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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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Reviewed by Julie on 5/6/2024

Excellent, efficient job and area was left incredibly clean and tidy at the end. Very good communication throughout the quoting and arranging process. Highly recommended.

Gulf Builder Ltd company made up of a highly skilled team of professionals who will take all the hard work out of your house refurbishment in London. Whether you want to refurbish your entire house or a single room. You can read below what else we do; - Transforming Spaces, Inspiring Lives. - Revive, Renew, Redefine. - Renovate and Elevate. - The Art of Renovation. - Design. Renovate. Inspire. - Your Vision, Our Expertise. - Discover the Joy of a Perfectly Renovated Space - Turning ideas into action. - Built on trust, focused on quality.

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Reviewed by Hoss on 5/8/2024

I was looking for a builder to do an extension at back. Gulf Builder provided me with advice on materials, exact cost and time. They have done a fantastic job in short span of time and delivered the job to my absolute satisfaction. Rare to find.

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!

Professional , friendly and thorough of customers needs . All types of property works covered with many skilled tradesmen . All works bespoke to requirement .

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Reviewed by Arjun on 17/5/2021

There was additional work conducted on some leaks through my window and I have noticed that this was not foxed. I have just noticed that the leak for the work done on the window has come back. This is therefore not been fixed.

Axle FM avatar

Axle FM

Cellar & Basement Conversion

Axle FM is your go-to partner for premium facilities management services tailored for the domestic market with our specialist Domestic Team. Our consumer-centric approach ensures that your home maintenance needs are met with expertise and care. From household repairs to property security solutions, Axle FM is committed to enhancing your home. Trust us to provide reliable and effective facilities management services that cater to your home's specific requirements.

We offer 24/7 solutions to all your property maintenance needs, whether it’s a small task such as assembling a desk or a seemingly daunting full house refurbishment. It is our extensive experience within the industry, combined with passion, innovation and dedication that makes our clients choose us for all maintenance or building services required. Our professional staff will guide you from your first encounter with us all the way to billing and subsequent repairs and we guarantee that you will look nowhere else for assistance!

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Reviewed by Lii on 16/8/2024

Nizar provided a quote for thorough work very efficiently. Even though my budget didn’t stretch to cover the quote, Nizar’s professionalism in handling my query was very impressive.

Are you seeking an honest, reliable, and professional plastering service to transform your property? Look no further than Pawel Plastering. With over 20 years of experience in the industry, we’re skilled in working on all types of properties whether residential, commercial, or industrial. Choose us to complete work of the highest quality, regardless of the size of the job. Let us help you with plastering, taping and jointing, stud walls, bricklaying, and more. We can meet a wide range of needs; visit our services page to find out more.

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Reviewed by Stephen on 2/8/2021

Pawle was the only contractor of those who expressed interest to get back to me. He visited and was most helpful. He has quoted for the job which I have accepted.

Please check our Checkatrade reviews! This is a new account. Ellis Roofing and Building Ltd based on the Wirral. Covering Wirral and surrounding areas. Our goal is to exceed the expectations of every one of our customers offering a wide range of building, joinery, bricklaying and roofing.    We have a vast knowledge and experience to provide our customers with outstanding results for any of their construction needs.    Our prices are competitive and we offer great customer service.

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Reviewed by Joanne on 7/10/2024

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Reviewed by Francesca on 16/11/2024

A hands-on Senior Manager with over fourty years’ track record of building conversions, renovations and ground-up builds. Highly analytical in examining building projects; a fastidious note and record taker who enjoys problem solving at a very practical level. Started as a welding Engineer and quickly progressed into a variety of Managerial roles. Able to inspect all aspects of building work in construction processes whilst reducing build time and expenses. Ability to assess and quickly advise on relative legislations and cost-cutting issues, with safety always in mind. Extensive people experience on both sides and having the ability to mentor and explaining legal aspects and complex issues to all levels of the team. • On- and off-site Experience • New Buildings, Alterations, Extensions • Carpentry • Plastering • Tiling • Boilers, Plumbing, Gas Safety and Electrical Experience

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Reviewed by Chantal on 12/1/2022

That’s not true and our rating remains the same as unsatisfactory and disappointed I’m afraid.

We do all aspects of bathrooms and minor building works, we take pride in our work and enjoy leaving the customers with a smile on their faces.

