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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

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With over 15 years of experience, I am a multi-skilled builder and tradesman known for my precision and high-quality finishes. My expertise spans a wide range of building projects, from residential homes, HMOs, care homes, colleges/offices, small hotels, and airbnb accommodations. I provide these services extremely well: 1. Partitions: I specialise in installing high-quality partitions that are not only functional but also stylish and durable. 2. Bathroom Renovation: I can transform your old and outdated bathroom into a beautiful and modern space. My services cover everything from new tile work, fixtures such as shower trays, to plumbing, custom cabinetry and lighting. 3. Painting: I can give your home or office a fresh new look with a high-quality coat of paint. Whether you prefer traditional or eco-friendly limewash and textured paints, I have the expertise to deliver a cosy and comfortable space. 4. Tiling: I can help you add personality to your kitchen backsplash or update your bathroom with new tiles. 5. Build a New Kitchen: I understand that your kitchen is the heart of your home, and I can help you create a space that is both functional and beautiful. I can take care of all aspects of your kitchen project, including custom cabinetry, countertops, lighting, and flooring. 6. Custom Cabinetry: I can create unique and personalised storage solutions that perfectly optimise your space and style preferences. 7. Extension: I can project manage and build your home extension project, from design to construction. And many more.. My meticulous approach to every project comes from a passion for what I do. I pride myself on being honest, transparent, and providing advice that delivers the best results while ensuring value for money (esp since I am multi skilled, when you hire me, there’s no need for you to hire separate builder, electricians, plumbers, etc since I can do them all). I am also friendly, polite, and respectful of your space. Customer satisfaction is my top priority, and I aim to complete every project on time with outstanding results that surpass expectations. Whether it's light touch-ups or a complete reno, I am committed to providing exceptional service that is second to none. I do my best to keep my rates affordable and I am open to offering special rates for longer-term projects. So, if you are looking for a hardworking professional who will never disappoint, please contact me to discuss your requirements and goals.

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Reviewed by phil on 7/8/2024

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Reviewed by Will on 7/11/2024

Excellent job, will look to re-hire Kem when the need arises.

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Reviewed by Claire on 31/3/2019

Very fast service. Well within my budget.

Hard working dedicated team, building a family run business with a keen eye to detail and professional work. Reliable trustworthy and professional establishing a good word of mouth where most of our work comes from tried and trusted. We can undertake jobs small and large, commercial or residential. Please see our website ask for details We look forward to working together to create your dream Full insurance, CSCS, NPORS machine operator, first aider 15 years experience on big construction sites

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Reviewed by Paz on 24/10/2024

Phil and his team, exceeded our expectations, The professional advice and workmanship was excellent. We had a number of challenges with our garden layout which Phil was able to address, he’s very patient and customer focused. We would highly recommend his services for those looking for a quality and reliable finish. Thx Phil for transforming our garden…

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.

Whether you need a small job done or would like to add an extension to your home, we do it all big or small. We are over 15 years on the market and have hundreds of happy customers. We are committed to customer satisfaction and delivering a superior quality of work each and every time.

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Reviewed by Allen on 11/10/2024

We have only just joined rated people and as yet have not built a profile, but with over 24 years experience in all aspects of joinery and building you can be sure you're property is in safe hands. References from previous clients can be obtained.

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Reviewed by Richard on 29/11/2023

Paul did an excellent job with this sash window. He was punctual and cleaned up afterwards, so no hassle at all. I would certainly recommend.

J4H Civil Engineering Ltd is a trusted company providing a range of property maintenance and home improvements for domestic and industrial customers in Feltham, Middlesex, West London, and the surrounding areas.

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Reviewed by Mark on 12/7/2024

Must give J4H 5 stars. The job they had to do was very difficult with access and the weather but Lee and his team worked tirelessly and transformed our garden from a bog to a place we can entertain guests and enjoy it. Thanks Lee and team

Experience in: Tiling Plastering Painting Laminating Bathrooms Roofing Block paving Brick work Garage conversion Extension Mould Treatment END MORE

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Reviewed by Patti on 18/11/2024

PO Building Services were brilliant ~ they were super efficient. They carried out the work just as I wanted … very professional. Friendly and extremely conscientious. I can highly recommend them great quality of work.

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 Lawrence on 15/11/2024

Winston arrived promptly to repair the bannisters at my house. He carried out the job efficiently and cleared up afterwards. Highly recommended carpenter.

Our building services company RMR Building & Renovation Ltd has over 15 years’ experience in the industry. We have been helping customers in London/Essex and the surrounding 10-mile radius by providing professional, trustworthy building services. We know it can be hard to find a builder that you can rely on. RMR Building & Renovation Ltd has a wealth of experience and is known as one of the best builders in Essex. We pride ourselves on providing a professional, caring and high-quality service and always meet our customers’ needs. Each contractor that works for RMR Building & Renovation Ltd is fully qualified and insured and delivers on timekeeping, quality of work and value. We offer a full range of building services, from major rebuilds to smaller jobs such as masonry repairs, including: New Builds Alterations, Extensions & Conversions Brickwork Concrete Plastering & Screeding Tiling Painting & Decorating Kitchens & Bathrooms Roofing Services Re-pointing Septic Tanks Excavation Services Soakaways Foundations External Works Drainage If you are trying to find a builder near you, why not give us a call? Our friendly, professional team will be happy to talk through your needs and give you a free, no-obligation quote.

