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Get everything you need to know about finding a house extension builder. Get a quote for single or double floor, rear, side and return extensions. Below, we cover tips to help you find a local extension builder:

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Take a look at our House Extension specialists profiles, read reviews and request quotes directly.

How to find a reliable, local extension builder

A house extension can transform your property, adding a lot of living space and value to your home. Whether you need a new bathroom or want to expand your kitchen, a home extension may well be the home improvement solution for you.

To make sure that building work goes as smoothly as possible, we recommend you hire a local building service with enough expertise to carry out a high quality job.

What can a house extension builder help you with?

A house extension is a great solution for homeowners who need more space, but don’t want to move. They add a lot of value to your property, helping you make the most of your spaces by allowing you to reorganise the layout of your home.

A house extension specialist can help with:

  • Single storey extensions
  • Double storey extensions
  • Side extensions
  • Rear extensions
  • Wrap-around extensions
  • Garden rooms
  • Basement extensions

Other space-adding improvements include installing a conservatory, a garage conversion or a loft conversion.

Rear and single storey extensions tend to be smaller and less expensive to install, whilst wrap-around and double-extensions offer more space but cost more to build. Not sure what type of extension would be best for your home? Read our 2023 extension cost guide for more details about the different extension types, or speak to a skilled extension builder today to get some advice and a free quote.

Find an extension builder

Picture of a brickwork side extension with large windows and skylight

Factors to consider when choosing an extension builder

It’s really important that you choose a reliable extension builder company to carry out work on your home. Failing to do this can result in stress and expensive repairs. 

Before you hire, you should do your research to ensure that your builders:

  1. Are an experienced company with a strong history of successful projects
  2. Have all the necessary 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 local extension companies

A local extension contractor is more likely to respond quickly, as they’ll be right around the corner and ready to help.

Post a job today to find a reliable, local extension builder.

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How much does it cost to hire an extension builder?

Illustration of a man with a beard surrounded by different extension types, each labelled with costs to install

How much you’ll end up spending on your house extension project depends on a range of factors, including the type of home extension and its size, and where you live in the UK.

On average, you could spend anywhere between £45,000 and £160,000 on a house extension. Buying a prefab is a cheaper solution, ranging from around £45,000 – £55,000, whilst wrap-around and basement extensions are on the upper bracket range, costing upwards of £60,000.

Read our 2023 extension cost guide for the full list of costs, as well as more information about the different extension types available, and money saving tips. Or, for a more accurate quote for your specific project, speak to an extension building service today.

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What planning permission do you need for an extension?

Whether or not your extension project will require planning permission depends on whether it falls under permitted development (PD) rights. If you want to go beyond these rights, such as by building an extension that’s bigger than 50% of the total land area around the original house, you’ll have to apply for permission before building works can begin.

Most planning permission applications take between 8 and 12 weeks, so make sure you factor this into your project timeline.

For more information, read our planning permission guide or visit the Planning Portal website.

Picture of a modern second storey house extension with large window that has a black frame

Questions to ask a local extension builder before you hire

Whether you want a kitchen extension or a new bedroom with an ensuite, we recommend you ask the following questions before you hire a building service:

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 extension builders 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 builder what insurance they have before you hire them. This will guarantee protection for both parties and ensure your builder is legally compliant.

How many years of experience do you have?

Knowing how many years of experience your extension builder 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 builder 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?

If your extension builder is planning on using subcontractors, then it’s a good idea to confirm the qualifications and insurance coverage of everyone who will be working on the project. Your builders will almost definitely be using a team of specialists, including plumbers, heating 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 is for completing the project  will help you set realistic expectations about how long your extension 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.

