Extension Builders in Streatham

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.8 (17 reviews)

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Some of our top rated extension builders in Streatham

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Crystal Core Limited
Rating: 5 out of 5
Extension Builder in Streatham
Welcome to Crystal Core Construction At Crystal Core Construction, we provide high-quality building and renovation services across London. With over 7 years of industry experience, we take pride in delivering reliable workmanship, honest advice, and excellent customer service. Our Services House Extensions Loft Conversions Full Property Renovations Kitchens & Bathrooms Plumbing & Electrical Work Tiling & Flooring Painting & Decorating Brickwork & Plastering Fencing,Paving, Patios & Landscaping Why Choose Us? ✔ Over 7 years of professional experience ✔ Fully registered and verified company ✔ Free, no-obligation quotations ✔ High-quality workmanship with attention to detail ✔ Honest pricing with no hidden costs ✔ Projects completed on time and to a high standard Whether you're planning a small home improvement or a complete renovation, we're committed to delivering quality work and a smooth, stress-free experience. All-in-One Solution: From the first brick to the final coat of paint, we manage the entire project so you do not have to juggle multiple contractors. Contact Crystal Core Construction today for a free quotation. We look forward to helping bring your project to life.
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Latest review:
Fencing- 19 Aug 2026
The work is still ongoing but the team are fabulous. So accommodating and hard working. I would highly recommend them
Knidos Enterprises Limited
No reviews yet
Extension Builder in Streatham
With over 25 years of experience in the construction and home renovation industry, we have successfully completed a wide range of projects, from full-scale home remodels to smaller custom renovations. Based in London, we serve clients locally and are also available to travel to within M25 and surrounding areas, ensuring our services are accessible to a broader community. Our expertise spans across skills such as carpentry, decorations and detailed interior design. We take pride in our commitment to quality craftsmanship, attention to detail, and excellent customer service, making sure every project is completed on time and within budget. When you hire us, you’re choosing a team that values integrity, hard work, and customer satisfaction above all, delivering results that enhance your living space and add lasting value to your home. We are more than happy to work with you and serve for your needs. Please do not hesitate to get in touch with us for any kind of questions and find out more about our +50 completed projects in London. Cheers!
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S&s construction
Rating: 5 out of 5
Extension Builder in Streatham
We can do , electric, plumbing, plastering , painting all building work
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Latest review:
It was a time challenge for me to move to newly purchased house as my rental agreement was due. I got Saby from personal reference. All home colour, wiring, removing old big boiler, water tank and rerouting of all pipe work. Roof repair , new two en suites construction, whole IKEA kitchen. He delivered as per our expectation and design in 8 weeks. No time waste and all material he arranged. I am very happy the way he professionally handled the work and delivered on time. I would recommend him. Make sure your design is ready and perfect. Discuss with him before start and avoid changes for best results.
Harwinder
Rating: 5 out of 5
Extension Builder in Streatham
Welcome to my MyBuilder profile! With 25 years of experience in construction, I specialize in carpentry, roofing, loft conversions, and extensions. I've worked with numerous large companies, delivering high-quality results tailored to clients' needs. I'm committed to excellence, and I look forward to making your vision come to life.
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Latest review:
Roofing (Pitched)- 20 Apr 2023
Harwinder and his roofers did too quality work for us. First time we used them and we were very happy with the results. Reliable and reasonable. We would highly recommend them and we shall be using them in future
DB Chiswick
No reviews yet
Extension Builder in Streatham
