Extension Builders in St James

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.2 (19 reviews)

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Some of our top rated extension builders in St James

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Signature 1 Construction Ltd
Rating: 4.5 out of 5
Extension Builder in St James
Signature 1 Construction LTD is a family run business with over 25 years experience in the building industry. We specialise in extensions, loft conversions and full house refurbs. Every job we undertake we take great care of the clients house and are experienced project managers will look after you from start to finish.
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Latest review:
Extensions- 30 Sep 2025
Overall, I’m very pleased with the work Marin has carried out for us and I’m currently in the process of instructing him to do more work. Marin built a high spec cedar shed for us with electrics and plumbing, some brickwork and laid composite decking. Marin came across, honest and reliable, which in itself is rare. He was on site most mornings to make sure his tradesmen were on the right tracks. Like with a lot of these things there were some issues along the way and I was highly impressed by Marin’s ‘no quibble’ approach to rectify any problems. I myself have a high attention to detail and am quite indecisive (nightmare client) and Marin was happy to work with me with changes to the project without incurring extra costs.
ELB Construction services LTD
Rating: 5 out of 5
Extension Builder in St James
Established, respectable construction company which specialises in all aspects of building. we pride ourselves on giving clients a personal touch. Seeing you’re project through from getting planning permission to completing works to a hi spec finish. new builds loft conversions house extensions refurbishments Basements All type of general building undertaken
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Latest review:
Extensions- 23 Dec 2022
ELB Construction completed some major garden works for me and constructed a garden office. It was a big piece of work with a lot of earth moving, significant foundations and a lot of brickwork. The ELB team, specifically Jimmy the site manager, were fantastic, always giving me the right advice about things I was not knowledgeable about, always focussed on a quality finish and flexible when we had some challenges with our neighbours. The finish is great, communication was always open and honest and they were very competitively priced. My brother in law is in corporate construction and was specifically very impressed with the quality of the brickwork that Jimmy and the team produced. Thank you to the whole team!
LLC projects limited
Rating: 5 out of 5
Extension Builder in St James
At LLC PROJECTS LTD, we deliver high-quality building and renovation services across London, Surrey, and Hampshire. With over 16 years of experience in the construction industry, our team specialises in all aspects of building works, maintenance, and plumbing — from full refurbishments and extensions to kitchen and bathroom installations. We pride ourselves on excellent workmanship, attention to detail, and reliable project management from start to finish. Most of our work is carried out in-house to ensure consistent quality and high standards. Whether it’s a small repair or a large-scale project, we approach every job with professionalism, transparency, and care. Contact us today to discuss your next project and see how we can bring your vision to life
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Latest review:
I recently hired LLC Projects Limited to refurbish my ground floor and add a new bathroom, and I couldn’t be happier with the results. From start to finish, the team was professional, reliable, and truly cared about delivering quality work. The new bathroom looks amazing, and the ground floor transformation exceeded my expectations. Communication was great throughout, and they kept everything on track and tidy. The crew was friendly, and they handled any concerns I had quickly. I’d definitely recommend LLC Projects Limited for any home improvement work—they’ve earned my trust, and I’ll be calling them again for future projects
MPQ SERVICES LTD
Rating: 5 out of 5
Extension Builder in St James
My name is Youssef, and I’m an experienced plumber with a strong track record of delivering reliable, high-quality work. I specialize in both residential and commercial plumbing, including installations, repairs, and maintenance. With years of hands-on experience, I take pride in being punctual, professional, and committed to getting the job done right the first time. Client satisfaction and safety are always my top priorities.
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Latest review:
Plumbing- 8 Sep 2025
Great service, quick, efficient.. problem completely solved. Would highly recommend.
Proto Technica - Building Solutions Ltd
Rating: 4.8 out of 5
Extension Builder in St James
An established LIMITED company with a professional and flexible approach to clients. We deal with jobs such as home refurbishments, painting/decorating, plastering, renovations, extensions, outdoor works, etc. We have an experienced team specializing in a wide range of trades ready to tackle your jobs!
