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Craig got in touch quickly, gave me a rough estimate over the phone and answered all my questions. Surveyor arrived on time, gave instant quote. Price was good. Michael and (another) Craig turned up to do the job on the day, time given. Good, tidy job. Can't fault anything, from start to finish!! Would recommend!
Mary
George and his team are experienced builders, replaced my front door with a custom frame/sidelights and raising the floor level in the hallway quite quickly - in fact, they were the only who came next day, gave a quote straightaway and were ready to start in just couple of days. They also had all the necessary tools and materials, were ready to buy something additional quickly on the day - if further adjustments were required to fit everything as I asked. Thanks a lot for your help, guys!
Dmitry
Highly recommend. These guys did a fantastic job of constructing our pergola and decking. Very hardworking and reliable. The job was completed in the time frame agreed and to a very high standard. We would 100% use them again.
Holly
A basement conversion has the potential to add a lot of value and space to your home. Once your team excavate your new basement, you can turn it into a bedroom with an ensuite bathroom, a new gym, a living room, or any other living space to transform your underground spaces into useable rooms. Find everything you need to know about hiring a local cellar conversion specialist. Below, we cover tips to help you find a basement conversion specialist:
Browse Cellar & Basement Conversion specialists
Take a look at our Cellar & Basement Conversion specialists profiles, read reviews and request quotes directly.
How to find a reliable, local basement conversion specialist
What does a cellar conversion involve?
If you already have a basement, then you might be looking to turn it into a liveable space by adding structural supports, damp-proofing, insulation, heating, and a new ventilation system. If your cellar was intended for storage and has low ceilings, your basement conversion team might have to dig down to increase the head height before they can add things like new plumbing and electrics.
Or, you might be thinking about extending your current basement, such as by digging underneath your garden. This is another great way to add more space and additional rooms to an existing basement.
If you don’t currently have a basement, you can also create a new one by carrying out excavation work. As well as the basement, you’ll also need a new staircase.
Whether you want to build a cellar from scratch or want to turn your cramped storage room into a brand new living space, a basement conversion specialist can help.
Factors to consider before hiring a basement conversion specialist
On average, a basement conversion can take anywhere from 12 to 20 weeks to complete. Avoid stress and costly repairs down the line by hiring a skilled specialist to help you upgrade your home. Look out for basement conversion installers that:
- Are a skilled company with a strong history of high standard projects
- Have all the licenses and insurance needed to protect you and their workers
- Have a good range of positive reviews from previous customers vouching for their reliability
- Are available to carry out the work in the timeframe you need it by
- Are quoting a price and payment option that you are happy with, having compared the quote with other basement conversion companies
How much does a basement conversion cost?
If you don’t have space for a rear or side extension, and don’t have a loft to convert, then a basement conversion is a great option to maximise your home’s space. How much you’ll end up spending on your basement conversion depends on a range of factors, including:
- The size and layout of your basement
- How many structural changes will be needed, including extra support beams and underpinning
- Waterproofing and damp proofing costs, as well as the installation of effective drainage systems
- Whether you want a window well installed, which can help you introduce light into your basement
- Basement insulation and soundproofing
- Labour costs, which are affected by where you live in the UK
The average basement conversion costs between £120,000 and £160,000. For a more accurate quote for your specific project, speak to a basement conversion specialist today.
Other basement conversion FAQs
Do I need planning permission for a cellar conversion?
You generally do not need planning permission if you are converting an existing basement into a living space without changing the building's external appearance. However, you will likely need approval if you are excavating a brand-new cellar, creating a separate living unit, or working on a listed building.
For more information, contact your local planning authority or visit the Planning Portal website. You can also read our planning permission guide for more information.
What questions should I ask before hiring a basement specialist?
Always ask if they carry public liability insurance, how many years of experience they have, and for a detailed cost breakdown and project timeline. You should also confirm if they use subcontractors, ensuring any gas engineers are Gas Safe registered and electricians are appropriately certified.
What is a sump pump, and do I need one?
