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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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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

We take proud in our work .our priority its our costumer.We undertake all kind of work from small to big projects.For a free estimate do not hezitate to contact us.

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Reviewed by Kambiz on 15/5/2024

Very efficient

16 years experience in the rendering and plastering trade

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Reviewed by Janice on 28/10/2021

Did a brilliant job on side of house, working in terrible weather, would recommend.

we are Masons with over ten years experience, all four of us are level 3 qualified and take great pride in all of our work carried out and put 100% into everything we do we never leave a job until we are happy the end product and customer satisfaction we undertake everything from plumbing to eletrics new builds to extentions to changing a roof tile. no job to small.

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Reviewed by Richard on 11/7/2024

They do exactly what they promise

Trading as intrendbuilders and tesscon co uk search us on google We are a friendly, hard working & affordable company who specialise in All forms of roofing and general building, maintenance, fencing and landscaping, waste removal, end of tenancy property clearances, wooden & laminate flooring and more in all areas of Birmingham & surrounding areas.

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Reviewed by Mike on 7/11/2025

Richard and his team did a great job of replacing our garden gazebo roof. Pete and the lads who worked at the property were professional and courteous throughout and I’d have no hesitation in recommending them.

Monta Ltd avatar

Monta Ltd

Cellar & Basement Conversion

We offer bespoke furniture and construction to commercial & private clients. Fully equipped manufacturing facility with spray shop / in house tinting machines for paints and polished plasters. We offer: Home extensions Loft conversions Structural work Underpinning Internal refurbishment Basements Furniture, made to measure: Bathroom cabinets Kitchens Wardrobes and other bespoke furniture.

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Reviewed by Darren on 9/5/2025

Monta Ltd where very professional and extremely helpful throughout our bathroom refurb. They offered advice throughout the process and never gave any hard sale but explained the options and what it would mean and cost for any changes to what we wanted. The final outcome was a beautiful bathroom that makes us feel like we are in a top class hotel.

With over 15 years building experience in the construction industry, GN Building Services (Stafford) Ltd are experts in all aspects of construction and project management. We specialise in both traditional and cutting-edge design and building methods. GN Building Services (Stafford) Ltd is not only a building company. We cover the entire project, from planning, design, building, renovating, electrical installation, tiling, and plumbing. We do not use subcontractors; all work is completed by our own employees. This means no delays, no waiting for specialist tradesmen; we finish the entire job within budget and on time.

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Reviewed by Sarah on 4/8/2016

If you want building work done then GN Building Services are brilliant, not just excellent!. Before we said to go ahead he had introduced us to four former clients and showed us the work completed. He and his team are probably the hardest working tradesmen I have ever come across and talk about working to time and budget. I should really keep this review quiet as they are very much in demand and I need some more work doing - but I can not rate them highly enough.

I m building services Home repairs Electrics Painting and decorating Internal and external landscaping groundwork's building services renovation conversion timber building and out building driveways shed bases

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Reviewed by ALLEN on 11/8/2017

Ian & Jason, were very professional, turned up on time and cleared all the debris on completion, did a very good job of re-felting shed roof. thank you Ian & Jason. allen@exactinteriors

I am a independent Plumbing and heating Engineer, I have been in the field for around 8 years. I take my work seriously and take pride in my work, and want to be of best service to each customer I meet. thanks wayne

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Reviewed by Gary on 23/7/2023

Excellent service!

Welcome to LBS building services formally called capstick & oconnor. We pride our selves on our highly skilled, helpful friendly team. We offer a second to none service always aiming for the highest standards of workmanship at prices that are affordable.

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Reviewed by Amanda on 6/3/2018

Prompt and professional, thank you!

Plum Building Services Ltd is a building company based in London. We work for both landlords and private home owners on new builds, extensions, refurbishments, repair and maintenance. No job is too big or too small. Quality is our guarantee.

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Reviewed by Philippa on 28/10/2025

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Reviewed by Tim on 12/12/2018

Came at a moments notice and solved our problem. Thanks!

QI Building Solutions is a construction and design company with over a decade of experience in the sector, servicing the areas of Essex, Kent, and London. We are known for our meticulous work, responsible attitude, commitment to deadlines, and attention to detail. Our Services: 1. Dry lining If you’re looking for a dry lining contractor in the area of London, Kent, or Essex, you don’t need to look any farther than us. We have over 8 years of experience installing lightweight cold rolled steel structures, metal frame partitioning, and suspended plasterboard and gridded ceilings systems. We recognize these complex finishes need to be installed carefully so that your project is completed to the superior standard you deserve. Our team of installers and managers ensures our clients’ peace of mind. Everybody we work for can rest assured that we’re able to carry out any dry lining project as instructed. 2. Plastering / Tape and jointing QI Building Solutions offers plastering/tape and jointing services for commercial and residential projects. Our efficient, professional team ensures a finish of exceptionally high standards irrespective of the complexity of the work. As some dust can be created as you sand down in the process of tape and jointing, we utilize dust extractors to keep that down to a minimum. It is fitted to a drywall sander and makes sure the work environment will remain pleasant and risk-free. We also offer great rates and work with the highest-quality materials, such as Knauf and British Gypsum. Of course, our clients are more than welcome to choose the materials and manufacturer – we are happy to work with your selected brand! 3. Tiling With over a decade of experience, QI Building Solutions has a spotless reputation (to quote the great Shakespeare) in this field. The reason is because we deliver superior work, incorporating everything from offices and small retail sites to complicated residential buildings. Please know that no job is too big or too small for us! Qualifications Our team carry the necessary City and Guilds/NVQ qualifications to carry out their jobs. Our qualified supervisors have passed SSSTS training. Insurance For your peace of mind as well as our own, we have £5 million public liability insurance and £5 million employer’s liability insurance.

