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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.

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Experienced creative and versatile in carpentry and woodworking with background in residential and commercial construction and remodeling to include framing, trim, windows, doors, and siding. In-depth knowledge of construction process from material selection, techniques, tools and equipment to quality assurance, cost control, and safety. Accurately read blueprints, project plans, and specifications; determine material needs, estimate costs, and prioritize tasks to minimize production delays. Proven expertise in project / team supervision; excel at communicating with clients, architects, and subcontractors to deliver results within budget and stated requirements. Possess full range of quality tools, reliable late-model van, and excellent driving and attendance record. I’d like to add that over the years I have met some good tradesman in all fields of building and have made relationships with them having worked on various projects together, so if I job requires additional trades I’m happy to recommend trusted people. Thanks for reading

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Reviewed by Cath on 24/9/2024

We are well established building company covering the gloucestershire area. All Building,Landscaping & driveways work undertaken. We offer a 5 year guarantee to all project & offer testimonials to all customers. We can also assist with design on any potential projects.

Im a builder/plumber with experience.

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Reviewed by Lindsay on 26/8/2024

Lucasz did a brilliant job for us he was timely tidy and took a real pride in his work coming up with a great solution for the issues with our kitchen. I cannot recommend him enough to you excellent in all respects and a fair price

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 have over 12 years experience in internal plastering and external rendering. We cover all aspects of plastering including Venetian (polished plaster) and microcement.

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Reviewed by Viktors on 18/11/2024

the worst job ever i have seen i hired anthony as a professional to do some finishing touches on venetian plaster but he didnt do it he took a deposit then he disappeared for three weeks telling stories that he was sick or he didn't have time when he finally came to do the job he did it even worse than before came with one can of filler and made my walls a ugly color arguing that they couldn't be done better didn't return the deposit! i don't recommend it to anyone, do not pay deposit this person

Hi I have been a joiner for a little over 10 years now, I did my apprenticeship as a bench joiner so attention to detail is key for me. Me and Oskar my apprentice always finish jobs to a high standard. As with Stuart my painter who's eye for detail is second to none We have public liability so are insured for all jobs we take on. We enjoy our work and customers satisfaction is key.

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Reviewed by David on 25/11/2024

Gordon is a time served chimney sweep with over 30 years off experience in all types of chimneys and flues including fitting all types of chimney cowls and caps, we also repair,take down, repoint and lead flashings. Anything to do with you chimney we can help you with, there's no call out charge for free quotes and advice We hold a two million pound public liability insurance which includes working at height

Our family has been mastering our trade for over 25 years, with two generations currently involved. We take pride in offering extensive knowledge and assistance to our clients, covering a wide range of areas when it comes to renovations and refurbishments. From the start of the project to its final completion, we offer help, guidance, advice, and assistance to create the perfect interior and exterior. Our services include comprehensive flooring solutions such as tiling, laminate installations, underfloor heating, and more. We also specialize in drywall/plasterboard installations, including unique shapes with hidden lights, cornices, and wallpapering. We are experts in every aspect of painting and decorating, and our true passion lies in creating bespoke, one-of-a-kind decorative plastering designs that offer limitless possibilities. From silky-smooth, polished, or shiny finishes to bold pearly effects, rough 3D-looking designs, and much more. We can even create custom-made paintings on almost any surface, including walls, ceilings, and mirrors. You can trust us to bring your vision to life with our exceptional craftsmanship and attention to detail.

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Reviewed by Jos on 28/6/2024

I advertised for a Painter Decorator having looked Mr Art rating I chose them. Their work was unbelievably good well beyond my expectation, from the day they started they were punctual and hard working very skilfull no job was too hard for them. When they completed they left my property in clean state. I would use them again any time.

Contact us for a quote (Detailed estimates and surveys are chargeable ) https://www.rbbrefurbishmentsltd.co.uk Bathroom refurbishment Kitchen refurbishment Howdens kitchen supply and install service Decommission/ fit outs Removal of partition walls Wall panelling Media walls Design & planning Garage conversions Loft conversions Access to architect Access to structural engineer Steel rsj supply and install Full house refurbs Velux and windows supply and install

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Reviewed by Gerard on 4/2/2024

All good

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Reviewed by sofia on 22/11/2024

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!

