Extension Builders in Hertfordshire

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.7 (13 reviews)

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Some of our top rated extension builders in Hertfordshire

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Woodfellas carpentry
Rating: 5 out of 5
Extension Builder in Hertfordshire
Woodfellas are a fully qualified North London based carpentry company with over 10 years of experience in the trade. We have accumulated experience from carrying out a wide variety of projects covering all aspects of carpentry.
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Latest review:
Carpentry- 27 Aug 2017
Tidy & quick workers, would definitely recommend. Plus the company name makes me laugh.
CVD Constructions
Rating: 5 out of 5
Extension Builder in Hertfordshire
Hi I'm new as a solo trader with a vast experience in multiple trades I have a team of plumbers and electricians if needed.
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Latest review:
Conversions - General- 8 Oct 2022
Valentin, Dan and Chris did a great job turning an old wooden shed into a beautiful teenage den / home office. They stripped the shed down to the original wooden frame, replaced the roof and cladding, subdivided the internal space into two rooms and a small shower room. The job was reasonably priced though there was a little scope creep much of it due to additions to the original specification that resulted in an increase in price. With hindsight we should have made sure we kept track of additional work. They were friendly, tidy and considerate in the work and the dog loved having them around. They were professional and hardworking and we were pleased with the final result which was excellent value for money. We would recommend Valentin and his team and will have them back to do more work for us.
JC Group Property Sevices LTD
Rating: 5 out of 5
Extension Builder in Hertfordshire
JC Group Ltd is a reliable and experienced building company offering bathroom installations, plumbing, home extensions, and general building works. With over 30 years of combined industry experience, we take pride in delivering high-quality workmanship, clear communication, and projects completed on time and within budget. We are committed to customer satisfaction and maintaining the highest standards on every job, no matter the size.
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Latest review:
We’re absolutely delighted with the extension and the overall experience from start to finish. The workmanship is to a very high standard, and everything was completed professionally and on schedule. Communication throughout the project was excellent, and we were kept informed at every stage. The team were reliable, tidy, and respectful of our home, and the finished extension has exceeded our expectations. We wouldn’t hesitate to recommend them to anyone looking for quality work and a stress-free build.
Laurentiu
Rating: 5 out of 5
Extension Builder in Hertfordshire
I have achieved experience by working in complete house refurbishments and as a contractor for HMO council. I work as a builder and have past done full refurbishments of kitchens, bathrooms, demolishions and extensions. These include: installing and repairing pipes, drainage systems, bath, shower, sink, kitchen cabinets along with wall and floor tiling and laminate flooring. I collaborate with contractors and electricians in order to provide customers the best services. I have no reviews as I am new to this website. However, I am a highly driven builder with the ability to fix all types of problems. A hard working, enthusiastic and highly motivated individual with his own team that strives to achieve perfection in every job and task performed; with the proficiency to manage time efficiently, assess issues quickly and solving problems efficiently.
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Latest review:
Bathroom Fitting- 6 May 2024
100% recommend Laurențiu excellent quality of work and attention to the detail he done a very good job thank you.
Cc brickwork
No reviews yet
Extension Builder in Hertfordshire
Brickwork Repointing Extensions Any aspect of building
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Daniel Gagea
Rating: 5 out of 5
Extension Builder in Hertfordshire
We are onest builders, quick and reliable jobs, new on my builder but with lots of experience on the trade, looking for work, we do all kind of refurbish jobs, decorating, carpentry, basic plumbing and electric, new bathrooms or kitchens, back or loft extensions ,landscaping and much more We offer guarantee for our work. Everything seen on the pictures is 100% our work and we have loads of other pictures
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Latest review:
Daniel quoted comprehensively and clearly for both jobs that I needed, building an extension and a raised patio at the end of the garden. He worked extremely hard and diligently every day. Also he would summarise what he would do next and we discussed any changes etc and which tiles or render I preferred. I am very happy with both the patio and extension and Daniel finished everything off to an excellent standard and went above and beyond the quote. I would not hesitate to use him again and recommend him highly.
Eddy Brickwork
Rating: 5 out of 5
Extension Builder in Hertfordshire
With 10 years of experience in bricklaying, I provide top-quality craftsmanship for both residential and commercial projects. From building sturdy foundations to creating stunning brick facades, my work combines precision and durability. I take pride in delivering results that meet your exact specifications and exceed your expectations. Whether you need new construction, repairs, or custom brickwork, I'm dedicated to providing reliable and efficient service. Let's bring your vision to life with expert bricklaying skills!
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Latest review:
Bricklaying- 4 May 2026
Eddy came to do the job as arranged but unfortunately it turned out to be a much bigger job than planned. We agreed a new price and the work was completed a few days later to a very high standard. Eddy was very helpful and he and his colleagues worked hard and cleared up afterwards. Excellent job thanks.
Sean McCarthy
Rating: 5 out of 5
Extension Builder in Hertfordshire
Have been in the building trade for over 30 years specialising in building and carpentry both domestic and comercial. We cover all aspects in a building project. All are trades are skilled trades people. We have experience in full home renovations, extensions, summer houses and out buildings, ranging from ground, work brick work to final finishes.
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Latest review:
Carpentry- 26 Aug 2024
