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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.

Find a basement conversion

Homefirst avatar

Homefirst

Cellar & Basement Conversion

Home First Services - Qualified installer with over 20 years experience. Providing building and carpentry services. Aluminium and UPVC specialists.

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Reviewed by Umbreen on 24/3/2025

Zane provided an outstanding service in carrying out building works and drainage in our garden We are very pleased with the experience from survey to completion

At Sergola Ltd since 2017 as business running and 2010 as a self employed We specialize in transforming houses into dream homes. From complete kitchen and bathroom renovations to innovative loft & extensions, our skilled team excels in bringing your vision to life. With a focus on quality materials and meticulous workmanship, we ensure that every project exceeds expectations.

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Reviewed by Ryan on 18/7/2024

We are a friendly family run business of 3 generation's We offer a complete building service with all of our trades men in house. we have completed some major restorations such as Vermont hotel 108 bathrooms county hotel full conversion many extensions and house builds also maintenance for landlords and home owners give us a try and hope to see you soon.

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Reviewed by Judith on 28/3/2025

Full property maintenance Handy man no job to big Painter & decorator Kitchen fitting r Bathroom fitting Tiles fitted Full house refurb HMO conversion

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Reviewed by David on 10/12/2024

Absolutely 1st class response by Harj & his team to some very challenging works. Cannot recommend highly enough for any domestic or commercial projects. Good value, reliable, always polite & goes the extra mile to deliver the highest quality.

We are a reliable and trustworthy company. We carry out small and large scale domestic and commercial projects, covering all aspects of construction. We can also offer finance options.

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.

Meyli Build Ltd avatar

Meyli Build Ltd

Cellar & Basement Conversion

We specialize in construction services, delivering high-quality residential, and commercial projects. Our team of experienced professionals excels in design, construction, and project management, ensuring every project meets modern standards and aligns with our clients' needs. We are committed to providing professional, cost-effective services and achieving complete customer satisfaction.

AD handyman Services we will undertake/consider any handyman jobs painting flatpack assembly,,shed assembly/removal, roof recovering, reseal of showers/baths/kitchens blinds/curtainso . Any decking and fencing requirements.... and many more internal and external jobs. All works carried out as efficiently and cost effective as possible without a reduction on quality.

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Reviewed by Kevin on 8/4/2025

Good job well done. Happy to have them back.

Build once and right.me and my team offer you guaranty and security for the work that we perform.we are fully insured and this is the most important thing.we will get the dreams come true with happy end plus we can offer you guaranty for at least 2 years. please see all the pictures below

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Reviewed by chris on 22/6/2023

Excellent job and reasonable prices as

Hi everyone , thanks checking my profile I’m Vas , have more than 10 years experience in construction I got level 3 diploma in carpentry, my main job is carpentry, but being in the industry so long I also can do handyman, fencing, ground work and foundation, decking, etc j

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Reviewed by Emre on 15/4/2024

Brilliant workmanship , did exactly how we needed the shelves to be made. Highly recommended

Hi,my name is Wally my company is old oak building & landscaping we cover a very wide range of the building trade and work to a very high standard,and we always look to work with our clients to get the best finish we can for all thank u for looking

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Reviewed by stephanie on 18/12/2024

Wally and the boys were great, quick and easy and a great clean up job once they were done. Will definitely be getting more done by these guys

We are a building company that have been in operation for over 25 years We are mostly architect or customer recommendations based We can organise a local architect to produce your plans or price plans you already have We are a little old school where we will give you a competitive estimate and then show you the works we are doing also a job we have finished recently

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Reviewed by Jenny on 9/10/2024

P & L have just completed today(9/10/24) our bathroom makeover & we are absolutely delighted with the work done. This was to remove existing floor tiles , prepare for new ones & fit & grout replacements. Then to fit a toilet bowl plus seat. All done in budget and to the timescale promised. They may well be equalled but never beaten. Thank you Peter & Adam you did a fantastic job. Regards Jenny & Jim

S&D Construction Services is a premier general construction business with over of 23 years of Experience in the construction industry, we have established ourselves as a leader in delivering comprehensive construction services with a wide range of sectors including residential and commercial projects across London Our mission is to provide exceptional construction services and client-focused approach to every project we undertake

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Reviewed by James on 31/3/2025

