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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

Five Star Construction is a family run business with the aim to provide affordable handyman and development works. We are full insured and all our operatives are fully trained for the work we carry out. Our friendly team are awaiting your call

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Reviewed by Thomas on 30/4/2024

Good value Very profession Quick and tidy workman Would definitely use them again. Regards Thomas

At Touchstone (Surrey) Ltd, we are a trusted and established building company backed by over 20 years of industry experience. Formed in 2019, our team is made up of highly skilled tradesmen who take pride in delivering top-quality workmanship across every project, big or small. We are proud members of the Federation of Master Builders (FMB), a mark of excellence that reflects our commitment to high standards, reliability, and customer satisfaction. Whether you're planning a home renovation, extension, or a new patio, we offer fair, transparent, and competitive pricing—with no compromise on quality. Why Choose Us? - 20+ years of hands-on experience - Fully qualified and trusted professionals - FMB-accredited for your peace of mind - Reliable, clean, and respectful service - Honest quotes and competitive rates - Projects delivered on time and on budget We understand how important your home is, which is why we treat every job with care, attention to detail, and professionalism. Your vision is our priority. Get in touch today for a free quote or friendly advice—we're here to help bring your ideas to life.

Our History & Philosophy Our strength comes from our ability to adapt quickly to our customers needs and the competitive marketplace. Established since 2010 We take great care in building strong relationships, not only with our clients, but with our subcontractors, suppliers and the local community to ensure all works are carried out safely. We pride ourselves on our ability to protect the environment and ensure the health, safety and well-being of our workforce, clients and members of the public during construction work. We have grown from strength to strength, now employing over 30 members of staff. We invest heavily in our staff as we believe they are the key to our success and continued growth.

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Reviewed by Robert on 5/5/2021

Kitchen turned out great and Victor was really helpful. Many thanks Guys.

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

Roofing and building professionals in Edinburgh At Premier Roofing and Building we provide services to domestic and commercial customers for all roofing and building projects. With over 20 years' experience, we guarantee quality workmanship and excellent service on all our work. All roofing, chimney repairs and building estimates are provided with a photographic report providing you with clear and concise details of work we will do.

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Reviewed by Simone on 7/3/2025

We are a family run building company, we cover a wide range of works from joinery , building, landscaping and maintenance, We have over 20 years experience and pride ourselves on our professional ability to adapt to each of are customers needs Thank you ,,and hope to help you with your job whatever the size big or small

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Reviewed by Diego on 2/10/2024

Excellent work!

FRPM LTD avatar

FRPM LTD

Cellar & Basement Conversion

Hello we are FRPM Ltd a compete property maintenance company with over 20 years experience so if it’s a leaking tap to a complete property renovation we are here to help so please do not hesitate to call for your free quote Areas we cover Worcestershire Gloucestershire Warwickshire And the Cotswolds We have years of experience working with listed buildings and pride ourselves and our level of knowledge and expertise in this area We also cover light commercial premises for maintenance contracts and adhoc works We are fully insured

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Reviewed by Juliet on 3/9/2025

DO NOT USE THIS PLUMBER! Andy MacClay trading as FRPM was engaged to fit a bathroom for a lady in her 90's. Although personable, he did an appalling job and left the poor lady with raw sewage leaking and a dreadful smell. She was very distressed for months and it cost over £1800 to put the work right. He has since stopped answering his phone and does not respond to any communication.

I’ve worked in the construction industry since I was 16. Doing complete property refurbs right back to the bare shell to complete the project. Went to college when I was 27 and served my time with Rothwells plumbing services where I learned all aspects of plumbing and heating installations. I’ve worked for various social housing providers installing wet rooms bathrooms, heating systems kitchen tiling, and many other tasks. More recently I've been providing maintenance services to landlords and schools . I’ll

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Reviewed by Gary on 17/9/2025

Work is great 90% just have a few small issues Doesn’t return calls planned to come and look at the issues at first Never returns or calls back or message

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Reviewed by Dan on 22/7/2025

Excellent time served Plasterer with 16 years building experience all over the UK .No job to small and always to highest standard possible. Experienced with:Skimming,Boarding,Damp proofing, wall removal (Steel work), extensions, Rendering, roofing, tiling, bathroom fitting Coving,brickwork , joinery. All work is guaranteed . Give us a call for your free quotation

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Reviewed by Michael on 3/3/2025

Brilliant job! Shaun and his team were very punctual arriving early doors and worked non-stop. Did everything we asked for to a very high standard nothing was a bother. Lovely group of lads who we'd highly recommend! Thank you!

