Extension Builders in Harpenden

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.3 (10 reviews)

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Some of our top rated extension builders in Harpenden

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SS Carpentry
Rating: 5 out of 5
Extension Builder in Harpenden
I have done jobs from shelving to roofing.I have a good job knowledge and I have ran big site. I have been a carpenter for 6 year and normally do first fix work but I can do second fix , kitchen fixing and plasterboard. I have all the tools to do the jobs with.
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Latest review:
Carpentry- 28 Aug 2018
Steve is punctual, easy to work with, hard working with all the skills, knowledge and experience to efficiently produce a successful result- replacing old floorboards and removing squeaks in steps- recommended and known from this job alone.
Plasterer
Rating: 5 out of 5
Extension Builder in Harpenden
With over 9 years experience and a real focus on customer satisfaction, our team of experienced professionals will produce a smooth finish every time on your walls and ceilings. We also do all aspects of rendering and EWI SISTEM (external wall insulation ). Always on time and on budget.
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Latest review:
Insulation- 5 Sep 2024
Fantastic work by Andrei, Ciprian and their team. Highly skilled and hard working team, starting on time (8am) every day and working until late, clear communication as the job was progressing, clear and fair pricing, attentive to details, and happy to accommodate non-standard request like 100mm EWI. Highly recommended!
Perfect Install LTD
Rating: 5 out of 5
Extension Builder in Harpenden
Perfect Install is an refurbishment and extensions specialist with 6 years experience in the building industry, doing all kind of projects, from small bathrooms refurbishments up to full house refurbishment including wall demolishing and building, flooring fitting, tiling, full kitchen design and fit and high quality painting. We do have in house authorised electricians and gas certified plumber. We have a history of projects started as small parts of a big project which end up with us doing the entire project at customer request. We are working in an 30 miles radius from Watford and we did projects in the medium to high luxury part of the building industry, including residential, commercial and public institutions. We offer to our customers an hassle free experience, getting involved in planning, sourcing the materials and advising regarding the local regulations. All our work is backed by an insured warranty which give our customers the peace of mind that the project is done at the highest level of quality.
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Latest review:
Handyman- 28 Mar 2025
Amazing job, at a very fair price. The people who did the installation came prepared and were friendly, he even brought a laser to make sure the tilea were leveled.
D Bird carpentry and building LTD
Rating: 5 out of 5
Extension Builder in Harpenden
Hi were Dbird Carpentry & Building we are a family run company by myself Daniel and my brother Ellis. We take pride and love what we do! We will help you every step of the way through your project no matter the size.
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Latest review:
Conversions - General- 21 Jun 2022
D Bird Carpentry completed the works on time and to a high standard. Dan and his team were a pleasure to work with and I would be happy to work with them again.
Ashridge Developments
No reviews yet
Extension Builder in Harpenden
I started in the trade at 17 labouring on my father on his building sites and learning from many skilled trades. I’ve worked for a few local builders since but 5 years ago went out with my father again and we have been doing so ever since. For the last 3 years we have been working mainly in north London. Have recently started taking on local work again as well due to demand for skilled and reliable trades locally.
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Circle Construction Ltd
Rating: 5 out of 5
Extension Builder in Harpenden
….………. Circle Construction Ltd is an established building company based in Hemel Hempstead, covering all residential construction works in Hertfordshire, Bedfordshire and all surrounding counties. Specialities are bricklaying (14 years experience), extensions, new builds, loft conversions, landscaping and groundwork’s.
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Latest review:
Landscaping- 4 Oct 2020
Jack did our patio and front path and we couldn't be happier. He is very positive and enthusiastic and kept us up to date with the process from beginning to end. He prices jobs very reasonably. We will definitely use him again.
360Build Solutions Ltd
Rating: 5 out of 5
Extension Builder in Harpenden
360Build Solutions Ltd - specialised in Extensions (single or double storey), Conversions - Loft, Garage, Full Refurbishments including Kitchens, Bathrooms, Home Cinema and complete New Builds - Home Office, Gym. We deliver top quality of work and we always look at many options to come to the most logical and profitable solutions for our clients and to build long and lasting relationships. Free site visits and Estimates - learn more about us in About...
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Latest review:
Extensions- 17 Nov 2019
Marius is the best builder ever! I can not recommend Marius enough, if he can do your job I would bite his arm off! He and his team are hard working, efficient and tidy. Nothing was too much trouble, the job barely ran over schedule and I now have the most fabulous new home! This is the way building work should be done!!
BAPM LIMITED
No reviews yet
Extension Builder in Harpenden
A complete building service all under one roof. Taking the hassle and stress away from you. We are specialists in extensions, new builds and full refurbishments. Undertaking all trade skills
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imsbuilders
Rating: 5 out of 5
Extension Builder in Harpenden
