Extension builders in Chelmsford

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.4 (9 reviews)

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Some of our top rated extension builders in Chelmsford

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K Ellis builders
No reviews yet
Extension Builder in Chelmsford
Have worked in the building industry for the past 30 years have a small team that know what we are doing . For all your building needs DBS checked Liability insurance We try and overcome any obstacles to create your dream
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SureBuildRenovations LTD
Rating: 5 out of 5
Extension Builder in Chelmsford
SureBuild Renovations is a trusted local building company with over 40 years of family experience in construction. We specialise in home renovations, tiling, extensions, and property refurbishments across East London and Essex. Whether you’re updating a bathroom, fitting a new kitchen, or transforming an entire home, we deliver high-quality workmanship and clear communication from start to finish. Our skilled team covers all trades — including tiling, plastering, carpentry, plumbing, flooring, and decorating — ensuring your project is completed smoothly and to a professional standard. We take pride in being reliable, tidy, and easy to work with, and most of our new clients come from recommendations. For honest quotes, quality finishes, and a team that cares about your home as much as you do — choose SureBuild Renovations
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Latest review:
Restoration & Refurbishment- 5 Oct 2026
Very pleased, all went perfect.
4W Building Services
Rating: 5 out of 5
Extension Builder in Chelmsford
Hello, we are Craig and Richard, brothers who’s company is 4W building services. We pride ourselves on our workmanship, commitment to the customer and a quality finish. With 40+ years experience between us and more in the team we have, there is nothing that we can’t achieve to visualise your goals on your project, whether it be a loft conversion or extension. We also specialise in installing kitchens and bathrooms.
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Latest review:
Extensions- 13 Feb 2025
Richard and Craig were very professional, left property clean , done a fantastic job , I will definitely use them again , 100% recommend
Flynn & Co Construction Ltd
Rating: 5 out of 5
Extension Builder in Chelmsford
Flynn & Co Construction Ltd is a Team with over 25 years experience.We pride ourselves on offering quality workmanship at competitive prices. All our work is fully guaranteed. Thank you
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Latest review:
Kitchen Fitting- 4 Jul 2017
Did an excellent job on our new kitchen. They carried out the work as quoted - no nasty surprises/extras. Very pleasant team. Kept us informed at all stages of the project and always turned up as promised. Would use them again. Very satisfied customer.
G&N CONTRACTS LTD
No reviews yet
Extension Builder in Chelmsford
With over 15 years of hands-on experience in carpentry and joinery, I deliver tailored, high-quality solutions for both residential and commercial projects. Driven by precision, perfection, and a passion for modern craftsmanship, I invest in the latest tools and industry innovations to ensure efficient, accurate, and long-lasting results. Fully equipped, accredited, and holding a range of industry qualifications — including CSCS Skilled Worker cards, SSSTS, and up-to-date DBS checks — I take professionalism and safety seriously on every job. I am also an accredited BM TRADA Fire Door Inspector, able to provide complete fire door services, including: • Full fire door inspections • All remedial and replacement works • Issuing up-to-date BM TRADA fire door certification Covering a wide spectrum of carpentry and joinery — from bespoke interiors and finishing to structural works and commercial fit-outs — I offer reliable workmanship paired with clear communication, practical advice, and a smooth project experience from start to finish.
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B.E Home Improvements
Rating: 5 out of 5
Extension Builder in Chelmsford
Local building company. Loft specialists with a decade of experience. Why move out when you can move up? Complete loft packages available from plans to completion. Will work off your plans.
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Latest review:
Loft Conversion- 20 Jan 2026
I have chosen Byron and his company to complete my loft conversion. Job was completed within given time frame. Byron and the team were polite and hard working. During the building time, any issues found by myself were addressed and rectified as much as possible. At the closing weeks of my project, I have asked Byron to complete additional carpentry tasks. He found the time to accommodate my requests. Job had some messy stages but Byron was always trying to leave site clean as much as it was reasonably possible. Thank you for your work and I would be happy to hire you again in the future.
RDC Contractors Ltd
Rating: 5 out of 5
Extension Builder in Chelmsford
