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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

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we repair all roofs all roof we also do all ? building work also damp proofing ?? all work comes fully guaranteed

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Reviewed by Mike on 15/1/2025

Very thorough. Pointed out a few other problems and was very flexible with the price. Friendly and very chatty guy

"I am a skilled multi-trade handyman with several years of experience specialising in both indoor and outdoor carpentry. My expertise encompasses a variety of carpentry techniques, allowing me to handle a wide variety of projects . I take pride in delivering high-quality craftsmanship and ensuring customer satisfaction in every job I undertake."

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Reviewed by Adam on 25/5/2025

Nice guy good job replaced some rotten decking

hi there I'm tracy Mccready from Mccready's property maintenance. I do a good job for a fair price and provide a reliable service in all property maintenance and improvements. we are fully insured for 2 million pound public liability and safety conscious. I offer a free quotation and free advice. I always listen to the customer to find out what they want and need that suits there budget building up good relationships that last for many of years . we are here to help with all your roofing ,building and landscaping needs . we have many satisfied customers who would gladly recommend us to you . we accept most credit cards ,bank transfers or checks. all work comes with a warranty .thank you for taking the time of reading this ,I look forward to hearing from you

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Reviewed by Keith on 12/4/2025

Great service! Quick turnaround, efficient and did a great job to exact requirements.

We specialise in all aspects of hard landscaping such as patios, driveways, fencing, garden walls, sheds, lawns and garden clearance. We also complete aspects of general building such as extensions, porches, interior and exterior painting

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Reviewed by Louise on 24/5/2025

Residential and commercial building contractor specialising in kitchens, bathrooms and full renovations. With over 12 years experience in the building industry our attention to detail is paramount.

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Reviewed by David on 23/7/2024

Very quick, well priced and they did a great job. Thank you

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Reviewed by ian on 16/12/2010

Very happy with the work Mosaic did. They did 2 bathroom makeovers, they were let down by a tile supplier which delayed our timetable but in general the team were good to work with, focussed, and listened to what we wanted. Also very helpful on design, selection of materials, and adjusting for problems discovered when ripping out the old bathrooms. I would be happy to recommend and use them again.

Experienced Builder with over 20 Years experience based at Preston, but also covers the areas of Blackpool, Lancaster, Morecambe, Kendal and The Lake District. We specialise in House Extensions and Garage / Loft Conversions. Full Kitchen & Bathroom design supply and fit service, including tiling and flooring. Full Garden design and landscaping, driveways and patios. No job is too big for us. Ourselves and all our tradesman are fully qualified and insured. If you would like an informal chat about your project, then feel free to contact us.

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Reviewed by Malcolm on 11/9/2021

This rating is for the refurbishment of downstairs cloakroom, ensuite and main bathrooms. This included replacing bathroom suites, new ceilings with light and ventilation fans, full tiling and laminate floors. Probably not the cheapest but the work was completed to a high standard and all tradesmen were pleasant and understood our requirements.

**Italian Job Services LTD - Company Description** **Overview:** Founded in 2021, Italian Job Services LTD is a premier construction company dedicated to delivering high-quality craftsmanship and innovative solutions in the building sector. Based in Crawley,our team is committed to transforming vision into reality while ensuring that every project reflects our core values of excellence, reliability, and integrity. **Mission:** At Italian Job Services LTD, our mission is to provide exceptional construction services that not only meet but exceed our clients' expectations. We strive to build lasting relationships with our clients by understanding their unique needs and delivering tailored solutions that enhance their living and working environments. **Services Offered:** We specialize in a wide range of construction services, including: - **Residential Construction:** Custom homes, renovations, and extensions that embody the beauty and elegance of Italian architecture. - **Commercial Construction:** Comprehensive solutions for office buildings, retail spaces, and industrial projects, ensuring functionality and aesthetic appeal. - **Renovation & Remodeling:** Expert craftsmanship in transforming existing spaces to enhance usability and style while preserving historical significance. - **Project Management:** A holistic approach to managing every aspect of the construction process, ensuring projects are completed on time and within budget. - **Sustainable Building Practices:** Commitment to eco-friendly construction methods and materials, promoting sustainability in every project we undertake. **Why Choose Us?** - **Expert Team:** Our skilled workforce includes experienced architects, engineers, and craftsmen who share a passion for quality and innovation. - **Quality Assurance:** We adhere to the highest industry standards, ensuring that every project is executed with precision and attention to detail. - **Customer-Centric Approach:** We prioritize open communication, collaboration, and transparency, making the client's vision central to our work. - **Local Expertise:** With a deep understanding of regional architectural styles and building regulations, we are well-equipped to navigate the intricacies of Italian construction. **Vision:** Our vision is to be a leader in the construction industry, renowned for our dedication to quality, customer satisfaction, and innovative building practices. We aim to spearhead projects that not only meet contempor

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Reviewed by D on 11/4/2025

Excellent!! Really nice & polite did the job on time and more! I will use them next time! Highly recommended.