I have over 40 years of experience in the industry. I am a fully qualified bricklayer and also a fully qualified carpenter. I have had the pleasure of constructing many extensions new builds and home renovations for my clients, ensuring the whole project runs smoothly and safely
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Latest review:
Carpentry- 28 Apr 2024
Great experience. Bill was very nice, knowledgable and quickly fixed an issue with our unsupported floorboards, for excellent value too. Would definitely recommend!
JR Brickwork
Rating: 5 out of 5
Extension Builder in Harpenden
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.
crimson kite construction
No reviews yet
Extension Builder in Harpenden
Fully experienced, impeccable attention to detail. Able provide a design service or complete a project to architect specifications.
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m j m builders
Rating: 5 out of 5
Extension Builder in Harpenden
We do most types of building work also resin drives all types of landscaping. I have worked in construction since leaving school, I have been working foreman for firms also contracts manager for a firm specialising in care homes and I am now 53 years old.
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Latest review:
Extensions- 18 Jan 2020
In October 2018, I asked Michael to do a rear part single storey part double storey extension. Michael completed the job mid January 2019, which also included relaying the patio, fitting a pre-bought kitchen and building a new porch. Michael, Bill (the electrician) and the rest of the team have done an excellent job transforming our home into something so much more than it was. I was very impressed with his work ethic and his knowledge, and appreciated the advice he gave us which showed his experience. The electrician also was able to successfully rewire our home to bring up to the required standards and was willing to work on weekends to get the job done (that was partly our fault, sorry!). Any issues and disputes, of which there were very few mind you, were dealt with promptly and properly. All in all, if you're looking for a trustworthy, high quality builder in the Hitchin/Letchworth area then do get in touch with Michael. Thanks again for the excellent work! Also, if you'd like to see his completed work, please drop me a message and you're welcome to come and have a look at the work that was done.
B & M Home Improvement
Rating: 5 out of 5
Extension Builder in Harpenden
We are a local and reliable Plumbing, gas safe and Home Improvement Company in London and surrounding areas.I gained my experience working in the Plumbing and gas department. No matter whether you require help with plumbing, power flushing, boiler installation, bathroom, kitchen, extention, flooring we take on all building work. We provide a full interior decorating service for domestic and commercial.
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Latest review:
Extensions- 10 Apr 2014
Max and Bob completed the extension on time and within budget. There were no hidden extras and despite Bob being on holiday for two weeks, Max worked hard and lon. The extension is 6m x 5m. There were issues with Building Control which Max sorted out and did everything to meet their requirements. The extension is built to a high standard, kitchen cabinets fitted well, tiling very good and we are pleased with the quality of their work. We are using B&M again as we are confident that although they are not tghe cheapest, the quality of their work is of a high standard. Besides, it is always a pleasure to deal with Max who is a gentleman, patient and listens to what is required.
Eddy Brickwork
Rating: 5 out of 5
Extension Builder in Harpenden
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- 20 Jun 2026
Eddy was very professional. The work was completed on time and on budget. He did a fabulous job and left everything clean and tidy. He was respectful of my property and if I need work done in future I will be happy to use Eddy again.
BARNETTS BESPOKE
Rating: 5 out of 5
Extension Builder in Harpenden
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
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Latest review:
Carpentry- 11 May 2020
Charlie was absolutely brilliant, fist class tradesmen with extremely high standards Will definitely use and recomend to others
Byott and Attfield construction
No reviews yet
Extension Builder in Harpenden
We are a fully qualified experienced team of all trades, carpentry, bricklaying. We offer the full building package from hanging doors to new builds.
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3.3

Top rated Extension Builders

Our Extension Builders in Harpenden, are rated 3.3 out of 5 based on 10 reviews from customers like you.

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

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

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

What are the hourly rates of extension builders in Harpenden?

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

Find extension builders in Harpenden with MyBuilder

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

Step 2: Compare different extension builders in Harpenden

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

Step 3: Hire Harpenden extension builders with confidence

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

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

What to ask a Harpenden extension builder before hiring?

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

An extension builder in Harpenden 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 Harpenden 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 Harpenden?

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 Harpenden 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 Harpenden 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 Harpenden

Can an extension builder in Harpenden help with planning permission?

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

Many Harpenden 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 Harpenden help with materials and finishes?

Yes, most extension builders in Harpenden 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.