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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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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

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
- Size of the Extension: Larger extensions require more materials and labour, increasing the overall cost.
- Type of Extension: Different types of extensions (single-storey, double-storey, loft conversion) have different cost implications.
- Materials Used: The choice of materials for walls, flooring, roofing, and finishes can significantly impact the cost.
- Location: Costs can vary based on your location, with projects in urban areas typically costing more due to higher labour rates and material costs.
- 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.

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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Driveways specialist Tarmac concrete and block paving resin drives and paths fencing and decking Roofing Flat roofing Astroturf Traditional turf power washing exterior painting Waste removal Rendering Silicone render Trees lopped, topped and prune Drainage and soak away And much much more
Both jobs were completed professionally. Whole team was efficient, pleasant and knowledgeable and finished before time advised
Up Above Group
House Extension
Built on a foundation of expertise, Up above roofing and lofts brings a wealth of knowledge and experience to every project we undertake. We are committed to delivering the highest quality of workmanship and service to our clients. Our team is dedicated to providing the best possible experience from the initial walkthrough to the final walkthrough, we take pride in our work and stand behind it with 100% satisfaction guarantee
hello, we are a small building service . clean tidy friendly tradesmen specializing in small building projects. high standard of quality assured. city n guilds time served tradesmen. Certificates in lime mortar repointing heritage
Jay assessed the job in person and gave me a fair quote on the spot. He’s just done the job on a Saturday and it looks great!
We are a company with over 15 years experience across UK and Europe.
We used AB for a garage renovation inc replacement roof, doors, windows, add electric & plumbing. Extended engagement to cover the complete landscaping of a walled garden which incl stone patio, walkway, rendering and wooden terraces. continued with a kitchen roof replacement & wall rendering, & a kitchen interior remodelling that included new walls, ceilings, plumbing, electrics & chimney removal. Highly recommend you discuss your project with Viorel
Been working as a joiner for 14 years. Happy to say I can put my hand to most types of joinery from building house or extensions, to fitting kitchens and finishings.
I had a tight schedule for my job to be completed in, and Ryan got it done to a fantastic standard, and made me feel like a valued client at all times. Highly recommended, thank you!
We are a family run buisness who are happy to help no job to small or to big
Richard was cheerful and diligent during the job. He arrived on time with an assistant and completed the job in the two days that he had quoted.
Hello my names Robert from Affordable Property Maintenance where our number one priority is customer satisfaction, all our work is carried out at the highest standards using only the best materials. We do a professional job at affordable prices and guarantee all work carried out, with over 15years experience you can rest assured we can handle the smallest to the biggest of jobs all carried out and completed by professionals. We offer free estimates and advice so please feel free to contact us today!
We are a small family run building and maintenance company that can cater for all your needs. We are reliable and offer a very professional service with very competitive rates. We offer free no obligation quotes so come give us a try today
MADE APPOINTMENT BUT NEVER TURNED UP
CONSTRUCTION BUSHI LTD
House Extension
10 years in masters builder federation New on this website
Proiectarea gr?dinii ?i între?inerea amenaj?rii teritoriului Îngrijirea gr?dinii ?i cur??area frunzelor Presiuni Sp?lare Altele ad?ugare de locuri de munc? Arrangements and painting
We deal with insurance claims handling, reinstatement and repairs to any type of reinstatement including damage caused by escape of water, flood and fire damaged properties. We also completed works involving: Non-evasive leak detection. Insurance surveying / Schedules. Damp mapping and drying. Refurbishment and repairs to residential commercial buildings. Replacement kitchens and bathrooms. Plumbing. Plastering. Roofing. Painting and decorating. Asbestos surveys and removal. Carpentry. We are also a member of the The British Damage Management Association (BDMA)
BNT Construction ltd offers a full range of construction services. We take pride in offering competitive services at competitive prices. Services ranging from Groundworks to full house refurbishment or home maintenance ,drainage , basements , piling . Also we can pride ourselfs as the fastest and reliable builder as per customer satisfaction . Latest extension completed from the aprovals of documents and council agreement 4 and half weeks thats based on demolishing the existing build and rebuild the entire extension with fitted kitchen underfloor heating etc. Quality and profesionalism are and always be a priority !!!! Team BNT
Excellent service! Will definitely use again!