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

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

Hi, I’m Luke, the founding member of Sol.Co- Structural outdoor landscaping company. I have been a self employed builder and fully qualifed bricklayer for the last 15 years. Although bricklaying, stonework and paving are my speciality, I do have a really wide skill set. Please see my gallery for examples. I have been fortunate enough to gain building experience all over the world in Australia, Portugal, parts of Asia and the UK. I enjoy working closely with customers and offer a bespoke service for all building needs. Over the last few years I have begun focusing my work towards garden building design. I enjoy working on outdoor spaces as they offer opportunities for creativity without the limitations of planning restrictions. It is also high impact work. A garden can be changed a lot in just the space of a week or two. I appreciate the importance of listening to customers carefully, adding suggestions from previous designs and my own experience as needed. I am happy to put references forward if required. Thanks for taking the time to view my profile.

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Reviewed by Alan on 18/4/2025

Luke is very professional in all stages of the work he carried out. His quote for removing old decking and replacing it with a paved patio was very detailed and reasonable. He kept me informed at every stage of the work. When he finished laying down the patio he left the area clean and tidy. I can honestly say that I am really impressed with the finished job and have no hesitation in recommending Luke of Sol.Co to anyone wanting similar work doing.

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

midland improvements has over 35 years in the home improvement market from a kitchen to a bathroom from a garage conversion to a full renovation whatever your home improvement needs we have the experience and trades to complete the job ,

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Reviewed by Paul on 18/3/2020

Garage conversion into living accommodation, en-suite, and retained small section for storage accessible from both outside and inside. Great work that's stood up to almost 4 years of solid regular use so far.

Davies Building Services is a well established business based in Herne Bay. We service within a 50mile radius of Herne Bay, we provide a wide range of building services including extensions, loft conversions, garage conversions and barn conversions. We provide excellent communication and offer competitive prices, get in touch for a free quotation and we will get back to you quickly.

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Reviewed by Alex on 29/8/2024

Great job, professional to deal with and left job very clean. Would highly recommend.

LITA CONTRACTORS LTD We are a family owned construction company with over 10 years of successful commercial and residential building projects. Based in London, we help clients with all kinds of construction needs, with existing plans or brand-new designs and solutions. Some of our services include: - Ground work - Drainage - Basements - First Fix & Second Fix - Kitchen & Bathroom Fit Out - RC Frame & Steel Frame We are specialised in delivering reliable and best quality services that will last a generation.

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Reviewed by Runa on 3/6/2025

Neil Chamberlain Neil has over 30 years of experience in the construction industry, where he has gained a comprehensive level of knowledge and a thorough and in-depth understanding of most trades and skills. Neil commenced his career in construction as a sub-contractor building loft conversions, primarily in West London, and was awarded by The Federation of Master Builders for an exceptional conversion in Wimbledon. Neils recognised high standard of work has secured many diverse construction projects, including the substantial renovation of Period Houses, including listed buildings, single and double storey extensions, detached new build projects, an award winning Chelsea landscaping and garden design, as well as commercial buildings. Neil has worked as part of a team, as a main contractor and has also project managed all elements required in completing building projects large and small successfully. Property Service, (NPS) is a family owned and run business, bringing an extensive level of ability to benefit our clients projects. Whether you require property maintenance or are planning something more substantial our team will assess your requirements and put in place a tailored package for you, from an appropriately detailed quotation on smaller projects, to an all encompassing design and build service, including - planning, building control and a detailed costed schedule of works, we have the experience and background to meet your requirements.

Electrician at Self employed electrical engineer

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Reviewed by Vicky on 25/8/2024

Came out short notice. Managed to squeeze me in. Due to short notice of getting room plastered 3 days later. Had 4 double plugs put in. In chrome like I wanted. They were professional and cleaned up after themselves. Will definitely use again

Hello, We are BUILD SAFE HOMES LTD Building contractor with 20 years of experience -Extensions -Loft Conversions -Kitchen fitting -Bathroom fitting -Plumbing -Electrical -Tiling -Carpentry -Decoration -Decking -Driveways -Garden offices -Scaffolding -Roofing All works are insured and covered by 12 months warranty. Please shortlist our company and we will be delighted to assist you with your building project! Regards BUILD SAFE LTD

We work off trust and quality of work, along with the best customer service, making sure clients are happy and satisfied at all times. We have a combined total of 25 years experience in the Maintenance and Waste Trade in the Oxfordshire area. Fully insured and licensed up to 10 million for customers and employees. Please do not hesitate to contact us, we look forward to hearing from you.

Hi, we are a group of 3 hard working people who are experienced in gardening and landscaping jobs for more than 5 working years.

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Reviewed by Louise on 2/5/2025

Great Company! Created exactly what was briefed fast and efficiently. Good communication,collaboration, careful and tidy, would thoroughly recommend! -we redesigned our garden to remove old beds and structure, built new curved surround wall and new patio, very happy.

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