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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

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.

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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

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
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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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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.

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My name is Dean. I am a good reputable builder. I am a bricklayer & roofer by trade. I am reasonable on price but we don't cut quality we only use the best materials.Being a general builder I offer all services , roofing, brickwork , groundwork, fencing

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Reviewed by Al on 11/7/2024

We are very pleased with the work that was done. There was a quick response to the job that day via a telephone call. An appointment was scheduled for a couple of days later and the work was started early that day & completed that same day. The workers were on time, polite, knowledgeable and proficient. They promised to make a visit a week later to remove the supportive structure and did exactly so yesterday. I am very pleased with the work and their professionalism.. i highly recommend them. Well dodone

Our commitment to superior craftsmanship, unwavering dedication to safety, and a relentless pursuit of innovation have set us apart. We take pride in transforming ideas into tangible structures that stand as testaments to quality and durability. Our Core values are “”QSIC”: • Quality: We are committed to delivering top-notch construction, ensuring that every project meets the highest standards of craftsmanship and durability. • Safety: The safety of our team and clients is our top priority. We maintain rigorous safety protocols to create secure work environments. • Innovation: We embrace cutting-edge technologies and sustainable practices, staying ahead of industry trends to offer modern, efficient solutions. • Client-Centric: Our clients are at the heart of everything we do. We listen, collaborate, and tailor our services to meet their unique needs and vision. Our Services: • Houses and apartments full refurbishment and renovation, Carpentry, plumbing, Electrical work, Heating, Painting and decorating, Roofing, Flooring, tiling, demolition. Etc. Why Choose Us: • Experienced Team: Our team of skilled professionals brings expertise and creativity to every project. • Proven Track Record: Browse our portfolio to see the diverse range of successful projects we’ve completed. • Transparent Communication: We believe in open and clear communication throughout every phase of the project. • Sustainable Practices: We’re committed to environmentally friendly construction methods and materials. Let’s Build Together Whether you’re envisioning a dream home, a modern office space, or a community-enhancing project, ACB Construction is here to bring your vision to life. Discover the difference that experience, quality, and dedication can make. Contact us today to start building your future with us.

We are a family run business with over 30 years in the trade we take pride in our work

I am builder I have been working from last 9 years in this building industry And trying to provide quality work to british standard I can do any kind of building job If you need my any help Feel free to contact me

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Reviewed by Cameron on 7/5/2026

Welcome to Iosip Construction, where craftsmanship meets dedication! Founded by Ioan, with over 16 years of construction experience in both England and Romania, we take pride in delivering exceptional quality and unmatched expertise in the construction industry. At Iosip Construction, we are committed to hard work, ensuring that every project is executed with precision and excellence. The services we offer include: - Extension construction - Loft conversion - Porch construction - All aspects of Rendering & Plastering - Tiling - Full House Refurbishment What sets Iosip Construction apart is not only our wealth of experience but also our unwavering commitment to customer satisfaction. We strive to make the construction process enjoyable for our clients by providing transparent communication, reliable timelines, and, most importantly, by ensuring that you are delighted with the final outcome. Our experienced team of five professionals is dedicated to delivering high-quality results in each of these services. From expanding living spaces to enhancing the aesthetic appeal of your home, Iosip Construction is your trusted partner in construction excellence.

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Reviewed by Dewang on 10/10/2017

Excellent tradesman with very good skills and very reasonable. The quality of the work is very good and people are also trustworthy.

We have over 15 years of experience in the building, plumbing and heating industry. We carry out all works from reactive maintenance to full renovations, complete landscaping and heating installations.

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Reviewed by susan on 24/11/2023

Would definitely hire again

24 YEARS EXPERIENCE ON Builder Contractor With my team we did from Garden Landscape all the way to new build yet making sure Clinet saves and reaches his goal on they projects. We are qualified Gas safety Electrical Plumbing Solar Heat pumps We specialaise on: Loft conversion Bathroom Kitchen Extensions Paiting and Decorating Plumbing Roofing Garden Landscaping Insured and insurance backed guaranteed services

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Reviewed by Sheila on 26/4/2026

Liightbox Construction is an Architectural design led construction company. We are experienced in delivering projects of various type, sizes and complexity from commercial hotels and restaurants to private prime apartments and houses. We have an enthusiastic team of hands-on project managers and dedicated professional craftsmen ready to deliver collaboratively successful projects for our clients. The majority of the architecture projects we take on we carry out through to construction completion. This allows us to navigate these jobs to their most desirable solutions. We take great care when estimating our projects and keep to budgets and deadlines, advise on build-ability issues and solutions. Anything is possible in tyhe spirit of collaboration and careful planning.