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Latest review:
Restoration & Refurbishment- 28 Dec 2024
We are impressed with our new kitchen and bathroom, such a transformation. Receiving so many compliments. Very dedicated and skilled team. Will definitely recommend.
Building
Rating: 5 out of 5
Extension Builder in St James
Elysium utilities ltd Hi Thank you for checking in at my page here at Elysium utilities ltd We are a team of qualified tradespeople and between us we can do pretty much all work required in your home.
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Latest review:
Decking- 23 Jun 2019
Very nice guy. Did a really good job on cleaning down and repainting my decking. Would definitely recommend.
Master Builders Developments Ltd
Rating: 4.6 out of 5
Extension Builder in St James
Newly Joined My Builder, We are a established Building firm specialising in Extensions, Loft Conversions and Refurbishments, we undertake commercial projects along with substantial size constructions. Our team over all elements of construction.
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Latest review:
Roofing (Pitched)- 26 Sep 2024
Keep this company as first choice for ur building work.
Tafix ltd
Rating: 5 out of 5
Extension Builder in St James
Hello, Tafix Ltd is specialised in carpentry and joinery jobs. We have a well-earned reputation for being punctual, reliable and completely trustworthy. Our team of skilled workers is always happy to help you with your project.
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Latest review:
Kitchen Fitting- 29 Nov 2020
Very satisfied with Tafix. Rewire, kitchen refurbishment and flat redecoration. Kamil and his team were extremely punctual and delivered high quality results. Step by step approach with impressive attention to detail. Creative in finding solutions to unexpected problems that arose. Kamil was proactive in advising on work outside of scope and happy to accommodate extra jobs where possible. Would recommend to others and will look to use for future work.
JDS Maintenance
Rating: 5 out of 5
Extension Builder in St James
Hi there, I am a Handyman, I got recomendations for my customers. Thanks a lot.
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Latest review:
Kitchen Fitting- 4 Apr 2025
Super professional, job completed properly. He is extremely knowledgable Would reccomend
3 plastering guys
Rating: 5 out of 5
Extension Builder in St James
London home developers take care and pride in our professionalism. We ensure minimal fuss for our customers and provide them with an end project of their exact want. London home developers are able to complete clients jobs such as Loft and extension, brick work, steel work, partitions, plastering, plumbing, luxury bathroom and much mor.
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Latest review:
Plastering- 5 Jun 2026
Very skilled, professional and a great person. Thank you Rami
LV Design & Build LTD
Rating: 5 out of 5
Extension Builder in St James
Longview Design & Build specialises in high-end architectural design in London. Our team take pleasure in understanding your vision and then guide you towards completion. We act as a one-stop-shop by providing you with all the tools you need to deliver success. Whether you’re looking to expand or refine your home with a loft conversion, rear or side extension, basement excavation, cellar conversion or a top to bottom refurbishment, we are the actual Design & Build construction company you are looking for. We saw a gap in the market – all construction companies out there were founded from builders – and we thought we could bring our experience as Project Managers, Architects and Structural Engineers in construction. As building designers we thought we could bring in our passion, attention to details, knowledge in new high quality materials and cutting edge technology to achieve high end designs for affordable prices. LongView Renovations specialises in loft conversions, extensions, basements, renovations and new build homes in and around London. Through our experience in both construction and design we are able to better understand our client’s vision & needs and solve any issues along the way even for the more complicated projects
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Latest review:
Have used LV on two occasions and have also recommended them to my neighbours. Great communication and professional throughout the process
Towergate Design
Rating: 5 out of 5
Extension Builder in St James
Towergate Design Studio is a London-based leading practice working in the residential and commercial sector. We have a reliable and excellent painting team with reputation for high-quality work, attention to detail, professionalism, including punctuality, clean communication and using quality materials. We are the A turnkey company provides a service from design to the final, fully functional and innovative building projects . We handle all aspects of a project, including design, engineering, procurement, construction, and installation.
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Latest review:
Painting & Decorating- 8 Jan 2026
Great job done - Bulent was quick to communicate and efficient in getting everything finished. He was careful to ensure a high standard of finish and I am very happy with the result. He even did extra bits like sealing our bathtub on top of the painting requested.