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Reviewed by Geethumol on 31/7/2024

Professional, quality work,worth money

Welcome to GRS Building Services, where craftsmanship meets commitment. With a decade of unwavering dedication, we have been providing top-notch construction services across a spectrum of specialties. From robust brickwork and blockwork to seamless extensions, solid substructures, captivating landscaping, and durable fencing – GRS Building Services is your trusted partner for all your construction needs. Our exceptional team is the backbone of our success, ensuring that each project is executed to the highest standards. Whether it's crafting intricate brick details or constructing expansive extensions, our skilled professionals bring precision and expertise to every job. Operating from Chelmsford to Cambridge, we have established ourselves as a reliable and efficient construction partner in the region. Our commitment to excellence is reflected in the quality of our work and the satisfaction of our clients. At GRS Building Services, we understand that your project is not just a construction endeavor; it's a vision brought to life. That's why we take pride in our ability to deliver results that not only meet but exceed your expectations. With a focus on brickwork, blockwork, extensions, substructures, landscaping, and fencing, GRS Building Services is the solution for those seeking a dependable and skilled construction partner.

Established since 2001, I have delivered a variety of building projects efficiently, economically and stress free to very high standard. My services include Space Planning, Design & Build, Site Management (ACIOB). Project Management, Renovations and Refurbishment of both domestic and commercial properties. I pride my self on my ability to deliver the required project to the specified quality within the agreed duration & budget with a courteous and friendly approach throughout.

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Reviewed by Richard on 9/12/2023

Very good, fast efficient and clean, Definitely recommend, Thank you Khal very happy with my new unit.

Property Solutions Ltd Every Roofing Solution At Property Solutions Ltd, we are dedicated to delivering superior roofing solutions. With our wealth of experience, we have become the go-to roofing company for both residential and commercial clients. Our team of skilled professionals takes pride in their craftsmanship, ensuring that every project is completed with precision and attention to detail. From minor repairs to complete roof installations, we use only the highest quality materials to guarantee long-lasting results. Customer satisfaction is at the heart of our business. We strive to provide excellent service, transparent communication, and fair pricing, building strong and trusting relationships with our clients. When you choose Property Solutions Ltd, you can rest assured that your property is in safe hands. Let us protect your investment with reliable and top-notch roofing solutions. Contact us today for all your roofing needs!

We are a family run business and although we are new to rated people we actually have over 25years experience in the building trade! We have many many references already within the area we live and can provide details if requested. There's not much we can't do as a team, we specialise in driveways, fencing, decking & Patios. Drainage, roofing, fascias & soffits, exterior house/building painting, Extremely reliable, trustworthy & great communication and always put 110% in everything we do!

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Reviewed by Peter on 11/10/2024

We are a family owned company, that was established in 2006. We specialise in the fitting of kitchens, bathrooms, bedrooms, Garage conversions, Cladding and so much more.. We have a large portfolio of our work, Our tradesmen are all time-served in the trades and boast the relivent qualifications needed to carry out there tasks. please also feel free to take a look at our Facebook page Marden Carpentry Services for more pictures of the works undertaken.

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Reviewed by James on 24/8/2024

Found James through rated people to do a full kitchen refurbishment. This wasn’t the easiest project, when stripped out their were issues found. But James and other trades he brought in, that carried out the work were very professional and finished the work to a really high standard. Also gave communication and support throughout. 100% recommend and would definitely use James again. Thanks again for work you did, Emily and I couldn’t be happier.

No job is too big or too small for Builder Brothers! With over 15 years of experience in the field our company is confident that we can provide the best service that meets your expectations.

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Reviewed by Munaza on 26/9/2024

Rabbee and his team refurbished my bathroom. Rabbee and his team created a beautiful bathroom worthy of being in a show room as well as repairing the floor below and the bedroom next door. Rabbee was so helpful in helping to pick up items in his van and was patient & understanding with delivery delays. He really cares about customer satisfaction. The whole team is friendly and easy to talk to. Very accommodating to any changes. Have already lined him up for other projects. Finally found a trustworthy team.

GARAGE CONVERSION SPECIALISTS with a vast portfolio and customer base, our company has been established 10 years. Fully insured, all employees and sub contractors cscs trained/qualified. All works completed to a high standard at competitive prices

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Reviewed by Beryl on 4/10/2024

Thank you James, and ? ,sorry not sure of your name, for an excellent job replacing our bath sealant, then replacing broken door knob and fitting new toilet seat. All relatively small jobs but still booked us in swiftly and did an great job for a reasonable price. . Would use again and would highly recommend.

I’m a fully qualified plumber and drainage engineer with over 10 years’ experience in the trade. After completing my plumbing certification, I spent 6 years working as a drainage engineer, specialising in unblocking and repairing drainage systems, using CCTV equipment to identify defects, and providing detailed reports for customers. I’ve also installed UPVC drainage systems and septic tanks, giving me a wealth of experience in both domestic and commercial drainage work. Since 2020, I’ve expanded into the building sector, working on a range of projects including excavating footings, setting out for concrete, installing windows and doors, plasterboarding, and fitting bathrooms. I’ve also been involved in kitchen installations, flooring, and patio laying, with my main focus being plumbing, drainage, and groundworks. My approach is all about customer satisfaction, and I take pride in my attention to detail. I may take my time on certain tasks to make sure they’re completed to the highest standard. You can see my 5-star reviews on my Rated People profile, where I’m proud of the excellent service I consistently deliver.

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Reviewed by Neil on 9/11/2024

Highly recommend! New shower cubicle, panels, and shower. Very happy with our new shower and the quality of the work.

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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