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Craig got in touch quickly, gave me a rough estimate over the phone and answered all my questions. Surveyor arrived on time, gave instant quote. Price was good. Michael and (another) Craig turned up to do the job on the day, time given. Good, tidy job. Can't fault anything, from start to finish!! Would recommend!

Mary

George and his team are experienced builders, replaced my front door with a custom frame/sidelights and raising the floor level in the hallway quite quickly - in fact, they were the only who came next day, gave a quote straightaway and were ready to start in just couple of days. They also had all the necessary tools and materials, were ready to buy something additional quickly on the day - if further adjustments were required to fit everything as I asked. Thanks a lot for your help, guys!

Dmitry

Highly recommend. These guys did a fantastic job of constructing our pergola and decking. Very hardworking and reliable. The job was completed in the time frame agreed and to a very high standard. We would 100% use them again.

Holly

A basement conversion has the potential to add a lot of value and space to your home. Once your team excavate your new basement, you can turn it into a bedroom with an ensuite bathroom, a new gym, a living room, or any other living space to transform your underground spaces into useable rooms. Find everything you need to know about hiring a local cellar conversion specialist. Below, we cover tips to help you find a basement conversion specialist:

Browse Cellar & Basement Conversion specialists

Take a look at our Cellar & Basement Conversion specialists profiles, read reviews and request quotes directly.

How to find a reliable, local basement conversion specialist

What does a cellar conversion involve?

If you already have a basement, then you might be looking to turn it into a liveable space by adding structural supports, damp-proofing, insulation, heating, and a new ventilation system. If your cellar was intended for storage and has low ceilings, your basement conversion team might have to dig down to increase the head height before they can add things like new plumbing and electrics.

Or, you might be thinking about extending your current basement, such as by digging underneath your garden. This is another great way to add more space and additional rooms to an existing basement.

If you don’t currently have a basement, you can also create a new one by carrying out excavation work. As well as the basement, you’ll also need a new staircase.

Whether you want to build a cellar from scratch or want to turn your cramped storage room into a brand new living space, a basement conversion specialist can help.

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Factors to consider before hiring a basement conversion specialist

On average, a basement conversion can take anywhere from 12 to 20 weeks to complete. Avoid stress and costly repairs down the line by hiring a skilled specialist to help you upgrade your home. Look out for basement conversion installers that:

  1. Are a skilled company with a strong history of high standard projects
  2. Have all the licenses and insurance needed to protect you and their workers
  3. Have a good range of positive reviews from previous customers vouching for their reliability
  4. Are available to carry out the work in the timeframe you need it by
  5. Are quoting a price and payment option that you are happy with, having compared the quote with other basement conversion companies

How much does a basement conversion cost?

If you don’t have space for a rear or side extension, and don’t have a loft to convert, then a basement conversion is a great option to maximise your home’s space. How much you’ll end up spending on your basement conversion depends on a range of factors, including:

  • The size and layout of your basement
  • How many structural changes will be needed, including extra support beams and underpinning
  • Waterproofing and damp proofing costs, as well as the installation of effective drainage systems
  • Whether you want a window well installed, which can help you introduce light into your basement
  • Basement insulation and soundproofing
  • Labour costs, which are affected by where you live in the UK
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The average basement conversion costs between £120,000 and £160,000. For a more accurate quote for your specific project, speak to a basement conversion specialist today.

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Other basement conversion FAQs

Do I need planning permission for a cellar conversion?

You generally do not need planning permission if you are converting an existing basement into a living space without changing the building's external appearance. However, you will likely need approval if you are excavating a brand-new cellar, creating a separate living unit, or working on a listed building.

For more information, contact your local planning authority or visit the Planning Portal website. You can also read our planning permission guide for more information.

What questions should I ask before hiring a basement specialist?

Always ask if they carry public liability insurance, how many years of experience they have, and for a detailed cost breakdown and project timeline. You should also confirm if they use subcontractors, ensuring any gas engineers are Gas Safe registered and electricians are appropriately certified.

What is a sump pump, and do I need one?

