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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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We are a friendly family run business of 3 generation's We offer a complete building service with all of our trades men in house. we have completed some major restorations such as Vermont hotel 108 bathrooms county hotel full conversion many extensions and house builds also maintenance for landlords and home owners give us a try and hope to see you soon.

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Reviewed by Alan on 2/5/2025

Excellent. Did the work with no bother. Good price.

Welcome to DB ARK With over 10 years of experience, we specialise in creating bathrooms, bespoke furniture and kitchens that combine style, functionality, and quality craftsmanship. Whether you’re looking for a modern kitchen upgrade or a luxurious bathroom transformation, we deliver tailored solutions to suit your needs and budget. Our services include: •Full bathrooms and kitchen renovations •Custom cabinetry and fittings •Tiling, flooring, and lighting installation •Plumbing work •Wet rooms and walk-in showers •Bespoke furniture •Carpentry work We pride ourselves on delivering high-quality finishes, attention to detail, and excellent customer service. Check out our portfolio and customer reviews to see how we’ve helped clients turn their vision into reality.

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Reviewed by Richard on 27/1/2025

Ruhulla Test

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Reviewed by New on 20/1/2023

Dedicated to our craft. We cover all aspects of building work including: - home extentions - renovations - conversions - plumbing and heating - kitchens - roofing - all general building work

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Reviewed by Mike on 29/4/2022

Gary and his team are very professional and did an excellent job. Gary takes a great pride in his work and does all the preparation necessary to ensure a smooth and efficient job. Had extra work done re rendering, driveway and patio as their work was so good. Would recommend

DT Contractors is a growing business, established over 10 years ago and now run by two brothers. Various skills between both of us and our team. Can complete all sorts of jobs to the highest standard and great quality. No job is too small or too big for us! Just contact us, talk to us and we are sure we can find a way to sort whatever is required. ‘Impossible things - we are sorting staring away! Miracle - give us couple of days!’

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Reviewed by Russell on 19/7/2024

Came and looked at job quoted then didn't answer 3 emails

We pride ourselves with providing a local friendly service. With over 20 years experience in construction covering all aspects We are fully insured , qualified and cover all aspects of carpentry and construction Within our community. Get in contact today for a free estimate, Alternatively. Find us on instagram (Samuels carpentry ).

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Reviewed by nicola on 30/6/2025

Telephoned and made arrangements for next day completion. Communicated well, turned up on time and completed job. Very happy with the service provided. Thank you!

With over 20 years experience in the building industry specialising in extensions , new builds , conversions , and structural alterations we can provide you anything from a small brick wall to a full turnkey project with all certifications We always aim to elevate expectations.

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Reviewed by richard on 3/8/2017

insisted on sealing around conservatory roof with silcone sealant instead of fitting flashing even after repeatedly asking for flashing to be fitted, when roof inevitably leaked would not return to rectify and not returning phone calls/texts

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Reviewed by Dan on 13/5/2025

Quick and professional

Gaudi Construction boasts a 10-year experience and activity in Surrey and South-West London, which has brought the company considerable expertise in Tiling, refurbishment and construction at professional level.

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Reviewed by Amrita on 24/7/2020

Very good service and kept the hallway clean.

Bedfordshire based carpentry and property improvements company . offering carpentry internal and external , as well as having a strong diverse team of different trades operating within the company , all aspects of building work taken on board and a professional job from start to finish .

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Reviewed by carol on 2/7/2025

Aaron works methodically as he lists each job in order of time & space. In doing so, the works are carried out with great care. He moves all furniture himself where necessary. This makes life easier with the relevant homeowner. He is very tidy & clears the areas as much as possible. He is very personable & respectful. Quotations are very reasonable & there is no pressure on potential customers. My recommendations are: I believe Aaron is extremely patient & tustworthy in any situation.

DX Construction ltd is a building company based in sheffield south yorkshire with Experienced and qualified builders With over 11 years experience in the trade we pride ourselves on perfection & 5 STAR quality. We have the skills, knowledge and creativity to solve your site specific problems. References available. Please get in touch for a great reliable and professional service We cover following areas: - Sheffield - Rotherham - Doncaster - Chesterfield - and other surrounding areas SERVICES WE PROVIDE 1 Extension 2 Loft conversions 3 Refurbishments & full house renovation 4 Roofing 5 Chimney removal 6 Landscaping and garden work 7 Carpentry & joinery 8 Kitchen & bathroom fitting 9 Electrical & plumbing   Please get in touch for a great reliable and professional service

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Reviewed by Sarah on 29/11/2022

Andrea and his team were excellent. He is very reliable, efficient and hard working. He made a very challenging job look easy and did some extra things for me that weren’t included in the quote, without charging extra. He got back to me quickly and the whole job took less than 2 weeks from me posting to completion. I would definitely recommend this company and I’m sure I will ask him to do other jobs for me.

Building specialists in the Norfolk area showcasing high quality work with over 10 years experience Qualifications: Level 3 diploma electrotechnical Nvq level 2 bricklaying 10 years roofing & general building experience

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Reviewed by Robert on 12/3/2025

Quick to reply, efficient service, would recommend.

Roman home improvements is a company who pride them selves on high quality workmanship at affordable prices. We have over 20 years experience and cover all aspects of construction. We are here to not only build for your needs but with our experience and knowledge to help design for your needs.

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Reviewed by Phil on 4/11/2024

Prompt response and quote. Options fully explored and explained. Work starts soon.

