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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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HEX360 was founded in 2015 by Craig Lewis with the solid foundation that a degree in construction management provides. Before launching HEX360, Craig’s former life saw him working at Princess Yachts, where he founded his skills and acquired his particular attention to detail – but if you’ve reached this page, you probably aren’t interested in hearing Craig’s life story… you’re really interested in finding out what makes HEX360 different to all the other construction companies out there. So read on and discover our difference. Working with most construction companies can feel a bit like finding your way in the dark – you just don’t know where to go to get the information you need. The stereotypical construction company that makes matters so confusing and complicated that everything they say goes over your head is, unfortunately, not just a myth. They’re out there, and they’re confusing clients as we speak. So, it’s no wonder that so many people put off their project or come to a grinding halt partway through – after all, it can all feel just too overwhelming. Luckily, HEX360 is here to change your perceptions and prove that not all construction companies are the same. We’re dedicated to working with you, not for you, and that means taking a collaborative approach right from the get-go. With our 8-step process, we’ll clearly outline every stage of your project so you won’t feel overwhelmed, and thanks to our use of in-house project management software, you’ll have complete transparency for every aspect of your project. We are committed to flexibility, accessibility, and approachability so your project can run smoothly, whether you’re updating your kitchen, renovating or extending your entire home or developing a large commercial property. You’re more than a number on a spreadsheet to us, and we never bite off more than we can chew. Our attention and efforts are solely dedicated towards you and your project during your time with us. Unlike with some construction companies, once we begin work on your project we don’t simply move on to our next. We provide industry leading account management during the full life cycle of the project, meaning you aren’t forgotten about once you sign on the dotted line.

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Reviewed by terrry on 11/4/2017

i would like to add this group of workmen are the best i have seen for a long time.they are prepared to go above and beyond to ensure a professional and efficient project is completed. Above all they are honest ,trustworthy and obliging in every way. Highly recommended.

25 years experience as a builder and over 15 years running my own business I specialise in property renovation, loft conversion, bathrooms and kitchens fitting Cooperating with and architect, fully qualified electrician and Gas Safety plumber All job insured

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Reviewed by mark on 30/9/2024

Andrew and his team did a great job with our refurb. His quote was very competitive and he was easy to communicate with. Very happy with the finish. Would definitely recommend him and use his team again for any other work in the future.

We don't say we are the best our customers do. If you need reliable roofing team to get your job sorted we are the people for the job over 20 years experience in roofing and light building don't delay call today and we will be happy help

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Reviewed by Brian on 24/12/2021

Quick response and services

LOOK FORWARD TO MORE LIVING SPACE Do you or your family need more space? Maybe a house extension to provide a dining room or a new kitchen? Perhaps you’ve increased the size of your family and now need further bedrooms? Our experts can help you decide where and how you extend. Our services include: EXTENSIONS & PORCHES GARAGE & LOFT CONVERSIONS RENOVATIONS ROOFING - Flat Roofing - Conservatory Roofs & Roof Windows - Roof Repairs and Replacements - Fascias, Soffits & Guttering We use expert advice even before you finalise your plans. If you can’t build outwards have you considered a loft conversion? Our dedicated page will provide more information. Standard Building have helped many people extend their living space over the years and we never get tired of seeing satisfied clients enjoying their new found space.

WELCOME INPROJECT CONSTRUCTION - Building your future, one brick at a time. We have completed numerous projects, from small renovations to large commercial constructions. Our portfolio includes residential and commercial buildings, educational and healthcare facilities, and industrial constructions. Our mission at INPROJECT CONSTRUCTION Ltd is to provide our clients with exceptional construction services that exceed their expectations. We are committed to delivering high-quality workmanship, on-time completion, and cost-effective solutions. What sets us apart is not just our ability to construct buildings but our commitment to building relationships. We believe in honesty, integrity, and transparency in all our dealings with our clients. We value teamwork, professionalism, and continuous learning and improvement. We prioritize transparent communication, ensuring that our clients are informed and involved at every step.

Dear Customer, We are a construction company with over 25 years experience. We undertake all aspects of building work, including new builds, extensions, lofts, total renovations, new bathroom and kitchens. All work guaranteed and certified for, GasSafe and NiCEiC approved on completion.

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Reviewed by Paul on 21/11/2024

Great job good price

Available for: Roof work repair or replace. Building and maintenance. Carpentry. Plastering. Plumbing. Electrics. Plumbing. Landscaping design and build.

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Reviewed by John on 5/2/2025

After initial contact he never came back to me. I messaged and phoned but no response.

JJ Walker property development. All trade contractors

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Reviewed by Keith on 5/8/2024

Everything done superbly well due to the efforts of Taylor. Kept us advised at all stages of the job. Would recommend unreservedly.

Family running business based in Gravesend. Our priority is excelent service and satisfide customer. Top quality work is our trademark. Specialised in all type of build work with very expirienced team. Plenty of references form our previous satisfied clients. In need of top quality builders? call for more informations.

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Reviewed by John on 2/8/2023

An excellent service, completed on time. Would recommend

We are specialists in exterior rendering application and maintenance. Offer long life, exterior protective spray wall rendering systems Full EWI System - External Wall Insulation Roughcasting Chimney rendering Silicone / Acrylic Thin Coat Monocouche/Scratch Render Smooth finish render All types of external rendering

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Reviewed by Karen on 24/5/2023

Ziggy did a fantastic job painting our (very large) garden fence. We wanted a freshen up before the rest of our garden was done, and Ziggy did exactly that… all with a smile on his face. He was very professional and friendly and put in a couple of hard shifts to get it done.

