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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:

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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

Welcome to GJ home improvement your comprehensive flooring and construction solution in Durham. Led by Gareth and his dedicated team, we take pride in offering a diverse range of services to transform your spaces into functional, stylish, and efficient environments. Flooring Expertise: At GJ Floor Screeding, we are your go-to experts for all things flooring. From gas membrane installation to underfloor heating, concrete, dry screed, and wet screeds, we handle it all. Whether you need a complete flooring overhaul or just repairs, our skilled team ensures a flawless finish and durability that stands the test of time. Beyond Flooring: Our expertise extends beyond flooring. GJ Floor Screeding is your partner for a variety of projects, including block paving, decking, bricklaying, and full garden renovations. We specialize in creating outdoor spaces that are as stunning as they are functional. Roofing and Guttering Repairs: In addition to flooring and outdoor projects, we offer roofing and guttering repairs. Our team is well-equipped to handle a range of roofing issues, ensuring the integrity and longevity of your property. Why Choose GJ home improvements Versatility: There's no project too big or too small for our team. From intricate flooring solutions to outdoor renovations, we have the expertise to bring your vision to life. Quality Craftsmanship: We prioritize quality in every aspect of our work, delivering results that exceed expectations. Comprehensive Service: GJ home improvement is your one-stop-shop for a variety of construction needs, providing a seamless and efficient experience for our clients. For all your flooring, outdoor, roofing, and guttering needs, GJ Floor Screeding is here to assist. Give us a call, and let's discuss how we can turn your project into a reality. Thank you for considering us for your construction endeavors. Many thanks, Gareth, and the GJ Floor Screeding team.

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Reviewed by Nicky on 17/4/2024

Great quality work at an excellent price. I was given an accurate quote and work was carried out to a very high standard. I would recommend them to anyone!

We are a family run business, and although new to the Rated People website for 2024, we have gained over 25yrs of knowledge and experience in dealing with damp and mould in properties. Understanding the issues these cause, we know how to fix them while keeping within a reasonable budget. There are numerous ways these issues arise and we take our time to survey your property to find the cause, advise you on the cure, and help you to have a dry, healthy home. Contact us today to find how we can help you. We cover all of Merseyside and surrounding areas, and can survey your property for you, within a few days to a week. We are certified installers of the damp and remedial products we use and have completed the Pam Ties and Safeguard Damp proofing course, to give you the peace of mind that all our work is undertaken correctly and to the required accordance with British Standards using fluid, approved by the BBA and we adhere to the code of practice laid down by the British Standards Institute. We can undertake any instruction, from an independent damp, timber and mould survey which will be approved by your mortgage lender, right through to a full damp course, wall tie replacement, brickwork pointing, Mould sanitisation, timber replacement, basement tanking and also wall insulation. We have also experience in full property refurbishments and project management of large conversion projects and have numerous trusted tradesmen who have worked for us for decades. Should you require any other jobs doing, please just ask. Check out our excellent 5 star Google reviews to see that we care about our customers and make sure we turn up when we say, do what we quote, and leave your property in a clean tidy state. Call us today to fix your damp and mould problems!

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Reviewed by Ben on 13/5/2024

4 months?Done the job feb, rang you march, you gave advice and we put 2 fans on the wall for a month and rang you back to say wall didn’t dry. I’ll post all the photos up of the job including the rusted beads and beads put over the top by your lazy plasterer and let’s remember I said cancel your plasterer when you didn’t do the job I thought you were doing and pay you just for what you done. The evidence is there for people to decide

Welcome to Trusted Maitenance- your local, reliable service for a wide range of maintenance jobs around the home. We have been working with many happy customers around Central London areas and also with local councils Please give us a call for a quotation for any of the following:

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Reviewed by Toby on 18/1/2025

Trusted Maintence did an excellent job building a bespoke cupboard for my living room. Karl was knowledgeable and took time to understand exactly what I was looking for. His measurements were precise, communication was clear throughout, and the pricing was very reasonable. The finished cupboard is exactly what I wanted, with a well executed replication of period charm. Overall, a professional and reliable service that I would use again and recommend.

