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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

Bristol House Extensions is a family owned business. Our workforce is fully qualified and experienced at working in domestic and commercial properties and carries out work for our customer, customer satisfaction is our main priority.

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Reviewed by Chris on 4/9/2024

Really helpful people to deal with.

I have a long times experience in construction(more than 10 years) specialised in building construction,refurbishing,extension,painting,carpenter. I own all necessary tools for any kind of jobs . I am a very serious person,with many tipes of skills ,so be free to contact me anytime.

We are a Derbyshire based building company who work to very high standards and expectations all our staff and sub contractors are time served professional people Monument castle has been trading since 2009 and have built up great relationships with trades and suppliers during this time , We undertake all types of building works from extension to new build homes to commercial works

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Reviewed by Andy on 9/9/2012

Extremely happy with work carried out, first class job at the right price, would recommend to family and friends.

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Reviewed by Adnaan on 13/1/2017

Nice clean job at a good price however did not return to complete 1 remaining door even though I paid in full. Disappointed as Joe was a very nice guy.

Just4U Builders We offer a wide range of home improvement and repair services, including: Painting Carpentry Flooring Plastering Plumbing Handyman Services Feel free to let me know if you'd like more details added or if you'd like me to assist with something else!

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Reviewed by Paula on 24/4/2025

We needed a wall to be repaired because there was a crack from top to bottom. Leroy did a great job with the repair and he also did a perfect job of painting the garden walls and the gate. The work was neatly done and looks impressive. Thanks very much.

We are a building company located in manchester, providing all aspects of building services to our clients.

We are small team of professionals in the construction private sector for more than 15 years. Based on our skills we aim to provide top quality various construction works

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Reviewed by Jolanta on 11/4/2025

JND fitters quote for floor laminates was competitively priced and real value for money. They arrived early and finished the work before the deadline. Excellent quality of work, attention to detail and finishing touches. Highly recommended, definitely would hire them again

We are a small company, specialising in supplying quality workmanship, to customers, all our installers have aquiared many years of experience, this includes electrician, carpenters, painters, floor layers , we specialise in garage conversions, and refurbishment work ,

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Reviewed by Lynne on 10/6/2024

Good communication throughout the process. The job was well done. Premises left tidy. Rubbish collection arranged. I would definately use again.

AK Construction SW LTD is an experienced, growing building company based in Taunton, Somerset. We cover all aspects of the building, maintenance and decoration trades and we love to leave a finished job that we can be proud of. We're well known for the quality of our work and attention to detail. As such, our services are sought after from small jobs to larger projects like extensions and refurbishments. We also specialise in bespoke English Larch decking and fencing as well as outdoor offices and garden rooms to transform your outdoor areas and add long lasting kerb appeal to your home. We're available to undertake a diverse range of jobs big and small, from skilled and detailed refurbishments, bathroom remodelling, kitchen installations, carpentry, decorating, plumbing, general building and electrical repairs, to complete renovations, improvements and property extensions. Our small and friendly team of skilled tradesmen take pride in our work and strive to finish each job to a high standard and would love to come and quote for your needs. All work fully insured.

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Reviewed by tim on 18/12/2024

Fred and his team did a brilliant job replacing my bathroom floor and shower. Every effort was made to ensure job was completed to the highest standard and we can’t be happier with the finished product. Would highly recommend AK constructions SW for your building needs.

peter avatar

peter

Cellar & Basement Conversion

A well-trusted joiner, specialising in bathrooms, kitchens, internal and external woodwork. Over 20 years experience completing jobs at the highest standard.

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Reviewed by Irene on 10/4/2024

Superb, a very professional job fitting my skirting boards, I would highly recommend Peter and will do so to my friends and family.

M-2 avatar

M-2

Cellar & Basement Conversion

Hello, we would like to introduce ourselves – we are M-2 Construction, a local construction business based in Ramsgate specialising in home improvement projects. A bit about us... We pride ourselves in providing exceptional building services through quality of workmanship and project management with communication and transparency at the heart of everything we do. We realise you love your home, and we want to help you fall in love with it even more, priding ourselves in working in partnership with you to make your dream a reality.

