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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

Find everything you need to know about hiring a local cellar conversion specialist. Extend or renovate an existing basement, or excavate a new one from scratch.  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

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.

Transform your underground spaces into useable rooms with the help of a skilled cellar conversion specialist in your local area.

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.

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Picture of a basement converted into a living room with grey sofas and a glass panel staircase

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:

  1. Are a skilled company with a strong history of high standard projects
  2. Have all the licenses and insurance needed to protect you and their workers
  3. Have a good range of positive reviews from previous customers vouching for their reliability
  4. Are available to carry out the work in the timeframe you need it by
  5. Are quoting a price and payment option that you are happy with, having compared the quote with other basement conversion companies

A local basement conversion specialist is more likely to respond quickly as they’ll be right around the corner and ready to help.

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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.

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Do I need planning permission for a cellar conversion?

You won’t need to apply for permission for a cellar conversion, as long as:

  • You’re converting an existing residential basement into a living space
  • How you’re using it isn’t significantly different and the basement isn’t a separate unit
  • You don’t alter the external appearance of the property, such as by adding a light well
  • You don’t live in a listed building

Excavating a brand new basement which involves major works is likely to require planning approval.

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.

Picture of a basement converted into a living room with wooden staircase, wooden floors and cream coloured walls

Questions to ask before you hire a basement conversion specialist

Whether you’re looking to build a brand new basement or simply want to extend or improve your existing cellar, there are a few questions you should ask before you hire a specialist to excavate your new room:

Do you have public liability insurance and what does this cover?

While it’s not a requirement for them to have it, it’s a good idea for your basement conversion specialists to have public liability insurance to cover you and them against any accidental damage done to your home or personal injuries. Make sure to always ask your tradespeople what insurance they have before you hire them. This will guarantee protection for both parties.

How many years of experience do you have?

Knowing how many years of experience your basement conversion specialist has will allow you to pick a tradesperson who you are confident has enough experience to carry out a high quality job. When you’re finding a tradesperson through Rated People, head over to their profile to check out the pictures on their work gallery and their ratings and reviews.

Do you use subcontractors? If so, are they licensed and insured?

Your basement conversion specialist is likely to employ subcontractors. It’s a good idea to confirm the qualifications and insurance coverage of everyone who will be working on your project, including surveyors, structural engineers and electricians. Anyone working with gas needs to be registered with Gas Safe, and anyone installing electrics (in England and Wales) needs to be Part P certified to be able to self-certify their work. These tradespeople will have valid documentation that you can ask to check.

What is your estimated timeline for completing the project?

Knowing what the estimated timeline for completing the project is will help you set realistic expectations about how long your basement renovation will take to complete.

How much will the job cost?

Asking how much the job will cost will help you budget for your project and will ensure price transparency before you hire. How much you’ll end up spending depends on the scope of your project, and where you live in the UK, so make sure you add plenty of details when you post a job.

Find a basement conversion

We are a general building and maintenance company. We cover all aspects of building from small maintenance items to full refurbishments, conversions and extensions. We have over 30 years experience and all our operatives are time served tradesmen. We pride ourselves on our quality of work and always price competitively. No job is too difficult and we specialise in structural work, composite walls, dry rot and other challenging jobs which we will execute and resolve at an extremely reasonable cost. We also attach a 'no quibble guarantee' on all our work for your peace of mind. Although we are geared mainly to commercial customers we welcome residential homeowners as well. Please feel free to email me or call me and I will be happy to discuss your requirements with you. We offer free estimates, are fully insured and can provide references if required. Andrew Truby Company Director AVT Building Solutions.

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Reviewed by Jane on 20/9/2024

Much care was taken to replicate the original porch - an excellent job.

Here at JBL PROPERTY MAINTENANCE AND RENOVATION LTD/ We offer a range of services from interior to exterior of your property. It's a new company established 2023 but all out tradesmen and women have numerous years of experience and have to complete a test of jobs to see if they are competent and reliable before we hire any persons. We have a high standards for any work carried out by our company and give warrenty on all our work. We also value our customers and their loyalty with a membership scheme which gives you 10% on all work carried out. Builder Brick and block work Render/ plaster Flooring/ all types of flooring Painting and decorating Window and door installation Kitchen installation Bathroom installation Extentions and out houses or offices Fencing Driveway and patio Turf and artificial grass Landscaping Roofing Guttering/facia/soffit Garage conversion Loft conversion Inside and out side complete renovation

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Reviewed by Barbara on 25/6/2024

John did do a good job when he decided to turn up. However, he was not reliable and would always ask for money upfront..Also , he never came back to finish the job, even though he was paid to.

