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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.
B.W Building Solutions
Cellar & Basement Conversion
20+ years experience BW Building Solutions is built on a foundation of reputation, knowledge, and customer satisfaction. Specialists in Roofing, Loft Conversions, and Extensions, we cover all building needs, including Plastering Joinery Drainage Plumbing Decking Driveways and more..........
Hi I'm Neil Ainsworth director of NOA Builders. NOA Builders Ltd,is a small building firm with many years experience in a wide range of trades. We pride ourselves on doing a fantastic job with an exceptional finish. We treat clients houses with upmost respect, and will leave your property as clean and tidy as we find it. All of NOA builders contactors are fully Qualified in there respective trades. We have two Carpenters, a Stone Mason,a bricklayer, a painter & decorator, Plasterer & a roofer. We build extensions from the ground up, bathrooms & kitchens from start to finish, and basically cover all aspects of building. We're also very happy to do smaller jobs. I look forward to quoting jobs for you, and hopefully doing some quality building works for you. Many thanks Neil
Couldn't rate this company highly enough, from the very first contact to the finished job. They quoted competitively and quickly , regular message updates throughout the process. The job was started and finished on the days stated and the house was left in a very tidy state . The tradesmen were all skilled and lovely to boot , they went above and beyond to help me out. I am delighted with the job and just need them to do the rest of my house now!!
NICUABRU SERVICES LTD is a company formed over 7 years ago, specialized in flats, houses renovation and house extensions. Our aim is to provide good quality services at a reasonable price and customer satisfaction is crucia
Fantastic work, above and beyond what we asked them to do. Very happy with the finished job, done quickly too. Also great advice on other aspects of the refurb. Would definitely want to use the guys again. Thanks Nicu and Daro.
We are a reliable, fully qualified, fully insured builders & landscapers, with many years experience and a long list of satisfied customers. Check out our reviews! Please visit our website to view our photos.
Oli is superb. Tidy, conscious, and adaptable. He stripped out the plasterboard walls and studwork in our home prior to remodelling. He worked quickly and confidently and respected our home. Whilst stripping out he came across some asbestos and he dealt with it appropriately, contacting an asbestos registered colleague and bagging it up and safety removing it at a very reasonable cost. We plan on using him again soon
Xcel Property Solutions
Cellar & Basement Conversion
Xcel Property Solutions At Xcel Property Solutions, we provide a reliable, professional and high-quality service across a wide range of property improvement and renovation work. We have experience in both interior and exterior projects, from smaller improvements through to full property renovations. Our services include painting & decorating, landscaping, fencing, patios, block paving, driveways, guttering, fascias & soffits, roofing, tiling, bathrooms and general property maintenance. We take pride in delivering a high standard of workmanship while keeping our customers informed throughout the project. Whether you need a single room refreshed, your garden transformed or a larger renovation carried out, we approach every job with the same attention to detail. We are experienced, fully equipped and committed to leaving every project clean, tidy and finished to a standard we are proud of. We have recently completed a number of successful renovation and property improvement projects and can provide photos of our previous work so you can see the quality for yourself. Why choose Xcel Property Solutions? * Experienced and reliable tradesmen * Interior & exterior property services * High-quality workmanship * Competitive and transparent pricing * Fully equipped for a wide range of projects * Clean, professional approach * Recent project photos available * Customer satisfaction is always our priority Get in touch today for a free quote or to arrange a site visit.
DUMICON LTD
Cellar & Basement Conversion
Construction company with main builder having over 16 years experience in the trades. Good prices and great quality work is ensured when we finish projects and all types of insurance certificates for this company are available on request.
Established in 1994 we offer a comprehensive building service for kitchens, bathrooms, alterations, extensions or new builds. I have over forty years experience in the industry and twenty five of those with UK national housebuilders. If you have a project we provide a free consultation and a fixed price quotation with a full specification attached. Our design and build service can take care of the complete project to provide you with a turn-key completion. Our tradesmen are all qualified and experienced and we are fully insured to include design liability.
Cannot fault the work carried out. The guys were very focused and kept mess to a minimum. Andrew kept checking in to see how it was going. We love our new mezzanine. Thanks again all.
DBCKG LTD
Cellar & Basement Conversion
At DBCKG, our goal is to not only help you design and build We are a full-service design/build company with a wide range of experience. We can help you with all phases of new home construction or remodeling: finding/procuring suitable land, architecture and design, building your home and landscaping your yard. Our excellent reputation and long list of satisfied clients attest to our superior. craftsmanship, attention to detail, clear communication, honesty and integrity. Just ask for our client reference list. we will give you 5 yaers guarantee for all major job.