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Reviewed by Raj on 29/6/2018

Build of custom tv enclosure executed to perfection. Turned out to be a lot better than expected and would definitely recommend to others.

I.VELO CONSTRUCTION offer a professional and comprehensive renovation and home improvement! We have a lot of practical experience and a very good and modern technical facilities. Our customers are individuals and large companies. We approach each project individually. We assure professional help in adapting design and selection, buying and transport of materials. We guarantee honesty, punctuality and quality of service. Always work safely, completing all jobs to an extremely high standard, whilst aiming to reduce inconvenience for our customers. Our priority is your satisfaction with a job well done. Please feel free to contact us at any time, We are always happy to provide our services to all our customers

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Reviewed by June on 18/3/2023

Indri and his team did a very professional job. They were efficient, helpful and cheerful. Everything was cleared up after the work was finished. I would not hesitate in using them again or recommending them to others.

With over 10 years experience, our well qualified and certified team of hard working craftsman and specialists have a proven record of quality workmanship. We will help you with Painting & Decorating, Surface Preparation, Surface Protection, Storage Solutions, Bespoke Furniture and Carpentry. Most of our jobs are residential projects. When a homeowner works with my team, the process will look like this: - I offer a free visit to meet the client and discuss the job further, - Then I sent a quote and clearly explain what should be agreed before the job begins. I am always open to discuss end explain my quotes, - As soon as the job is confirmed, the client and my team agree on the start date, - We make sure the surroundings are protected before the job starts - We order the materials - We complete the job - When the job is finished, I always leave the floor protection for one day to make sure the client's expectations are met (or exceeded!) and once my client is happy I remove the floor protection and clean around. We are creative, we care and we exceed our clients' expectations. The protection of the surroundings is included within the initial quote, our highly skilled team of trade specialists focuses on high quality results and the materials supply and advising happen at no extra fee. Lastly e most important, a homeowner should choose West Home Renovations because we make your remodelling process stress-free and easy!

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Reviewed by Nel on 8/12/2022

Very communicative. Did a brilliant and thorough job. Would not hesitate to recommend. Thanks so much!

Garth Builders Ltd. for building and roofing services Building and roofing contractors provide a range of domestic and commercial building services. But we are not your average building and roofing contractor. Call us for a building or roofing service. We might just surprise you. We can undertake all kinds of building and roofing works. Building and roofing services are also known to charge exorbitant prices. However, our aim is to provide all customers with affordable building and roofing services. So if you are a homeowner or a commercial enterprise who needs a building or roofing work done, we are the company to call. We also work for the local authority so we understand the necessity of doing a good job. We are are fully compliant with safety and health regulations. Why Garth Builders Ltd. for these services? For more than 40 years, we’ve become a trusted and established name in building and roofing work around the city and nearby places. Rest assured we can meet your building and roofing needs with our safe work systems, use of superior materials and quality workmanship. We have the skills, expertise and the knowledge to work on any type of building and roofing project. We are always investing in and embracing new techniques so we are up to date with recent advancements in products and services. It also means we can provide a range of building and roofing services, all of which can meet your specific requirements. We also accept insurance for our building and roofing work, so please call us for the details. Our aim is to achieve great results and to ensure our customers requirements are reached with efficiency. Contact Garth Builders Ltd. today Thanks to our attention to detail and quality workmanship, we have a number of customers who rely on us for their building and roofing requirements. For any building or roofing work in this city, depend on Garth Builders to deliver quality services at very competitive rates. You can take our word for it. The services we offer are as follows All types of building works undertaken Extensions Conservatories All types of ground works Drainage Joinery works Plastering Flagging Roofing repairs Re-roofs Windows doors Pointing Dry verge systems Fascias & soffits All types of guttering works

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Reviewed by Graeme on 4/4/2024

Prompt response, and a good price, but the cricket club committee choose a local company nearby our club, with a similar price to the this business. Great communication from Jack.

We are a building company based in Burton on Trent. We deal with wide variety of specialists that include: Painters and decoraters Plasterer/ Renderer Brick Masonry Extensions Bathroom design and instalation Professional tiling service Joiner Tiler Floor fitters Gardener / Landscape gardener Loft conversion specialist Roofer Stoneworker/ Stonemason

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Reviewed by Martin on 10/7/2018

I first thought it was going to cost too much but they worked very hard, we were very impressed that they worked so hard during the very hot weather. Excellent work l would highly recommend.

Pearlcontracts is a small firm based in Montrose Angus with two teams of professionals for your home improvements.

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Reviewed by Avril on 17/12/2020

First class job by John and the guys. Turned up on time to view the job, very knowledgeable and thorough assessment. Work completed to our agreed timescale and to a high standard, photos supplied to show before/after, important on a roof! Reasonably priced and very pleasant. Would highly recommend - in fact just had them back to do some more work.

Christian avatar

Christian

Cellar & Basement Conversion

C C D General Building is a company designate to take care of your job from the quote job to the end of it

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Reviewed by Sajjad on 1/6/2020

Christian reversed the swing of the door for me in a room. He quoted quickly and his price was fair. He came quickly and did the job well. Would like to work with him in the future

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 owners needing to make an insurance claim. We project manage and carry out the required repairs using our fully vetted contractors. Aspray always strive to reinstate the property to its pre-incident condition as swiftly as possible. Aspray Ltd are authorised and regulated by the Financial Conduct Authority for claims handling only.

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Reviewed by John on 14/5/2023

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