A sump pump is a drainage system installed below the basement floor that automatically pumps out any groundwater that collects under the property before it can flood your room. Because cellars are naturally below the water table, a sump pump paired with a waterproofing cavity drain membrane is almost always required to ensure your conversion stays completely dry and structurally safe.

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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 Steve on 9/6/2026

Excellent work. Very helpful and professional in both their approach and carrying out the works. Highly recommend

Welcome to Simple Building Solutions! We are a fully insured company with only the best tradespeople. We specialise in house renovations, completing all work necessary from beginning to end. So you can fully relax during the process and love the end result!

Michael Douglas avatar

Michael Douglas

Cellar & Basement Conversion

If you are looking for driveway ideas or a new driveway, path or patio to compliment your home then RedDragon Driveways&Patios has everything you need, we cover all the major types of drive, pathway or patio that you could ever want which includes Resin, Tarmac, Pattern Imprinted Concrete and the latest style of driveway which is Rubber Compound, the installation companies that complete your driveways are fully insured with at least a 10 year warranty, some offer a 15 year warranty. Whether you are looking driveway ideas for a new driveway, patio, pathway, child’s play area or swimming pool decking area we have you covered, RedDragon Driveways&Patios covers every Welsh county for all the above styles of driveway and more. We have access to highly qualified installers waiting to give you a FREE no obligation quotation and transform your property and take it to the next level. Once the driveway or patio etc has been installed your properties kerb appeal and value will increase, if you are looking to sell you can bet prospective buyers will prefer a home that has a modern driveway to one that does not

Design and Build services offered from inception to key turn completion. Full CAD drawing and building regulation design services by qualified Architect. Prices broken down to allow project costing and value engineering if required to suit your budget. Fixed price quotations and or estimated costs. DND ltd are a highly respected company offering quality workmanship at reasonable rates

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Reviewed by David on 18/5/2020

David, Adam and the team they employed were very good. They talked through every aspect of the job beforehand and made the costs clear in the contract. The construction was of a high quality and all done efficiently. This construction was completed during lockdown and the team adapted and communicated well throughout the process. Everyone who worked on the job was polite and friendly and professional. During the construction there were minor changes needed which were accomodated well, even after completion.

Dear Customer, We are a construction company with over 25 years experience. We undertake all aspects of building work, including new builds, extensions, lofts, total renovations, new bathroom and kitchens. All work guaranteed and certified for, GasSafe and NiCEiC approved on completion.

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Reviewed by John on 28/1/2026

We got Kingston Surrey Construction in to undertake a full ensuite refurbishment after too many leaks and drips over the years. They provided a competitive quote and were available to undertake the work quickly to suit our needs. They worked at a steady pace with a focus on doing it right rather than doing it quickly. Their communication was good and they were as tidy as you can be with such a job. Overall we are very pleased with the outcome of the work, many thanks.

Check out our face book page toplinesprayers uk !!!!

Titan C&D Ltd are a family run business offering a range of construction activity to suit the homeowner. We are specialist in resurfacing and paving with over 10 years experience working on domestic and commercial installations. look for us on facebook

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Reviewed by Jonathan on 9/10/2017

Titan did an excellent job building a raised bed in our back garden using sleepers.

Hello we are Renovate North East and we are your local professional builder with a fantastic reputation for outstanding work at an affordable price. Our team is dedicated to making your job a reality.

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ASPRAY WIRRAL

Cellar & Basement Conversion

Do you need to make a claim on your insurance for damage to your property? Our award-winning claims management service aims to help policyholders throughout the UK make successful buildings insurance claims caused by storms, burst pipes, accidental damage, fire, floods or other events which lead to the property owner needing to make an insurance claim. We also project manage the repairs to the damage and always strive to reinstate the property to its pre-loss condition as swiftly as possible. Most importantly, there is NO CHARGE to you, the policyholder and property owner for the Aspray service provided we can instruct and oversee the vetted contractors who will complete the reinstatement works. However, any excess stated within the policy will of course still apply.

Warner Builders are a family firm that have been offering Building services for three generation's. Based in North Broxtowe but cater for the whole of the East Midlands. We cover all aspects of Building. Brickwork Specialists, a clean and reliable service

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Reviewed by Hannah on 3/7/2020

Great work on boundary wall and did a lot of work for the money including removing a larger than expected tree. Would highly recommend.