Picture of a side extension with a tiled, slanted roof and plants around the side

Tips for working with a local extension builder

  1. Be crystal clear about what you want and how much you’re willing to spend. Clear communication is key to ensuring you and your extension builder are on the same page about your project’s requirements and your budget constraints
  2. Stay in the loop and ask for updates as the project unfolds. This will allow you to address any potential issues before they escalate
  3. Make sure you document agreements or changes to the original plan. Keeping a written record of all modifications to your project, including timelines and costs, will serve as a valuable reference point to prevent misunderstandings and ensure work is carried out to a high standard
  4. If you have any concerns, talk to your extension contractor straight away. Open discussion is more likely to lead to a swift resolution, and will help you maintain a positive working relationship with your builders

Find an extension builder

Over 16 years experience carrying out extensions from the ground up to roofing, briclaying, plastering, rendering, painting and decorating and refurbishments. Our team prides itself on perfection and customer satisfaction.

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Reviewed by Philip on 11/6/2024

James did a great job and I ended up combining two jobs we needed into one. Highly recommend

Hi ,I'm ludovic mate from LM PAVING BRICK WORK COMPANY and I have more than 20 years in construction industry such as ,brick work ,paving renderer building repair and many more ,I set up the company in 2017 and I'm still in the business

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Reviewed by Vincent on 29/2/2024

New to Rated people after 23 years in the industry. All aspects of building works. Large scale projects, all new data installation works commercially. Fully insured Full portfolio of works, live projects, Refurbishment works, full house renovations, right through to new builds and extensions. Free quotes and surveys In house design team.

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Reviewed by Asrar on 4/4/2024

Our bespoke building services ensures that you can get the exact kind of work you need and want. Whatever work you are looking for we can assist. From renovations to full build extensions, we can help. Our projects can be tailored to your exact needs and preferences, with all the services required provided. Our tradesmen lead by example, only ever working within the strictest of building principles. We only employ the highest quality builders and tradesmen to deliver your project on time and to the highest standards. Each one of our jobs is handled completely bespoke, suited to match each new client’s requirements. We provide a range of different building project types, from small and simple porches, to rear, side, front and wrap-around extensions, loft conversions to full kitchen extensions and renovations. We are a fully licensed and insured building company. We hold all the necessary licenses and certifications required to operate legally in the UK. Additionally, we carry comprehensive insurance coverage to protect our clients, team members, and projects. Our expert team can be there from the very beginning, helping you plan out your proposed works, before the building even starts.

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Reviewed by Andrew on 18/4/2024

Object Builders got in touch and we now have agreed terms for eork going forward.

Full property renovations, extensions, loft conversions, outbuildings & more.

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Reviewed by Samira on 28/1/2024

Thanks a lot for quick and hassle-free job you guys did for us. Very happy.

We pride ourselves on being a friendly, family run business based in Derbyshire. With experience spanning 30 years, we can offer a comprehensive home improvement service. From a simple replacement glass unit through to an individually designed conservatory or extension, we can offer a service you can trust. If you love your home we can help you love it a bit more. We can also assist with planning applications and building control- plus we can introduce you to accredited tradesmen, such as gas safe engineers and certified electricians to help you finish every project to the highest standards. Contact us today for a free quotation- no pressure and no obligation. References available. Fensa and CPA registered.

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Reviewed by Michael on 24/1/2024

We are a complete building service. Our objective is to provide the very best standard of redesign and refurbishment needs. With a diverse set of skills, across a hardworking and motivated team, We specialise in various sectors and offer a full range of building services; • Loft conversions • Extensions • Supply and fit kitchens and bathrooms • Plastering and rendering • Plumbing and electrical works • Internal decorating • Bespoke carpentry work . complete garden landscaping, driveways and garden renovation. For a free no obligation quote or to discuss your ideas/enquiries in further detail, please get in touch!

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Reviewed by Graham on 13/5/2023

Our entrance way reconfiguration project is now finished, and it has exceeded our expectations (& we are very fussy!!) it looks simply amazing. Everyone that has seen it has asked for the contact details of the builders as the finished results are show home like. Craig and his team really know their stuff, work hard, will keep you appraised of the project as it develops and work to a truly excellent standard. We would definitely recommend them if you want quality workmanship and a team you can trust.

