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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

At Rated People, we understand how daunting it can be to invite a stranger into your home for a major project like a house extension. That’s why we connect you with trusted local house extension experts who have been thoroughly vetted and reviewed by other homeowners. With over 10,000 skilled tradespeople on our platform and more than 3 million satisfied customers, you can count on us to find the right professional for your house extension needs.

We know that large projects can be overwhelming, so we provide extra support to help you find all the right tradespeople to ensure the job gets done right. You can check previous reviews to see the quality of work our tradespeople deliver, giving you peace of mind before you start. If you need more information, read through our helpful guide below. And if you are a house extension expert, click on the link below to sign up with Rated People.

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Local house extension experts

What is a house extension?

A house extension is a significant home improvement project that involves adding extra space to your existing property. This can be achieved by extending the structure outwards or upwards, creating additional rooms or expanding existing ones. House extensions can range from small single-room additions to large multi-room projects that completely transform the layout and functionality of your home. Common types of extensions include:

  • Single-Storey Extensions: Ideal for expanding living areas such as kitchens, dining rooms, or living rooms.
  • Double-Storey Extensions: Add multiple rooms and increase overall living space without sacrificing garden area.
  • Loft Conversions: Make the most of unused attic space to create extra bedrooms, offices, or playrooms.
  • Basement Conversions: Convert existing basements into habitable spaces for entertainment, storage, or additional bedrooms.
  • Garage Conversions: Transform your garage into a functional living space, such as a guest room, home office, or gym.

Cost of a house extension

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

The cost of a house extension varies widely based on several factors, including the size and type of extension, the materials used, and the complexity of the project. Here are some general cost estimates to help you plan your budget:

Factors Influencing Costs

  1. Size of the Extension: Larger extensions require more materials and labour, increasing the overall cost.
  2. Type of Extension: Different types of extensions (single-storey, double-storey, loft conversion) have different cost implications.
  3. Materials Used: The choice of materials for walls, flooring, roofing, and finishes can significantly impact the cost.
  4. Location: Costs can vary based on your location, with projects in urban areas typically costing more due to higher labour rates and material costs.
  5. Complexity: The complexity of the design and any structural changes required can increase costs. Unique architectural features, custom fittings, and intricate designs will add to the overall expense.

Average Cost Estimates

  • Single-Storey Extension: £1,200 to £1,800 per square metre.
  • Double-Storey Extension: £1,500 to £2,500 per square metre.
  • Loft Conversion: £1,000 to £2,500 per square metre.
  • Basement Conversion: £2,000 to £3,000 per square metre.
  • Garage Conversion: £5,000 to £20,000, depending on size and specifications.

These estimates include basic construction costs but may not cover additional expenses such as planning permission, architectural fees, and interior finishes.

What kinds of tradespeople do I need for a home extension?

A successful house extension project requires the expertise of various tradespeople. Here are the key professionals you will likely need:

  • Architects and Designers: To create the plans and designs for your extension, ensuring it meets your needs and complies with local regulations.
  • Builders: To handle the construction work, including laying foundations, building walls, and roofing.
  • Electricians: For all electrical installations, including wiring, lighting, and power outlets.
  • Plumbers: To install and connect plumbing systems for kitchens, bathrooms, and any other water-related needs.
  • Carpenters: For structural woodwork, custom fittings, and cabinetry.
  • Plasterers: To finish walls and ceilings, ensuring a smooth, professional look.
  • Painters and Decorators: To add the finishing touches, making your new space aesthetically pleasing.
  • Flooring Fitters: To install flooring that complements the rest of your home.
  • Roofers: If your extension involves roof alterations or new roofing.
  • Surveyors: To assess the site, check the structural integrity, and ensure the project meets all building regulations.
Picture of a brickwork side extension with large windows and skylight

Other house extension FAQs

Do I Need Planning Permission to Extend My House?

In many cases, house extensions require planning permission from your local council. However, some extensions may fall under Permitted Development Rights, which allow for certain types of extensions without the need for formal permission. It’s essential to check with your local planning authority to determine the requirements for your project.

Will an Extension Add a Lot of Value to My Home?

A well-designed and executed extension can significantly increase the value of your home. Extensions that add additional bedrooms, bathrooms, or improve the overall functionality and aesthetics of the property tend to offer the highest return on investment.

