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Basement renovation

Basement renovation

At a time when moving home ends up costing thousands of pounds in fees, staying put and improving has become popular amongst thousands of UK homeowners.

By improving your home with a basement conversion, not only will you add value to your property, but you’ll have extra space that can be used all year round.

Why should I convert my basement?

In most instances, the basement is usually a dark and dingy area housing a few boxes or cases of wine. Basements are normally large areas and utilising this space can increase your home’s value by thousands of pounds and give you extra room throughout the year.

Benefits of basement conversions include:

  • Added value

By converting your basement you’ll be able to add value to your property. By moving home you’ll end up wasting thousands of pounds in fees, so stay put and improve.

  • Extra space

With a basement renovation you’ll make the most of extra space and as the infrastructure is already in place you won’t have to pay out for construction. You can turn this wasted area into anything you want, from a bedroom or lounge to a study or games room.

  • Cheap conversion

As the basement is already in place the room will only need to be secured and made safe, rather than having to pay out for an extension to be built on the back of your property. This means you’ll save money and be able to start using the new space quickly.

Basement conversion quotes

With a basement conversion you can start using wasted space more effectively, adding value to your home and saving on moving expenses.

For up to four FREE quotes from local, vetted and reputable professionals simply complete our quick form and find out how much you could save with a basement renovation.

Average Basement renovation cost

Basement conversions fluctuate in cost depending on project scale, professionals hired and location. If your basement conversion doesn’t 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.

Average price per Basement renovation job in 2022

Avg. price low

Avg. price low
£40,000

Avg. price

Avg. price
£182,500

Avg. price high

Avg. price high
£323,000

£323500

£242625

£161750

£80875

£0

Prices based on actual Basement renovation costs for your area, as reported by local Quotatis members.

Basement renovation installation cost in your area 2022

Labour cost £28,000
Material cost £10,000
Waste removal £2,000
Time frame: 1-6 months

Advantages for Basement renovation

  • Adds an additional space your home
  • Preserve Your Garden
  • Boosts Your Home's Value
  • Can add real interest to your home and a wow factor

Disadvantages for Basement renovation

  • Basement conversions are a serious type of extension, they can take up to nine months for bigger excavation projects. That’s a lot of noise and mess.
  • Unless you can get natural light into the basement they can look dark and gloomy
  • Consideration needs to be made to ensure that the room doesn't become damp

Basement renovation Manufacturers

Basement renovation FAQs

Does a converted basement need windows?

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.

Is a basement conversion worth it?

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.

Are pumps used for basement conversions noisy?

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.

How to convert a basement into living space?

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.

How to convert a basement into an apartment?

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.

Inside a modern basement conversion in London

Nicholas James Construction

Based: in Bromley, BR1

From past fifteen years we have been established as the finest building and construction service pro...

Latest review

Cosima R., SE13
29th January 2016

Conversion | Basement in London

Very friendly and helpful.

Rated Local builders

Nicholas James Construction

7 review(s)
Based: in Bromley, BR1 3AX

From past fifteen years we have been established as the finest building and construction service provider to clients in Bromley and its surrounding areas.

Similar Customer Enquiries for Basement renovation

07 Dec

Conversion | Basement

Halifax - HX2

Enquiry from: Jools D

Start Date: 3+ months

Basement renovation Lead

small cellar to convert into a dry storage area. not for sleeping or entertainment. just storage and the clothes drier is down there. the size is approx 10ft x 4ft with a bit arou*** x 9ft coming off ...

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02 Dec

Conversion | Basement

Banbury - OX15

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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...

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30 Nov

Conversion | Basement

Nelson - BB9

Enquiry from: Umar M

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cellar tanking and conversion. approximate area 400 sq feet. are you the property owner: owner of the property property type: commercial how many rooms are currently within the basement: 2 rooms how ...

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25 Nov

Conversion | Basement

Belfast - BT5

Enquiry from: Jason R

Start Date: Less than one month

we have had an offer accepted on this house. it has a large basement that covers the whole property. the ceiling height is around 230cm, so i presume the floor will have to be lowered to convert it in...