General builders and energy saving specialists since 1994

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Reviewed by Pauline on 20/11/2023

Came out as arranged and said would give a quote for several jobs required including the damp repair .he said he would send quotes over on the friday 3rd november and am still waiting.

LOOK FORWARD TO MORE LIVING SPACE Do you or your family need more space? Maybe a house extension to provide a dining room or a new kitchen? Perhaps you’ve increased the size of your family and now need further bedrooms? Our experts can help you decide where and how you extend. Our services include: EXTENSIONS & PORCHES GARAGE & LOFT CONVERSIONS RENOVATIONS ROOFING - Flat Roofing - Conservatory Roofs & Roof Windows - Roof Repairs and Replacements - Fascias, Soffits & Guttering We use expert advice even before you finalise your plans. If you can’t build outwards have you considered a loft conversion? Our dedicated page will provide more information. Standard Building have helped many people extend their living space over the years and we never get tired of seeing satisfied clients enjoying their new found space.

Its quality time! With over 10 years experience, tens of finished jobs and tens of happy clients, I am a landscaper who can manage any job. Big or small, easy or complicated is never a problem for me. For any details don't hesitate to contact me.

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Reviewed by Ketan on 6/4/2024

Work that took place was amazing and recommend IA trader to anyone that needs work done.

Our company specializes in comprehensive renovation and finishing services, offering professional tiling, plastering, and smoothing, as well as bathroom and kitchen installation. We also provide plumbing services, carpentry and joinery, as well as flooring, window, and door installation. Our expertise includes building partition walls, painting and decorating interiors, and garage conversions. With years of experience and a commitment to the highest quality workmanship, we guarantee reliability, precision, and timely project completion. Our goal is to meet our clients' expectations through a professional approach and competitive pricing.

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Reviewed by Lesley on 9/5/2025

Prompt and professional from first meeting with Marek through to the end of the job. Roman transformed my hall, stairs, and landing, leaving an immaculate finish. Roman is also the tidiest painter I've ever seen. Thanks

DMH Group avatar

DMH Group

Cellar & Basement Conversion

DMH Group is a family-run business with over 15 years of expertise in providing comprehensive landscaping and building solutions. Covering a large area in the south east our team takes pride in offering a diverse range of services, catering to all aspects of landscaping and building work. From transforming outdoor spaces into beautiful landscapes to undertaking building projects of varying scales, DMH Group is committed to delivering excellence. No project is too big or too small for us as we strive to bring creativity, quality craftsmanship, and personalized attention to every detail.

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Reviewed by Stephen on 18/6/2025

Bradley did the job as asked , but never got back to me when I had a couple of issues, so for that reason I changed the review to 1

At Moss & Mortar solutions, we are committed to delivering exceptional workmanship and achieving the highest standards in all our projects. Our areas of expertise include landscaping, stone restoration, conservation and garden maintenance. We are dedicated to providing our clients with a professional and reliable service that exceeds their expectations.

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Reviewed by Nicola on 2/8/2025

Excellent work

I have been in the construction industry since I was 16 and now been working on my own for 4 years. We a a small family run business. Specialising in a variety of industries to cover most of any property maintenance and conversions. We also have other reviews on other sites too so please do ask and I’d be happy to provide them for you.

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Reviewed by Maggie on 20/6/2024

Az responded really quickly, came round when he said he would, assessed the job and did it straight away. He was happy to undertake what was a small job for him but a big headache for me. He also cleared up after himself! He was friendly and cheerful and instilled confidence. Thank you

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SC PRICOP

Cellar & Basement Conversion

Hi, I am Stefan, and I have three decades of experience as joiner, specialising in wood flooring and tiling, doors, wardrobes, decking, bathroom fitting and refurbishment.