SGH Construction & Groundwork have been established since 2016 we are a family run business that has been operating via customer recommendations. We pride ourselves on safely delivering the highest quality work for our clients. All of our staff are fully qualified for the job in hand. Please feel free to give us a try.

I am a multipurpose builder/handyman that can complete most jobs around the house 22G Construction is a well established Multi-trade company that has built up an enviable reputation over 10 years. I am diligent, pay attention to detail and complete work to a high standard. I provide solutions based ideas and am very approachable. I have an excellent knowledge on Electrics and Plumbing. I also install CCTV systems. I repair/ install new fixtures and fittings that includes Flat Pack Furniture assembly, Blind installation, TV installation to mention a few. Plus much more Instagram@22gconstruction Facebook@

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Reviewed by Lee on 26/10/2020

Great team and work. All work was completed with each phase being completed as described. Clean, tidy and professional keeping disturbance to the neighbours down to the minimum. Will be using these guys again for my next project.

Unico avatar

Unico

Cellar & Basement Conversion

Whether for commercial or domestic projects, we provide a friendly and professional service that includes all aspects of design, planning, construction, building repair and maintenance. With extensive experience in the construction industry, our team of fully qualified tradesmen guarantees a high standard of workmanship. We are completely committed to every project we undertake and all are properly managed to keep writhing budget and in schedule. We are punctual, reliable, tidy and and the good relationships we build with customers means a high level of repeat business and recommendations. Facebook & Instagram unico develop

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Reviewed by Paul on 3/11/2022

Too Inexperienced

Total property maintenance. External painting and interior painting. Paper hanging. Laminate flooring tiling and joinery

Established in 2021, Pure Construction Group Limited has rapidly built a reputation as a trusted multi-trade building contractor, serving the commercial, social, and domestic markets across Northwest England. With over 30 years of combined commercial and subcontract experience, our team has driven the steady growth of our business. We pride ourselves on being large enough to handle significant projects but small enough to provide personalised attention and exceptional service to every client. At Pure Construction Group, we offer a comprehensive range of services to meet diverse needs. Our offerings include everything from strip outs and kitchen & bathroom replacements to internal and external redecoration. We also specialise in disabled adaptations, retrofit work, structural repairs, groundworks, extensions & alterations, minor building works, roofing (both pitched and flat), damp proofing, and cleaning. Our broad service scope reflects our commitment to delivering high-quality solutions tailored to each project’s requirements.

I am Grigore Marian Morar, I am serious when it comes to a task or a job and at the same time to be on time.I mostly like to paint and i am really cautious of every little detail and the same with joinery, tiling and everything links to house maintanance. If you need help from a serious, skillful and perfectionist, call me!

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Reviewed by Gloria on 16/12/2018

Grigore was very good with the task at hand. He was punctual and reliable.i have discuss other jobs with him.

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Areen Shekhani

Cellar & Basement Conversion

I’ve been in the building trade for over 20 years and would like to think I’ve gained knowledge and experience in most aspects of domestic building i always like a challenge and try to make people’s concepts a reality I will always try my best to give a fair price and always adhere to time scales my main background is general building work .but I have a host of sub contractors working with me so we can take on more or less Any work you may require

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Reviewed by Michael on 24/8/2026

Hi iam Mariusz Builder/Multiskils I experience 34years on Building site my specialities is Tiling/Bathroom/Fiting Bathroom staff.Kitchen tiles etc.Kitchen Fitting. Plumbing. Electric. Extension loft conversion.Carpentry. Wooden Floor Vinyl etc. Brick work/Pointing. Plastering/skimming. Decoration/Painting and more more task thanks Mariusz ML Contractors

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Reviewed by mark on 24/12/2025

Mariusz, (ML contractors), is an exceptional artisan. We needed repairs to a kitchen work surface and replacement of the mixer tap for our rental flat. See photo, he replaced a section of the work surface and fitted this and made good the repairs. So we also got him to decorate 2 rooms again the work was brilliant, efficient and reasonably priced. Can't recommend highly enough!! We will definitely use his skills again.

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