At RDC Contractors, we’re dedicated to transforming outdoor spaces into breathtaking landscapes that enhance the beauty and functionality of your property. With years of experience and a passion for craftsmanship, we take pride in delivering top-notch paving and landscaping solutions tailored to your unique needs. Over 35 years of experience. Paving & Landscaping specialists. Resin bound experts you can trust. - resin driveways / pathways - block paving - natural stone paving - groundworks - patio laying - composite decking - fencing - bricklaying & garden walls We proudly offer a 5-year guarantee on all our services.
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Latest review:
Thank you so much for our wonderful new garden, our patio looks beautiful. Everyone was very polite and professional we couldn’t have asked for more, recommended by Charlotte & Steve, Billericay, Essex
Supreme Spreads
Rating: 5 out of 5
Extension Builder in Chelmsford
Plastering and maintenance fully insured and fully qualified to do the jobs we tender for. If I can't do the job myself, some one on my team will be able to do it. No job too small. See reviews and pics for more info Only shortlist if you are serious. Daniel
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Latest review:
Extensions- 24 Aug 2023
Dan is a very professional builder. He looked at every single detail of my garage and worked very to make sure he completed the job on time. He always came out with ideas to make my garage nice and safe. He insulated the floor ceiling and walls properly, plastered everything, fitted new windows and doors, built a very nice deck area, extended electric circuit, added spots light, renewed felt roof, changed the existing gutter, plastered everything. My garage now is ready to be used as an office with everything I need. I would definitely recommend him. Thank you Dan
Trevor chamberlain
Rating: 5 out of 5
Extension Builder in Chelmsford
Hi im Trevor Chamberlain im a qualified and insured builder and Landscaper with over 25 years of experience in Essex and surrounding areas. Key Services: • Patios • Driveways • Brickwork • Extensions • Turfing • Fencing I pride myself on being reliable, tidy, and transparent. Check my gallery for photos of my recent work Ill look forward to working with you
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Latest review:
Bricklaying- 29 Mar 2026
Trevor is a true professional. The paving work was completed beautifully and to an exceptionally high standard. I really appreciate the care he took with the design, as well as the time and attention he dedicated to delivering such a great result.
HURRICANE CONSTRUCTION LTD
Rating: 5 out of 5
Extension Builder in Chelmsford
Essex based building company dealing with renovations, extensions, new builds and commercial building projects - as well as carpentry contracting, kitchen fitting, all general building requirements.
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Latest review:
Extensions- 26 Jan 2023
From first meeting Andy I got a good feeling, turned up when he said he would to view the job, provided an estimate very quickly too, based on the initial drawings. Once the final quote was agreed, (after structural calculations) other than additional works that were required (outside of Andy’s control) there was no overrun at all. All this during a time of hugely increasing prices. Throughout the build they used good quality materials and didn’t try to reduce his costs, right down to the paint upon decoration. Offered help and advice on other parts of the build that I was taking on myself, and we are very happy with the finished extension. There was an overrun on proposed completion date, but Andy tried to keep me updated throughout, I also have no concern should I ever need to call Andy back for any issues, but don’t expect that to be needed. Thanks Andy and team.
AD Carpentry
Rating: 5 out of 5
Extension Builder in Chelmsford
We are a family run building company that pride ourselves on our friendly, punctual nature and aim for the highest of quality workmanship.
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Latest review:
Painting & Decorating- 15 Sep 2021
Really pleased with the work the guys have done - nice and quick (despite some very heavy rain!) and to a high standard. No problem recommending Alex and the team.
S & K Contractors
Rating: 5 out of 5
Extension Builder in Chelmsford
Hi my name is Steven. I have been in the construction industry for over 35 years. On qualifying as a carpenter and Joiner in 1989,my experience evolved leading me to work on many public buildings including library’s,churches, town halls etc. I was employed between 1997/2013 as a site/contracts manager for a large building company in London. Over the years I have obtained an extensive knowledge covering all aspects of the building industry. I hope my feedback helps reflect this.
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Latest review:
Extensions- 15 Jun 2025
Chose Steve from S&K to revamp and modernise our tired conservatory enabling us to make the area a useable living space. From the outset Steve got what we wanted and made some suggestions to both enhance what we were looking for and also advising of ways to reduce the cost. Steve and the guys he uses were, polite, punctual, courteous at all times and always tidied up after themselves. As with all jobs, there were a few obstacles we had to encounter during the project, but Steve kept us updated, gave us options and help us navigate through the challenges. We now have a nice area added to our house which exceeds our expectations, will definitely be using Steve again if the need arises.
