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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.
Lion Group London Limited
Cellar & Basement Conversion
Tooled with years of experience, we undertake design & reconfiguration of builds; adding value to your home or business. Working closely with you; we create a bespoke, quality finish within your budget & affordability. Delivering a high standard of skill & integrity of craftsmanship we are proud off
Small family run business, 40years experience. Pride ourselves on quality, we have a team of experienced tradespeople to carry out all aspects of building.
Never got in contact?
Garth Builders Ltd. for building and roofing services Building and roofing contractors provide a range of domestic and commercial building services. But we are not your average building and roofing contractor. Call us for a building or roofing service. We might just surprise you. We can undertake all kinds of building and roofing works. Building and roofing services are also known to charge exorbitant prices. However, our aim is to provide all customers with affordable building and roofing services. So if you are a homeowner or a commercial enterprise who needs a building or roofing work done, we are the company to call. We also work for the local authority so we understand the necessity of doing a good job. We are are fully compliant with safety and health regulations. Why Garth Builders Ltd. for these services? For more than 40 years, we’ve become a trusted and established name in building and roofing work around the city and nearby places. Rest assured we can meet your building and roofing needs with our safe work systems, use of superior materials and quality workmanship. We have the skills, expertise and the knowledge to work on any type of building and roofing project. We are always investing in and embracing new techniques so we are up to date with recent advancements in products and services. It also means we can provide a range of building and roofing services, all of which can meet your specific requirements. We also accept insurance for our building and roofing work, so please call us for the details. Our aim is to achieve great results and to ensure our customers requirements are reached with efficiency. Contact Garth Builders Ltd. today Thanks to our attention to detail and quality workmanship, we have a number of customers who rely on us for their building and roofing requirements. For any building or roofing work in this city, depend on Garth Builders to deliver quality services at very competitive rates. You can take our word for it. The services we offer are as follows All types of building works undertaken Extensions Conservatories All types of ground works Drainage Joinery works Plastering Flagging Roofing repairs Re-roofs Windows doors Pointing Dry verge systems Fascias & soffits All types of guttering works
Prompt response, and a good price, but the cricket club committee choose a local company nearby our club, with a similar price to the this business. Great communication from Jack.
Over 30 years of experience as a multi-tradesman. As well as being a qualified plumber I specialise in other wet trades e.g Decorating, Plastering & Rendering, Tiling & Bricklaying. Also, I fit laminate flooring, skirtings, architraves and timber stud work. I am always punctual and reliable, and clean and tidy in my work. I am also happy to assist in planning and designing projects.
Kevin arrived on time, did an amazing job on my mother’s bungalow, cleaned up afterwards. Polite, friendly and professional. Good price too.
I'm a sole trader,with 9 years experience and orientated to a quality finish of every job.
With over 10 years of hands-on experience, I am a skilled and reliable multi-trader, specialising in bricklaying and painting & decorating services. I take pride in delivering high-quality workmanship, attention to detail, and a professional finish on every project. My work consistently receives excellent feedback from clients, and I’ve built strong, lasting relationships through trust, reliability, and clear communication. Whether it’s residential or commercial work, I approach each job with dedication and a commitment to exceeding client expectations.
A good job done. The foundations were well within the requirements for the building placed on top. He was also courteous and kept everything tidy.
P.G.Hutches and Joinery
Cellar & Basement Conversion
Erne Property
Cellar & Basement Conversion
At Erne Property, we believe that every project is an opportunity to build not just structures, but lasting relationships. With our dedicated team of skilled professionals, we deliver high-quality craftsmanship and personalized service tailored to your unique vision. Whether it's residential renovations or commercial builds, we prioritize your satisfaction and the integrity of our work. Let us turn your dreams into reality.
Byko is a family owned business . Our workforce is fully qualified and experienced at working in domestic and commercial properties and carrying out construction services, property maintenance and installation work for our customer.
Excellent, can't praise them enough. Professional job.
All Property work undertaken. No job to small. Over 30 years experience. Give us a call or email for any advice.
Very pleased. Provided reasonable and prompt quote. Fully assembled gazebo from kit form (ordered online) including shingles roof. Very amenable and helpful in making adjustments where necessary for uneven patio and in final positioning of gazebo. Worked professionally and consistently. Could not fault.
We are a local firm with over 50 years building experience, my son Gareth is a CICS Gold card Carpenter & my oldest son is a City & Guilds advance craft Bricklayer as am I. All of our staff are qualified in their respective trades. We build extensions, carry out house repair & maintenance work, patio and slabbing work, groundwork and excavations, General concreting work, drainage and much more. We fit new kitchens, stairs, doors and windows, all carpentry work undertaken. We have many passed clients who are happy for us to pass on their details as a reference for new clients to use. We are also licensed waste carriers specialising in small loads of, mixed waste, rubble, timber and metal etc.