Voytek avatar

Voytek

Cellar & Basement Conversion

Painting and decorating and all types of works around your house, internal and external.

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Reviewed by Sebastian on 31/1/2026

We are a family owned general building specialist company with over 10 years of experience in UK, providing bespoke installations, tilling, plumbing, plastering, brick laying, paving, garden walls, extensions, loft conversion. All work undertaken.

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Reviewed by Ross on 3/11/2021

Excellent Job, quick performance, courteous staff. Would certainly use again.

Phoenix Construction continues to provide quality and efficiency on all manner of projects. We have been in the industry for over 40 years. We have an excellent reputation. We Mainly Focus on: Extensions Driveways Roofs Full renovations Bathrooms Kitchens Loft Conversions and many more... We look forward to hearing from you.

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Reviewed by Simon on 7/10/2025

Made a total mess of a small extension. Quoted 2 weeks and after 7 I sacked him off as we were going nowhere. Massive list of his work didn’t comply with building regs and ended up fitting a purlin to roof as he used wrong sized joists. I now have bits of roof hanging off after max 30 mph winds Even managed to cock guttering up so down pipe is nowhere near drains. Roof leaking and I have had to sack him off and pay another load of cash to a set of lads who can do the job. Avoid or he’ll bankrupt you

Lee Baker avatar

Lee Baker

Cellar & Basement Conversion

My name is Lee, I have been in the building trade for over 15 years. Working with my family. Have many years of experience ranging from small and not so small private jobs to larger scales jobs (schools colleges etc) crb checked and insured. Can provide customer references if requested.

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Reviewed by paul on 30/7/2019

i originally got lee in to do some plastering on a renovation i was doing. he done a fantastic job. since then he has done a wet room and two bathrooms to a very high spec. i have also asked him to render the outside of the house which he is now in the process of doing. I am very sure i will use him again in the future. Top man and very approachable

Martin Building Ltd Established in 2003 With a large portfolio of previous projects available for you to see yourself, available to view on our website. Regards Carl Martin

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Reviewed by Darren on 27/11/2019

Carl and his team did a fantastic job when working on my garage extension and conversion project. It was the first time that I’ve ever done this type of thing but Carl’s communication was spot on from start to finish. He was courteous and communicative throughout and talked me through each day where the project was at and what was next. If I had to appoint a builder again for whatever reason I wouldn’t hesitate in appointing Martin Building Ltd to complete the job. Thanks again Carl!

Family business with over 35 years experience. We are a multi trade business and can undertake everything from drawing up plans to laying carpet. We are also contractors for a number of local authorities.

York groundwork solutions offer a wide of skills to do your chosen project from foundations, drainage, paving, Tarmac, 360 hire, landscaping. We offer competitive prices and all our staff are cscs card in health and safety and cpcs trained.

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Reviewed by Davide on 19/4/2018

They worked hard and finished the job on time. There were some unexpected costs but they did a very good job.

Amistad has been in the industry for 9 years, has a wealth of experience and is fully qualified in all aspects of property management and maintenance. With offices in Royal Wootton Bassett, Amistad has a large number of local Contracts

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Reviewed by Leon on 13/5/2019

Guy rang up and arranged a time and date to survey and quote. Waited for over an hour. Rang him twice then gave up, so rang him a third time and told him not to bother. Wasted my time which I took off of work.

Building contractor undertaking various home improvement projects including bathrooms and kitchens design and installation, extensions and loft conversions, decorating and maintenance, electrical and central heating works. All work guaranteed. Please visit our website for more information on Google search. Customer feedback can be found searching myBuilder under Braerise UK Ltd.

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Reviewed by Christina on 20/11/2023

Really professional! Had a stud wall removed from Kitchen and you would never be able to tell there was a wall there previously. Excellent throughout, would highly recommend!

I have around 15 members who work for you. Our Services are: 1. Bathroom Fitter 2. Builder 3. Carpenter 4. CCTV 5. Cleaner 6. Drain Specialist 7. Floor Fitting 8. Gardener 9. Handyperson 10. Loft conversion 11. Paint & Decorating 12. Plaster 13. Roofer 14. Tiler 15. Window fitter

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Reviewed by Kay on 22/10/2022

Wasted my time , lied and did not show up , uses another email to reply [email protected]. Very dodgy guy . No good .

R&R Builders is a leader in providing value-added construction services to our customers by creating a successful partnership with them throughout the construction process. Our pledge is to establish lasting relationships with our customers.

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Reviewed by Eden on 31/10/2025

R&R done an excellent work replaced the whole bathroom including the flooring. Very professional, punctual and gets the job done at a reasonable price. Highly recommend him to anyone who is looking for bathroom work. Thank you, Eden & Kristian

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