Handyman Services, Loft Boarding, Loft Storage Solutions, Full Renovations, Custom Made Furniture and solutions for your house. Years of experience in construction, with background from new build.sites, loft conversions, refurbs, letting agent services, landlord services, ... Please, give us a call and lets discuss the details and availability - when, which day(s) we can get the job done. Looking forward to hear from you. Thank you Rad

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Reviewed by Ray on 8/7/2024

5 star. Excellent professional work

Keen Resources: Elevating Your Spaces for Years to Come Welcome to Keen Resources, your trusted partner in building and property maintenance solutions. Established in 2014 and proudly located in the vibrant North West London area, we are your go-to team for all your construction needs. At Keen Resources, we bring a wealth of experience to the table, with a family-run business that boasts a remarkable 25-year track record. We specialise in providing a wide range of services to Residential, Commercial, and Estate Agent clients, ensuring that every project is executed with the utmost precision and professionalism. Our dedicated team of experts covers a diverse spectrum of services, including: General Building: From the ground up, we craft solid foundations for your dreams to take shape. Roofing: Our experts ensure your property is protected from the elements with top-notch roofing solutions. Electrics: Safe and reliable electrical services to keep your property powered efficiently. Kitchen and Bathroom: Transforming these essential spaces into stunning, functional areas you'll love. Refurbishments: Breathing new life into tired spaces, making them vibrant and appealing. Plumbing: Efficient plumbing services to keep your property's water systems in excellent condition. Carpentry: Craftsmanship that adds character and functionality to your interiors. Tiling: Precision tiling work to enhance the aesthetics of your property. Painting and Decorating: Creating inviting and visually pleasing environments. Handymen (Multi-Skilled): Versatile experts ready to tackle any project with skill and efficiency. At Keen Resources, we are not just builders; we are partners in bringing your vision to life. We take immense pride in our commitment to delivering superior quality, meeting deadlines, and exceeding your expectations. Customer satisfaction is at the heart of everything we do. We believe that every project, big or small, deserves the same level of care and attention. With Keen Resources, you can trust that your project is in capable hands, and the end result will be nothing short of exceptional. Experience the difference with Keen Resources, where excellence in construction meets a passion for customer satisfaction. Contact us today and let's embark on a journey to turn your property dreams into reality.

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Reviewed by Helena on 8/11/2025

After a very log and unnecessarily complicated and long process to get any accurate information from, and when an appointment was finally scheduled - no one showed up, no one replied to messages and calls. Utterly unprofessional, using random contractors, and clearly down to luck - if any of the other reviews are even real.

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.

London Development uk ltd is our company, we have been trading for over 12 years in the construction business. - We are a fully insured company with a big portfolio of jobs completed and we are friendly and reliable on any work and business that is coming across. - We can do big jobs as new buildings or full refurbishments, basements, extensions, lofts conversions etc and also we can do small jobs as bathroom refurbishments or even smaller is always space and time for a new job. - We guarantee you that you will get the best workmanship on your job with best skills and acknowledge in the construction industry, time effective and costly effective for customers. Try our company and you will gain the benefits!!!

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Reviewed by Rita on 25/12/2023

Peter contacted me and was amazing, professional with his quote and recommendation. Very clean, tidy service and very open and honest. Peter and his team are excellent builders.

Welcome to Property Renovation and Decorating Services: " PROFESSIONAL SERVICE " We are professionals builders with over 17 years experience on all building works: extension loft conversion refurbishment bathrooms kitchens painting and decorating plastering, wood flooring, carpet fitting, tiling. building works undertaken: General Building, New Builds, full Interior & Exterior, renovations and much more. Emy has been providing professional home renovation services for over 17 years. He is praised by the customers for his attention to detail, responsiveness, timeliness and quality work. Call (text) for a free consultation and estimate:

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Reviewed by David on 19/11/2025

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Reviewed by Dan on 13/5/2025

Quick and professional

LGL BUILDING SERVICES I have been in the industry for nearly 16 years and specialise in a number of trades including extension,loft conversion, rifurbishmant ,carpentry , landscaping With great attention to detail I aim to provide the highest quality of work. I am a trustworthy and genuine person devoted to my buisness, carrying out work professionally to each individual requirement

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Reviewed by Liz on 28/2/2023

started business as parternership in 2007, we grown our portfolio from 2 houses to 86 units today, we also helped over 100 homeowners and 25 landlords including housing association, we help from a full consultancy package to build yur dreams to even help with leasing to our corporate contacts if you wish to invest. featured on HOMES UNDER THE HAMMER, we pride our selves in job well done, we always make sure we start projects within 2 to 3 weeks from time we agree and we always deliver our projects on time; we make the impossible a luxury and affordable possible while we take all the stress away; BGH combines technical expertise with exceptional customer service, ensuring every client benefits from cutting-edge technologies tailored to their home needs. with industry leading certifications and proven track record, BGH is a top choice for those seeking efficient, reliable and successful renovations We ate fully accredited Offer full guarantees and insurances including insurance backed guarantee and deposit guarantee We are specialist in new build, extensions, heavy refurbs, hmo and luxury conversions

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Reviewed by marvelous on 25/9/2025

Taylors Building Contractors is your go-to solution for comprehensive property maintenance services. From routine upkeep to emergency repairs, here to ensure your space remains in optimal condition. With a focus on quality, reliability, and customer satisfaction, we take the hassle out of property care.we cover all traditional trades to plastering, carpentry, plumbing, and general building maintenance. Roofing, Brickwork,Fully insured, Credit & Debit cards excepted.

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Reviewed by Richard on 13/11/2024

Steve and team did a fantastic job, fixing a few issues in the house for my tenant. Really good service and communication, and will ask him to do jobs in the future.

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

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Reviewed by Mahmud on 13/11/2025

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