H&R Renovations ltd always aims to deliver a high standards of work qualities to satisfy all my clients expectations and meet theirs satification.

Over the years of being in the construction industry we pride ourselves in effectively carrying complete house renovations ,new kitchens and bathroom installations ,plastering, tilling, plumbing, painting and electrical works, consumer units,complete rewire, inspection and testing,and we Part P Registered under the NICEIC brand.

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Reviewed by Leo on 24/7/2020

Sylvester arranged and managed the refitting of my kitchen - plastering, plumbing, cabinets, tiling. Even Replacing joists and floorboards (I had a wood worm problem). We could not be happier with the result and Sylvesters accommodating attitude towards much unexpected/unplanned work all carried out within quoted timeframe. Could not rate him higher! As an electrician he refitted a few of our lights and provided a valid certificate for all work done. Very professional and tidy.

We do all aspects of building work Roofing, patios, driveway, decking, painting, electrical and more

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Reviewed by Lisa on 14/5/2023

Reliable, friendly, am really pleased with the work they did. Would definitely recommend.

Five Star Construction is a family run business with the aim to provide affordable handyman and development works. We are full insured and all our operatives are fully trained for the work we carry out. Our friendly team are awaiting your call

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Reviewed by Thomas on 30/4/2024

Good value Very profession Quick and tidy workman Would definitely use them again. Regards Thomas

John McKinney Builders have been building on over 50 years of experience, established in 1970. We carry out extensions, loft conversions, refurbishments, garage builds & conversions , kitchen fitting , heating etc. From planning to completion. Our quality of workmanship & finish is second to none, no snagging needed or call back. WE SPECIALISE IN THE INSTALLATION OF RSJ,s

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Reviewed by Becky on 6/4/2022

Good, conscientious company. High quality work. Orders completed on time, professional service and honesty to their customers.

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Reviewed by Richard on 15/5/2024

Work to retile the bathroom was scheduled promptly and delivered very well, on-time and in line with the quote. Wouldn't hesitate to use again. Tidied up and left things looking smart.

Profesional service.. To many years to mention in business. And all work carried out 100% satisfaction guaranteed.

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Reviewed by William on 22/6/2025

Excellent work and service, would certainly use again. Bill Walker

Excellent time served Plasterer with 16 years building experience all over the UK .No job to small and always to highest standard possible. Experienced with:Skimming,Boarding,Damp proofing, wall removal (Steel work), extensions, Rendering, roofing, tiling, bathroom fitting Coving,brickwork , joinery. All work is guaranteed . Give us a call for your free quotation

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Reviewed by Michael on 3/3/2025

Brilliant job! Shaun and his team were very punctual arriving early doors and worked non-stop. Did everything we asked for to a very high standard nothing was a bother. Lovely group of lads who we'd highly recommend! Thank you!

DURA POWER LTD is a company that specialises in refurbishment and new build projects, particularly in the education, healthcare and commercial sectors. With extensive experience in these fields, we offer a value-added approach and understanding of our clients’ requirements. We maintain strong relationships with a wide variety of tried and tested subcontractors. This strong supply chain enables us to provide flexibility, manage change and maintain quality. We are capable of handling tendered or negotiated projects . Our financial strengths come from a commitment to reinvest, ensuring a sound financial base is maintained without external borrowings. We have a team of directly employed professional staff who deliver a cost-effective, timely, and high-quality construction solution. Our core team of tradesmen delivers consistent quality and has the ability to be flexible and reactive to requirements. Our long-lasting client partnerships are a testimony to the exemplary service we provide. This level of customer satisfaction, repeat and referred business forms the foundation of DURA POWER LTD success. Our approach is sensitive, innovative and bespoke, driven by challenging and constrictive working environments. We are committed to achieving the optimum solutions across our service delivery, considering logistical aspects to ensure customer satisfaction.