Are you looking for an honest, reliable builder with an excellent attention to detail to bring your plans to life? Are you looking to create to an open plan kitchen extension to bring the family together, or even an office in your garage as you're now working from home or maybe an extra bedroom in the loft to create more living space? 1Horizon Design & Build Limited is a construction company offering complete building services throughout Northamptonshire and surrounding areas. Through design and planning to building and completion - our approach is always the same - strategic, professional and with true attention to detail. We pride ourselves on our communication, we keep clients updated every step of the way to ensure they know exactly what’s going to happen and when. Our services include - - Extensions - New builds - Renovations - Loft conversions - Garage conversions - Garden rooms Please get in touch today, and discover the advantages of working with 1Horizon Design & Build Limited.

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Reviewed by Matt on 15/9/2022

We are very happy we went with 1Horizon. We wanted to do some of the internal work ourselves and they were the only ones we spoke to who agreed to this. They were happy to work with us on our quote to get what we needed. Aiden and his team were friendly, honest and reliable throughout and the standard of work provided by all trades was excellent. I would have no hesitation in recommending to others.

CML Property Maintenance are proud of there friendly and trusted relationships with all its clients. We always put the customer first, you and your property are our Number ONE priority. Call us any time we would love to help.

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Reviewed by Nicholas on 26/4/2023

6/5 stars. Outstanding work from Chris and his team carried on our recent building project. We could not be more pleased with the finished result and the professionalism shown throughout the process. From the initial (honest) consultation to the final handover, Chris' team consistently demonstrated a high level of expertise and attention to detail. The work was completed on time and to an exceptional standard, with clear communication and regular updates. Would recommend without hesitation.

We believe that no job is too small. From home refurbishments to large commercial contracts, we are experienced and knowledgable to get the job done for you! Every job is managed by coowner Michael to ensure every project is delivered to the highest standards. We work with you every step of the way to capture your requirements and ensure the result is just as it was envisioned. We take pride in our ability to provide professional, timely and experienced services.

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Reviewed by Mohit on 1/3/2024

Michal and team did a great job in adding office room, remodelling and fitting new kitchen, flooring and renovating the full house for us within 2.5 months. All team members were professional and worked very fast to complete the work on time.

Welcome to Rothwell Contracts & Rothwell Kitchens Ltd Nottinghamshire based family run businesses

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Reviewed by aftab on 3/9/2023

Whoops, sorry, about the last comment about rcl builders, that comment was to another builder.

Here at midland construction we are a family run buisness with 35 years experience in the building trade we specialise in exstensions patios orangerys and all kinds of building work undertaken we don’t employ salesman

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Reviewed by Richard on 14/1/2024

We'd have no hesitation in using Steve and his team again and would highly recommend Midland Construction. They completed our extension to a high quality for a good price, whilst being friendly and approachable throughout. Steve and his team were easily contactable and very proactive in resolving any issues encountered throughout the course of the work.

James Building & Roofing Cambs offer the complete professional construction services. We specialize in extensions, conversions, alterations & all aspects of pitched and flat roofing ,We are an reliable company with over 20 years’ experience in the building trade. Based in St. Ives, we cover the whole of Cambridgeshire. At James Building & Roofing cambs , we believe that your house is more than just bricks and mortar, it is your home. We pride ourselves that we can deliver reliable and personalised service to all our customers. We offer an extensive range of construction services. Our expert builders & roofers ensure all of our work is carried out to the very highest standards of quality and safety. If you would like to find out more, we also offer a free no obligation quotations to assess your individual requirements and will always treat your home with the utmost care and respect. If you are looking for Extensions Loft Conversions or any building work in the Cambridgeshire area, you can be sure that all our services are carried out carefully, efficiently and to an exceptionally high standard of quality. We are happy to undertake domestic/commercial work. At James Building& Roofing no job is too big or too small. All work undertaken is fully insured & guaranteed

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Reviewed by GARRY on 10/4/2024

Very pleased with the demolition of my conservatory. All done in one day, and site left clean and tidy. Removing the concrete base was a much bigger job than anticipated as the base was very deep, but the work was completed without complaint, and at no extra charge.