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Reviewed by Andrea on 17/11/2020

Great Guys, who listened to our requirements and brought them to reality. Clean working and well organised. Will definitely use them again for any building requirements. Thanks

With over 20 years experience in the building industry specialising in extensions , new builds , conversions , and structural alterations we can provide you anything from a small brick wall to a full turnkey project with all certifications We always aim to elevate expectations.

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Reviewed by richard on 3/8/2017

insisted on sealing around conservatory roof with silcone sealant instead of fitting flashing even after repeatedly asking for flashing to be fitted, when roof inevitably leaked would not return to rectify and not returning phone calls/texts

I am a reliable and trustworthy person. I have very been running my company for the last 10 years.

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Reviewed by Paul on 28/6/2024

Found this company on here, asked for a quote, he came out and was very knowledgeable about the work we needed done and gave a competitive price for the work, he had a free slot that worked for us, so he was booked turned up as planned work went to program and was finished on time, did his best to make the mess minimal but it was what it was, pleasure to deal with kept informed and very happy with the result id happily recommend him and his guys, already got future plans for him to do more work for us soon

Welcome to Cerberus Constructions Ltd – Building Excellence, Together At Cerberus Constructions Ltd, we bring visions to life with precision, passion, and a commitment to quality. As a trusted partner in construction and development, we specialize in creating spaces that inspire, endure, and exceed expectations. Why Choose Us? • Expert Craftsmanship: Our skilled team delivers impeccable results, whether it’s residential, commercial, or industrial projects. • Innovative Solutions: We embrace cutting-edge techniques and sustainable practices to shape the future of construction. • Tailored to You: Every project is as unique as our clients. We work closely with you to understand your needs and turn your ideas into reality. • Reliable and Transparent: With on-time delivery and clear pricing, we ensure every project stays on track and within budget. Our Services • New Builds & Extensions: From the ground up, we create homes and businesses designed to impress. • Renovations, Bathrooms & Refurbishments: Transform your existing space with modern, functional, and elegant upgrades, including stunning bathroom makeovers that combine luxury and practicality. • Specialized Projects: Custom construction solutions, including kitchens, plumbing, and boiler installations, delivered with unmatched expertise. Our Promise to You All our projects come with a 5-Year Workmanship Guarantee, ensuring peace of mind and long-lasting results. A Sustainable Future At Cerberus Constructions Ltd, we prioritize environmentally friendly methods and materials to reduce your carbon footprint without compromising on quality. See Our Work Explore our portfolio and see how we’ve transformed spaces across Manchester and beyond. From breathtaking bathroom renovations to stunning home extensions, our gallery showcases the results of our dedication and skill. About Us Founded on a passion for craftsmanship and customer satisfaction, Cerberus Constructions Ltd has been serving the Manchester community with dedication and expertise for over 10 years. Our mission is to build not just structures but lasting relationships with our clients. Your Project. Our Priority. We pride ourselves on transparency, reliability, and exceptional results. From initial consultation to project completion, we keep you informed and involved every step of the way. Let’s Build Something Extraordinary. Contact us today to discuss your project and request a free quote.

WHO WE ARE Viv Construct Group provide a variety of professional groundwork services. We carry out all forms of groundworks construction: underpinning, reinforcing concrete, Driveway Tarmacing, Road Forming, Pavement Tarmacking, Concrete Driveways, Concrete Pavements, Garden Maintenance, Front Patios, Garden Patios, Swimming Pool Slab Laying, Driveway Slab Laying, Drainage, Ducting, Landscaping, Footpath Resin Bound, Drop Kerb and more. What sets us apart is our unwavering commitment to professionalism and efficiency. Our highly skilled team utilises the latest equipment and follows industry best practices to ensure that every project is completed to the highest standards. We prioritise safety at every step, adhering to all regulations and guidelines to create a secure working environment for our team and clients alike. Check out our site https://vivconstruct.com We are one of the leading groundwork Cambridge based and have decades of experience working with the wide variety of buildings that are found in Cambridgeshire. We work with: buildings of different ages, different types of buildings with different forms of construction, and all shapes and sizes, as you would expect in a historical city like Cambridge. We provide a variety of professional services from getting the ground ready for new construction work to repairing and reinforcing existing buildings. We carry out all forms of groundworks construction: underpinning, reinforcing concrete, Driveway Tarmacing, Road Forming, Pavement Tarmacking, Concrete Driveways, Concrete Pavements, Garden Maintenance, Front Patios, Garden Patios, Swimming Pool Slab Laying, Driveway Slab Laying, Drainage, Ducting, Landscaping, Footpath Resin Bound, Drop Kerb and more. We want to give our best at all times so we are assessing our work and looking for any improvements that can be made.

