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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.
Local builder decades of experience,
Thank you
Came at a moments notice and solved our problem. Thanks!
I have a sssts certificate.”site supervisor course” First aid at work certificate Public liability insurance -Building works and renovations. -Brickwork -Groundwork’s -Interior work -Exterior work -Pointing
Dan delivered exceptional service during the repointing work at our house. He consistently demonstrated professionalism and courtesy, impressing us with his punctuality and polite demeanor. The work was completed as quoted, and the quality of the finished job was excellent. We are thoroughly satisfied with the results and would gladly enlist Dan's services in the future.
ACUBUILD SOLUTION LTD
Cellar & Basement Conversion
We do new build and home renovation, specialised in kitchens and bathrooms installation, plumbing and heating.
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We specialise in structural works, underpinning, steelwork and basements. Our experienced team are also experts in damp control, waterproofing and tanking solutions and all our work is guaranteed, offering our clients complete peace of mind.
We had a retaining wall fixed in our basement. Kevin was great at communicating and helpful with the issues we had. The team working were great, polite, and kept the place clean and tidy each day. Very reliable. Thanks!
Mk kitchen and bathrooms is a small family run business covering the essex area. We cover all aspects of kitchen, bathroom fitting and complete internal house refurbishments. Including carpenty, tiling, plumbing, plastering, painting and also electrical work.
GIZA SOLUTIONS LIMITED
Cellar & Basement Conversion
Giza Solutions is renowned for its exceptional performance in executing and completing a wide range of domestic and public development projects with utmost excellence. With a wealth of experience and expertise, we have perfected our craft in a wide range of endeavors, from modest home renovations to lavish architectural ventures. Our unwavering commitment to our company values is evident in everything we do. At Giza Solutions, our approach is characterized by innovation, efficiency, and sustainability. We strive to exceed expectations, always delivering projects that are a testament to our unwavering dedication to excellence.
KCTLondon is a design-based Construction firm operating from Greater London, delivering quality services to clients’ satisfaction and within budget. Our products have remained high-end but our prices are competitive giving us the edge over many others.
I was very pleased with the work done. All the tradespeople were very helpful and pleasant We were very pleased with the works.
Quick&Easy Developments Ltd is a leading property development firm, dedicated to delivering streamlined, high-quality solutions for residential, commercial, and mixed-use projects. Known for our efficiency and cost-effectiveness, we focus on meeting modern client needs with innovative designs and sustainable practices. Our team is committed to transparency, speed, and exceptional service, ensuring that every project is completed on time, within budget, and to the highest standards. At Quick&Easy Developments, we simplify the complexities of property development to create spaces that inspire. We believe preparation is everything , We are friendly and hardworking Team that works to a high Quality and Standard. Services -Extension -New Build -Loft Conversion -Paving & Slabs For driveway and Garden -Paint and decoration -Home Improvements -interior and exterior painting -Door Stripping -wooden Windows Stripped &painted -Anti Vandal Coating -Wall Murals -Property Maintenance -property Repair -Install Plasterboard -Easy Filler Plastering French Style . -Multi Finish Plastering -Rendering
We are a small run company with high values and dedication to the works required by our clients. Most of our clients have us back for more work, read the reviews for yourself ... 40 + 5 star ratings and members for over 7 years.
Started off well then started disappearing off to other jobs (I am not local to the property) then carried out small painting touch up at another property. Tried to say he put 4 men into a terraced property, it’s just a days work for one person then tried to charge £1300!. Main job not completed and failed to turn up the Thursday because their car had been impounded as no insurance, refused to pay £1300 but asked for a fair price. They have now disappeared without completing what they have been paid to do
BTL Building & Landscaping
Cellar & Basement Conversion
BTL Building & Landscaping – Creating Timeless Spaces, Built To Last At BTL, we specialise in transforming outdoor & indoor areas into extraordinary spaces that reflect elegance, functionality, and timeless appeal. Whether it's a luxury garden retreat, a bespoke outdoor living area, or a comprehensive property renovation, our building and landscaping services are designed to exceed expectations—every time. Crafted for Excellence We are not just builders or landscapers—we are artisans of space. Our mission is simple: to deliver high-end solutions that not only elevate properties but enrich lifestyles. From concept to completion, we bring a level of precision, care, and craftsmanship that sets a new standard in the industry. Each project we undertake is treated as a unique expression of our client’s vision. Our team collaborates closely with homeowners, architects, and developers to ensure every detail aligns perfectly with your goals—whether you’re seeking to increase property value, create a stunning visual statement, or build a sanctuary for everyday living. We would love to part of your journey creating spaces you thought you could only dream of. BTL Building & Landscaping Creating Timeless Spaces, Built To Last
We have high standards in our work both quality and quantity. Our workmanship is to support your needs and expectations.
Responded quickly Full description of work necessary and price and starting date On site for 3 days - very tidy : quality work :site left clean .Pleasant people to work with
Cortship flooring RYANS
Cellar & Basement Conversion
Family run business. Over 30 years experience, Skilled, high quality engineers in our team. Our services are 99% dust free!
Kosta64 LTD is building company we do extension , fully refurbished and roof replacement,painting and interior work!
This job was to temporarily provide us with a shower over the bath - Konstantin explained a way of doing the and once we had ordered the bits required he came back and did the job. The job was done exactly as he explained for the exact price he quoted. Thank you very much.
Welcome to Dan Construction! You've come to the right place, we pride ourselves on being the best at what we do. We have a team with a wealth of experience in the industry that will do the utmost to ensure you are happy with the service. Please get in touch for a free obligation quote.
Do not trust this man! He did a runner without completing the work, and the work completed is shoddy. Avoid like the plague, and save yourself the headache
DGR Builders LTD
Cellar & Basement Conversion
This company is successfully. It has young and skilled workers. The company is serious about work and works on time. A young team of Romanians who want to achieve very good results. Trust our work and you will not regret it. We can negotiate any price. Thank you for your choice.
family run bussines myself Kenny maccallum and two sons 34 yrs experience working self employed and contract work for other firms just finished working as general foreman and project management for past four years back working for myself fairtrades reg
Excellent service from quality craftsmen who really take a pride in their work. After employing MacCallum Builders we wouldn't go anywhere else. Alan & Debra Morrison, 17/8/18
From stunning home extensions to innovative loft conversions, our expert team transforms properties across London , Kent , Essex and surrounding areas with nearly three decades of trusted craftsmanship. From concept to completion, we bring over 25 years of expertise to every project across. Extensions Add the space you need with extensions that complement your home . Loft Conversions Turn your unused loft into a functional room that adds real value to your property. Renovations Refresh and modernise your home with renovations that make a real difference. General Building From repairs to major building work, we handle projects of all sizes with care. New Builds Complete new property construction built to your specifications and the highest standards.
A great company to deal with, prompt, reliable and very professional. We live in an old Victorian house with hardly a straight angle anywhere. So Anunas had a tricky job to do. The job was done perfectly and to agreed cost. I would recommend this builder to you. If I could could give give 6 stars I would. Great job well done.
I can construct and repair building framework and structure- such as stairway,door frames windows/sash window,flooring,partition and rafters-made from wood and other materials. I can also install kitchen cabinets, sliding doors and dry wall. I am a specialist in Fire check door-offices and homes.
I was happy with the work John did for me. No complaints at all!
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