Welcome to RHI Developments Ltd. RHI Developments Ltd provides a full range of construction services including Double Storey Extensions, Single Storey Extensions, Orangeries, Conservatories, Garage Conversions, Window and Door Conversions, Fascia & Sofits, Porches & Renovations. RHI is also a leading supplier of fitting Windows and Doors throughout the South Yorkshire region including Sheffield, Barnsley, Doncaster, Chesterfield and Rotherham. RHI Developments Ltd has a 100% customer satisfaction rating with Independent Warranty which gives you confidence from start to finish. For all extensions, orangeries and conservatories we can arrange all stages of your project from design to completion. Also you can be confident in the quality of our work by requesting references from our all our satisfied customers and view our recent projects.

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Reviewed by Simon on 7/12/2023

We agreed 8 to 12 weeks to complete but ended up taking 9 months due to excuses that they had to go on other jobs

weardale construction have been in business for over 16 years our main works arte extensions loft conversions sun rooms and conservatories ,we are a team of 8 covering all services without the need to sub contract out any works

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Reviewed by John on 24/5/2024

I couldn't be happier with the work I've had done! A full kitchen fit with tiling, plumbing, and flooring etc plus decking and a pergola in the garden. All the tradesmen are employed so arranging contractors isn't a problem. The men are friendly and very good at what they do. Nothing is a bother for them. I highly recommend this company and will use them again for future projects.

Established in 1994 we offer a comprehensive building service for kitchens, bathrooms, alterations, extensions or new builds. I have over forty years experience in the industry and twenty five of those with UK national housebuilders. If you have a project we provide a free consultation and a fixed price quotation with a full specification attached. Our design and build service can take care of the complete project to provide you with a turn-key completion. Our tradesmen are all qualified and experienced and we are fully insured to include design liability.

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Reviewed by Mark on 13/11/2023

Andrew company was excellent throughout the small project in kitchen /diner . This team are professional tradesmen’s and very hard working They cleaned up every evening before leaving and collected the rubbish throughout the project. Overall summary five star ??????????

We are a team father and sons, with over 30 years of experience in Wood Occupations and construction sites, whose goal is to provide our customers with quality services.

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Reviewed by Priyath on 22/3/2024

Pleasant to deal with. Few bits needed finishing never came back. Which was disappointing as this was promised.

Thank you for considering PG Home Developments, we are a caring, concentious and skilled company that undertakes all home improvements... from small repairs 2 larger extensions and conversions. On every job we do as we say. We strive for repeat business

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Reviewed by Patricia on 4/10/2022

If you need an extension built, then Paul is definitely your man. Very pleasant to deal with and very capable and efficient. He has been in the building trade for nearly forty years, and really does know his trade! I would certainly be very happy to use Paul again. Thank you Paul - you've been brilliant.

I have been established for 13 years and cover all aspects of building. We specialise in extensions from footings to completion. We have extensive experience in structural steel work and jobs that are potentially difficult due to limited space. We have completed work for new customers to view and by contacting us we can arrange the nearest job for you to view. We cover all of Essex and are also happy to travel to London and Kent.

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Reviewed by Jack on 17/1/2023

Graham and his lads were great. Would highly recommend for your building works. Was always open book about costs and plan of action, spoke on the phone regularly and was always easy to get hold of to give you that piece of mind. Full kitchen extension 5m x 3m from start to finish. Trusted with access to the property and never had any issues.

We are a company that has been trading for the last six years in its current form. Before that I was a self employed builder for 25 years working on many projects ranging from new build, self build to small maintenance work . We now primarily do mid size extensions as well as new build, renovation and conversion. We also manufacture garden rooms and Glamping pods. We will Take a look at all jobs large or small. I am a time served bricklayer with city and guilds qualification and HNC. With an extensive knowledge all aspects of the building trade All our tradesmen are registered with the appropriate institutes and with certification. All work is guaranteed and fully insured.

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Reviewed by Viv on 3/11/2023

Very pleased with finished job. Subbies used were excellent. Highly recommended.

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