Extension builders in Hertfordshire

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.6 (18 reviews)

Easily find verified Hertfordshire Extension Builders. Just post your job to get quotes from MyBuilder's Extension Builders in Hertfordshire.

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Some of our top rated extension builders in Hertfordshire

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Balham construction Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
Balham construction are a London based refurbishment and construction company that offer a wide range of services from full Property refurbishment to extensions and loft conversions and everything in between
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Latest review:
Tom and the team completed a full renovation of my flat. This included refurbishment of my kitchen, bathroom and general redecoration. The team were extremely hardworking and punctual and no job was too difficult for them. I would highly recommend their services.
Co.35 Limited
New on MyBuilder
Extension Builder in Hertfordshire
CO.35 | Design-led Renovation & Refurbishment CO.35 is a London-based design and refurbishment company helping homeowners improve, renovate and transform their properties. Combining professional backgrounds in interior architecture, civil engineering and construction project management, with experience dating back to 2019, we offer a practical, design-led approach to residential refurbishment. Our services range from individual room improvements and kitchen and bathroom renovations to comprehensive property refurbishments, covering everything from initial planning and design development to construction, specialist trades and finishing works. Based in North London, we undertake projects across Greater London, bringing design understanding and technical expertise together throughout the process. We believe a successful renovation should be thoughtfully designed, carefully executed and clearly communicated. Whether you're updating a single room or refurbishing an entire property, our aim is to deliver a result that works beautifully and practically for your home. Design • Deliver • Maintain
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N. G. IONITA
No reviews yet
Extension Builder in Hertfordshire
With over 13 years in the trade undertaking all sorts of works from ground works to roof works we have been shifting throughout all the works that involves building a house, yet we might not have achieved the best knowledge in plumbing and electricity be rest assured that we can still provide advice, accommodate and protect other peoples work in your project.
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SUN GROUP CONSTRUCTION LTD
No reviews yet
Extension Builder in Hertfordshire
Sun-Construction is a construction company that performs a wide range of services: from property maintenance to extensions. We work in London and its surrounding areas.
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Daniel Copil
Rating: 5 out of 5
Extension Builder in Hertfordshire
Hello everyone, we are proud problem solving builders who covers all areas of building works: extensions, kitchens, bathrooms, painting and decorating, tiling, flooring, plumbing, electrics, carpentry, gardening, fencing, bricklaying, paving... Everything you need in one team for your peace of mind!
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Latest review:
Tiling- 16 Jun 2026
Daniel is a hardworking, precise and clean worker. He worked tirelessly for a week, doing a fantastic job with everything we asked of him: we now have freshly painted walls, new carpets and a completely refurbished bathroom! He’s on time, polite, keeps noise to a minimum and he’s very pleasant to have a chat with too. I’ve already recommended him to my close circle very gladly.
ALEX’S ELECTRICAL CREW LIMITED
No reviews yet
Extension Builder in Hertfordshire
We specialize in external rendering, providing durable and weather-resistant finishes that protect and enhance properties. Our services cover traditional and modern rendering systems, delivering smooth, stylish, and long-lasting results. With a commitment to quality and reliability, we help transform exteriors into strong, attractive, and energy-efficient spaces.
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Ivaan Roofing Solutions Ltd
New on MyBuilder
Extension Builder in Hertfordshire
Best quality roofworks and timberworks in your budget and you will get work guarantee as well. See you at your house job😊
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Bogdan Chitoiu
No reviews yet
Extension Builder in Hertfordshire
Our client our master
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TJ Elite Building Services LTD
Rating: 5 out of 5
Extension Builder in Hertfordshire
We have a team of qualified builders, electricians, plumbers, roofers to mention a few covering all aspects the building services we offer. Accumulating over 10 years of experience, covering all requirements of our customers, we aim to deliver a high quality service for your requirements We can provide all aspects of job to be covered from start to finish, from drawing plans, approval to the high quality finish of the job.
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Latest review:
Diligent, professional and finished job to a high standard. Only needed flooring done in all rooms but after seeing the quality of work, had further work carried out in gardens front and back. Have had no issues since and hes the one family goes to for any jobs that need doing, as know work gets done and we can trust that it will be of high standard.
Mario Services
Rating: 5 out of 5
Extension Builder in Hertfordshire
Mario & Alex Construction LTD specialise in construction and building services, complete property refurbishment, house extensions and loft conversions. Provides unmatched customer service. Our commitment to small,hudge integrity, providing the highest value and satisfied customers, has been the ingredient that has fueled our growth from the beginning. We ensure that all our work is professionally managed so that the result is of outstanding quality, cost-effective.
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Latest review:
Bathroom Fitting- 20 Jan 2023
