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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

Thank you for reading our profile. We have over 20 years experience in all aspects of Roofing, from small repairs to a full new roof. We really do care about all our customers and take pride in our work . We are hard working, punctual and honest.

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Reviewed by Amy on 3/4/2025

midland improvements has over 35 years in the home improvement market from a kitchen to a bathroom from a garage conversion to a full renovation whatever your home improvement needs we have the experience and trades to complete the job ,

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Reviewed by Paul on 18/3/2020

Garage conversion into living accommodation, en-suite, and retained small section for storage accessible from both outside and inside. Great work that's stood up to almost 4 years of solid regular use so far.

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.

Martons Building Contractors is a trusted name in construction, known for our problem-solving skills, attention to detail, and innovative designs. Our mission is simple: to exceed the expectations of every client we serve. We offer a range of services including conversions, extensions, groundworks, new builds, and roofing. With a combined experience of over 100 years, our team of 5-6 professionals ensures that every project is executed with precision. While our core team is small, we have a network of reliable subcontractors for electrical and plumbing work. Based in Leeds, North Yorkshire, and Lancaster, we are dedicated to serving these areas with quality construction services. Choose Martons Building Contractors for reliable craftsmanship and a commitment to excellence in every project. All contracting works available and covered in and around Yorkshire.

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

We are a friendly family run business of 3 generation's We offer a complete building service with all of our trades men in house. we have completed some major restorations such as Vermont hotel 108 bathrooms county hotel full conversion many extensions and house builds also maintenance for landlords and home owners give us a try and hope to see you soon.

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Reviewed by Alan on 2/5/2025

Excellent. Did the work with no bother. Good price.

We are a reliable, friendly company specialising in home improvements and property maintenance. Fully insured, we are committed to providing an excellent service to our customers. Our services include; General property maintenance Painting & Decorating Driveways Fencing Landscaping Mowing and Hedge cutting services And more.. We look forward to hearing from you to discuss your requirements. Contact us today for a free, no obligation quote!

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Reviewed by Danny on 11/6/2025

Great work. Delivered the brief in the timeframe and on budget. Left them to get on with it and they sorted the whole thing without any hassle.

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.

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.

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.

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Q Cama

Cellar & Basement Conversion

Hi, I do high quality Carpantery work. -Fitting doors -kitchen fitting -wooden floor installation as well as sanding and varnashing -Fitting sash windows

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Reviewed by andrew on 2/7/2012

Qamil He constructed our loft conversion, which we more than happy with. He paid attention to detail and followed the drawings by the architect precisely.He was always willing to discuss any issues and communicate his next plans for the ongoing work. As he was hardworking and punctual the work was done to programme. Would highly recommend him and all the sub-contractors that he has used. Tracey and Andy Sparks

NO UPFRONT PAYMENTS 0R DEPOSITS REQUIRED FREE QUOTATIONS. Luxury Spaces specializes in joinery, plumbing, and electrical services,l honed over 22 years to meet exceptionally high standards. Our commitment is to transparency and integrity in every project, collaborating closely with clients to achieve optimal results within their budget. We offer no-fuss financing options—simply reach out for guidance. Services' provided are as follows, Kitchen, bathrooms, bespoke staircase's, extensions, windows. As a family-operated business spanning generations, we take pride in passing down expertise from father to sons. Our dedication to excellence extends from military training—an artillery Gunner for five years—to every task we undertake. With honesty at our core, we consistently deliver value for money. Our clientele, diverse yet united in their desire for quality workmanship, inspire us to exceed expectations. To honor service professionals, Blue Light cardholders, and pensioners, we extend special discounts as a token of appreciation. For further details, visit our website: lux-spaces co,uk,

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Reviewed by Sheila on 25/6/2025

Aaran's work was first class. He installed wall panels, new vanity unit and wc unit. He went above and beyond what the job was supposed to be going a far as picking me up and taking me to select the goods needed to complete the job as I don't drive. Can''t recommend him enough. Don't even think about another plumber - you won't be disappointed!

Property Solutions Ltd Every Roofing Solution At Property Solutions Ltd, we are dedicated to delivering superior roofing solutions. With our wealth of experience, we have become the go-to roofing company for both residential and commercial clients. Our team of skilled professionals takes pride in their craftsmanship, ensuring that every project is completed with precision and attention to detail. From minor repairs to complete roof installations, we use only the highest quality materials to guarantee long-lasting results. Customer satisfaction is at the heart of our business. We strive to provide excellent service, transparent communication, and fair pricing, building strong and trusting relationships with our clients. When you choose Property Solutions Ltd, you can rest assured that your property is in safe hands. Let us protect your investment with reliable and top-notch roofing solutions. Contact us today for all your roofing needs!

hi my names Chris. I am a very handy person with things that needs doing around the house. and I charge very fair prices. We cover most areas from roofing, gardening, plastering, some plumbing, painting, almost anything you need do we have you covered so get intouch for a free quote

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Reviewed by James on 21/2/2025

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

At TrueLine Finishes Ltd, we’ve built a reputation over the past 16 years for delivering top-quality finishes across a wide range of projects. Whether it’s home improvements, full refurbishments, or large-scale extensions, we handle it all with precision and care. We pride ourselves on not only the quality of our workmanship but also our reliability and the strong, lasting relationships we build with every client. If you're looking for a trusted partner who delivers excellent results on time and within budget, TrueLine Finishes Ltd is the right choice for your project.

30+ 5 Star Reviews on Google!! New to rated people Ashco Contracts Ltd is a family run building contractor serving the Essex and surrounding areas. The company is run by twin brothers Callum & Ash, who took the business over from family in 2015. Since then the business has has come along way and many hours have been spent on site and in the office to get the business where it stands today, which they are extremely proud of. A combined total of over 25 years in the construction industry, Ashco prides itself on repeat business and reputation. Weather it be a small repair job or a large extension you are in safe and secure hands with Callum & Ash.

Linked builders Ltd is a family run buisness, we take great pride in our work. Our work team have experiance of over 20 years in the building trade; giving you great advice and workmanship. Please take a look at our profile! Many Thanks

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Reviewed by Bob on 30/4/2025

Avoid these people at all costs, after charging me a ridiculous amount of money to carry out the job he scrimped and saved on everything doing a appalling job and now refuses to rectify his errors and to finish the job. Do NOT have anything to do with them.

Quality of work and customer satisfaction are key concepts that we do our utmost to ensure. We carry out the majority of building works ourselves and do not subcontract unless absolutely necessary. Having spent many years in the construction industry, we are experienced builders. We install all types of flooring, including Engineered Oak, LVT, Karndean and laminate flooring. We also install kitchens, fitted bedrooms and just about everything carpentry.

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Reviewed by Gerens on 30/7/2025

Andy was excellent. We had a difficult job for him, and we had an upfront chat about expectations. Andy is clearly a perfectionist, and he worked hard for three days to deliver a very high quality job in difficult conditions! Would recommend him highly for any job.

the owner of j and I roofing . I have been in the roofing trade since learning of my grandfather as a young boy first climbing ladders I am a dedicated precise and trustworthy tradesmen with a group of five men working for me all polite with a great work ethic. I started my company back in 2015 and have been persistent with my jobs with customer satisfaction always kept at a high standard.

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Reviewed by Martin on 28/12/2024

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