Firstly, I hope you are well and thank you selecting us. We specialise in total renovations, extensions, loft conversions and basements. We have extensive London property market knowledge and can design, advice so you get the best investment out of your renovation. We also work with a bespoke kitchen manufacturing company, windows, doors & bedrooms. Currently operate in France, Switzerland, Germany & UK. All we ask is for the opportunity to meet you and we promise we will deliver.
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Cray valley refurbishment
No reviews yet
Extension Builder in Streatham
We are a close knit building company where customer satisfaction comes first. We handle all aspects to do with your home, from refurbs to extensions. We understand everyone has different ideas and quirks and we strive to deliver the home that you are proud to come home to after a long day's work.
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B&K
Rating: 5 out of 5
Extension Builder in Streatham
B.K. Building & Renovation is a family-run building and renovation business based in South Harrow. We provide reliable, high-quality work across extensions, brickwork, blockwork, plastering, painting and decorating, tiling, flooring and general property improvements. We take pride in clean workmanship, clear communication and attention to detail from start to finish. Whether it is an internal renovation, plastering and finishing work, brickwork, flooring or a larger building project, we aim to complete every job safely, neatly and to a professional standard. Customers choose us for our reliable service, respectful approach, tidy working habits and commitment to quality. We treat every property with care and work hard to deliver results our customers are happy to recommend.
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Latest review:
Benjamin and his team did a fantastic job on my property building a 6m by 6m Extension walls in only 2 days, it was done ahead of time and on budget. He was very conscientious and nothing was to much trouble. Done all the pictures of each step along the way needed for Building Control Guy. The quality and workmanship was first class and I would definitely recommend him for all types of building/refurbishment work.”
Loft Haven Ltd
No reviews yet
Extension Builder in Streatham
We specialise in a wide range of loft conversion types tailored to different property styles. Whether you’re considering a space-enhancing Dormer, a bright and airy Velux loft, or a full Mansard transformation, we offer bespoke solutions to suit your needs. Our expert team will guide you through every option – including Hip to Gable and L-Shaped Dormers – to find the ideal fit for your home, layout, and lifestyle goals.
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The Britstatus Company LTD
No reviews yet
Extension Builder in Streatham
The Britstatus Company Ltd — Professional Building Services in London About Us We are a family‑run construction company with over 5 years of experience in residential and commercial projects. We operate across London and surrounding areas, ensuring quality, punctuality, and a professional approach at every stage of construction. Our Services House renovation and full refurbishment Extensions and loft conversions Carpentry (1st and 2nd fix) Bricklaying and masonry Drywall installation and plastering Kitchen and bathroom fitting Painting and decorating Flooring (wood, tiles, laminate) Roofing and guttering Landscaping and fencing General building work Why Choose Us? Experienced and reliable team Family‑run company with high standards VAT registered and fully insured Own tools, transport, and PPE Attention to detail Free quotes Available For Private clients Construction sites Property maintenance Renovation and refurbishment Subcontracting Ready to build something great together.
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A J Wilkes
Rating: 4.8 out of 5
Extension Builder in Streatham
I HAVE BEEN WORKING IN THE CONSTRUCTION INDUSTRY FOR THE LAST 25 YEARS ON ALL DIFFERENT SIZE PROJECTS.I HAVE ALL FULLY QUALIFIED PEOPLE WORKING FOR ME AND CAN GIVE REFERENCES ON REQUEST. I HAVE ALSO BEEN POLICE CHECKED AND HAVE THE CERTIFICATION TO PROVE IT. This tradesperson previously traded as A J Building Management Ltd (10518847). All feedback received prior to 11 October 2023 relates to A J Building Management Ltd.
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Latest review:
Extensions- 25 Apr 2026
Excellent job, very well project managed - everything went to plan and came in time, progressed at a steady pace. We're very happy with the end result, and everyone says "wow" when they walk in. :)
A S Builders
Rating: 5 out of 5
Extension Builder in Streatham
