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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 are glad to present All 4 You Contractors Ltd company which is dealing with provision of redecorating and building services. Our best asset is our comprehensive way of working. Due to being well established company in the market with vast experience we guarantee high quality and aesthetic results. We've got many years of experience in UK, Germany and Poland. Our work is guaranteed and we have a reputation for reliability and fair prices. All 4 You Contractors Ltd are fully insured, trained, competent and offer a high level of professionalism. We will give you attention, positive attitude and the best possible customer service available each and every day. All 4 You Contractors we provide staff services in: Painter/Decorator, Plasterer, Carpenter, Tiler, Multi Trader. All 4 You Contractors we are trying to be a professional company so, we provide training for our employees.

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Reviewed by Andy on 22/9/2023

Good job!

R&D CONSTRUCTION IS A PROFESSIONAL DESIGN AND BUILDING COMPANY SPECIALISING IN ARCHITECTURAL DESIGN AND PROJECT MANAGEMENT FOR RESIDENTIAL AND COMMERCIAL PROPERTIES, ALSO A WIDE RANGE OF CONSTRUCTION, DEVELOPMENTS AND REFURBISHMENTS. We Carry out all type of construction and to us no job is a small job and by that we mean we would be happy to take your various jobs in our hands. We provide the following list of the building services: New Build Property Refurbishment Loft Conversion House Extensions Flat Conversion Driveway & Patio Bricklaying & Re-pointing Kitchen & Bathroom Roofing & Guttering Plastering & Tiling Carpentry & Joinery Painting & Decorating Plumbing & Electrical Central Heating & Under Floor Heating Design We believe a great design is simple and not only how it feels or looks but also how it works. We provide Architectural and Interior Design and Engineering Services: Initial Concept Design Basic Drawings for Planning Application & Application Management Existing & Proposed Floor Plans, Elevations and Sections Site Plans and Block Plans (OS map/ Location Plan) Detailed Architectural Design 3D Concept and Visualisation Design Interior Furnishing, Materials & Fabrics Lighting Design Bills of Quantities (BOQ) 3D Interior Visualisation Design 3D Interior Visualisation Design Building Control package Drawings & Application Management

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Reviewed by Cathy on 22/1/2025

Mo came out the following day and did an excellent job at a very reasonable price.

With over 30 years’ experience in the construction industry, we know how to deliver work that looks good and lasts. We work on properties of all shapes and sizes, commercial and domestic, turning your dreams into a reality.

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Reviewed by Sohail on 15/12/2021

What an amazing guy!, another 2 weeks and he would have become a member of our family!. You can set your clock with George, he was at our door an 8am on the dot every morning. He gave us so many different ideas which really helped us. His workmanship i, totally flawless. We know what quality looks like now. George is a loyal, honest and hardworking individual who will always be our first choice when getting work done.

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

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

A&K CONTRACTOR ARE SPECIALISTS IN ALL TYPES OF BATHROOMS AND HOUSE REFURBISHMENTS. WE PRIDE OURSELVES IN HANDLING EVERY PROJECT OURSELVES .IT GIVES CUSTOMERS PEACE OF MIND TO KNOW THEY CAN TALK TO US AT ANY TIME ABOUT HOW THEIR PROJECT IS PROCEEDING. OUR ATTENTION IS FOCUSED ON DELIVERING A FRIENDLY SERVICE WITH HIGH QUALITY WORK FOR EVERY CUSTOMER ,WHILE AT THE SAME TIME OFFERING GOOD VALUE FOR MONEY. OUR ETHOS IS; -PROFESSIONAL PREPARATION -MAINTAINING AND CLEAN AND TIDY ENVIROMENT -HIGH STANDARD FINISH -POLITE AND PUNCTUAL -REALIABILITY -GREAT VALUE FOR MONEY.

