Extension Builders in Harpenden

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.6 (12 reviews)

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Some of our top rated extension builders in Harpenden

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HD BUILDING CONSTRUCTION LTD
No reviews yet
Extension Builder in Harpenden
Hi we do all sort of building work, we do extensions loft conversion bathroom, kitchen, plumbing , electrical, Carpanter , roofing, decorating, landscape,refurbishment works .all building work undertaken. 17 years experience in building work. We provide best quality service in quick time. Quick reply and quick service. We do cover London are and surrounding areas near by.
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Bshc construction ltd
No reviews yet
Extension Builder in Harpenden
BSHC construction is a Luton based company. Our services offered include all building work, brick work, roofing, extensions, loft conversion, tiling, plumbing and heating, flooring. We cover Luton, Bedfordshire and surrounding areas and willing to travel 50 miles. We have 15 years experience is construction industry.
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Nomarice
No reviews yet
Extension Builder in Harpenden
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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EM Precision Construction
New on MyBuilder
Extension Builder in Harpenden
Professional and reliable loft conversion and carpentry specialists. We provide high-quality workmanship, honest pricing and excellent customer service. We are committed to delivering every project safely, on time and to the highest standard. Free quotes available.
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Paul
Rating: 4.8 out of 5
Extension Builder in Harpenden
Vekony paul Ltd I offer insurance for you and a good price. All the offers are negotiable fell free to discuss.
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Latest review:
Paul did an amazing job at my 3 bed, he built a shower room and toilet area downstairs from scratch and plastered and repainted the whole house with his specialist team within 2 weeks. This has been amazing as other contractors quoted between 6 weeks. I will definitely be using Paul's services in future as he sticks to the price quoted and is trustworthy
PS Brick Block &Home Improvement LTD
Rating: 4.7 out of 5
Extension Builder in Harpenden
All type of building works to high standards. - extensions - lofts - plumbing - electric - decorating - new build - patios - driveways
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Latest review:
Extensions- 4 Nov 2023
Overall me and my husband are very satisfied with the workmanship and with the final result of our my fake cladded garage door with the new aluminium framed window. The original garage was converted into a habitable room 7 years ago with only a rooflight to bring light into the room, which is now my husband's office and this new window will make a lot of difference therefore we are very happy with the finished work. The work was done very quickly, the builders turned up on time and they were very efficient and helpful, they took particular care when installing the composite slatted panels to the marine plywood. The main contractor Pawel Speiwak also came on site to inspect the works during construction. The quote was also very competetive, a good value for money. I would definetely use them again for any future work in my house and recommend them to other people.
Richard Carey
No reviews yet
Extension Builder in Harpenden
All things plumbing from maintenance to new installs. Also running small - medium refurbishment jobs completed to a high standard with a close team of sub contractors. Reliable and reasonable.
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Andrius Petkevicius
No reviews yet
Extension Builder in Harpenden
Im professional bricklayer with 20 year experience.build extension fence house is well do reporting service
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J J Kelly & Sons Ltd
No reviews yet
Extension Builder in Harpenden
J J Kelly & Sons Ltd is a distinguished family-run business nestled in the vibrant community of Round Green, proudly extending its exceptional services throughout Bedfordshire for over 35 years. As experts in the field, we specialise in a comprehensive range of trades, including building, extension building, loft conversions, garage conversions, and renovations. Our proficiency also encompasses new builds, construction, and civil engineering, making us the go-to choice for projects of any scale.
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Peach brickwork
No reviews yet
Extension Builder in Harpenden
Hertfordshire based family business with over 40 years combined experience. Specialists in extensions and new builds.
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Lighthouse Crew Limited
Rating: 5 out of 5
Extension Builder in Harpenden
We are new business on the market although we are in construction for over 20 years. We are bringing experience from projects that we were working on throughout many years of service for commercial, domestic and insurance clients. We are offering kitchen and bathroom installation, hard floor fitting, refurbishments, complete remodeling, masonry repairs and structural repairs.We are aiming at complete refurbishments, extensions and conversions, including underpinning and structural strengthening.
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Latest review:
Joinery & Cabinet Making- 28 Oct 2022
