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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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Stuart has been in the Building industry for 25 years and cover a broad spectrum of building works services ranging from :- plastering *decorating *bespoke bathrooms,laminate flooring and kitchens and plumbing.Fully insured (certificate on request)

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Reviewed by Phil on 1/3/2025

Stuart is a great communicator and gave some good advice. He did a great job and completed the work on time. I will definitely use him again.

Hello we are FRPM Ltd a compete property maintenance company with over 20 years experience so if it’s a leaking tap to a complete property renovation we are here to help so please do not hesitate to call for your free quote Areas we cover Worcestershire Gloucestershire Warwickshire And the Cotswolds We have years of experience working with listed buildings and pride ourselves and our level of knowledge and expertise in this area We also cover light commercial premises for maintenance contracts and adhoc works We are fully insured

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Reviewed by Madeleine on 16/4/2025

We are a building company that have been in operation for over 25 years We are mostly architect or customer recommendations based We can organise a local architect to produce your plans or price plans you already have We are a little old school where we will give you a competitive estimate and then show you the works we are doing also a job we have finished recently

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Reviewed by Manny on 16/4/2025

Excellent guys, no fuss and got the job done quick and to an excellent level of quality! Highly recommend!

With more than 20 years of experience in the home maintenance business, we can help you. We are a team of professionals, fully insured and qualified, Providing Handyman services to North Londoners. We're passionate about helping North Londoners: fit & hang pictures & mirrors fit & hang shelves fit & hang curtain pole & blinds fit & hang flat screen TV's fit & hang skirting and architrave fit & hang garden gates, interior doors, locks, handles and catches We're excited to help North Londoners: assemble flat pack furniture, wardrobes, sofa and beds dismantle and relocate furniture We love to help North Londoners with household repairs and maintenance, painting and decorating.

We are a small family run company that cover all aspects of the building trade, with over 40 years experience. A member of the FEDERATION OF MASTER BUILDERS so our work is monitored and trusted. Our range of work ranges from repointing a wall to newbuid.we have a great team and cater for all aspects of building,renovating and repairing, giving your home the loving care it deserves. TRUSTMARK APPROVED FOR GREEN HOMES GRANT

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Reviewed by Tony on 18/1/2024

You can see why Smith & Son get a good rating. You get a friendly builder that does a good job. We employed him to fit a steel beam and a door lintel. The site was tidied up on completion and advice was given about covering the beam and contacting building control. Thanks Ian and team, great job, thoroughly recommended.

We are a family business, specialising in home extensions and one off new build Bungalows and houses since 1974. We offer a design and build service, looking after Planning permission and building regs drawings for you. Many local references available.

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Reviewed by david on 29/4/2021

Steve ward provided us with an outstanding finished product including a 15sq meter rear extension with fitted kitchen cloakroom & utility. he also drew up the plans , his quote was very reasonable and it came in on budget. Steves team of Ryan Graham Paddy & Dave were a pleasure to deal with and the workmanship was of the highest standard. They were considerate at all times and were very clean workers. My wife said they helped here get through lockdown. absolutely no hesitation in reccommending them.

From a single wall to a complete house, inside and out, plastering/rendering. Also roofing, stonewalling, extensions and general maintenance....no job too small. Please feel free to email me or leave me a message and I'll get back to you.

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Reviewed by Geoffrey on 11/7/2024

Reliable, personable, conscientious, trustworthy and reasonably priced. Can definitely recommend .

Welcome to Levelin Group – your trusted experts in bathroom and kitchen design, supply, and installation, with over 15 years of experience. We specialize in complete bathroom renovations, bespoke kitchen installations, and tailored 3D CAD designs to bring your vision to life. Our comprehensive services include bathroom fittings, custom kitchen cabinetry, plumbing, tiling, and flooring– all completed to the highest standards. Whether you’re planning a luxury bathroom transformation or a stylish, functional kitchen upgrade, we’re here to deliver precision, quality, and care. Contact us today for a free, no-obligation quote – let us transform your space into something extraordinary!

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Reviewed by MICHAEL on 16/11/2022

I did not hire this company. They came to assess the job and promised to send me an estimate by email. However, despite several messages to them from myself, they never had the courtesy to respond or send me a job estimate. I would have zero confidence in this company, and obviously their customer relations needs improvement. Consequently, I am still seeking a tradesman to do the job.

