Extension Builders in Hertfordshire

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

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

Select a service

How it works

Post your job for free

Tell us about your job, and we’ll alert suitable tradespeople in your area. It’s simple and free.

Tradespeople respond

Once your job is posted, you’ll get responses from interested tradespeople through the website.

Review profiles and choose

Browse profiles, work history, and feedback, then choose who you wish to share your details with.

Some of our top rated extension builders in Hertfordshire

1778 Results

Sort by:

Nick's Authentic Carpentry and Building
Rating: 5 out of 5
Extension Builder in Hertfordshire
We're a new company but have the experience and knowledge of any other company.We're professional, organised, and give our customers what they expect and deserve. Being proud workers and undertaking everything thats thrown at us, Our focus is the job we're on!
Get in touch
Latest review:
Carpentry- 31 Aug 2011
Highly recommended and friendly carpenter. The job was done within 24 hours of posting. He gave me a time and even called to say he was on his way. Price was very reasonable indeed. Job was done to my total satisfaction with 100% professionalism. I am certainly going to have Nick do any other jobs that arise. He clearly has a vast knowledge of a whole range of trades and skills apart from carpentry. It is so nice to have found such an able tradesman who can be trusted to do a great job.
LandMarx Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
Small friendly family run business with over 30 years construction and refurbishment experience. We offer all types of building services wether it is a small maintenance job to a new build . We work on commercial and residential buildings. We also provide project management for self-builders who want to keep to a budget and have someone with the expertise to guide them through the building process from conception to finish. We are CHAS accredited and DBS checked.
Get in touch
Latest review:
Keith has helped design and fit our kitchen/utility room. Has re felted the flat roof on my garage and extension. He is currently fitting all my doors, skirtings and door linings. He boarded up and plastered doors where we have removed cupboards and larders. Great job, very reliable and multi trade so i would highly recommend him. I'm an electrician so work with a lot of builders so i can recognise a good workman.
Urwin services
No reviews yet
Extension Builder in Hertfordshire
We are a driveway clearance and demolition specialist, all aspects of clearance and demolition undertaken, competitive rates clean and efficient working in home counties and north London
Get in touch
Feras
Rating: 5 out of 5
Extension Builder in Hertfordshire
High quality
Get in touch
Latest review:
Painting & Decorating- 25 Feb 2026
Good job, excellent painting and clean and tidy
JDL Construction
Rating: 5 out of 5
Extension Builder in Hertfordshire
JDL Construction Limited are a Hertfordshire based building company offering both domestic and commercial services. We specialise in all aspects of construction including Home Extensions, New Builds, Garage Conversions as well as specialist Brickwork Contractors. Our company is fully insured and our tradesman are all fully qualified. JDL are members of many trade associations including Constructionline, CHAS, Federation of Master Builders and Federation of Small Businesses.
Get in touch
Latest review:
The project was to construct a 15m2 extension to our rear lounge on the ground floor plus a 4m2 extension to the bathroom on the first floor. This involved foundations, walls and roof tiling in addition to the installation of a 5m long RSJ to support the first floor bedroom. Jamie was selected because of his recent training and apparent enthusiasm. He planned and carried out the work very well. Problems when encountered were discussed and resolved with professionalism and enthusiasm. The resulting work has been completed to a high standard and I am well satisfied with the result. The time taken was as planned, he worked on a daily rate which was to my budget. Jamie' strengths are a good basic knowledge of the building regulations, good communication skills with other workers, suppliers and inspectors and excellent basic brick laying skills with a eye for dimensional regularity and excellent final appearance. I would strongly recommend this young and enthusiastic tradesman for any similar project work involving use of his excellent bricklaying skills.
P Jordan and Sons Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
Jordan & Sons are a family run business with over 30 years experience specialising in extensions, new builds, all types of groundwork, drainage, brickwork, driveways, patios, resin bound & block paving. The work we carry out is second to none, finished to a high standard while providing an excellent service. We own our own plant with relevant tickets, & we take on all commercial and domestic projects.
Get in touch
Latest review:
Extensions- 10 Mar 2025
Hired paul to carry out works to open up my rear wall and install a new RSJ steel beam for a bifold door. From day one paul helped me out with some issues i was having with my structural engineer design, priced up the works which was very competitive with other builders and While having a visit before works started, i asked paul if he could do some extra works (installation of plasterboard walls and plastering) which he was happy to do. Todd then started works within a few days. Now all the works are finished and im very happy with the finished product. Paul and Todd were brilliant and would happily recommend them to people if they need any works done. I will be using them again in the future.
ABL Building & plumbing solutions
Rating: 5 out of 5
Extension Builder in Hertfordshire
We are a family run business, take pride in our work we carry out. We cover all aspects of building works from hanging a door to a complete new build house.
Get in touch
Latest review:
Plumbing- 28 Jun 2023