We are a family run business in construction industry since 1990, initially started by my father and now his sons have joined the business and looking to revitalised the business through the use of up-to-date technology. We undertake all types of building work through our team of skilled labour from a small job up to New Build. Our most recent job was conversion of a detached property to 7 HMO's.
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Latest review:
Extensions- 29 Apr 2026
Heera, Jagthar and team was my first personal experience with builders. Let me tell you, it was a pleasure to have them do our porch and other renovations in the house. They are so courteous, hard working and provided a great service. Firstly, I had a comprehensively written quote breaking down all of the steps required. Heera then ensured to keep me in the loop of any developments/any changes of plan required, outlining the reasons why and options, making it easy to understand and work together to completion. Their finish was to a high quality and they would always go the extra step to ensure this. I highly recommend AS Builders for any job and will definitely use them again in the future, and would recommend to my friends and family also. If you are considering them, grab a free quote and go from there... That's what I did! Thank you AS Builders for our renovations!
Matthews Project Services LTD
Rating: 4.6 out of 5
Extension Builder in Streatham
Hello, I’m Leigh Matthews, Managing Director of Matthews Project Services Ltd (MPS). We’re a Sutton-based company specialising in high-quality construction and project management services across London and the South East. With over 17 consecutive years of industry experience, we pride ourselves on delivering reliable, efficient, and cost-effective solutions whether it's residential refurbishments, commercial fit-outs or infrastructure works. We’re committed to clear communication, professional standards, and ensuring every project is completed to the highest level of satisfaction. No job is too big or small, and we’re always happy to offer advice or a free quote.
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Latest review:
Restoration & Refurbishment- 2 Apr 2026
Really pleased I chose Leigh Matthews for this job. We were taking over a building that was unoccupied for 18 months and there were some issues with that, The team were excellent, and they finished the 4-week job on time, and right on budget. They were helpful and considerate and left the premises clean and tidy. They were also able to help out with some problems with the plumbing that were not in the original scope. I loved the way they did the estimate and the invoicing. Breaking all the items down into the individual tasks and at the end of each week, itemising which tasks were complete and a %age on those in progress. I would not hesitate to employ them again
bA_
No reviews yet
Extension Builder in Streatham
Italian Architect in London with more then 20 residential project in Lobdon. From planning permission to construction. If you have a roof or a back or a basement extension please contact me. Looking forward to hearing from you. Arch. Samuele
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P&A Building&Decorating
Rating: 5 out of 5
Extension Builder in Streatham
We offer a wide range of building and decorating solutions such as: Kitchens Bathrooms Plastering Roofing Flooring Painting Decorating Plumbing Including CORGI Gas Safety Electrics Including And NICEIC Certificate Extensions Loft Conversions. Warranty All Works Fully Guaranteed
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Latest review:
Piotr ( Peter) has been trustworthy, reliable and very good value for money from the moment he started working on my flat. His work has been completed fast, with accuracy, and always leaving the surrounding area clean and tidy. I recommend him to my friends and am happy to give more references if required.
KB Kustom Builders Ltd
No reviews yet
Extension Builder in Streatham
Build your dream home, at KB Kustom Builders LTD we aim to guarantee 100% customer satisfaction. With over 5 years experience in the industry we offer a range of services, specialising in landscaping, kitchens, bathrooms and full house refurbishments, both interior and exterior. We have built a great reputation with our clients over the years ensuring we deliver the highest quality of work and exceeding our clients expectations.
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H & F London Limited
No reviews yet
Extension Builder in Streatham
H & F London is a specialist construction company based in Hertfordshire & West London. We’re known for providing groundwork solutions & new builds for a variety of clients across London and Hertfordshire.
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3.8