A sump pump is a drainage system installed below the basement floor that automatically pumps out any groundwater that collects under the property before it can flood your room. Because cellars are naturally below the water table, a sump pump paired with a waterproofing cavity drain membrane is almost always required to ensure your conversion stays completely dry and structurally safe.
XProbuild Ltd is a London-based building company specialising in high-quality construction, renovation, and refurbishment projects. From roofing and structural works to full property renovations and bespoke garden houses, we deliver reliable, professional results — on time and on budget.
Lucian and his team were a dream to work with on our house renovation. They're professional, competent, and lovely company. The job was completed in good time, and without additional costs. Lucian went above and beyond to make sure we were happy with the finished project.
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At FREN, we are proud to offer a wide range of building services in South Bristol, designed to bring your ideas to life. From small-scale residential projects to large landscaping transformations, our skilled team delivers results that combine style, strength, and functionality. Every project is carried out with a commitment to high standards, ensuring your home or outdoor space is built to last.
Ben responded to my posting within the day. He arrived when he said he would and fixed the problem very swiftly. Very reliable, professional and polite service. I would recommend and would not hesitate to use Fren again.
A full service firm. We are able to tailor our offering to suit your demands from full service project management to small scale one off projects
Although a small scale job, Patrick was quick to respond to my post and very kindly talked me through a few options, which was very useful and much appreciated. Great that he was able to carry out the work so soon even with my tight timeline. Very satisfied with the result and price within my budget. Thank you, Patrick!
Damian Adam Drewiecki
Cellar & Basement Conversion
Hi I am Damian, BSc (Hons) Dip Arch RIBA, director and founder of ABOX. We do specialise in rear extensions, loft conversions and new build for small scale developers and private clientele. We have succeeded in delivering numerous residential projects in 2020 and are continuously improving on delivering high-quality workmanship.
Orchard Roofing & Guttering
Cellar & Basement Conversion
We are happy to pronounce or company Orchard roofing and guttering we undertake minor repairs to major overall complete new roofs new fascia boards guttering to Minaur repairs such as ridge tile repair chimney repair gutter fascia board repair we offer guarantee with all the work with a certificate in hand on completion ??? all the material is sourced from main suppliers. We use high-quality wood treated up-to-date technology regarding breathable member and felt new galvanised nails all up-to-date material that will keep your roof nice and dry. ?
Unique Building & Landscaping Ltd
Cellar & Basement Conversion
UBL Ltd (Unique Building & Landscaping) is a family run business doing jobs throughout Lincolnshire, We have many happy customers and a full portfolio of completed jobs. Our prices are always competitive and we aim to please.
Full home renovation expertise from building an extension to tap replacement. Electrical works, carpentry, Laminate/Carpet flooring, Bath installation, Kitchen installation, Interior/exterior design!! The ultimate damp proofing solution, using a cutting edge technology that allows walls to be protected from water ingress remaining its full strength and breathiness. Enjoy unusual projects that requires creative mind. If something seems complicated let us know we like complicated projects. Over 20 years experience with some of the most unusually creative projects help clients to improve and build their homes. We are a team professionally organised builders. Our team members experience vary from as low as one year experience for an apprentice to as high as 40 years engineering experience for experts.
The guys did a great job, high attention to detail, care not to make a mess, and provided creative solutions to both projects. Highly recommended!
I am mature & experienced in many aspects of home improvements. Over 30 yrs plastering, carpentry, fitting kitchens, bathrooms & much more. From start to finish I am hard working, reliable, tidy & can adapt to different environments. Please see my ratings.
Couldn't pick a better tradesman to carry out any work we asked for. They did a brilliant job on two rooms for me, very respectful, efficient & hard working. Thank you so much. Colin
Onstruction Ltd
Cellar & Basement Conversion
Roman home improvements is a company who pride them selves on high quality workmanship at affordable prices. We have over 20 years experience and cover all aspects of construction. We are here to not only build for your needs but with our experience and knowledge to help design for your needs.