Rafal was very helpful, and came up with alternative solutions to the job too from what I'd first suggested. He was prompt, cleaned up each day, and did a really good job which I'm very happy with. It was slightly worrying not to get a confirmed price for the work beforehand, just an estimate, but it turned out that was because it was hard to tell the time the job would take, and in the end what he did charge produced a really good result. I'd highly recommend him.
Upgrade Interiors Ltd
Rating: 5 out of 5
Extension Builder in Harpenden
We’ve focused in the last 26 years, on improving our skills and how can we be better professionals. It has been a long journey, a time in which we have developed every day as professionals, to put everything in value, for the clients we have today. We believe that, when you do everything with great passion, the results will be fantastic and you can be proud of the final result.
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Latest review:
Carpentry- 17 Oct 2025
Nico did a fantastic job. The new wardrobe doors look amazing and fit perfectly after adjusting to fit the older door frames which had settled and moved slightly out of alignment over the years. Better than the original ones. The bedroom doors were replaced and fitted to open to the correct side of the rooms. The broken stair was expertly cut and fitted and matched perfectly to the rest of the stariway. Very solid and completely squeek free. Built to last a very long time. Nico is very reliable, dependable and highly skilled. I highly recommend him for any carpentry work needed.
Arlo
No reviews yet
Extension Builder in Harpenden
Our company offer these services: Landscaping Services •Paving •Driveway •Fencing •Grass •Cleaning •Drainage •Garden Repair •Concrete Base •Wooden Pergola
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Mng Roofing Ltd
Rating: 5 out of 5
Extension Builder in Harpenden
Welcome to Mng Roofing Ltd – Your Local Roofing & Building Experts With over 20 years of experience, we’ve built a reputation across London and surrounding areas for reliable, high-quality construction and roofing services. Every job is handled by our trusted in-house professionals — we’re here to protect and enhance your home with care and precision. We specialise in: 👉 New Roof Installations – flat and pitched roofs in slate, tile, felt, bitumen, and modern PVC membranes. 👉 Roof Repairs & Maintenance – from small leaks to major refurbishments. 👉 Fascias, Soffits & Guttering – installation, replacement, and professional cleaning. 👉 Garage & Extension Roofs – tailored solutions for outbuildings and home extensions. 👉 Leadwork & General Roofing Services – high-quality lead flashing, detailing, and associated building work. 👉 Extensions – full design-and-build services to increase your living space and add value to your property. 👉 Loft Conversions – transforming unused lofts into bright, functional rooms while ensuring Building Regulations compliance. 👉 Outhouses – bespoke garden buildings designed and built to suit your needs, from offices to relaxation spaces. Whether you're dealing with a leak, planning a renovation, or considering a full extension or conversion, we tailor our work to suit your property and budget. We’re proud to offer honest advice, expert craftsmanship, and guaranteed results. When you choose us for your project, you’re not only getting skilled workmanship — you’re also fully protected by comprehensive insurance cover: ✅ Employers’ Liability (£10 million): Protects our team while they work on your property. If any of our staff are injured, you’re never at risk of being held responsible. ✅ Public Liability (£5 million): Covers accidental damage or injury to third parties. For example, if a falling tile damages a neighbour’s car, you’re completely protected. ✅ Products Liability (£5 million): Ensures you’re covered if any of the materials we supply and install turn out to be faulty or cause damage. In simple terms, our insurance gives you total peace of mind: whatever happens, you’re financially protected, and your property is in safe hands. 🤝 If you're looking for a builder and roofer who values safety, quality, and customer satisfaction—let’s talk. 📞 Feel free to message me now to arrange a free site visit and no-obligation quote.
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Latest review:
We recently had Mng Roofing Ltd carry out a new flat roof installation on our property, and we couldn't be happier with the results. From the first inspection to completion, the team were professional, reliable, and kept us updated throughout the process. The workmanship was excellent, and the site was left clean and tidy, and everything was completed on time. We now have peace of mind knowing our roof is watertight and backed by a guarantee. Highly recommend Mng Roofing Ltd to anyone needing quality roofing work done.
Elezi plastering
No reviews yet
Extension Builder in Harpenden
Skimming Over skimming Wet plastering Drylining Restoration works Plaster boarding Materials Supply & installation Water damage repairs Sand and cement renders Rough cast renders Modern silicon based renders External wall insulated renders Rendering & K-Rend Pebble Dash Materials Supply & installation
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MIC STRUCTURAL SOLUTION
No reviews yet
Extension Builder in Harpenden
General Building Work, Temporary Work specialist, all type of structure specialist, extension, conversion,refurbishment.
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3.6

Top rated Extension Builders

Our Extension Builders in Harpenden, are rated 3.6 out of 5 based on 12 reviews from customers like you.

Quality screening

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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.