Extensions such as garage conversions will often require additional damp proofing to be added during the conversion, as the pre-existing garage will often have a single skin design for walls and floors, which was not designed to be in accordance with building regulations for habitable rooms. This damp proofing will need to be put into walls and floors. Additionally, the roof 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 will come in either solid or liquid form. The damp proof membrane will be placed down either on top of the 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 already been damp proofed, but this might need to be updated 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 protect the brickwork from rotting gradually as moisture sets in. This is done 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 should adhere to, and so 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 |
£3000
£2250
£1500
£750
£0
| Labour cost | £1,050 | |
| Material cost | £375 | |
| Waste removal | £75 |
Requests for quotations in Gloucestershire in June 2026
Requests for Damp proofing quotations in Gloucestershire in June 2026. 0% change from May 2026.
Requests for Damp proofing quotations in South West in June 2026. 0% change from May 2026.
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
Gloucester - GL1
Enquiry from: Muhebbullah W
Start Date: Immediate
a 2 bedroom semi-detached property, rented. there is a leakage on the corner of a ceiling, someones tried before,fixed and leaking again are you the property owner: owner of the property how many room...
Cheltenham - GL52
Enquiry from: Angus C
Start Date: Immediate
we are looking to tank a ground floor room that suffers from an aquifer underneath when we have exceptional rain coming up through the concrete screed, & are looking for a tanking membrane to be put o...
Cheltenham - GL50
Enquiry from: Peter W
Start Date: Immediate
An assessment!! For damp…
Cheltenham - GL54
Enquiry from: Sebastien M
Start Date: Immediate
I currently own a property in Northleach, a grade 2 and find that it is quite humid downstairs with a good bit of condensation in the morning. I would like to understand what it is going as we don't s...
Stroud - GL5
Enquiry from: MIKI L
Start Date: Immediate
Hi, we’ve discovered a rotten timber damp issue under our floor. It appears to be caused by a drainage ditch outside the wall that’s collecting rainwater with no outlet, leading it under the house...
Stroud - GL5
Enquiry from: Janet B
Start Date: Immediate
had extensive survey prior to moving in. areas of damp in basement kitchen/room and one bedroom *** floor. survey available are you the property owner: owner of the property how many rooms do you need...
Moreton-in-Marsh - GL56
Enquiry from: Lesley B
Start Date: Immediate
Not sure - some damp by the rear wall and in the kitchen.
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
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...
Tewkesbury - GL20
Enquiry from: Steve C
Start Date: Immediate
we have an issue in our downstairs toilet, where the paint is bubbling up and we also have a crack in the wall and some brown stains. i have sanded it all down, applied some damp proofing paint but af...
Moreton-in-Marsh - GL56
Enquiry from: Andrea G
Start Date: Immediate
Survey of the property on ground floor this week and works to be undertaken ASAP
Wotton-under-Edge - GL12
Enquiry from: Carole W
Start Date: Immediate
Water penetration in 2 areas upstairs. We have tried to resolve it our selves but unsuccessful. Also need a damp proof course put in downstairs
Cirencester, Fairford, Lechlade - GL7
Enquiry from: Victoria P
Start Date: Immediate
Damp course in two rooms and by a fireplace
Stroud - GL6
Enquiry from: Katharine B
Start Date: Immediate
Excavate / cut away perimeter floor to be treated . Supply/ fix cavity drain plastic lining system . Plaster and skim . The length of the wall is 5.08 m and approximately 2.5 m high .
Cirencester, Fairford, Lechlade - GL7
Enquiry from: Claire B
Start Date: Immediate
We would like a damp survey
Gloucester - GL1
Enquiry from: Daniel S
Start Date: Immediate
We have had a damp report carried out on a rental property which has revealed damp proofing/tanking is required in the bathroom of a rental property we own. The tenant is due to vacate the first week ...
Cirencester, Fairford, Lechlade - GL7
Enquiry from: Rachel P
Start Date: Immediate
Hi there I am a PA for an owner of an 18th Centry barn in Ewen (GL7) and he has a tunnel that connectors his properties that has some damp issues and we are looking for someone to come and look at...
Drybrook, Longhope, Lydbrook, Mitcheldean, Ruardean - GL17
Enquiry from: Jane M
Start Date: Immediate
I have what I think is rising damp in the lounge on at least 2 wall. It is a detached stone built construction built in1800s.
Coleford - GL16
Enquiry from: Roger M
Start Date: Immediate
To look at solutions for damp around the door and around the house
Moreton-in-Marsh - GL56
Enquiry from: Kate Z
Start Date: Immediate
damproofing ground floor in parts property type: commercial how many rooms do you need damp proofing: 5+ rooms how many rooms do you need damp proofing: property type: please call to appoint
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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.
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.
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