Extensions including garage conversions will often require supplementary damp proofing to be installed during the conversion, as the existing garage will typically have a single skin design for walls and floors, which was not manufactured to be in accordance with building regulations for habitable rooms. This damp proofing should 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 usually 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 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 some garages, the walls will have already been damp proofed, but this may need to be updated as part of the conversion in order to adhere to 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 integral part of the building regulations that the garage conversion should comply with, therefore is it necessary to make sure that your garage conversion makes use of 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 |
Requests for quotations in County Antrim in May 2026
Requests for Damp proofing quotations in County Antrim in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in Northern Ireland in May 2026. 0% change from April 2026.
Belfast - BT8
Enquiry from: Michelle D
Start Date: Immediate
Damp proofing course, we will do the replastering so quote me only for a damp proofing course for a detached 4 bedroom house. It needs the damp proofing course all around the premiters of the house. G...
Belfast - BT7
Enquiry from: Christine D
Start Date: Immediate
Rising damp in the main entrance hallway to the surgery.
Newtownabbey - BT37
Enquiry from: Mark K
Start Date: Immediate
Damp showing at the Gable end of the house. Please get me a quote for diagnosis and treatment
Portrush - BT56
Enquiry from: Steve R
Start Date: Immediate
there is a damp issue to be sorted on the ground floor of this manor building - in 2 flats would like a quote to be carried out - preferably between 20-dec & 2-jan but can get access at other times ...
Duneight - BT27
Enquiry from: Emma W
Start Date: Immediate
Home buyer survey showed damp in living room gable wall
Belfast - BT15
Enquiry from: Alice T
Start Date: Immediate
Just had a survey completed on a house we’re purchasing and looking to get quotes based on the damp they found in the property. Dampness found around the following sites in the house and just looki...
Carrickfergus - BT38
Enquiry from: Korben S
Start Date: Immediate
Mould on one side of the home, looks like an issue with internet and exterior via rendering etc but unsure
Ballymoney - BT53
Enquiry from: Daryoush H
Start Date: Immediate
Hi, I would like a visit from your specialist to prepare me a report on damp, black mould, Kind regards
Belfast - BT9
Enquiry from: Christina T
Start Date: Immediate
There are patches of damp on the chimney wall that I would like to get sorted out.
Duneight - BT27
Enquiry from: Helen J
Start Date: Immediate
I am looking for a quote for damp proofing a whole house I am interested in purchasing.
Ballymena - BT43
Enquiry from: Derek L
Start Date: Immediate
Im sure ,so I would like a survey done to find the solution
Ballymena - BT43
Enquiry from: Steve R
Start Date: Immediate
assess and quote for damp proofing
Belfast - BT9
Enquiry from: Carl P
Start Date: Immediate
Hi there! I had a homebuyers report done on the property and was advised to seek a damp specialist to inspect and advise based on "high damp meter readings taken throughout the original property at gr...
Ballymena - BT42
Enquiry from: Sharon M
Start Date: Immediate
Survey to establish cause of damp
Belfast - BT13
Enquiry from: Mark M
Start Date: Immediate
Mold showing on bedroom ceiling and some walls.
Ballymena - BT42
Enquiry from: Jamie R
Start Date: Immediate
Need a survey on damp, condensation build up
Newtownabbey - BT36
Enquiry from: Julie H
Start Date: Immediate
Got roof replaced and insulated, also cavity wall insulation. Still getting damp round ceiling and wall joining into ceiling in our bedroom. Probably condensation damp as window always wet next morn...
Ballymoney - BT53
Enquiry from: Jade B
Start Date: Immediate
hello, we had a small amount of damp in one of our rooms, had a wood burning stove with flexi flue liner fitted earlier this year and over the last few days have had a large damp patch appear on the ...
Belfast - BT13
Enquiry from: Niyi A
Start Date: Immediate
condensation, mould and rising damp
Belfast - BT13
Enquiry from: Ashleigh R
Start Date: Immediate
Damp detected in ground floor of the property and upstairs in second bedroom ceiling.
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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.
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.
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!
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