Top rated Extension Builders

Our Extension Builders in Streatham, are rated 3.8 out of 5 based on 17 reviews from customers like you.

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What types of services are offered by local extension builders in Streatham?

Building an extension is a major milestone for any home. It’s not just about adding extra space, it’s a big step that can transform how you live day to day, opening up new possibilities for comfort, lifestyle, and family needs.

This is why it’s so important to find the right extension builders in Streatham for you. They can help with a variety of tasks and projects, including:

Extending your home with an extra room
Two+ storey extensions
Adding partition walls to create more rooms
Building annexes or external structures

To find the right extension builder near you, simply post your job on MyBuilder. Explain the type of help you’re looking for, and then home extension builders in Streatham who are available and interested can respond to your post.

Browse profiles, read customer reviews and get quotes from your chosen Streatham extension builders, all before you decide who to hire.

What are the hourly rates of extension builders in Streatham?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in Streatham will charge between £16 and £42 per hour.

Single-storey rear extensions cost between £20,000 and £60,000 depending on size and finish.
The cost of double-storey extensions, which add more space and value, can range from £100,000 to over £170,000.
Larger wrap-around extensions that combine multiple extension types can range from £40,000 to over £120,000.

The cost of an extension will vary depending on your property. For instance, extending in certain areas may require structural adjustments to ensure stability, which can increase your material and labour costs.

To get an accurate price for your home extension, request detailed quotes from several Streatham extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your Streatham home extension project is likely to cost.

Find extension builders in Streatham with MyBuilder

Hiring the right extension builder in Streatham with MyBuilder couldn’t be easier. Just follow these simple steps:

Step 1: Post your extension project on MyBuilder

Whether you’re planning a single-storey extension, a loft conversion, or adding a new room, post your job on MyBuilder to find local Streatham extension builders. Once your job is live, we’ll share it with home extension builders in Streatham who can express their interest.

Step 2: Compare different extension builders in Streatham

When you start receiving interest, review profiles of local Streatham extension builders, check their previous work, and read real customer reviews. Ask about timelines, materials, and request detailed quotes.

Step 3: Hire Streatham extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Streatham, compare their experience, guarantees, and costs before choosing who to hire.

You’ll also have confidence knowing that every tradesperson on MyBuilder is verified through several checks, including:

ID verification: When a tradesperson joins MyBuilder, we ask for a valid ID, such as a passport, ID card, or eIDAS certificate.
Company verification: For tradespeople operating under a company, we make sure every tradesperson has a registered business.

Did you know? Our continuous monitoring and complaints process ensures that tradespeople who don’t meet our standards are promptly removed from MyBuilder’s platform.

Streatham extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a Streatham extension builder before hiring?

Before hiring an extension builder in Streatham or extension building company in Streatham, ask a few key questions to make sure you’re choosing the right professional for your home extension project.

What qualifications and experience do you have as an extension builder in Streatham?

An extension builder in Streatham should have a strong track record with similar projects and relevant building qualifications or trade memberships, such as the Federation of Master Builders (FMB) or TrustMark.

Will my home extension meet all building regulations and planning requirements?

Your Streatham extension builder should ensure the project complies with Building Regulations and, where necessary, handle or assist with planning permissions. Ask how they manage building control inspections and what documentation you’ll receive once the project is complete.

What experience do you have with similar extensions in Streatham?

Ask to see examples of their previous work, or view examples of their work on MyBuilder. Ideally projects similar to yours in scale and design. This helps you assess the Streatham extension builder’s ability to deliver a result that meets your expectations.

How long will the extension take to complete?

Extension project timelines can vary depending on size, complexity, and weather. A typical single-storey extension might take around 8 - 12 weeks. Request a detailed schedule so you know what to expect and when key milestones will be reached.

Do you offer a guarantee for your work? Most Streatham extension builders offer a guarantee or warranty on their work, often between 1 and 10 years depending on the project and materials used. This gives you assurance that any issues will be resolved after completion.

If you still have questions about the professional you are looking to hire, we have a full detailed guide on hiring the right builder here.

FAQ: Common questions about home extensions in Streatham

Can an extension builder in Streatham help with planning permission?

Yes, many extension builders in Streatham can guide you through the planning process. They can help prepare drawings, advise on local requirements, and liaise with your local council to ensure your project meets all necessary regulations.

Can an extension builder in Streatham handle everything from design to construction?

Many Streatham extension builders offer full design-and-build services, managing both the architectural planning and construction stages. Ask your builder whether they can provide a complete package or if you’ll need to hire an architect or designer separately.

Will an extension builder in Streatham help with materials and finishes?

Yes, most extension builders in Streatham can source materials and offer advice on finishes that suit your design and budget. You can also choose to supply certain materials yourself, just make sure this is agreed upon before work starts.