Nathan and Tyler specialize in comprehensive building renovations and offer a wide range of services covering all aspects of construction. With their expertise, they are skilled in tackling various projects, from small-scale renovations to complete building overhauls. Their services encompass every stage of construction, including planning, design, demolition, carpentry, plumbing, electrical work, and finishing touches. Nathan and Tyler's commitment to delivering high-quality results ensures that they are well-equipped to handle any building work, providing clients with reliable and professional solutions for all their renovation needs.

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Reviewed by Patrick on 19/4/2025

A very efficiently done job. Worked tidily and to a good standard.

Welcome to Okaeri Need a new kitchen or bathroom designed, supplied and fitted? We are your one-stop shop for everything Kitchen, bathrooms, wet rooms, en-suite bathrooms, shower rooms and disabled bathrooms. We guarantee to beat any genuine quote. We offer a FREE design consultation where we discuss your bathroom needs in the comfort of your own home. Here we design your perfect luxury space based on your likes and dislikes and work out costs based on your personal budget. We use our CAD design program to create that perfect space that you require. This will help you visualise your new bespoke kitchen or bathroom before it's built?. We supply the materials and accessories based on the design. We take care of all deliveries and logistics, so everything is in place exactly where it should be and ready for each of the stages of the installation. We handle everything regarding the full installation of your new kitchen or bathroom including all the trades necessary to complete your project and any remedial building works.? Plus you have the guarantees and peace of mind that the whole installation is being project managed by us from start to completion. Our one-stop shop kitchen & bathroom installation services are very often selected above others in South Yorkshire because of our great aftercare attention, and customer service values, and that fine attention to detail that's an element most of all missing in today's society. We offer quality tradesmen, fantastic products at great prices and a project management program that brings it all together, it doesn't get much simpler than this! Choose Okaeri for your next kitchen or bathroom.

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Reviewed by Ben on 18/1/2025

Gareth did a fantastic job bathroom looks great , left no mess and was very polite

Welcome to Cerberus Constructions Ltd – Building Excellence, Together At Cerberus Constructions Ltd, we bring visions to life with precision, passion, and a commitment to quality. As a trusted partner in construction and development, we specialize in creating spaces that inspire, endure, and exceed expectations. Why Choose Us? • Expert Craftsmanship: Our skilled team delivers impeccable results, whether it’s residential, commercial, or industrial projects. • Innovative Solutions: We embrace cutting-edge techniques and sustainable practices to shape the future of construction. • Tailored to You: Every project is as unique as our clients. We work closely with you to understand your needs and turn your ideas into reality. • Reliable and Transparent: With on-time delivery and clear pricing, we ensure every project stays on track and within budget. Our Services • New Builds & Extensions: From the ground up, we create homes and businesses designed to impress. • Renovations, Bathrooms & Refurbishments: Transform your existing space with modern, functional, and elegant upgrades, including stunning bathroom makeovers that combine luxury and practicality. • Specialized Projects: Custom construction solutions, including kitchens, plumbing, and boiler installations, delivered with unmatched expertise. Our Promise to You All our projects come with a 5-Year Workmanship Guarantee, ensuring peace of mind and long-lasting results. A Sustainable Future At Cerberus Constructions Ltd, we prioritize environmentally friendly methods and materials to reduce your carbon footprint without compromising on quality. See Our Work Explore our portfolio and see how we’ve transformed spaces across Manchester and beyond. From breathtaking bathroom renovations to stunning home extensions, our gallery showcases the results of our dedication and skill. About Us Founded on a passion for craftsmanship and customer satisfaction, Cerberus Constructions Ltd has been serving the Manchester community with dedication and expertise for over 10 years. Our mission is to build not just structures but lasting relationships with our clients. Your Project. Our Priority. We pride ourselves on transparency, reliability, and exceptional results. From initial consultation to project completion, we keep you informed and involved every step of the way. Let’s Build Something Extraordinary. Contact us today to discuss your project and request a free quote.

WEBITE LINK : https://hawksworthandsans.co.uk Welcome to HAWKSWORTH&SANS ROOFING AND BUILDING , where we build dreams into reality. With a foundation rooted in expertise and dedication, we specialize in crafting exceptional spaces tailored to your needs. From concept to completion, we're committed to delivering innovative design, quality craftsmanship, and unparalleled customer satisfaction. Let's build something extraordinary together

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Reviewed by Shannon on 17/1/2025

We had our porch done by Lab Development. I’ve always wanted the extra space. Thanks again for putting in the hard work and ensuring high quality. Adam and Louis explained what would be done, and they did a really great job. There were a few hiccups during the job, such as some of their colleagues being off sick and a delayed finish, but we were in no rush for the job to be completed. Adam always communicated with me for updates. It was tidied and cleaned after everything was finished. I highly recommend.