PLANNING APP LTD
Rating: 5 out of 5
Extension Builder in St James
We create architectural drawings. We are specialised in applications for planning permission and building regulations and co-operate with local structural engineers for structural calculations, party wall surveyors and building companies. Our projects include extensions, lofts, garages, house&flat conversions in different councils all around London. If you are thinking of extending, converting, or splitting your property do not hesitate to contact us for a free first consultation & quotation.
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Latest review:
CAD / Drawings- 23 Sep 2020
Marius has been doing a great job and put in an extra effort to ensure we were happy with the outcome. I can not recommend Marius highly enough, especially as he managed to fix an issue with the council that we had from someone else drawings. He was patient and very well prepared. Went an extra mile and gave us different ideas/options. He was flexible with timings and most importantly with price. Had by far the best quote and did an exceptional job.
GGS Brickwork
Rating: 5 out of 5
Extension Builder in St James
I have always been a very conscientious worker and enjoy what i do.
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Latest review:
Bricklaying- 17 Aug 2018
Lovely guy-good job, always kept me informed about when he was ģoing to appear, tidy and interesting to talk to!
S & S Builders
Rating: 5 out of 5
Extension Builder in St James
Hi my name is Stephen and I have 30 years building experience specialising in extensions and loft conversions I do 1 job at a time and I am on site every day. I have extensive knowledge of structural engineering I also carry building insurance .and i am a member of the National federation of builders.
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Latest review:
Extensions- 18 Jun 2025
Steve and his team were excellent throughout. Turned up on time every day, very reliable. Excellent attention to detail and great pride in their work. All areas of building work undertaken to a very professional standard. We had new bathroom fitted, new fence and handmade shed, lean-to rebuilt from scratch with new roof, patio doors, new flooring, plastering, outside patio. Very happy with the work. Good value for money. Highly recommended would use again without hesitation.
Martin
Rating: 5 out of 5
Extension Builder in St James
EAGLE UNIT CONSTRUCTION LTD WE ARE THE PERFECT COMPANY TO MAKE YOU HAPPY WITH YOUR HOME MAKE YOUR CHOICE NOW
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Latest review:
Painting & Decorating- 18 Sep 2022
Martin is a very attentive, multi skilled and thoughtful worker. His quote is accurate and honest. Most builders I have hired in the past offer a better price but then there is almost always additional 'hidden' costs. Martins work is thorough and works to completion. I would always hire Martin for a complete honest job knowing that I will get what I pay for. I would highly recommend him.

4.2

Top rated Extension Builders

Our Extension Builders in St James, are rated 4.2 out of 5 based on 19 reviews from customers like you.

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

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 St James 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 St James who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in St James?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in St James 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 St James extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your St James home extension project is likely to cost.

Find extension builders in St James with MyBuilder

Hiring the right extension builder in St James 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 St James extension builders. Once your job is live, we’ll share it with home extension builders in St James who can express their interest.

Step 2: Compare different extension builders in St James

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

Step 3: Hire St James extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in St James, 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.

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

What to ask a St James extension builder before hiring?

Before hiring an extension builder in St James or extension building company in St James, 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 St James?

An extension builder in St James 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 St James 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 St James?

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 St James 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 St James 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 St James

Can an extension builder in St James help with planning permission?

Yes, many extension builders in St James 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 St James handle everything from design to construction?

Many St James 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 St James help with materials and finishes?

Yes, most extension builders in St James 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.