Extension Builders in Watford

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

2574 Results

Sort by:

Km Building Specialists Ltd
Rating: 3 out of 5
Extension Builder in Watford
KM Building Specialists is dynamically developing company created by people with passion. Our mission is professional advice, meeting expectations and, as a result, obtaining satisfaction of all our clients. We work closely with various construction specialists (electricians, gas-safety experts, architects, garden designers) to enable us to deliver the top class service and to ensure that the safety building regulations and codes of practice are followed.
Get in touch
Latest review:
A single storey extension. Bedroom chimney place knocked down. Patio to the rear. Marek was very hardworking, professional and tidy. He was at my home every day and alway very early and always worked until late to get the job done
Kassa Property Development U.K Ltd
Rating: 5 out of 5
Extension Builder in Watford
We are willing to engage from small to large projects, aiming to provide trade personnel in the top 5% of their speciality. We aim to provide what the client wants. with our recommendations as oppose to our personal opinions, in order to provide end satisfaction.
Get in touch
Latest review:
Bricklaying- 16 Aug 2018
Gebre is a punctual, courteous, hardworking individual who knows a great deal about his skill. He helped me in choosing the material. And started work promptly the next day on time. Moreover, he works in a neat orderly manner that impressed my neighbours. I strongly recommend him.
Seaton-Robinson construction limited
No reviews yet
Extension Builder in Watford
Seaton-Robinson construction limited I'm a builder with 30 years experience I have a team who work for me ( plumbers,eletriction, carpenters ,all trades. We do all aspects of building works from small extensions ,loft conversions ,double storey extensions and total refurbishments. We can do all aspects of work on the building site even down to the decorating.
Get in touch
Pcx tiles limited
No reviews yet
Extension Builder in Watford
PCX Construction , based in London, is your trusted partner for all construction and renovation needs. We not only handle the fitting and construction work, but also provide a wide range of high-quality materials including tiles, carpets, kitchens, laminate, vinyl, and other building materials. Whether you're purchasing materials from us or want us to manage both the supply and installation, we've got you covered. Contact us today or send a WhatsApp message for bookings and quotes. Let us bring your vision to life with the best service at the best prices.
Get in touch
A S Builders
Rating: 5 out of 5
Extension Builder in Watford
We are a family run business in construction industry since 1990, initially started by my father and now his sons have joined the business and looking to revitalised the business through the use of up-to-date technology. We undertake all types of building work through our team of skilled labour from a small job up to New Build. Our most recent job was conversion of a detached property to 7 HMO's.
Get in touch
Latest review:
Extensions- 29 Apr 2026
Heera, Jagthar and team was my first personal experience with builders. Let me tell you, it was a pleasure to have them do our porch and other renovations in the house. They are so courteous, hard working and provided a great service. Firstly, I had a comprehensively written quote breaking down all of the steps required. Heera then ensured to keep me in the loop of any developments/any changes of plan required, outlining the reasons why and options, making it easy to understand and work together to completion. Their finish was to a high quality and they would always go the extra step to ensure this. I highly recommend AS Builders for any job and will definitely use them again in the future, and would recommend to my friends and family also. If you are considering them, grab a free quote and go from there... That's what I did! Thank you AS Builders for our renovations!
Gary prime
Rating: 4.5 out of 5
Extension Builder in Watford
I have been actively involved in the construction industry for the past seven years, during this time I have gained experience in ground works, bricklaying and a variety of other trades and in the last two years I have been working in a supervisory role. I have worked on large construction sites as well as carrying out works on property refurbishments.
Get in touch
Latest review:
Groundwork & Foundations- 14 Aug 2019
Gary did an excellent job on the drainage, everything I asked of him. He was punctual and polite, wouldn't hesitate to hire him again.
Cannon Build Solutions Ltd
Rating: 5 out of 5
Extension Builder in Watford
As a family run business which has been in the building trade since 1864. We offer free no obligation quotations and consultations. A high quality, reasonably priced service, offering expert knowledge and advice.
Get in touch
Latest review:
Loft Conversion- 4 Mar 2020
Tom has provided a really excellent service throughout the job. He gave us a number of quotes as we changed and refined our plans and he made some really helpful suggestions about how best to proceed. I was very impressed with his project management, I always felt that I was kept up to date with the progress of the job. The quality of work from Tom and his team has been great and we even completed a week ahead of schedule!
Newline Building Solutions Ltd
Rating: 5 out of 5
Extension Builder in Watford
Newline Building Solutions Ltd has been trading for over 10 years. We undertake all works including bathroom renovations, extensions and loft conversions. We have very good references throughout Greater London, including Schools, Offices and Residential clients. We take all measures to deliver our projects on time and within budget. We have a long list of associates which allows us to deliver projects from design to completion.
Get in touch
Latest review:
The job involved stripping out existing kitchen and downstairs bathroom and fitting new ones as well as knocking down stud walks to create an open plan living space. We were very happy with the quality of the work and it was completed on time with no additional costs. Overall we are very happy with the work and wouldn't hesitate to use Emile again for any future work we do.
Athwal Constructions Ltd
Rating: 5 out of 5
Extension Builder in Watford
Hi its jaswinder Singh. working as a soletrader since 2013 i have been working in this trade since 2003 i have done loft conversions , rear and side double extentions , full house renovations etc.20 years of experience in this trade.
Get in touch
Latest review:
Athwal we’re fantastic in their work for us - reliable, very high standard of workmanship, on budget, efficient, courteous.
JMG Brickwork
Rating: 5 out of 5
