Extensions such as garage conversions will usually require additional damp proofing to be added during the conversion, as the existing garage will typically 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 added to 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 using 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 if the floor will be a solid or a floating floor. In a few garages, the walls will have already been damp proofed, but this might have to be updated as part of the conversion in order to meet current building regulations. The walls should be damp proofed to be able to safeguard the brickwork from rotting slowly as moisture sets in. This is accomplished by either employing damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls already present in the garage. Damp proofing is a part of the building regulations that the garage conversion should adhere to, and so is it vital to make sure that your garage conversion incorporates appropriate 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 Hertfordshire in May 2026
Requests for Damp proofing quotations in Hertfordshire in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in East Midlands in May 2026. 0% change from April 2026.
St. Albans - AL4
Enquiry from: Nick W
Start Date: Immediate
i have penetrating damp on a solid 9inch wall 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
St. Albans - AL3
Enquiry from: Alan S
Start Date: Immediate
check out damp intrusion coming through walls are you the property owner: owner of the property property type: terrace how many rooms do you need damp proofing: 1-2 rooms please call to appoint
Bishop's Stortford - CM23
Enquiry from: Car M
Start Date: Immediate
TEST WALLS basement hack off half of wals plaster left tank will be at address 11.30 to 3 sunday and later on monday
Potters Bar - EN6
Enquiry from: Nik D
Start Date: Immediate
possible water penetration in two places in the house are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: semi detached please call to...
Harpenden - AL5
Enquiry from: Ben T
Start Date: Immediate
i think i have damp in one bedroom, and it gets much colder than the rest of the house. Another room gets mouldy in one corner, not sure if thats something you can help with. The room where i think ...
Welwyn Garden - AL8
Enquiry from: Gregory D
Start Date: Immediate
We had someone quote for DPC repair on one corner of our house where it has clearly failed. But I wanted to see what it would cost to do the whole house while we are at it.
Bishop's Stortford - CM23
Enquiry from: Evie R
Start Date: Immediate
Hello [Company Name], I own a property in Bishop’s Stortford and have noticed possible damp and mould behind my kitchen cabinets. I’ve also seen small insects (psocids) which I understand may be ...
Waltham Cross - EN8
Enquiry from: Lorena S
Start Date: Immediate
A building survey was done and it seems that there is some rising damp in the living room and some possible issues with the isolation in one of the bedrooms. I'd appreciate it if we could discuss th...
Bishop's Stortford - CM23
Enquiry from: Carla M
Start Date: Immediate
MAJOR leaks left by insurance company have ingressed into the walls and been tested and surveyed to high damp levels and failed tanking to basement floor and outside toilet courtyard. Quote for all w...
Royston - SG8
Enquiry from: Vikas K
Start Date: Immediate
Looking for a damp consultant/builder, we have an extension where the dampness in the wall from the bottom up is seen. Upon removing the flooring boards, we see there is a black surface with a membran...
Welwyn Garden City - AL7
Enquiry from: Yvonne M
Start Date: Immediate
since replacing a conservatory roof, i have a damn issue 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 ap...
Tring - HP23
Enquiry from: Anna P
Start Date: Immediate
We are in the process of purchasing a property and would like to arrange for a PCA-registered damp and timber specialist to conduct an inspection before exchanging contracts. Our survey has highlig...
Berkhamsted - HP4
Enquiry from: Nick W
Start Date: Immediate
We have some damage to 1 wall which is caused by damp - most likely due to external problems with roof and wall. We would appreciate it if you could come to provide an estimate for repair and any fur...
Bishop's Stortford - CM23
Enquiry from: James D
Start Date: Immediate
the main issues are dampness in downstairs bathroom and second floor bathroom, as well as potentially the living room. there is also ceiling damage and staining in the downstairs cupboard due to a pos...
Baldock - SG7
Enquiry from: Marc B
Start Date: Immediate
We are in the process of buying a house in Ashwell North Herts - we need a quite for works done to control damp.
Ware - SG12
Enquiry from: Ernest H
Start Date: Immediate
Damp on external wall of property also check for woodworm
Royston - SG8
Enquiry from: Louise W
Start Date: Immediate
hi, we spoke on the phone just now. my name's louise and my property is no. 4 priory lane, royston, ***. it's a ground floor maisonnette with basement (if relevant). rising damp was detected in the ki...
Berkhamsted - HP4
Enquiry from: Laura S
Start Date: Immediate
We have black mould caused by condensation we think in 3 rooms, a bedroom, our porch and our kitchen. There is there odd spot of mould elsewhere but not much. We also have mould buildup on 4 window fr...
St. Albans - AL3
Enquiry from: Alex A
Start Date: Immediate
Damp survey to be done in commercial property
Waltham Cross - EN8
Enquiry from: Jemma R
Start Date: Immediate
I have rising damp in my hallway near the staircase and I also damp near the front door on the opposite wall. There seems to be. lot of damp, even water around the stopcock which is in the same area n...
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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.
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!
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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