Bti plumbing and bathroom solutions
Rating: 5 out of 5
Extension Builder in Chelmsford
🔧 BTI Plumbing & Bathroom Solutions Professional plumbing & bathroom services across Essex, East London & Kent. At BTI Plumbing & Bathroom Solutions, we provide a reliable, professional and friendly service for homeowners, landlords and property owners. Whether you need a small plumbing repair, emergency assistance, bathroom installation or a complete bathroom transformation, we aim to make the whole process straightforward and stress-free. Our services include: 🔧 General plumbing & repairs 🚿 Bathroom fitting & installations 🚽 Toilet repairs & replacements 🚰 Taps, sinks & appliances 💧 Leaks & burst pipes ♨️ Radiators & heating pipework 🔩 First & second fix plumbing 🛁 Bathroom plumbing & pipework 🏠 General maintenance & repairs Why choose BTI? ✅ Reliable & professional service ✅ Clean & tidy workmanship ✅ Clear communication ✅ Competitive & transparent pricing ✅ Attention to detail ✅ Quality workmanship ✅ Domestic customers & landlords welcome We treat every property with care and aim to provide a professional service from the initial enquiry through to completion. From a leaking tap to a complete bathroom installation, no job is too small. 📍 Essex • East London • Kent 📩 Message BTI Plumbing & Bathroom Solution
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Latest review:
A big thank you to Bobby from BTI Plumbing & Bathroom Solutions for doing a fantastic job. Bobby came out to fix a leak and change the taps on the bath. He was professional, friendly, reliable, and did a great job. Everything was completed to a high standard, and I’m really happy with the result. I would definitely recommend Bobby and BTI Plumbing & Bathroom Solutions to anyone looking for a trustworthy and professional plumber. Great service from start to finish!
Investment building uk ltd
No reviews yet
Extension Builder in Chelmsford
Investment building is a family run business incorporating expertise, skill and knowledge passed down from generation to generation. With a history spanning over 30 years, our firm have the advantage of both wisdom and ingenuity providing our customers with an altogether higher standard. Our products and services are widely varied,ranging from complete building renovation and restoration, to single pieces of highly crafted ornate woodwork, kitchens and bathrooms.
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Stuart Lewis Carpentry
No reviews yet
Extension Builder in Chelmsford
Ive Trained as a Carpenter 20 years ago and have undertaken all carpentry works along with building works as in extensions, refurbs and new builds
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South Essex Construction Limited
Rating: 5 out of 5
Extension Builder in Chelmsford
Hi, my name is David and I have worked in the construction industry for over 35 years. During this time I have constructed new builds, extensions, loft conversions, landscaping, driveways and bespoke garden buildings. I use a team of highly skilled tradespeople to be able to complete your project from start to finish. I supply free fixed quotations and pride myself on communication, customer satisfaction and completing work to a high standard.
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Latest review:
Extensions- 30 Oct 2020
David and his team were excellent from start to finish work carried out to a high standard and helped communicate what needed to be done. Would highly recommend. 5*

4.4

Top rated Extension Builders

Our Extension Builders in Chelmsford, are rated 4.4 out of 5 based on 9 reviews from customers like you.

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

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 Chelmsford 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 Chelmsford who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in Chelmsford?

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

Find extension builders in Chelmsford with MyBuilder

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

Step 2: Compare different extension builders in Chelmsford

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

Step 3: Hire Chelmsford extension builders with confidence

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

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

What to ask a Chelmsford extension builder before hiring?

Before hiring an extension builder in Chelmsford or extension building company in Chelmsford, 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 Chelmsford?

An extension builder in Chelmsford 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 Chelmsford 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 Chelmsford?

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 Chelmsford 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 Chelmsford 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 Chelmsford

Can an extension builder in Chelmsford help with planning permission?

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

Many Chelmsford 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 Chelmsford help with materials and finishes?

Yes, most extension builders in Chelmsford 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.