Sean was briliant and the finished job looks perfect. All through the process i felt comfortable that Sean was giving me the right information and that I was paying a fair price. He arrived , did the job, cleaned up and left our house like he'd never been there! I would recommend Sean to everyone looking for a real professional
Doyle and McAlpine Builders Ltd
Rating: 4.3 out of 5
Extension Builder in Hertfordshire
Doyle McAlpine Builders are trusted damp specialists with over 20 years of experience serving #lutonbuilders, #dunstable, #stalbans, #watford, #hemelhemstead, and surrounding villages. we handle #risingdamp, #mouldcontrol, #consendationcontrol, #roofingrepairs, #brickrepointing, and full #buildingrefurbishments. Our team works across affluent areas like #redbourne, #elstree, #shenley, #busheybuilder, and #radlettbuilder, offering expert inspections, treatments, and repairs. Fully #pca qualified, reliable and committed to high-quality work that lasts. other services. #creaminjection #dpcinjections #risingdampcontrol #waterproving #roofrepairs #wetrot #dryrot #bedfordshirebuilder #hertz #bucks
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Latest review:
Plastering- 15 Sep 2025
Nicky was a great guy. Turned up and delivered on time and did a fantastic job on the rendering on the side of the house. Very friendly and hard-working.
JR Brickwork
Rating: 5 out of 5
Extension Builder in Hertfordshire
I take on work covering all aspects of bricklaying, repointing, patio laying and any general maintenance work.
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Latest review:
Jack was punctual and professional and finished the work to a high standard. I will happily be recommending him to friends and family.
Nomarice
No reviews yet
Extension Builder in Hertfordshire
Hi, I’m Moh’d – a reliable, detail-driven construction worker, wall painter, and handyman. While I’m a registered nurse by profession, I’ve built strong hands-on experience and high proficiency in property maintenance through years of part-time work. Whether it’s transforming gardens, refreshing interiors with a clean paint finish, or handling general repairs, I bring the same care and precision to your home as I do in my clinical work. I’m friendly, punctual, and always make sure the job is done right – with quality, safety, and cleanliness as top priorities. Get in touch for a free quote or to chat about your next project!
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OTTO PAİNT AND DECOR
Rating: 5 out of 5
Extension Builder in Hertfordshire
Professional Painting Services Description How long I’ve been working I have been working as a professional painter for several years, building a strong foundation in both residential and commercial projects. Over time, I’ve developed a deep understanding of different surfaces, materials, and techniques, allowing me to deliver consistent, high-quality results. My experience and past jobs I’ve worked on a wide range of projects including interior and exterior house painting, office spaces, rental property refreshes, and renovation work. My past jobs have involved everything from small touch-ups to full property transformations. I’ve also collaborated with homeowners, landlords, and contractors, ensuring each project is completed efficiently and to a high standard. My special skills Surface preparation and repair (filling, sanding, priming) Clean, precise cutting-in and finishing Knowledge of different paint types and finishes Interior and exterior painting expertise Attention to detail and neat workmanship Why you should hire me I take pride in delivering professional results with a focus on quality, reliability, and customer satisfaction. I treat every property with respect and always aim to exceed expectations.
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Latest review:
Landscaping- 8 Jun 2026
What a great guy. Otto came saw the project and started work. Everything he said was going to to he did. Always punctual and clean. Very professional. Highly recommended.
Andrei Socaci
Rating: 5 out of 5
Extension Builder in Hertfordshire
Reliable, responsible and self motivated person with experience in the building industry. It will be a pleasure to undertake your work.
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Latest review:
Hard Flooring- 19 Jan 2026
Great job in replacing the flooring. The floor looks good and he was efficient, reliable and cleaned up well after
GpmBrickwork ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
GpmBrickwork Ltd Extension garden walls all types of Brickwork Patios Chimney repairs New builds
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Latest review:
Bricklaying- 8 May 2026
Gordon was amazing. He came within a few days on a weekend to repair the steps as they were dangerous. He did a great job, also repairing loose brickwork on a wall at no extra charge. Very reasonable price too. I can recommend him and will definitely contact him again for brickwork jobs.
WOODLEY RAY LTD
Rating: 5 out of 5
Extension Builder in Hertfordshire
Woodley Ray was formed early this year by David Ray and Sam Woodley, both expirenced in all forms of construction for over 15 years. Mainly concentrating on domestic extentions, alterations and loft conversions. With already several happy customers happy to provide references. A limited company, VAT registered.
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Latest review:
Committed to delivering great work, and being a successful construction business owner. Strives to grow and get better at what they do there work is excellent. Had work completed both internal and external over a few years would highly recommend Woodley Ray Ltd they are very reliable & extremely professional.
K build
Rating: 4.4 out of 5
Extension Builder in Hertfordshire
About Us With over 25 years of experience in the UK construction industry, our team provides a full range of high-quality building services for homes and properties across Luton and surrounding areas. We specialise in all aspects of domestic plasterwork, painting, plasterboarding, stud walls, carpentry, bathrooms, kitchens, extensions, roofing, and driveways — handling every stage of the project with care and precision. We pride ourselves on our attention to detail, cleanliness, and reliability. Our goal is to deliver outstanding workmanship at fair and reasonable prices, ensuring every customer is completely satisfied with the results. No job is too big or too small — all types of building work are undertaken with the same dedication and professionalism.
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Latest review:
Plastering- 15 Aug 2022
Skimming job completed quickly but now that decorations have started the painters are picking up ripples in some of the walls that rushed.

3.7

Top rated Extension Builders

Our Extension Builders in Hertfordshire, are rated 3.7 out of 5 based on 13 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.