TA19
Enquiry from: Darren R
Start Date: Immediate
rising damp need to fill walls are you the property owner: owner of the property how many rooms do you need damp proofing: 3-4 rooms property type: terrace please call to appoint
Wellington - TA21
Enquiry from: Steve H
Start Date: Immediate
Prevent mould at walls-ceiling junction upstairs
Weston-Super-Mare - BS23
Enquiry from: Sheema A
Start Date: Immediate
damp on a wall encroughing to the ceiling skirting board
Taunton - TA2
Enquiry from: Rodney C
Start Date: Immediate
Two walls possibly another small one on a bathroom on a terraced house my daughter needs a certificate for a mortgage company
Salisbury - SP2
Enquiry from: Charlotte M
Start Date: Immediate
I am currently in the process of purchasing the above property, but there is damp on the outside (and i think) the inside. The outside wall is wet to the touch, and the inside part has panelling so yo...
Radstock - BA3
Enquiry from: Huw B
Start Date: Immediate
Gable end wall has damp issues
Moreton-in-Marsh - GL56
Enquiry from: Carole J
Start Date: Immediate
flat 6 is in a block of flats called marsh court. we have a damp problem on a couple of walls and would like a free quotation to ascertain the problem and what can be done. if you could please email m...
Par - PL24
Enquiry from: Debbie E
Start Date: Immediate
Would like areas of damp checked in bungalow and a quote for any works reqired.
Ilfracombe, Woolacombe - EX34
Enquiry from: Elizabeth H
Start Date: Immediate
Assume it's rising damp by the walls but one now has a long way patch
Glastonbury - BA6
Enquiry from: Joan R
Start Date: Immediate
Damp in kitchen of victorian house
Frome - BA11
Enquiry from: Jayne P
Start Date: Immediate
Hello, I wanted to enquire about a damp survey/consultation. We recently had a survey but would like a second opinion on the cause and possible solutions. There are 2 issues we would like looked at...
Newquay - TR8
Enquiry from: Rory P
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.
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.
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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