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Reviewed by jennifer on 14/4/2025

Christian is very argumentative, he does not listen to what the customer wanrmts, he looks for the easiest and cheapest material to do the job, he tells you not to tell his workmen how much he has charged you or he will quit the job.he is an extortionist, he overcharges for material, if you buy your own material, he takes what remaining without asking, he is always in a rush and as a result the job is not completed, you have to hire someone else to complete it. For peace of mind, I won't hire him

Professional Floor Fitter & Timber Frame Specialist I am a skilled professional with extensive experience in floor fitting and timber frame construction. Floor Fitting I specialise in installing various types of flooring, including: • Luxury Vinyl Tiles (LVT) • Engineered wood flooring • Solid wood flooring • Laminate flooring • Ceramic tiles • Skirting boards I also provide all necessary floor preparation, such as: • Damp-proof membrane (DPM) installation • Levelling subfloors • Plyboarding • Fitting new chipboards • Installing insulation between joists on ground floors • Levelling concrete floors using high-quality materials like latex or water-based screed Timber Frame Construction In addition to flooring, I have expertise in timber frame construction, including: • Home extensions • Sheds • Other timber-based structures I offer professional technical support and advice to ensure high-quality workmanship for every project.

Very honest , transparent, and polite team , providing a service from concept design to finished product Unfortunately last job was unfinished due to an accident in filey in where I drowned trying to rescue someone in the sea Tragic failed rescue has miraculous happy ending , on youtube I suffered memory loss and severe problems after this and after working for another firm for short while I am ready to start again on my own so please take this into consideration with my last review

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Reviewed by Torsten on 30/10/2022

Unfortunately, over 12 months into the project, it is still not finished. There were a few circumstances outside of Tom's influence, but the delay's have been accompanied by repeated lies about finalising the project, and poor quality of the work that has been done.

Eagle eye building LTD in an established, family run business with a wealth of knowledge & experience. Taking pride & care of all of your building needs. We cover all aspects of building and no job is too big or small. For more information, or a free quote, please feel free to get in touch with us.

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Reviewed by Stephen on 22/11/2023

Great customer care and excellent standard of work. Delighted, thanks

My self and my workers have a nice way of working with clients we’re friendly polite and very clean and respectful of other people homes as we too have lovely homes . We work hard to keep clients happy and resolve problems that come there way through building projects. We also can show many recommendations from our own neighbours to people we have never met . Many thanks mark

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Reviewed by Megan on 4/4/2024

Mark was very responsive and really helpful and informative when providing a quote for some underpinning and structural repair work. Would definitely recommend.

We are a family run business with experience in all aspects of Building, roofing & home improvements. working around Newport and the surrounding area's. We provide a fast and professional service at competitive rates. No job too small, call now for a free quotation. newporthomeimprovmentscom

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Reviewed by helen on 23/8/2024

Luke was incredibly fast and fitted a new tap in our kitchen. A very professional job. I would recommend him to everyone.

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.

We are an established company providing building, plumbing, joinery and fitting services at reasonable prices. We are an established company providing building, plumbing, joinery and fitting services at reasonable prices. Over the years, we have built a reputation for quality craftsmanship, creativity and efficient customer service. Whether you need building extensions, renovations, plumbing, heating, kitchen & bathroom fitting or maintenance, our team members will be happy to help. Get in touch with us for services in Halifax, West Yorkshire. Our builders have a great wealth of knowledge and experience in the construction industry. Even before we start on your project, we will sit down with you to understand exactly what you are looking to change. We will turn your ideas into our designs to create your dream home. If you need more information about our services, talk to our experts today. We can even work around your schedule to ensure minimal disruption to your daily routine. All of our staff are highly aware of the COVID situation. We always use face masks for your protection and sanitise at all possible opportunity, keeping both us, you and your property safe. Reputable construction company Very competitive prices Experienced team of builders Serve across West Yorkshire Completely dedicated staff and Free estimates and professional advice.

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Reviewed by James on 13/1/2025

Really satisfied was here on time, and the job was finished to a high standard

We have just been asked to join Rated People ,so our ratings do not exist yet. However with over 30 years experience and countless jobs under our belt, we can do anything from fixing a broken tile to complete refurbishments and extensions. New drains to a new roof we can do it all, and do it well. Kitchens, bathrooms, alterations redecoration, all in a day's work for us. An Island family firm ,with excellent references and recommendations . We are recomended by estate agents and property management services. Friendly reliable service at realistic prices. We finish on time on price. For a builder you can trust, call us.

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Reviewed by Tony on 12/7/2023

didn't even turn up waste of time if you don't want the job just say so its best all round.

