Extensions including garage conversions will often require additional damp proofing to be installed through the conversion, as the existing garage normally has 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 added to walls and floors. Moreover, the roofing of the garage conversion will need water proofing. The damp proofing of the floor of the garage conversion will often be achieved by utilising 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, underneath 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 meet current building regulations. The walls will need to be damp proofed in order to protect the brickwork from rotting gradually as moisture sets in. This can be performed by either applying damp proof membranes, waterproof rendering, or cavity insulation, depending on the type of walls that are already in the garage. Damp proofing is an integral part of the building regulations that the garage conversion will need to comply with, and so is it important 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 Norfolk in May 2026
Requests for Damp proofing quotations in Norfolk in May 2026. 0% change from April 2026.
Requests for Damp proofing quotations in East Of England in May 2026. 0% change from April 2026.
Dereham - NR20
Enquiry from: Justyna D
Start Date: Immediate
i have a home survey level 2 done. report is stating high level of damp inside walls across the ground level floor both on external and internal walls. second issue is there is no dpc inside the walls...
Norwich - NR8
Enquiry from: David J
Start Date: Immediate
I have just moved house and all I need to do at the moment is ventilate my basement. Can you help with that or recommend someone who can?
Great Yarmouth - NR30
Enquiry from: Tamara P
Start Date: Immediate
Hi, we are looking for someone who is under the PCA to conduct a Damp survey as the lenders found damp in the basement. Thank you
Great Yarmouth - NR29
Enquiry from: Sara J
Start Date: Immediate
Damp patches on living room wall. Also minor patches on other living room walls. Only one room affected. House built around 1865. I have been told that damp proof rods would solve the problem, followe...
Diss, Eye - IP21
Enquiry from: DAVID W
Start Date: Immediate
a survey required as we are not sure what the problem is.
Dereham - NR20
Enquiry from: Sandra A
Start Date: Immediate
Damp in kitchen rising from bottom of one wall to half way up
King's Lynn - PE32
Enquiry from: Catherine N
Start Date: Immediate
I have a damp issue around my fireplace, chimney breast and exterior wall on ground floor. One other small patch on opposite interior wall. I was hoping you could come and take a look and provide a qu...
Wymondham - NR18
Enquiry from: Reginald W
Start Date: Immediate
One bedroom single storey property in Wymondham, in need of an injected DPC and whatever re-plastering is necessary, along with ancillary works
Dereham - NR19
Enquiry from: Audrey P
Start Date: Immediate
After carrying out a home buyers survey, it has highlighted some issues with damp and roof repairs which are needed. Are you able to provide a free quote?
King's Lynn - PE31
Enquiry from: Alexandra W
Start Date: Immediate
investiagte cause of damp penetration to two front rooms and carry out remedial works as required. are you the property owner: owner of the property how many rooms do you need damp proofing: 1-2 rooms...
Sheringham - NR26
Enquiry from: Sarah W
Start Date: Immediate
Hi. Our holiday let is up for sale and we'd like a survey to check for damp please
Norwich - NR11
Enquiry from: Erin M
Start Date: Immediate
a house has an awful smell unlike other damp houses we have lived in. We think it is under the laminate flooring. The previous owners had several cats and dogs. How much would a thorough examination...
King's Lynn - PE30
Enquiry from: Sonia M
Start Date: Immediate
i have rising damp around the fireplace and in 2/3 more points. would it be possible to arrange an appointment to come and see it?. thank you.
Cromer - NR27
Enquiry from: Annett L
Start Date: Immediate
i’m writing to request a quotation for damp proofing work on our victorian house. originally, the property was part of a larger building before wwii. during the war, the adjoining section (a hotel) ...
Sheringham - NR26
Enquiry from: Helen B
Start Date: Immediate
We are selling our house and the survey has cited issues with damp a the rear of our property. We are seeking a second opinion regarding the work that needs doing and a quote for that work to be carri...
Dereham - NR20
Enquiry from: Chris L
Start Date: Immediate
Damp on outer wall, penetrating through to upstairs bedroom and downstairs lounge
King's Lynn - PE31
Enquiry from: Susan M
Start Date: Immediate
In 2022 an ensuite extension was built onto the side of our bungalow. At the junction of one of the external walls which joins onto the original wall both sides of the the stud wall between the bedro...
Fakenham - NR21
Enquiry from: Maureen S
Start Date: Immediate
This is a 1600 property which was completly renovsted in 1998/_1999.When we purchased it i 2000it had been dp proofed by Dampacure. The damp on the fro t wall has come back. this is .yholiday home ...
Fakenham - NR21
Enquiry from: Jonathan R
Start Date: Immediate
hi we have just bought a house and the survey showed up that the outside wall needs a damp proof injection. please could you give me a idea on cost and availability are you the property owner: owner o...
Thetford - IP24
Enquiry from: Victoria O
Start Date: Immediate
damp proofing the 3 walls outside and insulating walls in rooms inside. i live in a house are you the property owner: owner of the property property type: semi detached how many rooms do you need damp...
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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!
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.
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