At ICON_Interiors , we are a family-oriented construction business with over 15 years of experience delivering high-quality building services. From kitchen and bathroom installations to full house renovations, loft conversions, and restaurant refurbishments, we pride ourselves on being able to take on projects of all sizes—no job is too big or too small. Our team brings a vast knowledge of various trades, allowing us to handle all aspects of construction with confidence and skill. We also collaborate with a trusted network of specialist tradespeople to ensure every project is completed to the highest standards. Whether you're planning a small renovation, a major extension, or any construction work in between, we are committed to delivering exceptional results. With numerous satisfied clients, glowing references, and a portfolio of completed projects, we are confident that we can bring your vision to life. Contact us today to discuss how we can help with your next project!

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Reviewed by Cecilia on 11/12/2024

Jamie was so accommodating and skilled, really friendly and hard working, it was an awkward room to lay the carpet in and looks great

Apex is a maintenance service company, specialising in Plumbing, Heating and General Building. Our experienced team offer a host of skills, covering many different sectors to allow us to be your one-stop shop. So whether you're a domestic customer with a plumbing and heating issue, or, a domestic client requiring general property solutions, we can tailor your needs under one roof. Our team is fully insured and with over 30 years of experience, we're the go-to company for plumbing and heating, with a quick-to-action call-out priority covering Oxfordshire, Bucks and Berkshire.

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Reviewed by Sri on 4/1/2024

Fantastic job. Clear communication and completed the work within time. Will recommend whole heartedly.

We are one of the best building and renovation company in London since 2011. Our experience taken over many years and different architects helping us to provide a service meeting the highest quality standards in every detail, making our homes and city beautiful...

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Hello im Valentino, professional painter and decorator with 18 years of experience, good communication with customers, dynamic, hardworking, with high quality standards and qualified with NVQ level 3 painting and decoration.

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Reviewed by Timothy on 1/3/2024

Are you in search of a reliable and experienced building and landscape company? Look no further than LT Construction & Landscape Ltd! With over 20 years of experience, we have established ourselves as a professional, family-run business dedicated to providing top-notch services to our clients. From painting and decorating to new build extensions and garden services, we offer a wide range of construction and landscaping solutions to meet your needs. Whether you are looking to renovate your home or create a stunning outdoor space, we have got you covered. At LT Construction & Landscape Ltd, we take pride in our work and strive to exceed our clients' expectations. Our team of experts is committed to delivering high-quality results, ensuring that every project is completed to the highest standards. What sets us apart from other companies is our dedication to customer satisfaction. We understand that every project is unique, and we work closely with our clients to ensure that their vision comes to life. We prioritize open communication, transparency, and integrity in all our interactions, creating a seamless and stress-free experience for our clients. As a token of appreciation for choosing us, we promise to beat any quote you've had. This is our way of saying thank you for trusting us with your project. We are confident in the value we bring to our clients and are committed to providing affordable solutions without compromising on quality. So, if you're in need of reliable and professional construction and landscape services, look no further than LT Construction & Landscape Ltd. Contact us today for a free quote and let us help you bring your vision to life. #construction #landscape #building #renovations #freequote ????????

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Reviewed by Jason on 29/11/2024

Alliance building and landscapes Ltd are a family run business here at alliance we make sure all works is completed to customer satisfaction,no job to big or to small,contact us today for a free quote,book once,book right,book alliance

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Reviewed by Doreen on 4/3/2023

"Here at AAR plastering & building services we have a wealth of knowledge throughout all the plastering and building sector, please get in touch for your free no obligation quotation today"

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Reviewed by Claire on 27/9/2024

Exterior masonary repainted on the front and back of my house. Alan arrived on time, very helpful, polite and extremely tidy. Professional finish and service, I'm very pleased with the work , Great job at a good price, I would definitely recommend.

What makes us the Best We are a reliable, punctual, tidy and most importantly a friendly team that you can rely on. WE ALSO PROVIDE A GENERAL BUILDING SERVICE which include .PAINTING,TILING,PLUMBING,BATHROOMS AND KITCHENS,FENCING,PATIOS AND MUCH MORE Our customers are our number one priority, and we carry out each job to the highest standard of workmanship. Call us today for free advice and quotations

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