Extensions including garage conversions will often require supplementary damp proofing to be added as part of conversion, as the existing garage typically has a single skin design for walls and floors, which was not manufactured to comply with building regulations for habitable rooms. This damp proofing will need to be added to walls and floors. Moreover, the roofing of the garage conversion will need water proofing. The damp proofing of the floor of the garage conversion will most likely be achieved by employing a damp proof membrane. This membrane will come in either solid or liquid form. The damp proof membrane will be put down either on top of the existing concrete floor, below the new floor, or as part of both, depending on whether the floor will be a solid or a floating floor. In a few garages, the walls have already been damp proofed, but this might need to be updated as part of the conversion in order to adhere to current building regulations. The walls should be damp proofed in order to protect the brickwork from rotting gradually as moisture sets in. This can be carried out by either applying damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls that are already present in the garage. Damp proofing is a part of the building regulations that the garage conversion will need to comply with, therefore is it vital 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 |
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| Avg. price | Avg. price |
| Avg. price high | Avg. price high |
£1900
£1425
£950
£475
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| Labour cost | £1,050 | |
| Material cost | £375 | |
| Waste removal | £75 |
Searches that showed our Damp proofing page for Gwynedd
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At Home Energy Save GB Ltd we are specialists in all fields of damp proofing and energy efficiency within the home. Whether your problem is loft condensation, rising damp, penetrating damp, black mould or simply heat loss then we can help. We sp...
Phone consultant was lovely and polite. Barry came out to review our home and was very professional, friendly and gave ...
Holyhead - LL65
Enquiry from: Thomas M
Start Date: Immediate
Home buyers report has reported rising damp and damp within the ground floor and windows of the property. I'm wondering if i could please get a quote for the work of damp coursing and putting right th
Llandudno - LL30
Enquiry from: Emma D
Start Date: Immediate
I was wondering if you could provide a quote for a damp proof course to the external walls
Property: semi detached
Barmouth - LL42
Enquiry from: Jennifer d
Start Date: Immediate
Possible floor membrane for some rising damp patches on a stone built Welsh (address removed) with stone tiles on ground floor only
Llwyngwril - LL37
Enquiry from: Nicola M
Start Date: Immediate
We have a cottage which is built into a hill and has a partly damp back wall. The cottage was originally two and has been knocked into one. One of the original cottages was treated prior to us owning
Blaenau Ffestiniog - LL41
Enquiry from: Wayne T
Start Date: Immediate
Damp survey required please
Llandudno - LL30
Enquiry from: Aleksi F
Start Date: Immediate
Hi, i’m looking for a written quotation for localised damp treatment at 4 dolydd, llandudno ***. the surveyor has mentioned some rising damp on parts of the ground-floor walls (only the affected are
Property: semi detached
Trefriw - LL27
Enquiry from: Chrissy K
Start Date: Immediate
Problem with damp & mould in certain areas
Llandudno - LL30
Enquiry from: Suzan O
Start Date: Immediate
Basement damp proofing or replastering options to make basement area into usable living space
Pentraeth - LL75
Enquiry from: Jane C
Start Date: Immediate
An internal wall has damp issues we think from underneath as its got a cavity between ground an floor so need it i jetting or a solution thank you
Menai Bridge - LL59
Enquiry from: Michael E
Start Date: Immediate
Stone building suffering from rising damp
Pwllheli - LL53
Enquiry from: Martin M
Start Date: Immediate
Kitchen front wall Hall Living room All at the front inside walls
Holyhead - LL65
Enquiry from: Jade H
Start Date: Immediate
We have 5 properties in Holyhead with damp issues
Holyhead - LL65
Enquiry from: Alan M
Start Date: Immediate
We have a small damp problem one in the interior living room and one in a bedroom. (address removed) has a tenant in and the inviromental health said we need a rics qualified surveyor or indemnity ins
Bangor - LL57
Enquiry from: Charlotte D
Start Date: Immediate
Gable end damp proof issues, 2 saturated internal walls, full damp proof course required
Property: detached
Llwyngwril - LL37
Enquiry from: Vered R
Start Date: Immediate
Investigate why a chimney that was taken down in March 2024, because of wall dampness has caused an even bigger dampness problem that spread further to kitchen, dining room and 2 bedrooms on the north
Llandudno - LL30
Enquiry from: Margaret L
Start Date: Immediate
Damp survey and damp proofing
Blaenau Ffestiniog - LL41
Enquiry from: Caroline H
Start Date: Immediate
Damp in wall seems to be from roof. Fungus growth downstairs near firvplace
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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!
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.
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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