*Professional Summary:* After obtaining a degree and purchasing my first home, I quickly realised that I had a knack for DIY and home improvement. This passion led me to retrain in various trades, where I honed my skills and developed a deep understanding of the construction industry. Leveraging my hands-on experience, I transitioned into project management, where I now hold significant qualifications. Today, I use my expertise to bridge gaps in projects as I work towards securing larger industrial contracts. My journey from DIY enthusiast to skilled PM has equipped me with a unique blend of technical and managerial skills, allowing me to excel in both the planning and execution of complex projects. *Business Philosophy:* At our company, we believe in valuing the skills and dedication of our tradesmen. Each team member not only earns a competitive wage but also benefits from a share of the company's profits at the end of the calendar year. This approach ensures that our workforce is motivated to deliver exceptional quality on every project. We don't work cheap; instead, we focus on delivering precisely what we promise, ensuring that our clients receive top-tier results and our tradesmen are rewarded for their hard work and craftsmanship. *Commitment to Quality and Safety:* We take our responsibilities seriously. Our company is fully insured, and our team is highly competent, holding a Safety Schemes in Procurement (SSIP) certification. We are committed to upholding the highest standards of safety and professionalism in every project we undertake. This commitment reflects our dedication to delivering not just quality work, but also a secure and compliant working environment for all involved. Our company operates on the principle that in any project, you can have it good, fast, and cheap—but only two at a time. This philosophy guides our approach to delivering quality work while managing client expectations. If you want something done quickly and to a high standard, it won’t be cheap because quality and speed require skilled labor and premium materials. Alternatively, if you need something done quickly and on a budget, you might have to compromise on the level of quality. Lastly, if quality and cost are your priorities, the project will take time, as we won’t cut corners to rush the job. This principle ensures that we remain transparent with our clients. NOW LETS GET TO WORK!

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Reviewed by Lynn on 7/10/2024

The service was good as the trader responded immediately however did not use him as he took long to respond

Landscaping, Garden designs,resin drives, block paving, patio designs.extensions,home renovation. living walls and much more. we always make sure our clients are 100% happy with quality of our work, and best possible prices.

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Reviewed by Nick on 12/6/2024

Superb job. Nice people all round. Defrim, Al and Mel - the three musketeers who made the magic happen. When asked they did. Very happy with result, thoroughly recommend. Hope my back will get the same treatment some time - after I win the lottery !

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.

WHO WE ARE Viv Construct Group provide a variety of professional groundwork services. We carry out all forms of groundworks construction: underpinning, reinforcing concrete, Driveway Tarmacing, Road Forming, Pavement Tarmacking, Concrete Driveways, Concrete Pavements, Garden Maintenance, Front Patios, Garden Patios, Swimming Pool Slab Laying, Driveway Slab Laying, Drainage, Ducting, Landscaping, Footpath Resin Bound, Drop Kerb and more. What sets us apart is our unwavering commitment to professionalism and efficiency. Our highly skilled team utilises the latest equipment and follows industry best practices to ensure that every project is completed to the highest standards. We prioritise safety at every step, adhering to all regulations and guidelines to create a secure working environment for our team and clients alike. Check out our site https://vivconstruct.com We are one of the leading groundwork Cambridge based and have decades of experience working with the wide variety of buildings that are found in Cambridgeshire. We work with: buildings of different ages, different types of buildings with different forms of construction, and all shapes and sizes, as you would expect in a historical city like Cambridge. We provide a variety of professional services from getting the ground ready for new construction work to repairing and reinforcing existing buildings. We carry out all forms of groundworks construction: underpinning, reinforcing concrete, Driveway Tarmacing, Road Forming, Pavement Tarmacking, Concrete Driveways, Concrete Pavements, Garden Maintenance, Front Patios, Garden Patios, Swimming Pool Slab Laying, Driveway Slab Laying, Drainage, Ducting, Landscaping, Footpath Resin Bound, Drop Kerb and more. We want to give our best at all times so we are assessing our work and looking for any improvements that can be made.

With over 20 years of experience serving South London, Great Lofts specializes in high-quality loft conversions and home extensions. Our skilled team is committed to transforming your space with innovative design and expert craftsmanship, ensuring your project enhances both your home’s functionality and value. • Loft Conversions & Extensions: Tailored to your needs and vision. • On Time & On Budget: We take pride in delivering every project with precision, on schedule, and within the agreed budget. • Local Expertise: Over two decades of working in South London, with a deep understanding of the area’s unique architectural needs. Let us help you make the most of your home. Contact Great Lofts today for a free consultation and start your journey to a bigger, better living space.

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