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21 Nov

Conversion | Basement

Manchester - M40

Enquiry from: Adam B

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moving into new house where basement needs to be made waterproof. room 1 3.88 x 3.81 room 2 4.17 x 3.17 some extra lengths will be needed. floor plan can be added. are you the property owner: owner o...

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15 Nov

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Bath - BA1

Enquiry from: Stuart W

Start Date: 3+ months

small cellar 500 sqft ish. previously tanked (4 years ago) by local builder with the aim that the cellar would then be converted for use as a utility room and storage space. the cellar has new plumbin...

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13 Nov

Conversion | Basement

Bath - BA1

Enquiry from: Lindsey C

Start Date: 1 to 3 months

converting the cellar into a usable family room. it has already been tanked. are you the property owner: owner of the property property type: terrace how many rooms are currently within the basement:...

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01 Nov

Conversion | Basement

Stoke-on-Trent - ST9

Enquiry from: Farhad H

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i am converting my garage into living spaces. one side of the garage is lower the yard which damp is coming through. so needs damp proofing are you the property owner: owner of the property property ...

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01 Nov

Conversion | Basement

Scarborough - YO12

Enquiry from: Jim E

Start Date: Immediate

cellar to be made water proof, natural table water coming through at present are you the property owner: owner of the property property type: terrace how many rooms are currently within the basement:...

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01 Nov

Conversion | Basement

Watford - WD17

Enquiry from: Tomas H

Start Date: Less than one month

basement to be converted into a living room are you the property owner: relative of owner property type: semi detached how many rooms are currently within the basement: 1 room how many rooms do you w...

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25 Oct

Conversion | Basement

St. Albans - AL1

Enquiry from: Ketan S

Start Date: Immediate

Basement tanking - 4m x 3M roughly, height is around 6 ft.

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21 Oct

Conversion | Basement

London - SW4

Enquiry from: William F

Start Date: Immediate

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Damp identified on lower ground floor. Front to back, including from water ingress from recent downpour/flooding in the area. Rectification, damp proofing and sump required - for long-term fix. Area ...

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20 Oct

Conversion | Basement

Norwich - NR2

Enquiry from: Paul C

Start Date: Immediate

small cellar conversion.. 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 rooms do you want to have in...

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15 Oct

Conversion | Basement

Mansfield - NG18

Enquiry from: Christine K

Start Date: Less than one month

renovation of dump cellar are you the property owner: owner of the property property type: semi detached how many rooms are currently within the basement: 3 rooms how many rooms do you want to have in...

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14 Oct

Conversion | Basement

St. Albans - AL4

Enquiry from: Sam S

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cellar conversion - existing waterproofing has been carried out, but the room is not a proper 'room.' it is a standard victorian terraced house with a 12ft x 12ft cellar are you the property owner: o...

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12 Oct

Conversion | Basement

Grantham - NG31

Enquiry from: Greg A

Start Date: Immediate

seal and make good our cellar - roughly 25 sqm. maybe some extra support for the ceiling. are you the property owner: owner of the property property type: semi detached how many rooms are currently wi...

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11 Oct

Conversion | Basement

Thornton-Cleveleys - FY5

Enquiry from: Alison W

Start Date: Immediate

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convert cellar into office, currently has a pump, seems to flood after heavy rain, walls do appear to be damp, just the floor are you the property owner: owner of the property property type: semi deta...

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10 Oct

Conversion | Basement

Leek - ST13

Enquiry from: Julie S

Start Date: Immediate

rsj fitted, concrete floor, walls tanked and plastered are you the property owner: owner of the property property type: terrace how many rooms are currently within the basement: 1 room how many rooms ...

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05 Oct

Conversion | Basement

Leeds - LS27

Enquiry from: Rebecca D

Start Date: Immediate

Looking for a quote for installing windows in my basement - one large window (egress) and one smaller window for ventilation.

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04 Oct

Conversion | Basement

Bury - BL9

Enquiry from: Thomas Q

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- cellar conversion -damp proofing - cellar window - walls/floors - plastering - a full cellar conversion are you the property owner: owner of the property property type: terrace how many rooms are c...

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