"Here at AAR plastering & building services we have a wealth of knowledge throughout all the plastering and building sector, please get in touch for your free no obligation quotation today"

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Reviewed by John on 23/3/2025

Bathroom ceiling painted, Alan did a great job with the best quality materials. He is very trustworthy and friendly. I would highly recommend and will be putting more work his way in the near future.

Gabrica Ltd is a leading construction company renowned for its commitment to excellence, innovation, and client satisfaction. With a proven track record of delivering superior quality projects across residential, commercial, and industrial sectors, Gabrica Ltd stands out for its meticulous attention to detail, stringent adherence to timelines, and unwavering dedication to customer service. Equipped with a team of highly skilled professionals and state-of-the-art technology, Gabrica Ltd excels in every aspect of the construction process, from initial planning and design to construction management and final delivery. Committed to sustainability and environmental responsibility, Gabrica Ltd integrates eco-friendly practices into its projects, ensuring a lasting impact on the communities it serves. With Gabrica Ltd, clients can trust in a partner that consistently surpasses expectations, delivering exceptional results that stand the test of time.

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Reviewed by Joe on 27/5/2025

Brilliant. Efficient, hard working, friendly, professional, good vale and quality work. I'm very pleased and will use again.

I'm a fully qualified builder & plasterer working on old and new properties. We specialise in Garage Conversions start to finish. New UPVC Conservatories. Single Extensions. Full Renovations. Building Alterations. All building work. All plastering work. - Artex ceilings covered. Plaster-boarding. Skimming. Patching. Building alterations. - Knock-throughs. Lintel installs. Stud walls. Repointing. Refurbishments. Conservatories. - Start to finish. Extensions. - Start to finish to current building regulations. No job too big or small. Always work in the cleanest safest way possible. Top quality assured. Fully insured/public liability. Free quotes and advice.

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Reviewed by Avala on 13/1/2025

I hired Tom trading as Plaster Master to repair bedroom ceiling and board the loft and install loft ladder and replace the loft hatch. He gave an honest estimate for the work and the time line needed to complete the project which he did on time. I won't hesitate to use his services again.He was extremely reliable and professional arrived at the time he said and he tidied up at the end of each day’s work. I thoroughly recommend him! A job extremely well done.Definitely a 5 star review

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

Lambarde is located in the Sidcup area and covers most of the South east, we have a combined experience of 62 years, I started carpentry and building work as soon as I left school then going to college for two years becoming a fully qualified carpenter with Levels 1,2, NVQ Diploma. All of our team carry public liability insurance, so you’re in safe hands. We also work alongside other fully qualified trustworthy tradesman for our refurbishment works. We pride ourselves on: • Workmanship • Time keeping • Honest communication Portfolio on Instagram: Lambarde_ We specialize in: • extensions •.Loft conversions • Kitchens • Internal and external doors • Skirting and architrave • garden room/man caves • wall panelling • Roofs cut/pitched • Decking • Flooring laminate/herringbone • Ironmongery • Cladding • Refurbishments • Painting and decorating Free quote available

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Reviewed by Mark on 7/1/2023

Scott and his team did a fantastic job with our loft conversion. He was approachable, honest and friendly throughout. But most of all an excellent carpenter who did a first rate job with our loft and also dealt with our many requests and amendments with patience and professionalism. I have recommended Scott to friends and neighbours already and would recommend him for any work you are doing.

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Reviewed by Claire on 27/3/2025

Kem did a fantastic job at a very reasonable price. I would definitely use him again and would highly recommend him!

We are a family run buisness that originated in Lincolnshire. We have relocated to the Kent area and have a fantastic skilled team of builders, carpenters, electricians, landscapers and many more. We thrive on perfection, quality and value for money and will share our knowledge and expertise with you.

Martons Building Contractors is a trusted name in construction, known for our problem-solving skills, attention to detail, and innovative designs. Our mission is simple: to exceed the expectations of every client we serve. We offer a range of services including conversions, extensions, groundworks, new builds, and roofing. With a combined experience of over 100 years, our team of 5-6 professionals ensures that every project is executed with precision. While our core team is small, we have a network of reliable subcontractors for electrical and plumbing work. Based in Leeds, North Yorkshire, and Lancaster, we are dedicated to serving these areas with quality construction services. Choose Martons Building Contractors for reliable craftsmanship and a commitment to excellence in every project. All contracting works available and covered in and around Yorkshire.

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