Hi we do from one slate or tile too full re roof flat roofs garage roofs all upvc fasica boards soffit boards guttering and down pipes all tree work plus waste removals plus much more
Darren and Andy did good job, cleared a lot of rubbish and left the yard tidy.
we are Masons with over ten years experience, all four of us are level 3 qualified and take great pride in all of our work carried out and put 100% into everything we do we never leave a job until we are happy the end product and customer satisfaction we undertake everything from plumbing to eletrics new builds to extentions to changing a roof tile. no job to small.
They do exactly what they promise
My name is Slawomir Stanislawski. I always work hard to finish jobs to a high standard and with great attention to details. Customer satisfaction is my priority. I have been in the trade for 17 years. Services I offer: - general home refurbishment, - dry-lining,plastering, - painting,decorating,j - tiling floors and walls, - bathroom instalation,tiling,refurb, - floor- laminate,tiling,skirting boards, electric underfloor heating, - loft floor installation, - home maintenance, repair,
Great job, bedroom painted. Long day but completed in 1 day and kept everything clean and tidy. Will ask him to do more work in the future
Prime Form Construction LTD
Cellar & Basement Conversion
We are a building firm who prides themselves in all exterior and interior works- we have a fantastic range of trades and take on any major projects ! The range of works vary from; -Conversions , -All joinery works, -Man caves, Extensions -Feature walls, -Bathrooms, -High end refurbs, -All round building works... and much more! I have a high range of tradesman to hand including . Electrician Plumber Plasterer Painter Tiler Bricklayer Joiners We don’t do problems we only do Solutiions
Absolute 1st class service and build from Michael and his team. Communication was great from our first contact right through to completion. Excellent competitive pricing and good invoicing. The overall build quality of our extension is fantastic and thoughtfully done. We had a downstairs shower room, dining room and hall added with new back steps. Michael is a great problem solver too. Would definitely use again and highly recommended to anyone looking to have any sort of build project taken on.
With an esteemed 15-year tenure in construction, I offer a comprehensive suite of services tailored to elevate your residential spaces to unprecedented levels of sophistication and functionality. Specializing in block paving, loft conversions, spotlights, and painting and decorating, I blend technical prowess with creative vision to bring your ideas to life. From meticulously executed projects to innovative design concepts, trust in my commitment to excellence, professionalism, and client satisfaction to exceed your expectations at every turn. Experience the assurance of quality and the promise of transformative excellence as you embark on your journey with me, your trusted partner in crafting spaces that epitomize luxury, comfort, and timeless elegance. We specialise in- -drive way/patio installs and or jet wash & reseal -interior decorations -plumbing works -hard flooring -loft conversions. And a range of other things.
The guys were great,did what was required,all done in a day. Thumbs-up all round
A local company with experiance of all aspects of plastering . Fully insured, references available stretching back 25 years! All work personnel fully qualified CSCS card holders CITB registered
Rob did a fantastic job was reasonably priced , can’t thank him enough after another plastera let us down , he came straight away and sorted it all out thank you so much :)
MTD Building Contractors are a professional family run business with a wealth of experience operating within the building and construction industry throughout the Midlands.
Very good site
im a self employed bricklayer,ive been trading for over 30 years now.my work varies from ground work ,to complete extensions ,no job is too small and its no problem travelling,im a qualified bricklayer and i have my nvq skill card
Vinny removed a rotting timber beam and replaced it with a steel beam. It sounds simple but I saw skill and experience producing an excellent job. Take my word for it because the beam is now hidden by a coat of render, looking exactly as it did before.
IMPRESS EUROPE LTD
Cellar & Basement Conversion
Impress Europe Ltd is a full service construction company offering comprehensive solutions for residential, commercial and industrial projects. From design and planning to building and finishing, we handle everything - including new builds, extensions, loft conversions, renovations, landscaping and custom projects. Our team of skilled professionals are committed to delivering quality, safety and excellence in every job. We pride ourselves on reliability, clear communication and building long lasting relationships with our clients. Choose Impress Europe for all your construction needs - one company, every solution.
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