Danny General Builders specialises in structural work, extensions, refurbishing, loft conversions, roofing, fitting bathrooms and kitchens, and painting and decorating. All employees have more than 10 years experience and are insured.

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Reviewed by paul on 1/8/2023

Danny did an absolutely great job with my set of alcove shelves. He was friendly, diligent, extremely polite and did an excellent job. Highly recommend

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 Jenny on 9/10/2024

P & L have just completed today(9/10/24) our bathroom makeover & we are absolutely delighted with the work done. This was to remove existing floor tiles , prepare for new ones & fit & grout replacements. Then to fit a toilet bowl plus seat. All done in budget and to the timescale promised. They may well be equalled but never beaten. Thank you Peter & Adam you did a fantastic job. Regards Jenny & Jim

Having been in the field for over 3 years, working for people , decided to take it further by opening my own construction company. We are a dynamic construction company specializing in innovative and high-quality building solutions. We deliver excellence with a commitment to precision, efficiency, and customer satisfaction. We specialise in resin driveways, Resin internal floors, resin worktops we work with resin like no other. We also specialise in stretch ceilings(fabric ceilings) and Venetian plaster/polish plasters. We believe we are the only company that offers those services under one roof. Although we specialise in newer products, we never shy away from any challenges, as we are fully qualified plasters, ceiling installers, dry liners and in floor installation.

Keen Resources: Elevating Your Spaces for Years to Come Welcome to Keen Resources, your trusted partner in building and property maintenance solutions. Established in 2014 and proudly located in the vibrant North West London area, we are your go-to team for all your construction needs. At Keen Resources, we bring a wealth of experience to the table, with a family-run business that boasts a remarkable 25-year track record. We specialise in providing a wide range of services to Residential, Commercial, and Estate Agent clients, ensuring that every project is executed with the utmost precision and professionalism. Our dedicated team of experts covers a diverse spectrum of services, including: General Building: From the ground up, we craft solid foundations for your dreams to take shape. Roofing: Our experts ensure your property is protected from the elements with top-notch roofing solutions. Electrics: Safe and reliable electrical services to keep your property powered efficiently. Kitchen and Bathroom: Transforming these essential spaces into stunning, functional areas you'll love. Refurbishments: Breathing new life into tired spaces, making them vibrant and appealing. Plumbing: Efficient plumbing services to keep your property's water systems in excellent condition. Carpentry: Craftsmanship that adds character and functionality to your interiors. Tiling: Precision tiling work to enhance the aesthetics of your property. Painting and Decorating: Creating inviting and visually pleasing environments. Handymen (Multi-Skilled): Versatile experts ready to tackle any project with skill and efficiency. At Keen Resources, we are not just builders; we are partners in bringing your vision to life. We take immense pride in our commitment to delivering superior quality, meeting deadlines, and exceeding your expectations. Customer satisfaction is at the heart of everything we do. We believe that every project, big or small, deserves the same level of care and attention. With Keen Resources, you can trust that your project is in capable hands, and the end result will be nothing short of exceptional. Experience the difference with Keen Resources, where excellence in construction meets a passion for customer satisfaction. Contact us today and let's embark on a journey to turn your property dreams into reality.

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Reviewed by Anne on 7/2/2024

Excellent very pleased with your service. Have already booked a return

The smallest details can make a real impact when it comes to designing a space, but only a true professional knows how to bring these details together to create a seamless design. That’s where Complete Kitchens And Renovations comes in. With over 35 years experience and a team of skilled tradesmen you'll be in safe hands. ? We work throughout the South-East providing bespoke home renovations and extensions tailored to our clients’ needs. ? From a small kitchen installation to a full house renovation, no job is too big or small.

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Reviewed by sandra on 28/3/2024

Very happy with result.

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

With our extensive experience in home improvements, refurbishments, and building work, no job is too small or large. We've helped countless homeowners across our local area with creating their dream home. Get in touch today to see how we can help you. In case just a single room refurbishment isn't enough and you want to renovate your entire home then look no further than GNG Building Services Ltd. We have the skills to renovating your home a breeze!!!

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Reviewed by Sharon on 4/4/2023

A Wonderful man who completed the job in a speedy and professional manner. Job was completed a day earlier which was a pleasant surprise. Look forward to using the services again.

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Reviewed by Patrick on 13/3/2015

We are very pleased with the work carried out by R and J Lubbock. Richard and Dean installed internal wall insulation in a couple of rooms in our house. They turned up on time, carried out the work carefully, and left the rooms clean and tidy at the end of the job. I would not have any problem recommending them.

Profesional service.. To many years to mention in business. And all work carried out 100% satisfaction guaranteed.

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Reviewed by Pamela on 27/10/2024

Excellent job done by GPW, a hardworking family of guys who were most professional and hard working. Very pleased with all!

Fortune Construction was funded in 2005 by CEO Zygmunt. In 2014 the CEO partnered with Anna to implement the business on providing a stronger customer-focused approach, services and a constant quest for top-class quality, which has enable the company to sustain leadership in its major line of business. Fortune Construction is based in South London but works all around London on general building and refurbishing.

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Reviewed by Destiny on 2/2/2025

Zygmunt from AP South London did works in my house and fixed my fence. I got 3 quotes and went with AP South London because Zygmunt thoroughly explained what needed to be done and gave me options. His costs were reasonable and he was both friendly and professional. I have further works to do and would definitely go with them again. Thank you.

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