We at Zora Construction Ltd providing top quality works to our customers. Our staff is highly experienced in all kinds of building works. All of our work is fully guaranteed.
We agreed date and time & they didn’t turn up for the job
Our team has 20+ years of experience in the construction industry
Demaj construction gave a reasonable quote and completed the job on time and to a very high standard. We will be happy to use their services in the future.
Hi I’m shaun of BSG Builders I work mostly around the Hull area but I am flexible on travel if my services are required further afield.I am a time served bricklayer by trade with over 30 years experience in the building trade.I like to think that I am a genuine builder who always talks to the client and keeps them informed on the works. I have a page on Facebook under BSG Builders If you would like to take a look . I look forward to hearing from you please feel free call and ask advice if I can help you I will . Thanks shaun
Probably the only guy that came round and gave me a good qoute. Work done without fuss and to a high standard. Absolutely no problems and would recommend him to anyone.
I’m a multi trader with 50 years experience and a construction industry. I specialise in bathrooms, kitchens, tilling and laminate flooring. I take full pride in my work and come with 1 million pound public liability insurance.
Found working with Phil on this project comforting as not only very good at what he does but helped direct me in the right path in getting the project done to a good standard! Will be working with him on other projects. good friendly service.
QI Building Solutions is a construction and design company with over a decade of experience in the sector, servicing the areas of Essex, Kent, and London. We are known for our meticulous work, responsible attitude, commitment to deadlines, and attention to detail. Our Services: 1. Dry lining If you’re looking for a dry lining contractor in the area of London, Kent, or Essex, you don’t need to look any farther than us. We have over 8 years of experience installing lightweight cold rolled steel structures, metal frame partitioning, and suspended plasterboard and gridded ceilings systems. We recognize these complex finishes need to be installed carefully so that your project is completed to the superior standard you deserve. Our team of installers and managers ensures our clients’ peace of mind. Everybody we work for can rest assured that we’re able to carry out any dry lining project as instructed. 2. Plastering / Tape and jointing QI Building Solutions offers plastering/tape and jointing services for commercial and residential projects. Our efficient, professional team ensures a finish of exceptionally high standards irrespective of the complexity of the work. As some dust can be created as you sand down in the process of tape and jointing, we utilize dust extractors to keep that down to a minimum. It is fitted to a drywall sander and makes sure the work environment will remain pleasant and risk-free. We also offer great rates and work with the highest-quality materials, such as Knauf and British Gypsum. Of course, our clients are more than welcome to choose the materials and manufacturer – we are happy to work with your selected brand! 3. Tiling With over a decade of experience, QI Building Solutions has a spotless reputation (to quote the great Shakespeare) in this field. The reason is because we deliver superior work, incorporating everything from offices and small retail sites to complicated residential buildings. Please know that no job is too big or too small for us! Qualifications Our team carry the necessary City and Guilds/NVQ qualifications to carry out their jobs. Our qualified supervisors have passed SSSTS training. Insurance For your peace of mind as well as our own, we have £5 million public liability insurance and £5 million employer’s liability insurance.
Build of custom tv enclosure executed to perfection. Turned out to be a lot better than expected and would definitely recommend to others.
At AQL Renovations, we’re all about turning your home into a haven of perfection with our delightful carpentry solutions. Based right here in Suffolk, our team is geared up to bring a touch of craftsmanship to your space, making it uniquely yours. We pledge to imbue each project with community value, infusing it with professional expertise, unparalleled customer service, and the hallmark of quality construction.
K1 Building and electrical is fully experienced building company supplying the full range of building sevices . We aim to give the highest standard of work we can to every customer . As a long standing building company we have made some great partnerships with othe trades and we can now offer the full building package with K1 taking care of the management so we can get the project finished with out all the hassle of you the client looking for separate trades. We have now completed a full range of building projects and can supply loads of references and photos. We look foward to completing your project to our highest standards.
Kaz installed 6 Fire Rated doors to the specification we agreed.
M I Bone Builders
House Extension
Family business with over 35 years experience. We are a multi trade business and can undertake everything from drawing up plans to laying carpet. We are also contractors for a number of local authorities.
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