Extensions including garage conversions will often require additional damp proofing to be added through the conversion, as the pre-existing garage normally 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 have to be put into walls and floors. Additionally, the roof of the garage conversion will need water proofing. The damp proofing for the floor of the garage conversion will often be achieved by by using a damp proof membrane. This membrane will come in either solid or liquid form. The damp proof membrane will be placed 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 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 can be carried out by either using 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 important part of the building regulations that the garage conversion will need to comply with, and so is it vital to ensure 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 Letchworth Garden City in May 2026
Requests for Damp proofing quotations in Letchworth Garden City in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in Hertfordshire in May 2026. 0% change from April 2026.
Letchworth is a town in the county of Hertfordshire in the East of England. It has a populace of 33,600 and was the world's very first garden city. The town has witnessed drastic refurbishment in recent history with the cinema and shopping centre renovated in 1996 and 1997. An extra important project was presented in 2009 to boost facilities in Letchworth. For any household developments you might need soon, be sure just to make use of vetted and respected specialists and get the top price available.
Letchworth Garden City - SG6
Enquiry from: Jessica D
Start Date: Immediate
We are having condensation and damp problems in our bathroom and in the cupboard under our stairs. We would appreciate a visit and a quote for remedial work.
Letchworth Garden City - SG6
Enquiry from: Ruben T
Start Date: Immediate
2 walls with damps in 2 differenr houses - 5 min away from each other are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: terrace plea...
Letchworth Garden City - SG6
Enquiry from: Mark W
Start Date: Immediate
hi.. trying to get average prices on bush hammering per m2..can you help
Letchworth Garden City - SG6
Enquiry from: Servjit L
Start Date: Immediate
A shared wall is showing set it s of condensation.
Letchworth Garden City - SG6
Enquiry from: Barbara S
Start Date: Immediate
My dad's house (he's 97) had a leak discovered in 2018 under the upstairs bathroom washbasin. This was caused by the plumber who refurbished it 4 years ago - not putting a 'major bolt' on the washbas...
Letchworth Garden City - SG6
Enquiry from: Richard H
Start Date: Less than one month
We need a quote to clean mould of the beer cellar walls Are you the property owner: Owner of the property How many rooms do you need damp proofing: 1-2 Rooms Property Type: Commercial Time scale: Le...
Letchworth Garden City - SG6
Enquiry from: Clare E
Start Date: Immediate
Mould needs to be removed from bathroom ceiling and a little on bathroom walls and some mould needs to be removed from bedroom ceiling
Letchworth Garden City - SG6
Enquiry from: E
Start Date: Immediate
Suspected damp in the bedroom, ground floor flat. Seal around window looks faulty which is how moisture seems to be getting in or could be rising damp. Other rooms appear unaffected.
Letchworth Garden City - SG6
Enquiry from: Laurence K
Start Date: 1 to 3 months
Full damp course treatment Are you the property owner: Owner of the property How many rooms do you need damp proofing: 3-4 Rooms Property Type: Semi detached Time scale: 1-3 months Please Call to...
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
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.
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...
Dunstable - LU6
Enquiry from: Dawn S
Start Date: Immediate
Look at where the damp is coming from. In the porch area and in the small bedroom
Luton - LU1
Enquiry from: Debbie E
Start Date: Immediate
some damp in two rooms in the corner of the rooms are you the property owner: owner of the property how many rooms do you need damp proofing: 3-4 rooms property type: terrace please call to appoint
Luton - LU4
Enquiry from: Simon P
Start Date: Immediate
rising damp three walls with damp rising are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms property type: commercial please call to appoint
Ware - SG12
Enquiry from: Ernest H
Start Date: Immediate
Damp on external wall of property also check for woodworm
Stevenage - SG2
Enquiry from: Martin L
Start Date: Immediate
I would like some advice on a bedroom that was replastered in July but is still showing dark patches on some internal walls. If ringing please call after 15.00 as a nightworker.or contact me by e-mai...
Ware - SG12
Enquiry from: Rebecca L
Start Date: Immediate
just purchased house. believe we may have damp in front room and back room. need a damp inspection. are you the property owner: owner of the property how many rooms do you need damp proofing: 3-4 room...
Dunstable - LU6
Enquiry from: Ashfa K
Start Date: Immediate
determine where the damp is coming from and suggestion on how to treat, also have green mold on skirting boards which i am having to wipe in every couple of weeks
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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!
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.
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.
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.
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