Extension Builders in Watford

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.5 (11 reviews)

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

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 Watford

2521 Results

Sort by:

Yes
Rating: 5 out of 5
Extension Builder in Watford
With over 10 years of experience, SD services covers every aspect of carpentry including but not limited to kitchen and bathroom renovations in London and surrounding areas. SD Homes is truly your local and friendly handyman. We will build your dream home.
Get in touch
Latest review:
I would like to say that this work was completed perfectly. They were always on time and cleaned up after themselves. The plumber was there all day and never stopped. We found them all very approachable and helpful. No pressure sales. Would gladly have them back for another job and would recommend them to others.
DUMITRU HUJA
Rating: 5 out of 5
Extension Builder in Watford
Extensions loft conversation ,refurbishment,bathroom fitting,kitchen fitting,electrical and plumbing
Get in touch
Latest review:
Kitchen Fitting- 17 Nov 2025
We recently had our kitchen refurbished by Dumitru, and we couldn’t be happier with how everything turned out. He’s one of those rare builders who combines professionalism with real care for the details. He worked efficiently, kept the place tidy throughout the project, and always cleaned up after himself — which honestly made such a difference when living through a renovation. What I appreciated most was how supportive he was when it came to choosing the right materials. He guided us through the options without ever pushing, and his advice proved spot-on. The final result is exactly what we hoped for and more. If you’re looking for someone reliable, skilled, and easy to work with, I totally recommend Dumitru P.S. For anyone curious about the scope of the work: Dumitru changed our worktop, removed the old tiles and redid the flooring with laminate, installed a new cooker and hob, fitted a new sink, repaired the walls after the new boiler went in, and repainted everything. Top work
Aiscon ltd
New on MyBuilder
Extension Builder in Watford
I was previously self employed builder for over 20yrs. The last 10 yrs I worked as a Construction Project Manager on various sites, specialising in Grd works & RC frames. Managing all H&S, programs etc
Get in touch
Phi Architectural Services Ltd.
Rating: 5 out of 5
Extension Builder in Watford
Phi Architectural Services Ltd. specializes in providing architectural, structural and project management services from small to big sized residential projects. With more than 12 years of experience and more than 500 projects ranging from refurbishment to new build houses and flats, the firm also have its own team of sub-consultants and contractors.
Get in touch
Latest review:
CAD / Drawings- 6 Mar 2022
Very helpful architect. Needed a little nudge occasionally due to busy season, but the work is delivered in time and to a high standard. I'm happy with the result.
KG DESIGN & BUILD LTD
Rating: 5 out of 5
Extension Builder in Watford
Hi I`m Kleida .I worked in Building industry for a while now and I have built a quite a knowledge on extensions loft conversion and refurbishment . I recently decided to start working for myself .I also have a very good working team with various knowledge on various stages of projects .
Get in touch
Latest review:
Conversions - General- 8 Oct 2025
Gaz and his team were professional and hard working, and clear about what would happen when. The job is now finished to a good standard, and on time.
U & A Builder
Rating: 4.9 out of 5
Extension Builder in Watford
We've been ground-workers for over 16 years now and we've got lots of experience. We specialise in many aspects such as groundwork, driveways, landscape gardening, underpinning, paving, foundations, extensions, fencing and general building work. Our jobs have a warranty and also guarantee to complete all jobs to a high standard.
Get in touch
Latest review:
Landscaping- 19 Mar 2024
Completely professional from start to finish. Urim and Aryam are both excellent communicators, which made a huge difference in planning the drainage for our patio, and rebuilding our front steps. We had every confidence in them from the outset and they fulfilled all our expectations. A great team!
ALMO Property Group Limited
Rating: 5 out of 5
Extension Builder in Watford
ALMO Property Group delivers comprehensive property services, from maintenance and renovations to consultancy and management, with efficiency, expertise, and attention to detail. Backed by experienced professionals and full insurance coverage, we provide a dependable service, clear communication, and consistently high standards on every project, with a focus on providing value for all our clients.
Get in touch
Latest review:
