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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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Contact us for a quote (Detailed estimates and surveys are chargeable ) NEW VR DESIGN SERVICE AVAILABLE https://www.rbbrefurbishmentsltd.co.uk Bathroom refurbishment Kitchen refurbishment Howdens kitchen supply and install service Decommission/ fit outs Removal of partition walls Wall panelling Media walls Design & planning Garage conversions Loft conversions Access to architect Access to structural engineer Steel rsj supply and install Full house refurbs Velux and windows supply and install Driveways

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Reviewed by andrew on 26/2/2025

Punctual in getting back to me to offer their services, as of yet I've not picked a company for my project but was impressed with their initial professionalism and conduct.

Alliance building and landscapes Ltd are a family run business here at alliance we make sure all works is completed to customer satisfaction,no job to big or to small,contact us today for a free quote,book once,book right,book alliance

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Reviewed by Raymond on 28/2/2025

Thanks to Michael and the team for a great job rendering the chimney breast in the attic. Quoted and works completed in less than 48hrs. Not the cheapest of the quotes I received, but went with the positive reviews and wasn't disappointed.

I've been working in the maintenance Industry for the past 19 years and i've worked for 6 different councils in London, I've been trading since 2012 with this company.

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Reviewed by Danae on 27/6/2025

I would like to leave a review for Clear Choice and Pierre who completed my job on the 25/6. Pierre was great, friendly and very hard working because there was a bit more in the shed than I thought! Thoroughly recommend Pierre and the company. Thanks!

Here is a description about my company testing 2 updating just testing

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Reviewed by Rated on 29/10/2024

Test without the bad word

Reliable, trusted working in the business since 2000. We work in conjunction with the client to get the best outcome for any job, within the time frame required. That is why we are trusted and recommended by many clients.

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Reviewed by Sam on 13/10/2020

Very good and reliable.

We are a local firm with over 50 years building experience, my son Gareth is a CICS Gold card Carpenter & my oldest son is a City & Guilds advance craft Bricklayer as am I. All of our staff are qualified in their respective trades. We build extensions, carry out house repair & maintenance work, patio and slabbing work, groundwork and excavations, General concreting work, drainage and much more. We fit new kitchens, stairs, doors and windows, all carpentry work undertaken. We have many passed clients who are happy for us to pass on their details as a reference for new clients to use.

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Reviewed by Eamonn on 28/11/2024

Excellent communication and friendly team. On time, great work , on budget. No hesitation in recommending at all.

Our team of skilled professionals is dedicated to delivering outstanding results, whether you need general maintenance, plumbing, TV mounting, painting and decorating, carpentry, furniture assembly, hanging and wall mounting, or floor sanding. No job is too big or too small for our capable hands.

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Reviewed by Adelheid on 15/4/2025

Family business specialising in all aspect of building work full refurbishment and renovations. We bring over 20years of trade experience and pride ourselves on being professional and reliable. We deliver excellent service and high quality workmanship. renovation.

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Reviewed by Rin on 23/6/2024

Rickie did an excellent job painting our small 2 bed house throughout. And finished the job earlier than expected which was a bonus. Would definitely recommend!

CG Building LTD , it is a small company , established back in 2016. We carry work all around UK , but now we are based in Somerset and we cover all surrounding areas. •We take small & big jobs ! •We do all aspects building •We offer a friendly and reliable service, working closely with the client to make sure they have a clear understanding of the works that are being carried out throughout the process.  -Renovations- - Kitchen and bathroom insulations- Plastering. - Painting and decorating. - Carpentry-

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Reviewed by Rickie on 15/3/2023

Very professional. I would definitely recommend this trades person. Good pricing and great work. I am keeping his contract for work in the future.

UWB are a small family run business with over 30 years of experience in the building & window & conservatory industry, our services include extentions & new build plus all aspects of alteration work with all associated trades included. Planing, drawings & Building Regs plus steel calcs are all covered by our team to take the pressure of our customers. Windows, Doors, Conservatories, Orangeries WarmRoofs included & are all covered by building control.

