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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.

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SOUTH CRAFT LTD avatar

SOUTH CRAFT LTD

Cellar & Basement Conversion

South Craft LTD is primarily a carpentry business, also undertaking external work such as landscaping. Attention to detail and customer satisfaction is the absolute priority at South Craft. A happy client is a returning client. Some of the services we provide are as follows - Media walls - Panel accent walls - Decking - Fencing - Pergolas/gazebos - Outhouses - Landscaping - Cladding - Flooring - Doors - Made to measure storage And much more.

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.

Welcome to AdvancedWall2Wall, where expertise converges with excellence in house extensions, renovations, and all-encompassing building solutions. As a family-run business with an illustrious legacy of over 30 years in the plumbing and heating industry and a robust background in the building trade, we take pride in transforming your vision into reality. Specializing in house extensions, AdvancedWall2Wall offers a spectrum of services covering every facet of your project, from initial groundwork to the final finishing touches. Our team comprises adept professionals, including experienced gas engineers, bricklayers, and plasterers, all proficient in navigating the complexities of home extensions. From conceptualization to execution, we bring a wealth of knowledge and hands-on experience, ensuring your dream space is realized with precision and care. Our dedicated team of 8-10 professionals is passionate about delivering top-notch craftsmanship in all aspects of building work. Recognizing the importance of a reliable and skilled workforce, we invest in continuous training and development to stay at the forefront of the industry. Whether it's creating a seamless blend of functionality and aesthetics or addressing specific needs within renovations, we bring a wealth of expertise to elevate your project to new heights. At AdvancedWall2Wall, we are a fully insured limited company, placing the safety and security of our clients at the forefront. Our commitment to excellence extends beyond craftsmanship to offer you the peace of mind that comes with working with a reputable and reliable partner. Trust us to breathe life into your ideas, with an unwavering dedication to quality, integrity, and customer satisfaction that sets AdvancedWall2Wall apart in the building industry. Your vision, our expertise – together, we build dreams.

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Reviewed by Arwen on 1/4/2025

Would highly recommend Wayne. Quick response to my advert, came out to look at the job quickly and arrived early, gave me the best quote and has done the job when he said he would and to a great standard. Really helpful and friendly, wouldn’t hesitate to use him again for future jobs.

25 years carrying out an array of handyman/maintenance work, relaxed manner with care and attention to each job. Proactive communicator.

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Reviewed by Aggie on 16/12/2025

Great communication and excellent worksmanship. Highly recommended!

Rose Projects avatar

Rose Projects

Cellar & Basement Conversion

A Construction Company based in South West London. Craftsmanship is our main focus ensuring every detail is finished to our high standards. Our Communication and Understanding are key. We are always on hand to help and assist you with any questions throughout the build. Our Projects are always built on time and budget. We are fully insured, All our tradesman are Qualified and References available upon request. Regards Rose Projects

Pinecraft construction has been established since 2003. I do all aspects of building work, joinery, plumbing,minor electrics, alterations, extensions,newbuilds,tiling,etc. No job is too big or small. I take pride in my work and will always offer the best of my ability and experience to my customers and always turn up on time as agreed. I offer a great job at reasonable prices to all of my customers.

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Reviewed by Irina on 16/12/2023

We are very happy with the results of our kitchen. Derek did a great job.he is very respectful, profesional and punctual. We will definitely save his number.

Plumbing, groundwork and Underground water services At gcb utilities we strive to provide our customers with a high quality end to end service. we know it can be stressful dealing with leaks, repairs and improvements But with our expertise and professional staff we get the job done in good time and with as little disruption to you as possible. From the first contact our friendly staff have you covered. Whether your looking for a leak fixing,you have pressure issues, need pipe work installing or moving, new water supply or external leak repair With our wiaps, chas,constructionline and water safe approval, guaranteed work your in safe hands Give us a call or message for a free no obligation quote

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Reviewed by Graeme on 21/2/2024

Enthusiastic to sort-out our problem. Planned to meet and it happened bang on time. Came-up with the solution and had the job done within their own time estimate.. Problem solved on time and around the estimated budget. Well done!