We recently completed a full house refurbishment including a 4-metre rear extension, dormer loft conversion, and complete interior renovation with ALMO Property Group—and I genuinely couldn’t recommend them more highly. From the very beginning, the team managed everything seamlessly, from planning and design through to execution. What could have been an incredibly stressful process was made smooth, organised, and surprisingly enjoyable thanks to their professionalism, communication, and attention to detail. The quality of workmanship throughout the project has been exceptional. Every stage was handled with care, precision, and a clear commitment to delivering a high-end finish. The team were reliable, efficient, and always kept us informed, which gave us real peace of mind. A special mention has to go to Ameer, who was absolutely outstanding from start to finish. His dedication, responsiveness, and willingness to go above and beyond made a huge difference. He was always on hand to answer questions, offer solutions, and ensure everything ran perfectly. ALMO Property Group have completely transformed our house into a beautiful home, and we are beyond happy with the results. If you’re looking for a trustworthy, skilled, and professional team, I would highly recommend them.
Sinevir Construction
Rating: 5 out of 5
Extension Builder in Watford
Sinevir Construction Ltd is a trusted construction company based near London, proudly serving the capital and surrounding areas. We specialise in residential and commercial projects, including new builds, extensions, refurbishments, and structural works. Our team of qualified professionals is committed to: High standards of workmanship Full regulatory compliance Clear and honest communication throughout every stage of the project Whether it's a small private renovation or a complex public contract, we approach each project with care, precision, and professionalism. What sets us apart: ✅ Construction Online Gold Member ✅ Skilled and experienced workforce ✅ NEBOSH-certified site safety supervision ✅ CHAS and SSIP-accredited for health & safety standards ✅ Fully insured, giving clients peace of mind ✅ Transparent pricing and realistic scheduling ✅ Respect for architectural heritage and local communities ✅ Competitive rates without compromising on quality We believe every property deserves thoughtful construction and reliable service — and at Sinevir Construction Ltd, we proudly deliver both.
Get in touch
Latest review:
Extensions- 27 Mar 2026
Ruslan was excellent at his craft. Very hard working, very clean and professional with a great attitude. Would highly recommend this company
Restora Developments LTD
Rating: 5 out of 5
Extension Builder in Watford
Hi! Here at Restora Developments we pride ourselves in having a diverse range of skills. Our bread and butter is new build homes and large developments, however we have formed a sub division aimed at end clients and home owners for smaller taks. With all in house; - carpenters - roofers - plumbers - electricians - brick layers - landscapers Etc. We take on all work from simple bathroom refurbishments to building your dream property from the ground up!
Get in touch
Latest review:
Groundwork & Foundations- 18 Feb 2022
they did for me a good job and very high standard and price wise
Vadet Construction
Rating: 5 out of 5
Extension Builder in Watford
With over 20 years of experience in the construction industry. We provide high-quality services covering everything from strip-out to brickwork, electrical, plumbing, carpentry, tiling, plastering, flooring, and painting, leaving a tidy, clean site.
Get in touch
Latest review:
Bathroom Fitting- 7 Jun 2026
We recently had our bathrooms refurbished by Vasile and his team, and we are absolutely delighted with the results. From the very beginning, they were professional, reliable, kind, and exceptionally helpful. Vasile was always available to discuss every aspect of the project, taking the time to explain things clearly and answer our questions with patience and honesty. It felt as though we had a genuine partner supporting us through the renovation of our three-bedroom flat. Vasile and his team were fully invested in achieving the best possible outcome and were always willing to go the extra mile when challenges arose. The quality of their work is outstanding. They worked efficiently, kept us informed throughout, and ensured everything was completed in a timely manner without compromising on quality. We would wholeheartedly recommend Vasile and his team to anyone looking for skilled, trustworthy, and genuinely caring professionals.
1RightConstruct
Rating: 5 out of 5
Extension Builder in Watford
Extensions and Loft conversions , General building works, Kitchens and Bathrooms but can also carry out all Electrical jobs. We take great pride in our work and we enjoy to admire the transformation of projects from the beginning to end.
Get in touch
Latest review:
Extensions- 28 Jul 2023
