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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
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
- Size of the Extension: Larger extensions require more materials and labour, increasing the overall cost.
- Type of Extension: Different types of extensions (single-storey, double-storey, loft conversion) have different cost implications.
- Materials Used: The choice of materials for walls, flooring, roofing, and finishes can significantly impact the cost.
- Location: Costs can vary based on your location, with projects in urban areas typically costing more due to higher labour rates and material costs.
- 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.
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
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⭐⭐⭐⭐⭐We are a family based company with years experience we thrive to be the best and trusted roofing and building company in London with or team haveing there training with some of the top schools in London you know for sure your getting the best at a reasonable cost every time with every project .⭐⭐⭐⭐⭐
BILLA BUILDING SOLUTIONS
House Extension
At Billa Building Solutions we have established a business with more than 20 years of experience, every project we take is analysed and performed by our most skilled workers. Billa Building Solutions does undertake work of every size from the little replacement to the big constructing projects: renovations, loft conversions, new buildings, extensions commercial buildings and restaurants. Our company’s aim is to ‘Build the Future and Restore the Past’ by fulfilling our customers’ wish and wants through clear ways of communication, as their satisfaction is our top priority. We do provide our customers with free estimates of the project, and guarantees are included with the finished job.
We have been trading for in excess of 30 years ,15 years as a limited company, we undertake all building works on residential and commercial buildings including planning and project management. We will look at any job regardless of size or location . We offer a friendly service and always listen to your needs Trustworthy and reliable
Whenever you are planning to refurbished your home, our company is the right one to call! We are always ready to offer the style you want to the place you love at the price you can afford.Our experienced team is available to fulfill your vision.
Veselin Hadzhiminev (JVI Infrastructure Eng. Ltd) produced an excellent home renovation project for me which consisted of a garage conversion,single storey rear open-plan 3m extension,extra shower/WC & outbuilding. He was professional, trustworthy,offered great customer service throughout the build, spoke english well,followed up all discussions with email communication & remained flexible to accommodate extra work. His team offered a comprehensive list of services incl. top quality kitchen supply&fitting.
This is my description. It’s awesome.
Rated People did a great job fixing my sink. I would definitely recommend them to anyone seeking a lock or security tradesperson.
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Derbyshire Builders based in Spondon, Derbyshire have been established for 25 years, we specialise in Garage conversions, general building work, as well as kitchen and bathroom installations throughout Derbyshire and Nottinghamshire.
John was very professional, he took great pride in his work. I’m very happy with the job he did for me and would highly recommend.
A professional team of bricklayers and extension shell builders. With over 15 years experience in building extensions and contract bricklaying. An honest approachable firm with full liability insurance for your peace of mind.
Russell did a lovely job replacing my garden wall. He was meticulously thorough and the wall is beautifully finished. I am very pleased with his work and wouldn’t hesitate to recommend him.
CFL Joinery & Construction is led by a fully qualified Level 3 Site Joiner/Carpenter (City & Guilds) with many years of hands-on experience across the construction industry. We combine expert knowledge, precision craftsmanship, and a genuine commitment to delivering high-quality workmanship on every project. Due to continued demand from returning clients and recommendations, we have expanded our services to provide a wider range of building solutions. Alongside professional joinery, we can assist with general construction including electrical installation, plumbing and gas works, bricklaying, and other associated trades, offering clients a reliable one-stop solution for their project. All work is completed to a high professional standard with close attention to detail from start to finish. We aim to offer competitive and transparent pricing and can often improve on previous quotes without compromising on quality. We pride ourselves on being friendly, reliable, and approachable, and we always do our best to accommodate urgent or time-sensitive work wherever possible. For enquiries, advice, or quotations, please get in touch by phone or email. We are always happy to help and discuss your project.
Chris did a great job at fitting the shelf for me and kept me updated with arrival times etc
Tani Dauti Building Services
House Extension
I have over 25 years experience in the building service.