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Reviewed by Christine on 30/3/2025
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Tudor Vlad

Cellar & Basement Conversion

Family company who started trading in 2013 .Our mission is to impact lives, offer our greatest services and advice to homeowners and to develop ongoing relationship for the future. In an ever more tough environment which is governed by the big companies we still believe that developing a good relationship with people is paramount. We always give 100% in order to deliver big or small projects on time with a great sense of duty and responsibility. This being said we are here to offer out our five star services to you in a way that we would like any business regardless of their domain to provide . Many thanks and God bless you. Tudor

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Reviewed by Travis on 13/6/2025

Tudor was phenomenal - arrives on time, has quality work, and provides exceptional advice. Would use him and his brother again in a heartbeat.

At Plumtree Home Improvements, we provide high-quality home improvements, driveways, and landscaping solutions to enhance both the look and functionality of your property. Whether you’re planning a home extension, an orangery, a new roof, windows, doors, or a stunning driveway, we have the expertise to bring your vision to life. Our services include: ? Home Extensions & Orangeries – Beautifully designed spaces that add value and style ? Roofing, Windows & Doors – Quality installations for durability and energy efficiency ? Driveways & Landscaping – Expertly installed resin, block paving, and imprinted concrete driveways, plus complete garden transformations ? Patios, Walls & Fencing – Creating stylish and practical outdoor spaces With over 15 years of experience, we take pride in delivering exceptional craftsmanship, attention to detail, and outstanding customer service. No matter the size of the project, we’re committed to quality from start to finish.

With over 10y on to construction industry,we operate a small family business owner aimed to provide an high quality services across the trades we offer, We have over 5y experience doing painting and decorating works leaving behind smile and the best experience, From Tv wall mountings to removals, storage ,and refurbishment,we cover all aspects of works . For a friendly man part of the team on site ,please don’t hesitate to get in touch with us..

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Reviewed by Jonathan on 18/9/2025

Fantastic experience - really lovely guys, great job and super reliable and professional. Look forward to working with them again soon

We are proud to be a top rated, reliable and well respected company with a fantastic team of experts providing outstanding levels of service when it comes to plumbing painting tiling bathroom and kitchen fitting and full house renovations in London and surrounding areas. We carry out all types of work, no matter the size - from small plumbing maintenance jobs such as leaking taps or burst pipes and other domestic work, right up to large installations such as Full house renovation. All of our work is fully guaranteed and we offer professional and efficient Handyman services near you at a competitive cost. Our aim is total customer satisfaction. Not only do we retain our client's custom over many years, they also become our ambassadors recommending us to their relatives, friends, neighbours and business associates.

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Reviewed by Wayne on 17/7/2025

Shout out to my brother from another mother. Pleasure having Nik and his boys Ray, Rod and John working on this project. Sometimes in life you have to take a leap of faith and Nik has 100% restored that faith with extreme commitment and professionalism on top of a beautiful finish.

Ruhulla Test

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Reviewed by New on 20/1/2023

DT Contractors is a growing business, established over 10 years ago and now run by two brothers. Various skills between both of us and our team. Can complete all sorts of jobs to the highest standard and great quality. No job is too small or too big for us! Just contact us, talk to us and we are sure we can find a way to sort whatever is required. ‘Impossible things - we are sorting staring away! Miracle - give us couple of days!’

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Reviewed by Russell on 19/7/2024

Came and looked at job quoted then didn't answer 3 emails

jandlroofsmart local family run company for over 20 years in the roofing trade

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Reviewed by Michael on 8/8/2025

The guys arrived on time as arranged. The work was completed within the time framework to a great standard. The guys were friendly and professional. I have no hesitation at all recommending them

1st Rate Roofing is a small company that values reliability and craftsmanship over anything else. We are polite and always put you first, making sure you understand whats being done and how we are going to do it. We always charge a fair price and believe you'll think so to. We provide free no obligation estimates. We are very responsive to emails and calls!

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