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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.

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General Builder 19yrs in the trade Highly skilled - standard to high end jobs

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Reviewed by tom on 20/3/2025

Good job and good knowledge of the issues at hand. Competitive on price. Good communication during and after job.

27 years experience a company you can trust,leave nothing to detail.

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Reviewed by Robert on 4/8/2023

Steve replaced our guttering, downpipes and a bargeboard. It wasn’t a straightforward task as it’s an old property but he did an excellent job and carried out the work quickly and efficiently at a competitive price. I would highly recommend him.

Hi, we are a group of 3 hard working people who are experienced in gardening and landscaping jobs for more than 5 working years.

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Reviewed by Natasha on 20/4/2025

NICEIC approved and fully insured electrical contractors covering all of London. Welcome to the world of Bennet Baldwin Ltd. We are the premium choice in emergency electrical work, offering our expertise and service to keep your home and business safe. Our team of professional and reliable contractors are available 24/7 to attend to all kinds of emergency electrical repairs and issues. Whether it’s fixing a faulty circuit or replacing your old fuse board, you can count on us to deliver the highest quality work at competitive prices. With the best materials, a comprehensive guarantee and full customer satisfaction, you can rest assured that you will get the perfect solution for your electrical needs. We understand that emergencies can occur anytime and we take pride in offering a fast and efficient response to ensure your safety and comfort. Our experienced electricians know exactly what needs to be done and are always prepared for any challenge. With the latest technology and top of the line safety equipment, no job is too big or small for us. At Bennet Baldwin Ltd, we strive to provide excellent customer service and value for money. With a free quote and free consultation service, you can be sure that you will get the best solution for your electrical requirements. Make the right choice with Bennet Baldwin Ltd . Put your mind at ease and get in touch with us today!

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Reviewed by Shilpa on 22/4/2024

Quotes shared timely, good communication and excellent work done in under a week. Will certainly use their services again if needed. Recommended.

Over 30 years experience in all joinery, paintings and building.

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Reviewed by IAN on 13/4/2025

Professional in his approach. Worked well. Very pleased with the work he did. I would recommend him to others.

Quebuild London Ltd offers a full building service with every aspect of works covered no matter the scale or scope of works to both residential and commercial buildings.We also provide proactive and reactive maintenance packages with 24/7 one hour service for emergency call outs.We pride ourselves on using only highly skilled and courteous tradesmen with all trades in house so as a company we have full control of our projects. From your initial meeting with one of our knowledgeable estimators who provide fixed price detailed estimates to completion of works overseen by amazing management our clients needs are paramount,this ensures a streamlined service with quality controlled finishes beyond the industry standard. We have full public liability insurance with all risk assessments and method statements in place at all times no matter the size of works for peace of mind for us as a company but more importantly you as our client.

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Reviewed by Tom on 3/8/2024

John at Quebuild went above and beyond for us on this job. He completed all the work in a timely manner and for a very reasonable price. He was super knowledgeable and extremely attentive to detail, making sure to leave a high quality finish in terms of decoration - and he came back afterwards to address a few small things that needed doing. He was also a pleasure to have around - and I would highly recommend him for any other work. 10/10.

At ICON_Interiors , we are a family-oriented construction business with over 15 years of experience delivering high-quality building services. From kitchen and bathroom installations to full house renovations, loft conversions, and restaurant refurbishments, we pride ourselves on being able to take on projects of all sizes—no job is too big or too small. Our team brings a vast knowledge of various trades, allowing us to handle all aspects of construction with confidence and skill. We also collaborate with a trusted network of specialist tradespeople to ensure every project is completed to the highest standards. Whether you're planning a small renovation, a major extension, or any construction work in between, we are committed to delivering exceptional results. With numerous satisfied clients, glowing references, and a portfolio of completed projects, we are confident that we can bring your vision to life. Contact us today to discuss how we can help with your next project!

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Reviewed by Paul on 30/12/2024

Sam did a really good job fitting the door, especially considering we have an old Victorian house where there isn't a straight wall or door opening in the whole house.

At QSBS LTD, our name stands as a testament to our commitment to excellence and precision in the construction industry. Quality Spec Building Service encapsulates the core principles that drive our co mpany. QSBS Ltd is dedicated to transforming visions into reality. We understand that property design and construction is not just about creating physical spaces but about crafting environments where memories are made and moments are celebrated. Our mission is to breathe life into designs and functionality, providing spaces that are both beautiful and practical.

At Right Fix Home Developments you can rest assured as we provide the highest of standards. We have over 10 years experience working with contractors on building sites and direct to customers for all aspects of home improvements. "NO JOB TO BIG OR SMALL"

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Reviewed by Darren on 9/4/2025

Had a quote of Gareth to replace my polycarb roof with tiled.Out of three quotes his was the most fair,had some shockers !!But no drop in quality,did a great job and completed in just 3 days.But what impressed me the most is how honest and genuine he is I am sure that if I have any issues in future he will be happy to help sort it.Nice and clean after completion also.Recommended.

Meadow Cut avatar

Meadow Cut

Cellar & Basement Conversion

Hi my name is Eddie I’m a qualified carpenter that has done a lot of general building I have been doing this for about 20 years now I work alongside some very good tradesmen and I really enjoy this line of work . We In joy what we do We love to see the finished product and a happy customer?? (I like my tea white with one sugar)

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Reviewed by Beverley on 15/4/2025

They did a really good job at a very good price. Very friendly people.