We highly recommend Mario & his team. They fitted a new kitchen & bathroom to a really high standard within a short, timeframe. They work hard, are friendly, professional & honest, my neighbour even commented on how considerate they were! Upon first meeting Mario we were impressed by how organised he was. He arrived on time with the description we’d posted on my builder & went through it methodically. We had A LOT of questions! He answered all of them & didn’t rush us. We received a competitive quote within a day as promised. It included everything we discussed & he quickly answered our follow up questions. We wanted an accurate idea of the cost of electrical work & Mario arranged for his electrician to come & inspect/quote before we’d appointed Mario the job. Our kitchen & bathroom is complicated, with lots of difficult angles. Damp, unlevel floor, unlevel windows, a low ceiling were uncovered in the bathroom. Mario did well to identify solutions, giving us expert advice. Pipes were neatly chased into the wall. Underfloor heating & LVT, tiling, grouting & painting all done to a very professional finish. He kept us informed of progress, checked our preferences & was patient when we had supply delays, finding ways to ensure the job finished on time enabling us to move from our temporary accommodation back home in time for Christmas. He promptly fixed some minor issues after the job finished. We highly recommend Mario & would use him again.
Trend House Design limited
Rating: 5 out of 5
Extension Builder in Hertfordshire
Trend House Design limited offer independent carpentry and joinery 1&2, fix with certification NVQ LEVEL 3 specialise on refurbishments and high end floors over 9 years experience. We are proud to offer our advice reliable and friendly service within the South West London area.
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Latest review:
Joinery & Cabinet Making- 26 Jun 2024
Absolutely great service. The media was built exactly how we wanted. Nicolae would use his expertise to guide us and improve our design where appropriate. The end result was a unique and difficult to make arch media wall with integrated electrics and lighting
Jass
Rating: 5 out of 5
Extension Builder in Hertfordshire
We do all kind of staircase with fill finishing, Roofs Structure, Roof Tiles , installing doors , Flooring and other construction work.
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Latest review:
Carpentry- 1 Jul 2026
Jass was quick to respond and gave a good price for fabricating a staircase on site. Jass made sure I was happy before leaving and readjusted one of the steps which was creaking.
Lita construction ltd
Rating: 4.7 out of 5
Extension Builder in Hertfordshire
All kinds of work,Framework,Basments,groundworks, refurbishment, extension,lots years experience in this field predominantly working on housing developments of different sizes.
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Latest review:
Groundwork & Foundations- 1 Apr 2024
Concrete job
Avion Homes Limited
Rating: 5 out of 5
Extension Builder in Hertfordshire
Avion Homes Limited specialises in residential new builds, extensions, refurbishments, and bespoke self-build projects across Essex, West Kent, and surrounding areas. With years of experience managing residential developments for major nationwide housebuilders, we deliver high-quality construction with a strong focus on workmanship, organisation, and reliability from start to finish. Our services include: • Residential New Builds • Property Extensions • House Refurbishments • Self-Build Projects • Construction Management As an FMB member and TrustMark registered company, we are committed to delivering professional, compliant, and well-managed construction projects for homeowners, investors, and developers.
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Coinscope construction
Rating: 4.4 out of 5
Extension Builder in Hertfordshire
Hello I'm Adrian I'm a young, hardworking builder With good skills Always giving affordable prices Get in touch if interested thanks
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Latest review:
Fencing- 5 Jun 2021
Really good work and a very friendly service. Thanks guys!
Elite Renovations
Rating: 5 out of 5
Extension Builder in Hertfordshire
We are a well experienced team of tradesmen from bricklayers to plasterers and roofers. We undertake works in all areas of the building industry and pride ourselves on our professionalism, work ethic and customer service. All of our contracts are bespoke to the customers needs and requirements with no upfront payments, we will build 50% of your project before any payment is made.
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Latest review:
I had a new boundary wall built. I am very pleased with the professionalism and politeness of the tradesman. The wall looks great and I am very happy. Thank you

4.6

Top rated Extension Builders

Our Extension Builders in Hertfordshire, are rated 4.6 out of 5 based on 18 reviews from customers like you.

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

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

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

What are the hourly rates of extension builders in Hertfordshire?

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

Find extension builders in Hertfordshire with MyBuilder

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

Step 2: Compare different extension builders in Hertfordshire

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

Step 3: Hire Hertfordshire extension builders with confidence

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

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

What to ask a Hertfordshire extension builder before hiring?

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

An extension builder in Hertfordshire 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 Hertfordshire 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 Hertfordshire?

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 Hertfordshire 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 Hertfordshire 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 Hertfordshire

Can an extension builder in Hertfordshire help with planning permission?

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

Many Hertfordshire 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 Hertfordshire help with materials and finishes?

Yes, most extension builders in Hertfordshire 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.