Extensions such as garage conversions will typically require supplementary damp proofing to be installed through the conversion, as the pre-existing garage typically has a single skin design for walls and floors, which was not designed to comply with building regulations for habitable rooms. This damp proofing will need to be added to walls and floors. Additionally, the roofing of the garage conversion will need water proofing. The damp proofing for the floor of the garage conversion will in most cases be performed by by using 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 whether the floor will be a solid or a floating floor. In some garages, the walls have been damp proofed, but this may need 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 protect the brickwork from rotting slowly as moisture sets in. This is carried out by either using damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls already present in the garage. Damp proofing is an important part of the building regulations that the garage conversion will need to comply with, and so 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 Portstewart in May 2026
Requests for Damp proofing quotations in Portstewart in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in County Londonderry in May 2026. 0% change from April 2026.
Portstewart - BT55
Enquiry from: Gregg R
Start Date: Immediate
We are currently experiencing damp penetrating in two areas of our house: 1. Through a wall at the the front of our house. The area is under large bay window 2. In the corner of our porch, above a...
Portstewart - BT55
Enquiry from: Maud F
Start Date: Immediate
Tenants say there is mould . Could you advise re putting this right
Portstewart - BT55
Enquiry from: Catherine W
Start Date: Immediate
Survey of damp proof in house and quote for repair
Portstewart - BT55
Enquiry from: Jacinta H
Start Date: Immediate
damp coming through in back bedroom ceiling (worst area) and kitchen ceiling - not sure what is causing the problem are you the property owner: relative of owner how many rooms do you need damp proof...
Limavady - BT49
Enquiry from: Clare M
Start Date: Immediate
Have a crack in a wall below my front window, In my living room. I think it is cracked all the way through,
Coleraine - BT51
Enquiry from: Gordon C
Start Date: Immediate
Several points around the house which look like there may be a damp problem - inspection and advice required
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 ...
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
Coleraine - BT51
Enquiry from: John P
Start Date: Immediate
Wall in bungalow bedroom feels wet from time to time, wetness is lower part of wall. Looking for a qualified person to inspect and recommend solutions as necessary.
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 ...
Ballymoney - BT53
Enquiry from: Hannah G
Start Date: Immediate
We live in an older house and we have a few areas that are mold prone. As well as wet walls and some rising damp.
Ballymoney - BT53
Enquiry from: Karen M
Start Date: Immediate
i'm having problems with damp in one room are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: terrace please call to appoint
Coleraine - BT52
Enquiry from: Sarah M
Start Date: Immediate
We need a survey of our house that we are selling. We seem to have developed a damp problem over the past 3 mths, that the house has been empty. Mainly downstairs but also on the chimney in the roof ...
Coleraine - BT52
Enquiry from: Mark K
Start Date: Immediate
Condensation & water running down the wall from the ceiling ( bungalow)
Coleraine - BT51
Enquiry from: Kurt L
Start Date: Immediate
Our house is a 19th century stone end of terrace that is a B2 listed building - which limits what we can do with windows and doors. In addition to usual condensation related damp around the windows,...
Limavady - BT49
Enquiry from: Ronan M
Start Date: Immediate
having a lot of issues with damp in our house down here in limavady. got some roof vents installed last year but hasn’t done the trick. have a humidifier in as well but no use. wondering if you do a...
Limavady - BT49
Enquiry from: Sarah M
Start Date: Immediate
Hi Billy - thanks for taking my call today. If you could get out to me urgently re: woodworm treatment as I need a certificate. Thanks again
Coleraine - BT51
Enquiry from: William M
Start Date: Immediate
Cleaning and Gutter repairs, Damp Proofing
Coleraine - BT51
Enquiry from: Tom P
Start Date: Immediate
Damp on walls. Possibly requiring damp proofing
Coleraine - BT52
Enquiry from: Rory M
Start Date: Immediate
rising damp evident in internal solid walls of terrace house. damp course required are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type:...
Answer a few quick questions, so we can match you with local damp proofing specialists who can help.
Get free, no-obligation local damp proofing quotes from 4 verified damp proofing specialists working in Portstewart.
Compare customer reviews, services and prices, and choose the right tradesperson for you.
Would highly recommend, they found me a firm which I was happy with a quote they give me and went ahead and had my job done within 2 days of enquiring.
Good easy way to find a selection of trades you need all in one place.
Love Local Quotes it's a big part of my Business I would recommend to anyone
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.
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.
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.
We can help you get more damp proofing work with our qualified job leads and boost your business.
Join today