Conversion | Basement
Hounslow - TW3
Enquiry from: Sylvan G
Start Date: Immediate
Games room
Basement conversions fluctuate in cost depending on project scale, professionals hired and location. If your basement conversion doesnât need any construction work, then it should cost relatively little. However, the majority of projects at least need damp proofing and water proofing work, if not insulation, heating, electrical work and more. This means that even smaller basement conversion projects are still relatively expensive. The average UK cost ranges from £30,000 - £50,000.
| Avg. price low | Avg. price low |
|---|---|
| Avg. price | Avg. price |
| Avg. price high | Avg. price high |
£46500
£34875
£23250
£11625
£0
| Labour cost | £28,000 | |
| Material cost | £10,000 | |
| Waste removal | £2,000 |
Requests for quotations in Hounslow in May 2026
Requests for Basement renovation quotations in Hounslow in May 2026. 0% change from April 2026.
Requests for Basement renovation quotations in Middlesex in May 2026. 0% change from April 2026.
Hounslow - TW3
Enquiry from: Sylvan G
Start Date: Immediate
Games room
Woking - GU21
Enquiry from: George R
Start Date: Immediate
a 1910 built end terrace house. there are 2 rooms, both need to be tanked. rooms separated with a stair case. internal and external access to basement. both rooms roughly 3.6x3 meters with height of 5...
Woking - GU21
Enquiry from: George R
Start Date: Immediate
a 1910 built end terrace house. there are 2 rooms, both need to be tanked. rooms separated with a stair case. internal and external access to basement. both rooms roughly 3.6x3 meters with height of 5...
Slough - SL2
Enquiry from: S
Start Date: Immediate
Would like to extend the house underground. No Basement right now. So would like to do underground extension below the existing house and back garden.
Windsor - SL4
Enquiry from: Nerissa M
Start Date: Immediate
Homeowner Basement conversion, 200 sqm Please contact to appoint
Windsor - SL4
Enquiry from: Nerissa M
Start Date: Immediate
Homeowner Basement conversion, 200 sqm Please contact to appoint
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Whether a basement is worth converting depends on your location and how much work it requires.
A basement conversion can be a great way to add space to your home, and can raise your property value. However, it can also be one of the most expensive ways to do this, so if there’s a possibility to extend your property, or convert a loft or garage, it’s worth considering this first.
You should also compare how much your basement conversion will cost with the amount it could raise your property value by. In some areas, a quality basement conversion could earn you money in the long run, but in others it’ll only cost you. If you’re planning on staying in your property for a long time this might not matter to you, but if it’s not your forever home then it’s an important thing to think about.
Windows or lightwells can be a great way to introduce natural light into your basement, making it a more valuable, enjoyable space. However, they’re not always an essential requirement.
It’s important for your basement conversion to meet ventilation and fire safety building regulations. Windows can be a good way to do this, but they’re not the only option. Stack or mechanical ventilation, or ensuring that stairs up from your basement connect to an exit can be a good alternative.
So, while windows can be a great asset to your basement conversion, if you can’t afford them or they’re not structurally feasible, you can still create a basement conversion without them.
The best way to go about converting a basement depends on its current condition and what you’d like to use it for.
If you’re happy with its size and structure, and just want to turn it into useful storage space, then your project shouldn’t be too complicated. You’ll simply need to make sure it’s damp proof and waterproof – either by fitting tanking or a cavity drain membrane with a sump and pump. You may also need to invest in new flooring, fit basic lighting, and plaster and paint the walls and ceiling.
If you’d like to turn your basement into living space, then you’ll need to think about ventilation, insulation and heating. If this involves creating a kitchen or bathroom, you’ll also need to incorporate plumbing.
If you want to extend your basement, add lightwells, or fit windows and a sunken garden, this makes things much more complicated. You’ll probably want to hire an architect or basement conversion building specialist to help you with the design and planning, and you’ll need a structural engineer to help you ensure your property is sufficiently supported.
If your basement has a cavity drain membrane, it’ll need a pump to move water away from the exterior of your basement and prevent flooding.
Sump pumps can be noisy, but they don’t have to be. Generally, if you have a well-designed pump that’s installed correctly, you shouldn’t find it a problem. For best results, hire a skilled, experienced professional to supply and install your drainage system.
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