Alan was a total professional, clean and tidy, fabulous job, will use him again and recommend him to everyone I know. Top professional.
My Craft Building Solutions Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
My Craft Building Solutions Limited are a family run business, and we offer all aspects of building services. No job too big or too small with a lot of our work done for Anglian home improvements we understand the importance of customer care We specialise in: Extensions Conversions Porches Bricklaying
Get in touch
Latest review:
Groundwork & Foundations- 27 Sep 2023
A team of 3 bothers, nice guys and did a good job. maybe a little over priced but I did agree the price before, so really I cannot complain.
CPK Building & Maintenance
No reviews yet
Extension Builder in Hertfordshire
Hi, I'm chris from CPK building & maintenance we are a small building company, we take on all kinds of building and maintenance jobs offering a great affordable service. Over 15 years experience.
Get in touch
Pat Mcgeough
Rating: 4.9 out of 5
Extension Builder in Hertfordshire
McGeough & Sons Ltd is a family run business based in Bedfordshire. I am a time served carpenter with 27 years extensive experience in all aspects of refurbishments and building. Fully insured, contact us for a non obligated quote or advice
Get in touch
Latest review:
Conversions - General- 4 Jan 2026
Pat was a pleasure to deal with from beginning to end he had everything covered and made the whole project a seamless experience. He provided me with a professional quote and had the patience to deal with my questions. He started the project on time svd no thing was too much trouble, when I needed a roofer to fix some issues with a leak he had someone on the job within a day. He handled every aspect of my garage conversion effortlessly and had the job finished on time right before Xmas. Would 100% use Pat again. Great guy who also knows good trades people. Thanks Pat.
DJ Cox Building Services Ltd
No reviews yet
Extension Builder in Hertfordshire
All building work, extensions, loft conversions, electrics, plumbing, plastering, bricklaying, patios, drives, bathroom & kitchen fitting, fencing.
Get in touch
Johnstones Property Services
Rating: 4.4 out of 5
Extension Builder in Hertfordshire
25 years experience in the building trade. Running my own business for 15 years. More than just decorators; I have a team who can complete a variety of building related tasks. We specialise in complete property refurbishments and are a proud member of the The Guild of Mastercraftsman.
Get in touch
Latest review:
Extensions- 27 May 2021
Very professional service. Extremely happy with the finished result. Polite and friendly builders and admin team. Would definitely recommend and I'll be using these guys again in the future. Thanks again.
BARNETTS BESPOKE
Rating: 5 out of 5
Extension Builder in Hertfordshire
At Barnetts-bespoke we specialise in high quality custom carpentry and building solutions tailored to your unique needs, proudly serving all areas of Hertfordshire and London we offer high end craftsmanship for a wide range of projects including bespoke wardrobes, kitchens, bespoke storage solutions, and complete renovations Our complete list of services are listed below *kitchens *bathrooms *extensions * bespoke wardrobes/cabinetry *roofing *flooring * summerhouses * Returbishments * new build
Get in touch
Latest review:
Carpentry- 11 May 2020
Charlie was absolutely brilliant, fist class tradesmen with extremely high standards Will definitely use and recomend to others
Aston Brickwork
Rating: 5 out of 5
Extension Builder in Hertfordshire
My name is Sean Aston I have been a bricklayer for 6 years now. I have all kinds of experience, from working on a large construction site to smaller jobs such as extensions ,porch's and garden walls. Any and all tradesmen I use will be full qualified I also have all relevant insurance .
Get in touch
Latest review:
Bricklaying- 30 May 2019
Sean was on time and very polite at all times. He completed the work very efficiently with no disruption whatsoever. He went out of his way to make sure the job was completed to our satisfaction. He cleared up afterwards and left the site very tidy. We would happily recommend Sean.
AMT Property Solutions
Rating: 5 out of 5
Extension Builder in Hertfordshire
I have spent 40 years in the construction industry, starting straight from school where I completed a five-year apprenticeship in the glass and glazing industry. Over the years, I progressed through all areas of the window and fenestration sector, gaining extensive hands-on experience in all types of glazing, window systems, fire doors, conservatories, and associated installation works. As my career developed, I broadened my expertise further by moving into carpentry and developing practical skills in a range of additional trades, including brickwork, tiling, kitchen fitting, and general building works, to name a few. This diverse background allows me to offer a well-rounded understanding of both specialist and general construction projects. We operate throughout Bedfordshire, Hertfordshire, Northamptonshire, and Oxfordshire, including all surrounding areas.
Get in touch
Latest review:
Decking- 25 May 2026
All as planned
OFIX Ltd
Rating: 5 out of 5
Extension Builder in Hertfordshire
With over 34 years experience I offer a complete design and build package as well as providing specific services for smaller contracts. I have been vetted by the Federation of Master Builders and strive to provide excellence. I am an extremely competent multi trader with a good eye for detail. With a team of experienced subcontractors I will deliver incredible quality installations on time within budget.
Get in touch
Latest review:
Carpentry- 8 Mar 2025
Absolutely over the moon with Mike, he did a fabulous job. Would definitely recommend him!

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.

Quality screening

Easily find verified local tradespeople. Just post your job to get quotes from tradespeople near you across the UK.

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.