Fantastic job adding textured render around our newly fitted patio doors and on a blocked up old door. Was a particular finish we were looking for and the match was spot on. Highly recommended

DURA POWER LTD is a company that specialises in refurbishment and new build projects, particularly in the education, healthcare and commercial sectors. With extensive experience in these fields, we offer a value-added approach and understanding of our clients’ requirements. We maintain strong relationships with a wide variety of tried and tested subcontractors. This strong supply chain enables us to provide flexibility, manage change and maintain quality. We are capable of handling tendered or negotiated projects . Our financial strengths come from a commitment to reinvest, ensuring a sound financial base is maintained without external borrowings. We have a team of directly employed professional staff who deliver a cost-effective, timely, and high-quality construction solution. Our core team of tradesmen delivers consistent quality and has the ability to be flexible and reactive to requirements. Our long-lasting client partnerships are a testimony to the exemplary service we provide. This level of customer satisfaction, repeat and referred business forms the foundation of DURA POWER LTD success. Our approach is sensitive, innovative and bespoke, driven by challenging and constrictive working environments. We are committed to achieving the optimum solutions across our service delivery, considering logistical aspects to ensure customer satisfaction.

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Reviewed by Anne on 13/4/2025

Family run business since 1995. My son and I pride ourselves in high standards. Design - Build - Maintain. Sustainable builds including extensions and loft conversions. Renewable heating and hot water installations. Full bathroom and kitchen renovations.

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Reviewed by Russell on 19/12/2022

Very pleased with Francisco got our shower working and moved the radiator for us. Good communications arrived on time and also helped us out for another call. Thanks

With over 40 years combined experience in the building trade our company has grown and build an amazing portfolio of jobs and customer clientele. We cover all aspects of building and landscaping no job is to small and no job is to big we can handle them all. Our company cover everything from start to finish on all jobs so no need to worry about sorting anything, making it a smooth process for our customers

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Reviewed by Paul on 7/11/2024

Will pleased with the work carried out pleasant friendly staff great service A1+ i will recommend this company. thank

H&H Building & Joinery is a joint partnership company which has been trading Since October 2015. We have over 25years experience in joinery and preservation. We also supply a number of other trades including plumbing,Electrial,Plastering & Roofing.

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Reviewed by Mathieu on 1/8/2018

H&H were really quick to reply to any questions or requests that I had. They are very professional and the job was done in the expected time. I am very happy with the result, I would definitely recommend them.

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

Comprehensive Building and Landscaping Services by R Richards Builders & Landscaping R Richards Builders & Landscaping is a family-owned business with over 30 years of experience, specialising in a wide range of construction and landscaping services. Our Services: - General Building: We undertake all types of general building work, ensuring high-quality craftsmanship in every project. - New Builds: From planning to completion, we provide comprehensive new build services tailored to your specifications. - Extensions: Whether you’re looking to add more space or enhance your property’s value, our extension services are designed to meet your needs. Renovations: We offer expert renovation services to transform and modernize your existing spaces. - Restorations: Our team is skilled in restoring properties to their former glory, preserving historical integrity while updating functionality. - Groundworks: We handle all groundwork projects, including foundations, drainage systems, and site preparation. - Landscaping: Our landscaping services cover everything from garden design and maintenance to hardscaping and outdoor structures. Why Choose Us? With a commitment to delivering the highest standards of service, we pride ourselves on completing projects on time and within budget. Our team is passionate about quality and customer satisfaction, ensuring that every project, no matter the size, is executed with precision and care.

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Reviewed by John on 5/11/2024

These builders did turn up and have worked on the chimney. However, I've not received photos of the job they did or received a guarantee as promised. There is damp in the wall still After several attempts to contact them, I've recieved nothing back.

Very honest , transparent, and polite team , providing a service from concept design to finished product Unfortunately last job was unfinished due to an accident in filey in where I drowned trying to rescue someone in the sea Tragic failed rescue has miraculous happy ending , on youtube I suffered memory loss and severe problems after this and after working for another firm for short while I am ready to start again on my own so please take this into consideration with my last review

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Reviewed by Torsten on 30/10/2022

Unfortunately, over 12 months into the project, it is still not finished. There were a few circumstances outside of Tom's influence, but the delay's have been accompanied by repeated lies about finalising the project, and poor quality of the work that has been done.

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