Small family run building company with over 40 years experience over 2 generations as a premium general building company. All types of building work carried out to the highest standard. A one stop shop for all your building needs right from the design and planning stage to completion. Joinery, roofing specialising in flat roofs Building and Plastering A wealth of experience in remodelling and renovations, extensions and sunrooms. Landscaping and paving. All areas covered. Fully insured, trained and certified tradesmen

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Reviewed by Danny on 5/2/2025

The advertised job I have could not get much better because it has been first class.

For over three decades, Millington Construction has been a trusted, family-run business dedicated to turning customer ideas into reality, consistently delivering within budget and on schedule. Whether you envision an extension or require maintenance, our comprehensive expertise in the construction industry ensures all aspects of your project are covered. Comprising a skilled team of 12 professionals, each member brings a wealth of expertise and dedication to every project. Our Services: Extensions: From single-storey to multi-storey extensions, our experienced team of builders skillfully executes diverse projects tailored to meet your specific requirements. Maintenance: Trust us for meticulous maintenance services designed to keep your property in prime condition. Our Approach: At Millington Construction, we firmly believe in the strength of our team. Our highly knowledgeable tradespeople are passionate about transforming customer ideas and dreams into tangible results. They are supported by our design and structural engineering partners, enabling us to confidently undertake projects of any size. Why Choose Us? 1. Pride in Craftsmanship: We take immense pride in our work, ensuring attention to detail in every job we undertake. 2. Driven Workforce: Our team is motivated and committed to delivering excellence, ensuring your project's success. 3. Customer Satisfaction: Your happiness is our priority; we strive to exceed your expectations at every stage of the project. 4. Certified for Security: We prioritize safety and security, ensuring that our work meets certified standards.

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Reviewed by Philip on 31/1/2024

Quick to respond to job request, all work done efficiently and professionally. Have already requested millington construction projects Ltd to return and do another flat roof

We are a construction company which specialises in these types of jobs.We take pride in all jobs done properly.We are fully insured with Direct Line for 2 million.We get great discount from local suppilers.Please call or Email for free advice or quotation

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Reviewed by Alexander on 27/10/2023

Really nice and cleaned up after himself. Reasonable price, would use again

Lambarde is located in the Sidcup area and covers most of the South east, we have a combined experience of 62 years, I started carpentry and building work as soon as I left school then going to college for two years becoming a fully qualified carpenter with Levels 1,2, NVQ Diploma. All of our team carry public liability insurance, so you’re in safe hands. We also work alongside other fully qualified trustworthy tradesman for our refurbishment works. We pride ourselves on: • Workmanship • Time keeping • Honest communication Portfolio on Instagram: Lambarde_ We specialize in: • extensions •.Loft conversions • Kitchens • Internal and external doors • Skirting and architrave • garden room/man caves • wall panelling • Roofs cut/pitched • Decking • Flooring laminate/herringbone • Ironmongery • Cladding • Refurbishments • Painting and decorating Free quote available

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Reviewed by Mark on 7/1/2023

Scott and his team did a fantastic job with our loft conversion. He was approachable, honest and friendly throughout. But most of all an excellent carpenter who did a first rate job with our loft and also dealt with our many requests and amendments with patience and professionalism. I have recommended Scott to friends and neighbours already and would recommend him for any work you are doing.

Full property maintenance Handy man no job to big Painter & decorator Kitchen fitting r Bathroom fitting Tiles fitted Full house refurb HMO conversion

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Reviewed by David on 10/12/2024

Absolutely 1st class response by Harj & his team to some very challenging works. Cannot recommend highly enough for any domestic or commercial projects. Good value, reliable, always polite & goes the extra mile to deliver the highest quality.

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