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Reviewed by Andreea Mirabela on 10/10/2025

CG Building LTD , it is a small company , established back in 2016. We carry work all around UK , but now we are based in Somerset and we cover all surrounding areas. •We take small & big jobs ! •We do all aspects building •We offer a friendly and reliable service, working closely with the client to make sure they have a clear understanding of the works that are being carried out throughout the process.  -Renovations- - Kitchen and bathroom insulations- Plastering. - Painting and decorating. - Carpentry-

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Reviewed by Rickie on 15/3/2023

Very professional. I would definitely recommend this trades person. Good pricing and great work. I am keeping his contract for work in the future.

Local reliable and professional refurbishments from leaking taps to full remodelling and project management

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Reviewed by John on 27/3/2025

Excellent work from Paul. He arrived on time and completed the work and left the area neat and tidy. Will definitely use Paul for future jobs.

We are a local building company, experts in extensions and refurbishment with over 30 years experience. We have fully qualified tradesmen and public liability insurance. References available, no upfront fees and honest advice. Our latest project involved raising the roof level of a bungalow, extension and complete internal alterations. Before and after pictures below.

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Reviewed by Raymond on 11/5/2022

Wow, that was a long time ago and I forgot to leave a review! All I can now confirm is that the job was completed and to my complete satisfaction.

Welcome to UV Interiors! Your number-one construction company in North West London, and the surrounding areas. With over ten years’ worth of combined experience, our commercial contractors have become industry leaders in their field. For the past decade, we have been delivering high-quality construction services to the community. As a result, we have been building up a large pool of satisfied customers in the area. Some of our services include: Property Renovations Painting and Decorating Kitchen Renovations and more! So, if you are looking for a particular service, we may have a team waiting to help. Take a look at our services and get in touch with us using the details below. Our expert commercial contractors in North West London would love to hear from you!

Welcome to HOME IMPROVEMENT PROJECTS & SERVICES (HIPS HOMES) Ltd, where excellence meets integrity. We offer a wide range of construction services, ensuring quality and efficiency in every project. Discover our outstanding reviews and let us help you make hips of SAVINGS on your budget, add VALUE to your property, and enhance your own and or your tenant's COMFORT. #HipsHomes #HomeImprovement #TrustedBuilders #QualityCraftsmanship

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Reviewed by Farrukh on 10/10/2024

Ernest is a very hardworking tradesman. He replaced locks for us.

K&M BUILDING SYSTEM is a business that specialises in all aspects of building. From extensions to driveways, kitchens, bathrooms or demolition. No job is too big or too small. We are fully covered with public liability insurance giving us and our customers peace of mind when carrying out your project. We always aim to complete your job on time to a very high standard with very competitive prices. We provide building services across Edinburgh – 7 days a week.

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Reviewed by Donal on 11/1/2025

Here is a description about my company testing 2 updating just testing

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Reviewed by Rated on 29/10/2024

Test without the bad word

About Andrey's Property Services. Thank you for looking at our profile page here at Andrey's Property Services. We are a team of highly skilled multi-talented tradespeople and between us we can do pretty much all work required in your home to a very good standard. This can be confirmed by looking at our excellent reviews and pictures of our previous work. Some of the things that make us stand out from the rest - NO UPFRONT DEPOSITS We only ever ask for payment once the work is complete and you have had a chance to make sure you are totally happy with everything. WE DO EVERYTHING Why have multiple tradespeople or multiple companies working on the same job when we can manage the whole project start to finish and take responsibility and ownership for everything. REVIEWED & CHECKED We have been through numerous checks into our background by independent organisations including TrustATrader and others that you can find on our website Including criminal background checks, public liability insurance checks, necessary qualification checks. ALL WORK GUARANTEED At Andrey's we are so confident in the quality of our work that we offer a full one to ten year guarantee on any work we do, totally free of charge. This combined with our 1 million pound public liability insurance should give you full confidence in Andrey's Property Services.

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Reviewed by David on 7/10/2025

AVOID AT ALL COSTS. Andrey completed work under contract with guarantees, but within 2 months the exterior paint peeled off & looks awful. After acknowledging the poor workmanship, Andrey has systematically avoided all accountability - dodging calls, breaking promises, and blatantly refusing to honour his contractual obligations. A complete lack of professional integrity, despite us having all records of communication - he cannot be trusted to stand behind his work.

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