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Reviewed by Vicki on 14/12/2024

Excellent service, very professional, highly recommend

SKG CONSTRUCTION LTD is a family run company with over 20 years of experience in creating high quality loft conversion, Extensions, complete home renovations. We offer a full package from conception through to completion. Our services range from providing you with your architectural drawings, involving buildings regulations and obtaining the necessary planning permissions through to allocating you a construction team and issuing a full guarantee for the completed project. Our loft conversion, Extension architects offer cutting edge design solution and will work closely with you to maximise the space without compromising on quality. They will guide you through the whole process. Catalin will ensure smooth running of the project, being on hand every step of the way making sure projects is delivered on time and most importantly on budget. We’ve perfected the loft conversion, extensions over the years to keep it as simple as possible from start to finish, making sure your aware every step of the way. We offer a 10 years insurance backed guarantee on all major works carries out by SKG CONSTRUCTION LTD all work is fully insured comes with a 10 years workmanship warranty. we carry out all types of building works Loft, Extensions, home renovations, tiling, flooring, plumbing, painting, rendering, brickworks, plastering, carpentry, roofing, steel structural works

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Reviewed by Sean on 16/8/2025

Aquafix Property Maintenance specialise in property extensions, bathroom and kitchen refurbishments

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Reviewed by Sumit on 12/12/2022

Derek is a professional and he came around at short notice to fix my boiler. He gave clear advice and also what he was doing. The repair required multiple visits but he managed to keep me up to date on what he was doing and also the costs were reasonable. I highly recommend him.

Hi, we are a small business based in DONCASTER,and surrounding are. We specialise in bathroom refurbs, disabled level access wet rooms, tiling and plumbing. We offer a very friendly and enjoyable service as we know having work done can be a stressful which is our top priority to make sure this isn't the case. With 10 years’ experience we now have the experience at hand to make sure all work is at the highest standard. We are fully insured for all work we carry out. We always offer a competitive quote for our work and we are very professional at what we do. We pride ourselves in our reputation. We hope our feedback speaks for itself. K&F decorative is one of the Doncaster Property Maintenance Service. We have over 10 years’ experience in property maintenance, working in high end residences, as well as office and retail spaces. It is our aim to provide an outstanding, bespoke customer experience, to leave every customer delighted with the service and the job they have received . Our tradesmen carry out thousands of skilled jobs including: plumbing, handyman, painting and decorating, finding and resolving leaks, dr

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Reviewed by stuart on 31/1/2025

Very punctual and helpful and job done to perfection Many thanks

i have over 20yrs experience in the building trade .have nvq level 2 brickwork qualification also work with various types of building companies to gain more knowledge in the industry ..i am firm believer in letting my work speak for itself.

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Reviewed by Hans on 11/4/2025

Paul repointed a garden wall that was starting to crumble. Excellent work. He was on time, super friendly, and easy to talk to and he did a great job. I was also very happy with the price which was below what others had quoted.

Welcome to custom home improvements and thank you for visiting our rated people page We are a family run business specialising in all roofing work including: Re-roofs Flat roofs Slate Tiling Roof moss removed Chimneys Ridge & Hip tiles Lead work and Valleys Upvc fascia, soffits and guttering - cleaned, repaired and renewed. EPDM Rubber roofs. We give free estimates and all work is guaranteed so don’t hesitate and give us a call

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Reviewed by Kyle on 27/8/2025

With an esteemed 15-year tenure in construction, I offer a comprehensive suite of services tailored to elevate your residential spaces to unprecedented levels of sophistication and functionality. Specializing in block paving, loft conversions, spotlights, and painting and decorating, I blend technical prowess with creative vision to bring your ideas to life. From meticulously executed projects to innovative design concepts, trust in my commitment to excellence, professionalism, and client satisfaction to exceed your expectations at every turn. Experience the assurance of quality and the promise of transformative excellence as you embark on your journey with me, your trusted partner in crafting spaces that epitomize luxury, comfort, and timeless elegance. We specialise in- -drive way/patio installs and or jet wash & reseal -interior decorations -plumbing works -hard flooring -loft conversions. And a range of other things.

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Reviewed by chris on 4/6/2025

The guys were great,did what was required,all done in a day. Thumbs-up all round

Elevate your home's style and value with our exceptional Painting and Decorating services. • Expert color consultation and design • Fast, efficient, and meticulous workmanship • Personalized service to fit your unique needs • High-quality paints, materials, and finishes • Flexible scheduling to fit your timeline Whether you're preparing to sell, refreshing a tired space, or creating your dream interior, our premium Painting and Decorating services will elevate your living experience and increase the value of your property. Invest in your home and enjoy the benefits of a beautifully updated space that reflects your unique style. Our meticulous attention to detail and commitment to quality ensures a flawless finish that will have a lasting impact. Let us handle the hard work so you can sit back, relax, and enjoy your transformed living space.

Ruhulla Test

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Reviewed by New on 20/1/2023

we are experience refurbishment contractors. we are reputable and reliable builders, established since 2010 and over 20years experience in building trade. using our skill and materials, we are eager to ensure that our customers are completely satisfied.

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Reviewed by Vinoth on 5/3/2025

Did not received the quote / response after sent the details.

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