Hi, We are a small local company with over 35 years of trading behind us in the building industry. Our website has loads of customer reviews, and you can speak with previous clients where we have carried out work, and also visit some of our completed projects. You are guaranteed an excellent service, reliable and trustworthy guidance, and will be totally satisfied with any work which we carry out for you. My aim is to please 100% every time, and you will not be disappointed. Our specialist work currently is garage conversions to habitable rooms. We can also offer remedial advice on condensation and damp issues. We love a challenge! Anything unusual is welcome. You can trust us to work in and around your home. I assure you of my personal attention at all times.

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Reviewed by Jean on 10/9/2022

Dean and his team completed several jobs for me including solar outside lights, putting up blinds, TV on wall, garden mirror., taps dripping and sink leaking, and replacement taps. Great to get all these jobs done at the same. Friendly and professional service. Would recommend Jean Pierce, Hockley

“I am a versatile handyman with expertise in a wide range of home repairs, maintenance tasks, and gardening services. From fencing repairs, build,patio and paving to carpentry and painting, I bring a strong attention to detail and craftsmanship to every project. With my 5 years experience on private jobs,and all the customers been very happy about my services, i am pleased to introduce my self with confidence and enthusiasm! Additionally, I have experience in gardening, including landscaping, plant care, and garden maintenance. I am committed to delivering high-quality work that ensures both your home and outdoor spaces look their best.” I am new on this site,app, and I don’t have any reviews yet, but definitely they will come!

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Reviewed by Ashley on 4/6/2025

I would have no hesitations in recommending Ciprian. He is a genuinely nice and honest tradesman and has very good attention to detail and takes pride and care in what he does. He did an excellent job on my driveway

Newman plastering.  I am a one man band company, with just myself on the tools This means I have no overheads, so I am able to keep the cost down for my clients, but if needs be I can lay my hands on quality plasterers who share the same skill and passion for the job as me. range of services cover: * skimming plastering * Damproofing * External rendering * Dry lining * Internal rendering * Monocouche scratched renders(k rend) Why choose me? * friendly & reliable service * Many years of experience * Pay attention to health & safety * clean & tidy I have more than 10 years experience in all aspects of the plastering trade, and started learning the art of plastering with my uncle . By the time I was ready to leave school I was already becoming handy with the trowel and had some experience behind me, so I went on to do my apprenticeship and work with various other plasterers gaining more experience and learning my trade on housing sites and various  big commercial jobs, as well as doing the odd domestic and private jobs. What makes me different from most companies? Well, I actually enjoy what I do and love plastering, so you can be sure to get a top job. So now you know a bit about me, feel free to use me for your plastering needs.

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Reviewed by Su on 20/3/2025

Neat, tidy and excellent finish in a small rm

17+ years doing plumbing and electrics. City & Guilds • Level 2 NVQ Diploma in Plumbing and Heating: Suitable if you have some relevant knowledge and skills, focusing on domestic hot and cold water systems, central heating systems, sanitation, and gas safety. • Level 2 NVQ Diploma in Installing and Maintaining Domestic Heating Systems: Covers safe working practices, installation and maintenance of hot water systems, drainage systems, and domestic heating systems. • Level 3 NVQ Diplomas: Aimed at those with considerable experience, offering pathways in domestic plumbing and heating, including gas, oil firing, and environmental technologies like solar thermal hot water systems . I am also accredited by these associations. • Chartered Institute of Plumbing & Heating Engineering (CIPHE): CIPHE is a professional body for the UK plumbing and heating industry, aiming to ensure high standards of practice and professionalism. It offers various resources and training opportunities to its members . • Engineering Council: The Engineering Council is the UK regulatory body for the engineering profession, including gas engineering. It oversees the Engineering Accreditation Board (EAB), which accredits academic programs for Chartered Engineer and Incorporated Engineer status. This accreditation process assures the competence, ethics, and professionalism of engineers in the UK and abroad . • APHC Certification Ltd.: Accredited by the United Kingdom Accreditation Service (UKAS), APHC operates several government-authorized plumbing and heating certification schemes. These include the Competent Persons Scheme, which allows businesses to self-certify their compliance with building regulations, and the Microgeneration Certification Scheme, certifying the installation of renewable technologies . These bodies play crucial roles in maintaining high standards within the plumbing and gas engineering sectors, offering pathways for professionals to demonstrate their competence and professionalism. For further details, you may visit the respective websites of CIPHE, the Engineering Council, and APHC.

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Reviewed by Richard on 10/5/2024

Full property maintenance Handy man no job to big Painter & decorator Kitchen fitting r Bathroom fitting Tiles fitted Full house refurb HMO conversion

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Reviewed by David on 10/12/2024

Absolutely 1st class response by Harj & his team to some very challenging works. Cannot recommend highly enough for any domestic or commercial projects. Good value, reliable, always polite & goes the extra mile to deliver the highest quality.

We have over 12 years experience in internal plastering and external rendering. We cover all aspects of plastering including Venetian (polished plaster) and microcement.

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Reviewed by Viktors on 18/11/2024

the worst job ever i have seen i hired anthony as a professional to do some finishing touches on venetian plaster but he didnt do it he took a deposit then he disappeared for three weeks telling stories that he was sick or he didn't have time when he finally came to do the job he did it even worse than before came with one can of filler and made my walls a ugly color arguing that they couldn't be done better didn't return the deposit! i don't recommend it to anyone, do not pay deposit this person

Over 30 years experience in all joinery, paintings and building.

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Reviewed by IAN on 13/4/2025

Professional in his approach. Worked well. Very pleased with the work he did. I would recommend him to others.

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