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 South East in October 2024
Requests for Basement renovation quotations in South East in October 2024. 0% change from September 2024.
Requests for Basement renovation quotations in United Kingdom in October 2024. 0% change from September 2024.
From past fifteen years we have been established as the finest building and construction service provider to clients in Bromley and its surrounding areas.
Very friendly and helpful.
Oxford - OX4
Enquiry from: Vicky K
Start Date: Immediate
Membrane laid Flat is 20 m sq
St. Leonards-on-Sea - TN38
Enquiry from: Emilia C
Start Date: Immediate
We need to convert our 29m sq basement asap into a granny annexe for my mum. Ideally make it a liveable space (no digging down needed) and add a shower room and kitchenette.
Brighton - BN2
Enquiry from: George B
Start Date: Less than one month
hello, i'm looking at converting a half basement 2.7 x 3.5m in a semi (not the party wall) into a standard utility room, requiring 0.9m depth removing to be level with the kitchen floor. are you the ...
Bicester - OX25
Enquiry from: Peter W
Start Date: Immediate
we need external tanking to our extension foundations. are you the property owner: owner of the property property type: semi detached how many rooms are currently within the basement: 1 room how many ...
Reigate - RH2
Enquiry from: Judy W
Start Date: Immediate
i am looking to purchase a conversion flat on blackborough road in reigate (postcode and house number is estimated as awaiting details from estate agent). it already has a basement but i require a qu...
Guildford - GU1
Enquiry from: Phil S
Start Date: 1 to 3 months
convert the cellar into a bedroom are you the property owner: owner of the property property type: terrace how many rooms are currently within the basement: 2 rooms how many rooms do you want to have ...
Milton Keynes - MK12
Enquiry from: Sophie C
Start Date: Immediate
floor excavation to minimum habitable room depth (to comply with building regs) from current depth of 6.1 ft waterproofing solution e.g. tanking insulation flooring installation provision of doorway ...
Chichester - PO19
Enquiry from: Andy G
Start Date: 1 to 3 months
would like to look at two options, tanking or taking the floor down a metre as not sure if there are regulations on height etc. the basement is currently not used for anything other than a little bit ...
Milton Keynes - MK12
Enquiry from: Sophie C
Start Date: Immediate
floor excavation to minimum habitable room depth (to comply with building regs) from current depth of 6.1 ft waterproofing solution e.g. tanking insulation flooring installation provision of doorway ...
Tunbridge Wells - TN1
Enquiry from: Roger B
Start Date: Immediate
homeowner conversion basement please call to appoint
Ramsgate - CT11
Enquiry from: Mark J
Start Date: 1 to 3 months
need basement complete overhaul and new floor joists and steels above. are you the property owner: owner of the property property type: terrace how many rooms are currently within the basement: 1 room...
Banbury - OX15
Enquiry from: Gill M
Start Date: Immediate
existing cellar and outhouse to be dry lined are you the property owner: owner of the property property type: detached how many rooms are currently within the basement: 1 room how many rooms do you w...
Gillingham - ME7
Enquiry from: Oliver P
Start Date: Immediate
current basement needs ventilating, and then pipes/electrics need re routing, current space needs staircase widening and then finishing - flooring, walls and lighting. we do not want to drop the floo...
Gillingham - ME7
Enquiry from: Ankit D
Start Date: Less than one month
basement conversion to en-suite bedroom do you have an architect or planning permision: none do you require a plumber: yes do you require an electrician: yes would you consider an easy payment plan: y...
Littlehampton - BN17
Enquiry from: Sandra W
Start Date: Less than one month
we have acquired the flat in a grade 2 listed building and there is a cellar that comes as part of the flat ownership and we would like to make it safe and revert to a general use area. can you assist...
Dartford - DA1
Enquiry from: Karen C
Start Date: Less than one month
cellar conversion into kitchen are you the property owner: owner of the property property type: detached how many rooms are currently within the basement: 1 room how many rooms do you want to have in ...
Ramsgate - CT11
Enquiry from: Angeline S
Start Date: Immediate
add kitchen and bathroom in basement are you the property owner: owner of the property property type: semi detached how many rooms are currently within the basement: 2 rooms how many rooms do you want...
High Wycombe - HP14
Enquiry from: Ricky L
Start Date: Immediate
hi we live in a cottage that used to be a pub and would like to convert the old cellar into a tv / cinema room. room is 3.5m x 3.0m so not a huge project. we would like more headroom in the room so t...
Oxford - OX3
Enquiry from: Sarah F
Start Date: Less than one month
damp proofing a 5mx4m basement for use as a storage area. are you the property owner: owner of the property property type: semi detached how many rooms are currently within the basement: 1 room how ma...
Oxford - OX3
Enquiry from: Sarah F
Start Date: Less than one month
damp proofing a 5mx4m basement for use as a storage area. are you the property owner: owner of the property property type: semi detached how many rooms are currently within the basement: 1 room how ma...
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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.
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.
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.
In some cases, it’s possible to convert a basement into an apartment. This can be a great way to incorporate an additional dwelling into your property and increase its value. However, converting a basement into an apartment can be quite expensive and time-consuming.
As with any type of dwelling, you’ll need to think about basic things like access, damp proofing, ventilation, insulation, heating, electrics, plumbing, lighting and décor. If you’re planning on extending your basement, then you’ll also need to ensure that your property is sufficiently supported.
It’s a good idea to consult a professional, like a basement conversion building specialist, to find out how feasible your project is before you go ahead with it.
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