How Long Does an Extension Take?

The duration of a house extension project depends on the size and complexity of the work. On average, a single-storey extension might take around 3 to 6 months to complete, while more extensive projects, such as double-storey extensions or loft conversions, can take 6 to 12 months or longer. This timeline includes planning, design, construction, and finishing phases

Sign up as a home extension expert

Sign up with Rated People to connect with high-quality homeowners looking for house extension builders. We do the legwork by providing you with leads, so you only need to quote for jobs that match your skills. With tens of thousands of ads posted every month, there’s always a demand for your services. Plus, with larger jobs like a house extension, we take the time to confirm homeowner budgets and timelines, ensuring your time isn’t wasted. Join today to grow your business with Rated People.

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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 David E on 2/8/2025

The job was posted on 22nd July 2025 and Wade Ellis of Ellis Roofing And Building Ltd responded 2 days later. After a survey, I received a quote on 26th July, which was accepted. A skip arrived on 29th July and the work commenced next day. The job was completed on 1st August. The bricklayer and his female trainee assistant got on with the job without any fuss, and they were very pleasant to deal with. The aim of the project has been delivered and I am very happy with the result. I recommend them. 5 stars!

Welcome to HOME IMPROVEMENT PROJECTS & SERVICES (HIPS HOMES) Ltd, where excellence meets integrity. We offer a wide range of construction services, ensuring quality and efficiency in every project. Discover our outstanding reviews and let us help you make hips of SAVINGS on your budget, add VALUE to your property, and enhance your own and or your tenant's COMFORT. #HipsHomes #HomeImprovement #TrustedBuilders #QualityCraftsmanship

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Reviewed by Farrukh on 10/10/2024

Ernest is a very hardworking tradesman. He replaced locks for us.

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.

My company is Green Wave electrical LTD We do all kind of electrical work , and paint work. We give nice a quick job.

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Reviewed by Roisin on 1/8/2025

I will be using this company again before Christmas ( have a list ! ) . They work long and hard and do a really lovely job at a reasonable price. Looking forward to having them back to help me . Very importantly they were really professional and lovely people . That really helps when you have tradesmen or tradeswomen in your home . I would absolutely recommend this team ! Thanks guys !

hi my names Chris. I am a very handy person with things that needs doing around the house. and I charge very fair prices. We cover most areas from roofing, gardening, plastering, some plumbing, painting, almost anything you need do we have you covered so get intouch for a free quote

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Reviewed by James on 21/2/2025

AA property All aspects building work landscaping Roofing Handy man Garden clearances Jet washing Block paving Flagging Groundwork’s All work under taken

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Reviewed by Mariann on 30/8/2025

Quick and very efficient.

We are a small development company moving into property maintenance to keep our trusted tradesman busy. We can provide trusted, qualified and experienced tradesman to carry out the work required and are contactable 24 hours a day.

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Reviewed by Chris on 18/7/2025

We chose Buildway to do this important work at our house replacing a 42 year old timber balcony. Bill came over and gave us a very thorough assessment of the options and then produced a fair quote for the work. The dates were agreed and stuck to. The job threw up some complications that couldn’t have been foreseen and they were handled professionally by the team. We are very happy with the whole experience and wouldn’t hesitate to use them in the future

A family run local business trading in North wales for over 20 years.We undertake all aspects of home improvements from a simple tap swap to full house refurbishments. Customer satisfaction is our number one goal!

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Reviewed by Adam on 9/8/2024

Didn't clear the weeds and bramble from behind the side gate other than that they did what I ask them to do

Kierda Construction is a family-run building company with more than 30 years in the trade. Although we are based in Hampshire, we also work in Surrey, Sussex and beyond. As well as our extensive experience in building extensions, bathrooms & conservatory roof renovations (lightweight roof) we can also offer: Porches Landscaping Patios Roofing Tiling Bathrooms Kitchens Doors and windows Painting and decorating We pride ourselves on our excellent workmanship and always work to the highest standard, We are very competitively priced. Which is why 90% of our work is recommended. Please call or email us to arrange a no-obligation quote. We look forward to hearing from you.