We recently had the pleasure of working with Marius, his skills and craftsmanship were truly outstanding! Throughout the construction process, his attention to detail was commendable. Every aspect of the project, no matter how small, was meticulously executed. Marius' expertise was evident in the precision of his work, and it was clear that he takes great pride in delivering the best possible results. Marius kept us informed at every stage, patiently explaining the progress and addressing any questions or concerns I had. This level of transparency and professionalism made the entire experience enjoyable and stress-free. Marius' dedication to quality was evident in the choice of materials he used, ensuring the durability and longevity of the finished product. He had an eye for aesthetics, ensuring that the final result not only met functional requirements but also looked stunning. Not only was Marius skilled and reliable, but he also completed the project within the agreed timeframe and budget. His efficiency and commitment to deadlines were highly commendable. In summary, I can confidently say that Marius' work is truly great. His exceptional skills, attention to detail, clear communication, and commitment to excellence made the entire construction process a delightful experience. I highly recommend Marius to anyone in need of a reliable and talented builder.
Chepine Builder
Rating: 5 out of 5
Extension Builder in Watford
We gain our reputation always completing the job with customer satisfaction and if there is something wrong, we always come back and solve the problem. We never let our customer down.
Get in touch
Latest review:
Lenko was straight-talking, gave considered advice and completed the job quickly at a reasonable price, we were very happy with the job.
General Building Services
Rating: 5 out of 5
Extension Builder in Watford
We are a team of professional tradesmen who provide quality refurbishment services in London .With over 28 years experience in our industry,we provide a comprehensive services. Your project is in safe hands. I am one of the owners of the factory kitchen furniture. Do you want to have a beautiful and very firmly floors, driveways, parking lots, terraces, balconies and other places -to bell.Performs industrial and decorative flooring company Bautech.
Get in touch
Latest review:
Damp Proofing- 14 Apr 2018
Had several quotes and different opinions on how to treat my issue. Ted was by far the most knowledgeable and gave proper advice. The job was completed properly. Timekeeping and cleanliness brilliant. I have already hired him for future work and recommended to another member of my family. Very reasonable cost wise.
ASC
Rating: 5 out of 5
Extension Builder in Watford
Plumbing & heating — full professional range ASC HEATING & PLUMBING is based in London and works across London and the surrounding areas. With 6+ years in business, we offer everything from emergency call-outs and repairs to installations, leak detection, drains, bathrooms, boilers, central heating, underfloor heating and commercial plant rooms — planned so you know scope, timescale and cost up front.
Get in touch
Latest review:
Plumbing- 1 Apr 2026
Aurel and his son did a great job, really knowledgeable and helped with a difficult job. Not only were the results fantastic but the guys were a pleasure to have around.
Caro Building Services LTD
Rating: 5 out of 5
Extension Builder in Watford
Leszek Rogowski
Get in touch
Steel Frame Systems
No reviews yet
Extension Builder in Watford
A unique building firm that specialises in Light Gauge Steel frame construction. A modern method of construction systems that meets all building regulation requirements and offers a cost effect and fast method of building for our clients. We under take work from extension to large scale developments all made from our system.
Get in touch

3.5

Top rated Extension Builders

Our Extension Builders in Watford, are rated 3.5 out of 5 based on 11 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 Watford?

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

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

What are the hourly rates of extension builders in Watford?

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

Find extension builders in Watford with MyBuilder

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

Step 2: Compare different extension builders in Watford

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

Step 3: Hire Watford extension builders with confidence

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

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

What to ask a Watford extension builder before hiring?

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

An extension builder in Watford 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 Watford 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 Watford?

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 Watford 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 Watford 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 Watford

Can an extension builder in Watford help with planning permission?

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

Many Watford 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 Watford help with materials and finishes?

Yes, most extension builders in Watford 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.