All aspects of electrical work undertaken fully qualified professional service with 20 years experience.

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Reviewed by Caroline on 20/12/2024

Really quick to respond, turned up as planned & the work carried out was excellent

We aim to be a world class Construction Company providing efficient affordable, sustainable, cost effective services of highest level of quality. We undertake all projects, big or small and specialise in major renovations including; Extensions – Loft Conversions – Restoration & Alterations Garage Conversions – Landscaping & Patios – General Building Work Renovating a property can bring a new lease of life to your home with the feeling that you live somewhere new without having moved. Whether it's a major remodel by knocking down walls and building new ones to change the entire look of your home, to simple and subtle updates and upgrades like new floors, new doors, a modern new kitchen or a stunning bathroom, using modern materials we can help you create your ideal living space.

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Reviewed by Alvaro on 8/3/2025

Dragos was very efficient, reliable and flexible, 100% would recommend

22 YEARS EXPERIENCE ON BUILDING and construction. With my team we did from Garden Landscape all the way to new build yet making sure Clinet saves as much as possible on they projects cost . We are qualified Gas safety Electrical Plumbing We specialaise on: Loft conversion Bathroom Kitchen Extensions Paiting and Decorating Plumbing Roofing Garden Landscaping Insured and insurance backed services

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Reviewed by Margaret on 14/2/2025

Prompt efficient service. Left area clean after work completed.

Nu Space avatar

Nu Space

Cellar & Basement Conversion

Whether you're in need of a renovation, facing an emergency leak, requiring asbestos removal, or seeking efficient waste management services, we've got all your needs covered. Look no further for comprehensive property solutions at competitive rates. As proud members of the Federation of Master Builders, our skilled and experienced team possesses the necessary expertise to tackle any project. With a robust track record of successfully completing a variety of jobs in both commercial and residential settings, our team is fully equipped to handle projects of any size and complexity. Your satisfaction is our top priority, and we are committed to delivering optimal results for you. Choose Nu Space for a seamless, reliable, and expert approach to meet your requirements.

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Reviewed by Sarah on 31/3/2025

TCL Building and Landscapes, friendly professional service.

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Reviewed by Paul on 8/3/2024

Quick response and turn around

Iqbal Construction is a building company based in Birmingham with over 10 years of experience in the Construction industry, We carry out all aspects of Domestic/Commercial building works across the West Midlands to the highest standards. Services include plumbing, carpentry, brickwork, loft conversions, extensions, house renovations, painting/decorating, plastering and all other general building works.

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Reviewed by Lewis on 26/8/2024

Very pleasant guy, responded quickly and worked really fast. Explained what he had done and why. No mess or messing about. Likely to get more work from us in future.

Alliance building and landscapes Ltd are a family run business here at alliance we make sure all works is completed to customer satisfaction,no job to big or to small,contact us today for a free quote,book once,book right,book alliance

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Reviewed by Raymond on 28/2/2025

Thanks to Michael and the team for a great job rendering the chimney breast in the attic. Quoted and works completed in less than 48hrs. Not the cheapest of the quotes I received, but went with the positive reviews and wasn't disappointed.

Over 30 years of experience as a multi-tradesman. As well as being a qualified plumber I specialise in other wet trades e.g Decorating, Plastering & Rendering, Tiling & Bricklaying. Also, I fit laminate flooring, skirtings, architraves and timber stud work. I am always punctual and reliable, and clean and tidy in my work. I am also happy to assist in planning and designing projects.

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Reviewed by Amanda on 19/4/2025

Kevin arrived on time, did an amazing job on my mother’s bungalow, cleaned up afterwards. Polite, friendly and professional. Good price too.

I am based out of Gloucester, but willing to travel to surrounding cities. I am extremely confident in my skill set. When it comes this trade, nothing beats the experience I have.

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Reviewed by Janice on 27/3/2025

Decided not to proceed as the cost seemed excessive.

Adam Asher avatar

Adam Asher

Cellar & Basement Conversion

Welcome!   We love gardens and the beauty they bring to your surroundings, however, gardens require work which we understand you may not have the time to invest.  This is where we can help.   Our family run business offers reliable, friendly and affordable garden services which will make the most of your garden and outdoor space.  We carry out the work enabling you to simply enjoy the pleasure of a well maintained garden. What we offer Whether your garden is small or large, simply needs mowing or a complete overhaul, we can assist to ensure you get the most from your garden.  Here are just some of the services we offer: Clearing overgrown gardens, tidying, managing shrubs   One off garden clearance Regular maintenance Lawn care Flowerbeds,  Containers & Baskets Hedge Care Decorative Coverings Wood protection Fencing Patio & Drive Maintenance Overall care for your garden including planting, pruning, weeding and mowing   Regular mowing, aerating, feeding and scarifying to maintain and improve your lawn   Creating raised beds, digging new borders and care for existing flowerbeds including planting, weeding and pruning    Trimming, reducing or planting new hedges   We can provide and install gravel, slate, bark or pebble to compliment or transform the look of your garden   Care for fencing, decking, sheds and other wooden garden features to enhance their look and provide weather protection   We repair and install new fences, or can simply replace panels or posts to your requirements   Pressure washing and weeding to maintain a quality appearance

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Reviewed by Roy on 15/3/2025

Excellent service. Adam was very professional, good and collected, cleaned, and removed all cuttings. Will recommend him to anyone needing a gardener.

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