25 years experience as a builder and over 15 years running my own business I specialise in property renovation, loft conversion, bathrooms and kitchens fitting Cooperating with and architect, fully qualified electrician and Gas Safety plumber All job insured
Andrew and his team did a great job with our refurb. His quote was very competitive and he was easy to communicate with. Very happy with the finish. Would definitely recommend him and use his team again for any other work in the future.
Complete Plumbing & Heating Services
Cellar & Basement Conversion
Complete Plumbing & Heating has been carrying out all types of Plumbing , Heating & Gas Installations and repairs . Also we have carried out various building refurbishments, alterations and maintenance. (See photos of works completed)
15 Years Experience in the industry. I specialise in Interior & Exterior design, repair, refurbishment and all general handyman work so feel free to get a quote on big or small jobs. From fixing shelves to making an extension to your house with my team of dedicated professionals. I look forward to hearing your idea’s and making them a reality. Feel free to contact me & I look forward to hearing from you.
Huseyin and his son could not have been more professional or helpful. Huseyin came to quote for the job (concrete frame around a window), and explained exactly what he would do and how much it would cost. It was great how transparent he was and easy to deal with. I would recommend his company. Thanks
Weagan Building Contractors have a combined construction knowledge of 40 years experience in the construction industry. We managed projects from start to finish with all are clients. Full house builds, full house deisgn and build, single & double story extensions, full house renovations and barn conversions. Simply put we are big enough to handle any project at the same time as being small enough to care about each individual client & their project. Weagan Building Contractors have a specialist groundworks and drainage department. We cover domestic and commercial drainage installation and repairs. This along with a highly skilled team of employees & a passion for doing things correctly makes us the perfect answer for all construction projects.
Morgan and Mike contacted me on the day of posting my job, visited that same afternoon and sent me an itemised quote that evening. They understood that the job was urgent and turned up on the appointed day, at the appointed time. Both my wife and I found they were happy to explain their work and to give us options. The work was neat, efficient and just what we needed. We will definitely use them again and would be happy to recommend them. Very pleased.
We at Zora Construction Ltd providing top quality works to our customers. Our staff is highly experienced in all kinds of building works. All of our work is fully guaranteed.
We agreed date and time & they didn’t turn up for the job
Generation
Cellar & Basement Conversion
Anthony Flude Refurbishments
Cellar & Basement Conversion
Company has been established for 25+ years . Fully insured . Small freindly team.
Established in 2001, I.c.joinery are a well respected family ran company doing everything from small projects up to contract work for the ministry of defence. The pride we take in our work speaks for itself. Offering a full design, manufacturing (in our own workshops) and installation service, also project management with access to all trades.
Ian was so nice and helpful and did a fantastic job! Both my daughters and I are over the moon with the beds Ian has designed and made for us. Thanks you so much Ian
We’re an established start to finish building company that pride our selfs on our professional nature and due care and attention to the customers needs, the company boasts professional trades in Bricklaying, Joinery, Electrics and Roofing. Between us we have over 55 years of experience in the trade and you will not be disappointed with our ambitions to please.
We are a Kent based renovation team made of 8 highly skilled trades, very welcoming and tidy. We like to stick to a dedicated timescale which we discuss with the client before any projects. We can take on any jobs small or large including; Bathroom renovation, Kitchen renovation , Plumbing and heating, Electrical, Carpentry, Tiling, Painting and Decorating, Plastering Building. We have a specialist for each trade, very fairly priced. We have been running for 7 years with 15+ years of experience. Our client always comes first, with our team always going the extra mile! We offer free Quotations/advice for new or old clients. Very friendly/tidy team that show up on time and gets the project sorted within the set time limit. No project is too big or small for KPRSLtd so please get in contact. Take care, From the team at KPRS.
We are specialised in Kitchen, bathrooms and all type of furniture instalation. We are team of handyman, plumer, electrician and carpenter.
Excellent Kitchen Tiling! Peter did an amazing job! Professional, friendly, and efficient, he completed the work quickly. The pricing was fair, and he kept everything clean throughout. Highly recommend for quality tiling!
Mint Roofing
Cellar & Basement Conversion
We make quality a habit, not an act. With tools in each of their hands, Mint roofing is here to help homeowners in Dorset and Hampshire build their dreams and ideas into realities! Trust the name that homeowners throughout the years have trusted to service them in their roofing needs. Call today and let Mint roofing show you quality! Our Mission & Commitment to the Homeowner: •Always deliver quality work effectively and efficiently. •Always exceed the Homeowner's expectations with nothing but the best service. •Always provide a pleasant and worry free experience. We not only reconstruct gardens, we build long lasting relationships. Re newing your roof should be an enjoyable and exciting experience, not a stressful one! •Always do what we say we will do. •Be there for homeowners whenever they need us. It is important to know that Mint roofing is always available. Just contact us with any questions and we will be more than happy to assist.
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