A straightforward job done promptly and professionally.
we are a small family run business with over 20 years experiance we pride ourselves on work by recomendation.We are gas qualified engineers and specialize in boiler refitts and all aspects of the plumbing trade with a no job to big or small
Quick response, on time, efficient friendly and helpful. Faced with a problem happily found a solution.
A joiner by trade but an experienced tradesperson in a number of home related areas including kitchens, bathrooms & maintenance
MW Stone Builders
Cellar & Basement Conversion
Hi I’m Mike I Started life in the building trade 40 plus years ago as an apprentice Bricklayer. The following years I have spent mostly in domestic construction from chimney and fireplace construction to extension and house alterations. I run a small team of trades people who work to a very high standard.
We are ssmART Build & Design Ltd. Our team pride themselves on We are ssmART Build & Design Ltd. Our team pride themselves on their diligence and painstaking attention to detail. We are a seasoned team of quality builders who have been helping homeowners London area for some time. We have an experienced and disciplined team who have completed many projects throughout our area of operation; indeed we can help you complete all types of home improvements and extensions/conversions. We pride ourselves on our impeccably high standards and always strive to deliver on time and within budget. We can help with all of the following and more: • Extensions (both single and double storey) • Loft Conversions • Basement Conversions • Garage Conversions • Kitchens • Bathrooms and wet rooms • Exterior and Interior painting and plastering • Plumbing, electrical work and carpentry • Annexes • Replacing both wooden and PVC doors and windows We are always delighted to meet our prospective customers face to face to discuss their requirements. We look forward to hearing from you soon.
I found Lorand to be very professional in his craft ,friendly individual and very reasonable priced. I would highly recommend his work in extensions,brickwork etc.
MEMAAR Construction is a business specializing in refurbishment, renovation, extension, painting, flooring, decoration, tiling, and demolition services. With a commitment to quality craftsmanship and a customer-centric approach, MEMAAR emphasises personalised service and priorities client needs. The business is supported by an expert team in the construction industry and aims to use sustainable practices while offering affordable pricing without compromising quality.
RPIOS LIMITED
Cellar & Basement Conversion
Our company is made out of hard working individuals with more than 30 years experience in the construction industry. We are specialised in loft conversions even though we can do any construction related work in any buildings. We have experience in loft conversions, painting, tiles placement, shutter carpenter work, brick work, laminate flooring, insulation placement, kitchen and bathroom fitting, plasterboard placement and many more. As we are new to this website we would appreciate some positive feedback after finishing the related work.
LK Designs London specialises in the design and installation of all types of building projects including kitchens, bathrooms, extensions and loft conversions. We have thirty years experience of turning a client's vision into reality. We are a professional, creative and dedicated team that can take your project from beginning to end and we give our clients peace of mind with the service we provide. Our 5 star reviews are testimony to this high quality service.
Welcome to ross property repair family run business with 20 years experience in property repairs & maintenance our professional, efficient and reliable handymen are just one call away to fix all your �to do� list with no hassle involved. Ross property repair is the best solution for all your property maintenance needs, no matter how small or how big the job is. We serve both commercial and residential customers in Edinburgh, Lothian and Scottish Borders area. By choosing Ross property repair you are guaranteed: Job done at the highest standards on every visit Agreed appointments and timing followed No mess left behind when job is done You pay just for work done . We pride ourselves on the high standards out work is finished to . First class workmanship at affordable prices . Below I have listed some of the services we offer Letting agent and landlord services Rot and mould Mastic and silicone replacement Handyman services All aspects of joinery work Tiling Wet wall panelling Painting and decorating Small plumbing jobs Laminate flooring , carpets ,linoleum ELECTRICAL New sockets or extra sockets New light fittings Fit cookers Exterior garden sockets EXTERIOR Decking Slabbing Build Huts Fencing Build small walls Gutter repairs and cleaning Slate repairs Flat roof repairs SMALL JOBS Plasterboard repairs New toilet seats New door handles Shelving Cleaning services on request All aspects of gardening and much more, to much to list! ANY JOB BIG OR SMALL WE DO IT ALL We are FULLY INSURED
RAR offer a full hard landscaping, groundwork and building service, including but not restricted too, ~ Patios ~ Paths ~ Drive ways ~ Fencing ~ Turf ~ Bespoke timber structures ~ Sleeper work ~ Ponds ~ Small and medium sized building jobs ~ Garden clearance Specialising in low maintenance gardens. with over 20yrs experience in these sectors I offer high quality and am happy to chat through what is required.
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