Time - Served Joiner Advanced Craft 43 Yrs Experience All aspects of joinery Fire Door Installation Plasterboarding Approved Fitter Wren Kitchen & Fitted Wardrobes - B&Q /Wickes

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Reviewed by William on 10/1/2026

Ernie did a fantastic job on my flooring Turned up on time and cleaned everything up The quality of work is superb and we discussed other jobs I can’t recommend Ernie enough First class and a very competitive price

E SAINT GEORGE Ltd is a London & Essex based construction company. We specialise in all aspects of Home Improvements and strive to provide excellent work in order to achieve each individual clients vision. Our Customer Focused Service, ensures that we Communicate-Resolve-Produce superb tailor made projects. E SAINT GEORGE Ltd has an outstanding track record for delivering projects on Time and on Budget. All of our surveys are thoroughly analysed and concisely priced. Our pledge is to deliver all clients with Flat-Rate Costs for all of our contracted services. At E SAINT GEORGE Ltd, we value our highly-skilled team members as the core ingredient to completing every project successfully. HOME IMPROVEMENT SERVICES: - Kitchen Installations - Bathroom Renovations - Flooring (Laminate/Wood) - Tiling - Painting & Decorating - Structural Engineering & Design Services BUILDING WORK SERVICES: - Loft & Basement Conversions - Extensions (Single/Double) - Rendering / Plastering - Patio & Driveway Installations - Gardening & Landscaping - Gas Safe Services - Electrical Services (NICEIC) - Handy Man Services

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Reviewed by neil on 26/7/2024

Endrit and his team were wonderful to work with - friendly and professional and nothing was too much trouble for them, despite me changing aspects of the kitchen renovation and install during the process. They went above and beyond to ensure that everything was perfect and that I was happy with all aspects. My new kitchen looks amazing and I can't recommend Endrit and his team highly enough - I have already recommended E Saint George to friends and will be getting them back to install my bathroom.

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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.

I am a competent multi trader with many years of experience on construction industry. I am taking responsibility of my works, I have pride in the job and the goal to offer 100% customers satisfaction. All my works are Insured. Previously I worked for housing developers doing and managing the construction and finishing of the buildings and after many years working for someone else and gaining wider experience I choose to start my own business. I am sure that my works will meet your expectations but I am aiming to exceed them.

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Reviewed by Iram on 4/9/2025

Nicolae was punctual, knowledgable and tidy! He tried to identify a leak (turns out the problem may be the washing machine rather than a problem with pipes). He helped rectify the washing machine. He tidied up after himself. Cannot fault him. I have already asked him to return to do other works in my home.

Explore the comprehensive services offered by CDL Building & Carpentry Ltd in the Swansea and south wales areas, we cover all aspects of building and carpentry jobs including comercial and domestic. Some of the job we do are: Extensions Conservatories Loft conversions Kitchens Bathrooms Tiling Garden walls Windows & doors Roofs Repointing Fascias Guttering Flooring Patios Driveways Paving Decking & fencing Plastering All interior carpentry Lime rendering Lime pointing Sand/shoot blasting Fiberglass roofing Fencing New build home / self builds Damp Proofing Complete office refurbishments Complete shop fitting Insurance repair work CDL Building & Carpentry Ltd delivers excellence in every project. Contact us to turn your vision into reality with our professional and reliable services.

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Reviewed by Graham on 13/12/2024

Craig and his team (Carne, Jason and the carpenters) were excellent. They were friendly, hard-working and tidy. They coped with unforeseen issues very competently. The communication between trades and with ourselves was very good. We have no hesitation in recommending them and will use them again.

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.

We are a carpentry based company providing high quality loft conversions in the Northants, Bedfordshire, Buckinghamshire and Leicestershire areas for the last 2 years before that we are carpenters in the construction industry for 18 years please contact us for competitive pricing and high quality work with our architectural partners we can help from conception to completion and negotiate the planning side and building regulations that can be required. Did you know that most lofts can be converted as long as you have 2.3m from ceiling to top of ridge and you no longer require full planning most can be done through permitted development but we recommend that all clients obtain a certificate of lawfulness with there build it’s just better practice of you come to sell your property later on

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

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.

Hello, thanks for stopping in at Courtney Construction! We are a family run general building and landscaping company built on family values. Across the team we have over 10 years in the building trade with various different skill sets. Nothing is beyond our capabilities and we offer a turnkey solution on every project with our customers satisfaction and work quality as our main priority. We cover a large array of different jobs internally and externally, residential and commercial from conversions and extensions to drive ways and garden designs. Between the team we have numerous qualifications from construction, refurbishment and restoration to brick laying and more.

1st Rate Roofing is a small company that values reliability and craftsmanship over anything else. We are polite and always put you first, making sure you understand whats being done and how we are going to do it. We always charge a fair price and believe you'll think so to. We provide free no obligation estimates. We are very responsive to emails and calls!

Hi there we are a plastering and building company We are a family run business Our aim is for customer satisfaction on every job Over 30 years exp All trades back up No job to small or big We cover Edinburgh lothians Fife Scottish Borders Artex removal specialist Damp proofing Fireplace specialist

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Reviewed by Gillian on 26/1/2026

We are a groundwork’s and building company with 20 years experience

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Reviewed by Wyn on 7/8/2025

Jay and his team were very pleasant and helpful, turned up on time, finished the job on time and did a good job. Everyone who has visited me since the job was done have all said what a good job they have done. I would recommend them to anyone. Thanks to Jay and his team

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