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Reviewed by Giorgia on 20/3/2025

I couldn't be happier with the service provided by the Kierda Construction. We renovated our porch, toilet and bathroom (completely gutted). Quote was clear. They have completed everything in a timely manner. During the works I wasn't at home, but they kept me updated on everything. Very respectful of the property and high quality work done. Incredible attention to details from the whole team. Absolutely over the moon, I hope to spread the word for them because they truly deserve it!

Five Star Construction is a family run business with the aim to provide affordable handyman and development works. We are full insured and all our operatives are fully trained for the work we carry out. Our friendly team are awaiting your call

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Reviewed by Thomas on 30/4/2024

Good value Very profession Quick and tidy workman Would definitely use them again. Regards Thomas

We specialise in all carpentry and building work Quality finish garinteed with nearly 30 years experience in every aspect of joinery and building work Great customer service means everything to us leaving every job how you expect it to be completed Look forward to providing you with a competitive quote

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Reviewed by Karen on 28/5/2025

Accommodated everything I asked for. He checked that I was happy with certain things before proceeding. Everything was done perfectly. Cleaned up after as well. Will definitely use again.

We provide guarantee quality job with amazing pricing for more then 7 years, Hangloss providing different type of design paintings for same pricing too

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Reviewed by Susan on 4/12/2024

SMART CHOICE ROOFING SERVICES Established over 3 years ago, we provide expert roofing services to commercial and domestic clients across Surrey, Hampshire and West Sussex. A wide variety of services can be carried out to fulfil all your roofing requirements, from new builds to re-roofs, roof repairs and more! Why hire us? 1. All our work meets strict quality and safety standards. 2. Our workforce is subject to continuous training and the company health and safety policy is regularly monitored and updated. 3. We offer emergency call out. 4. We undertake insurance work.

LGL BUILDING SERVICES I have been in the industry for nearly 16 years and specialise in a number of trades including extension,loft conversion, rifurbishmant ,carpentry , landscaping With great attention to detail I aim to provide the highest quality of work. I am a trustworthy and genuine person devoted to my buisness, carrying out work professionally to each individual requirement

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Reviewed by Liz on 28/2/2023

KD Plastering Offers All Aspects Of Plastering & Rendering Services. A Professional Team That Provides A Friendly Service, With Quality Results And Within Your Budget.

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Reviewed by Beth on 19/10/2022

Taylors Building Contractors is your go-to solution for comprehensive property maintenance services. From routine upkeep to emergency repairs, here to ensure your space remains in optimal condition. With a focus on quality, reliability, and customer satisfaction, we take the hassle out of property care.we cover all traditional trades to plastering, carpentry, plumbing, and general building maintenance. Roofing, Brickwork,Fully insured, Credit & Debit cards excepted.

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Reviewed by Richard on 13/11/2024

Steve and team did a fantastic job, fixing a few issues in the house for my tenant. Really good service and communication, and will ask him to do jobs in the future.

I primarily work on all aspects of kitchen and bathroom fitting from fitting to services. However I have a long history of multi-trade work having completed high spec extensions throughout the years, no job is too small. I carry out property maintenance which involve carpentry plumbing and electrics as well as refurbishments all within the latest regulations.

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Reviewed by Sarah on 8/5/2025

I would highly recommend Krzysztof he was professional, good time keeper and took pride in his work very pleased with the finished Bathroom makeover

We cover carpentry, joinery and refurbishments and offer a full range of services, ranging from small projects to major work. Our work is carefully carried out professionally and with great care, also striving to produce the quality you desire.

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Reviewed by Francis on 12/12/2024

Did a great job. Fixed my kitchen cabinets to the plasterboard wall and now they are sturdy. Will definitely recommend Winston’s services.

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 Paul on 21/11/2024

Great job good price

G Greaves carpentry and building services of the complete package from new builds to residential cleaning,we cater for all our clients needs across London and Essex. Carpentry specialists. 17 years experience Fully qualified and certified operatives. All building and maintenance works undertaken. Fully insured. Guaranteed work.

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Reviewed by Bob on 23/3/2025

After an initial very swift reply and quote that was hundreds of pounds less than others there was an initial visit followed by weeks of no contact. After chasing there was another visit and then 3 months of no replying to messages. Suspect he quoted too low but a massive waste of time.

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