Extension Builder in Watford
Fully qualified bricklayer with 16 yrs+experience in bricklaying,I don’t just work on my builder, my main work is for builders in my area and word of mouth recommendations. free quotes for local areas. All Bricklaying works undertaken from new build, extensions, garden walls,porches,anyting with bricks and blocks! Also repairs and repointing from birds beak,bucket handle and weather struck my aim is always to deliver a high quality finish and to the customer’s satisfaction!! please contact for a free quote ,,!!
Get in touch
Latest review:
Bricklaying- 8 Jun 2024
Joe had come to our property to fix the wall. He had done an excellent job and redid the wall to a high standard. He left the area clean and tidy. We strongly recommend getting in contact with Joe for any bricklaying work. Great Job Joe!!
J M HARJI CONSTRUCTION LIMITED
No reviews yet
Extension Builder in Watford
J M Harji Construction Ltd is a reliable and experienced building company specialising in high-quality residential and commercial construction. We handle everything from extensions, refurbishments, and renovations to new builds and structural work. Our skilled team takes pride in delivering excellent workmanship, clear communication, and projects completed on time and within budget. Whether you’re improving your home or starting a new project, you can count on us for professional service and outstanding results.
Get in touch
A-tech Building Services Ltd
Rating: 5 out of 5
Extension Builder in Watford
We are a dynamic and profesional construction company, with a vast experience over the last decade and more, offering high quality build at a very competitive price always in mind with the latest legislation in safety and durability.
Get in touch
Latest review:
Bathroom Fitting- 7 Nov 2025
Amazing work done by Antonel and his colleagues! The job was done to a very high quality standard and they were very thoughtful towards my needs always keeping good communication from the start of the process. Antonel promised me a very tight deadline of 5 days and he made sure this was met, always ensuring the job was done to a very high standard, I couldn’t have asked for more. Definitely someone I would recommend to anyone.
Ava Constructions & Decors
Rating: 4.9 out of 5
Extension Builder in Watford
Ava Constructions & Decors Ltd is a UK-based construction and renovation company committed to delivering top-quality craftsmanship and reliable project management. We specialise in full refurbishments, extensions, bathroom and kitchen installations, and commercial fit-outs — always tailored to the client’s vision and delivered to the highest UK building standards. With a keen focus on transparency, timelines, and customer satisfaction, Ava Constructions has earned the trust of homeowners, investors, and developers alike. Punctuality and completion of work on time are a priority .Our team always respect the client wishes and work with them to achieve the best possible results to their satisfaction. Thank you in advance
Get in touch
Latest review:
Extensions- 16 Apr 2026
I would not recommend this builder based on my experience. Instead of using crushed concrete they used soil to fill the house flooring for underfloor heating. 1 The project suffered from poor communication, repeated delays, and a lack of clarity around responsibilities. There were serious issues with the foundation works, which failed Building Control inspection and now require remedial engineering input before works can proceed. The site was also left incomplete and not in an acceptable condition. Despite substantial payments being made, key documentation, technical responses, and follow-through were lacking, leaving me to resolve major compliance and structural issues independently. My experience has resulted in delay, additional cost, and considerable stress. I would strongly advise others to ensure there is a detailed written contract, clear scope of works, and defined accountability
Basil Brothers
Rating: 5 out of 5
Extension Builder in Watford
We are an experienced team formed of two brothers who have 15 years experience in building and interior and exterior renovations. We have experience working both in the UK and across Europe. We have a good track record of quality work and we can provide UK references on request.
Get in touch
Latest review:
Extensions- 14 Apr 2019
These guys have done an incredible job with my extension. They are professional and friendly and I can't fault them once in three weeks! They not only completed the job quickly, but without cutting any corners either. I wish more builders had this level of care and work ethic!
Joe-Mac Constructions Ltd
Rating: 5 out of 5
Extension Builder in Watford
My passion for bricklaying started when I was a young boy watching and helping my dad who’s been my inspiration. My current experience has been on sites specializing in all types of building work and private work to always achieve a high standard and I'll settle for nothing less than perfection.
Get in touch
Latest review:
Bricklaying- 13 Nov 2021
This is the third job I’ve used Joe on and he’s been great on all three. Competitive quotes, keeps his word, and great skill and finish on the brickwork. He also happens to be a friendly guy with a good attitude.
Ceca Developments LTD
Rating: 5 out of 5
Extension Builder in Watford
Hael Construction Ltd, a proud member of the Federation of master builders, is a trusted construction company based in North London, delivering high-quality building services across the region. We specialise in new builds, extensions, loft conversions, renovations, groundworks, electrical installations, and plumbing. With a skilled team of qualified tradespeople and experienced project managers, we provide a complete service from design to completion. Our focus is on quality workmanship, transparent communication, and delivering projects on time and within budget.
Get in touch
Latest review:
Extensions- 23 May 2022
Ceca Developments have done an outstanding work on our side and rear extension project, and we would definitely recommend this company. Firstly, they have offered a really competitive quote for the work and have been very transparent and detailed in regards to how long it will take to complete the project. Sebastjan has been a pleasure to deal with and was very helpful during the project, providing honest and useful recommendations and being available every time we needed anything. All the work has been completed to a very high standard and to the agreed timelines. We did not have to worry about anything during the whole project, which made this a very pleasant experience.

3.7

Top rated Extension Builders

Our Extension Builders in Watford, 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 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.