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Reviewed by Dee-Dee on 11/8/2024

Our build prerequisites were to divide a room & close an open archway, build two extra walls, move steps and a handrail, put in two entrances with doors for the new build and paint & carpet this area. Matthew (MDCC Construction) was qualified and very helpful – giving us good advice. He is an honest, tidy and thorough builder, willing to accommodate the building manager's questions and happy to make amendments. We were thrilled with the speed and finish of this build, and we will definitely use them again.

Hi my name is Tom I’ve been plastering for 20 years. I provide a clean helpful service and i do my up most to meet customers requirements

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Reviewed by Catherine on 7/7/2021

Tom came to skim my son's ceiling but because it had old artex and very uneven he decided to put a false ceiling in, board that and then skim it. Tom is a really friendly guy, kept showing me where he was up to in the job and was very tidy and did a great overall job at a good price. Wouldn't hesitate to use Tom again or recommend to friends and family.

DANTEFORGE avatar

DANTEFORGE

Cellar & Basement Conversion

Dante Forge and Building Restoration has been trading for some 30years We carry out all aspects of building renovation and restoration sympathetic to listed and period properties We cover all aspects of metalwork/welding ferrous and none ferrous on site and in house we are HETAS registered engineers qualifying to fit wood/multifuel stoves fireplace alterations together with flue lining and installing chimney systems

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Reviewed by Dave on 31/7/2024

Responded quickly to the posting & did a great job.

www.kbaconstruction.online MAKE YOUR HOUSE INTO A HOME TODAY WITH KBA CONSTRUCTION'S We are a building company with many years combined experience. working as Builder in London (UK), we help to make your house a home or property investment you can rely on.

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Reviewed by Connor on 13/9/2024

Did a fantastic job and at good price

Hi we been doing these jobs for last 20 years .what are the company does ! hard landscaping and soft Landscaping? brickwork paving and patios wooden and Concrete sheds ?fencing general tidy and drainage? And driveways?. Please give us a try you’re not going to be disappointed as you can see all my Your writing is five star thank you?

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Reviewed by Dave on 26/7/2024

Shpend and his team did a great job for us. Really good value for money, and great quality of work. He was very professional and gave his expert advice when needed to help decide on best approach in resolving pre-existing issues. We would definitely use this company again.

BMR Ltd avatar

BMR Ltd

Cellar & Basement Conversion

pp

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Reviewed by David on 10/6/2023

Very pleased with the work carried out by Theo and Wesley on my back garden. They worked hard during the time they were here, they were very tidy, bagging and removing all waste from site on completion. They completed the work to my satisfaction at a very competitive price. I will be looking for them to do further work for me soon David Marsh

A small friendly company doing a small to big jobs from a single kitchen door to a complete refit and same for bathrooms a tap up to full refit Everything can be done from start to finish All trades so no need to get your own plumber or tiler or electrician we do the whole job to speed up install

LOOK FORWARD TO MORE LIVING SPACE Do you or your family need more space? Maybe a house extension to provide a dining room or a new kitchen? Perhaps you’ve increased the size of your family and now need further bedrooms? Our experts can help you decide where and how you extend. Our services include: EXTENSIONS & PORCHES GARAGE & LOFT CONVERSIONS RENOVATIONS ROOFING - Flat Roofing - Conservatory Roofs & Roof Windows - Roof Repairs and Replacements - Fascias, Soffits & Guttering We use expert advice even before you finalise your plans. If you can’t build outwards have you considered a loft conversion? Our dedicated page will provide more information. Standard Building have helped many people extend their living space over the years and we never get tired of seeing satisfied clients enjoying their new found space.

Handyman Services, Loft Storage Solutions, Custom Made Furniture and solutions for your house. Years of experience in construction, with background from new build.sites, snagging and finishing, hillarys blinds, loft conversions and boarding/insulations, with social housing 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

Q Cama avatar

Q Cama

Cellar & Basement Conversion

Hi, I do high quality Carpantery work. -Fitting doors -kitchen fitting -wooden floor installation as well as sanding and varnashing -Fitting sash windows

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Reviewed by andrew on 2/7/2012

Qamil He constructed our loft conversion, which we more than happy with. He paid attention to detail and followed the drawings by the architect precisely.He was always willing to discuss any issues and communicate his next plans for the ongoing work. As he was hardworking and punctual the work was done to programme. Would highly recommend him and all the sub-contractors that he has used. Tracey and Andy Sparks

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