Rated-Trades
House Extension
With over 25 years of experience, we are a fully insured professional building company specialize in all aspects of home improvements, We are a team of hard workers, giving the best at all the time. We pay a great attention to details and we put the quality first. Keeping the work area tidy is a habit for us. Quality and meeting the deadline are very important factors for us when we doing a job. Our goal is to achive customer satisfaction when we doing a job! We offer competitive prices and free quotes
Excellent family run business with father (Marion) who is the main man for the job Reasonable quotes and prompt with phone calls and replies Would highly recommend the team
We specialise in Commercial Groundwork & Residential extensions. This includes: Structural Underpinning, Retaining walls, Trench foundations, metal reinforced concrete walls & floor slabs, Garage and Basement conversions,
Andrew from Eland Construction left us with a very good impression, sadly we had to postpone the job for personal reasons, but he was very knowledgeable and left us a feeling of trust right from the start. He did listened to our needs and understood perfectly well the proyect we had in mind. I will call him again.
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.
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!
Simicus Construction LTD
House Extension
This is Simicus Construction Ltd, we are a team of builders with over 20 years of experience in the Construction Industry.
London City Roofing & Renovations ltd is an established and trusted company with over 20 years experience, offering all aspects of roofing and building services. We are based in Wembley (London) serving all of London and surrounding areas within 100 miles.? We pride ourselves on our punctuality and quality workmanship, offering a prompt and professional service with experienced and expert staff. We guarantee a friendly, clean and tidy service with all work being to the highest standard. We are fully insured and all work is guaranteed. All our tradesmen are experienced and qualified in their respective trades. We specialise in the following: Roofing services: UPVC Fascias & Soffits Cladding Guttering Bargeboards Flat Roofing Chimney Repairs Tile & Slating Work Re-Roofs Lead Work General Building Work Fibre Glass Roofing Double Glazing Building services: Home improvements Kitchen Fitting Bathroom Fitting Extensions Loft Conversions Garage Conversions Bricklaying Plastering Comprehensive driveway and paving service, including: Driveways Drop Kerbs Patios Paths Block Paving Concreting Tarmacing Car Port We offer free quotes
John and the team did an outstanding job. It was easy to work with John and he was very knowledgeable, and provided very sensible advice. Other people quoted work which was over-the-top or wouldn't have solved the problem but John got right to the issue in a no-nonsense way. Quality of the work undertaken was very good, considering the age of the building and complexity. Would recommend.
Innov8 Projects is a forward-thinking construction company dedicated to delivering high-quality, modern, and innovative building solutions. With a focus on craftsmanship, efficiency, and sustainability, we bring visionary projects to life—whether residential, commercial, or bespoke. Our commitment to excellence ensures every build stands the test of time. Building the Future Today
At present, our work is still in its early stages, rectifying 90 years worth of previously bodged jobs. The CBA Team have been excellent so far, they arrive on time, work hard and do things the right way. I will be using them again once this project completes.
Founded in 2004 PMH Construction is now located in Milton Keynes with premises in St Albans, we cover all surrounding areas. We are members of the federation of master builders, specialising in providing a number of building services to both existing properties and new builds. As established builders in Milton Keynes, we pride ourselves on our experience and quality of our workmanship.
Pat and his team have done an excellent job. We are very pleased with the result. There has always been clear communication and timely project management of the build. The team have always been helpful and responsive, with real care of the quality of the work done and attention to detail. Pat has always strived to minimise the impact to us and neighbours whilst the work has been done. We can highly recommend PMH based on our experience.
collins and sons
House Extension
TestAcc
House Extension
QA My Company
GENERAL BUILDING SERVICES We are a Brighton based construction company, which provides comprehensive services in ranges from the modernization, refurbishment and the installation of new facilities.We are working as trading as CONCEPTON look up website.
Very professional work and pleasant to deal with. Pawal always came back to me promptly with up dates and quote.
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