Extensions including garage conversions will often require additional damp proofing to be installed as part of conversion, as the pre-existing garage routinely has a single skin design for walls and floors, which was not built to be in accordance with building regulations for habitable rooms. This damp proofing should be put into walls and floors. Furthermore, the roof of the garage conversion will require water proofing. The damp proofing for the floor of the garage conversion will most likely be achieved by using a damp proof membrane. This membrane is available 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 in order to safeguard the brickwork from rotting gradually as moisture sets in. This is performed by either utilising 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 adhere to, therefore is it important to ensure that your garage conversion employs 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 St Albans in May 2026
Requests for Damp proofing quotations in St Albans in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in Hertfordshire in May 2026. 0% change from April 2026.
The historical city of St Albans, found in southern Hertfordshire just twenty-two miles from London, is actually a sought after area on the property market. The area is well known due to the higher homes price tags, which are some of the most expensive in the United Kingdom. The city still preserves a large amount of its traditional beginnings through the ages which includes the Abbey and 15th century clock tower. Making houses up-to-date is vital in St Albans to help make the most from high quotations so utilise our vetted specialists to conclude the task.
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
St. Albans - AL3
Enquiry from: Alex A
Start Date: Immediate
Damp survey to be done in commercial property
St. Albans - AL2
Enquiry from: Charles O
Start Date: Immediate
I need a damp check for a conservatory and cost to fixing Are you the property owner: Owner of the property How many rooms do you need damp proofing: 1-2 Rooms Property Type: Other Please call to appo...
St. Albans - AL4
Enquiry from: Sudhir M
Start Date: Immediate
Mould treatment in bathroom
St. Albans - AL1
Enquiry from: Trisha O
Start Date: Immediate
mould wash to property Are you the property owner: Tenant (with permission) How many rooms do you need damp proofing: 1-2 Rooms Property Type: Terrace Please call to appoint
St. Albans - AL1
Enquiry from: Gaby B
Start Date: Immediate
Mould removal for bedroom. Middle floor flat. Mould is present on walls
St. Albans - AL2
Enquiry from: Alexander T
Start Date: Immediate
We have mould around the window awning and ceiling of our bathroom and like to have it removed and prevent it in the future.
St. Albans - AL4
Enquiry from: Zach W
Start Date: Immediate
Please can you advise the cost of putting together and submitting a planning application including all required documentation for a 2 storey rear extension and conversion of a garage into a annex. Man...
St. Albans - AL4
Enquiry from: Lee L
Start Date: Immediate
Inspection of end of terrace house damp along all wall and lower level floor joyce How many rooms do you need damp proofing: 1-2 Rooms Property Type: Semi detached Time scale: Less than one month Are...
St. Albans - AL1
Enquiry from: M
Start Date: Immediate
Removal of patch of black mould on internal wall that cannot be removed through standard household cleaners. Are you the property owner: Owner of the property How many rooms do you need damp proofin...
St. Albans - AL1
Enquiry from: Alessia P
Start Date: Immediate
I am emailing on behalf of my manager at Chalon Kitchens St Albans. We have a terrible case of mould and damp in our basement, which we would like to have resolved. This is emitting a terrible smell t...
St. Albans - AL1
Enquiry from: Thomas A
Start Date: Immediate
Mould appeared on the wall in my airing cupboard after a water mains leak which flooded the carpet in the cupboard. Leak has now stopped. Tried removing mould with water and bleach but it reappeared. ...
St. Albans - AL1
Enquiry from: Gaby B
Start Date: Immediate
Home owner There is mould on the walls / ceiling in both of the bedrooms. Have tried removing it ourselves with bleach and hot water but just seem to be spreading it around the walls. It has caused t...
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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.
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.
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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