Extension Builders in Harrow

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.8 (18 reviews)

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

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 Harrow

3112 Results

Sort by:

Home Design & Build
Rating: 5 out of 5
Extension Builder in Harrow
Tooled with years of experience, we undertake design & reconfiguration of builds; adding value to your home or business. Working closely with you; we create a bespoke, quality finish within your budget & affordability. Delivering a high standard of skill & integrity of craftsmanship we are proud off
Get in touch
Latest review:
Kitchen Fitting- 24 Jun 2025
Lalli and her team were all very professional, communicative, and detail oriented helping us create a new kitchen and bathroom that we love, not to mention, on schedule! We would highly recommend Home Design and Build and hope to work with then again in the future.
A. D. Builders
Rating: 5 out of 5
Extension Builder in Harrow
Hi , I’m Aaron Davis of AD builders, I Have been in the building trade for 20 years. Orginally worked for my father in a family run business. I take a lot of pride in my work , references are available at any time. I'm a bricklayer by trade and ground worker. I have built many extensions over the years, and enjoy it now just as much as I did when I began. My work is of a very high quality , thanks for taking the time to read through my profile.
Get in touch
Latest review:
Extensions- 23 Dec 2021
We originally asked Aaron to come look at the property before we purchased to understand the possibilities of a large extension. Since that point over a year ago Aaron has worked with us in refurbishing the existing house as well as building a large wrap around extension. The core team we had on site of Aaron, Dan, Karl are hard working, they care about what they do, and they are good fun to be around. Aaron also has a broad network across all the other trades - all of which did a great job on the project. I would certainly recommend them for any work you are considering.
Rattan construction Ltd
Rating: 3.7 out of 5
Extension Builder in Harrow
Hi dear costmers we are carried out all building work and we are always try are best to make our costmers happy and satisfied thanks all in advance.
Get in touch
Latest review:
Loft Conversion- 22 Mar 2024
Glad we didn't hire him. After agreeing on a price for loft conversion and back extension, Mr Rattan kept increasing the price by referring to minor things. Like charging extra for plate that goes on steel. First day when he turned up, he demanded that owner should provide tea and snack for his labour every day. Also he was not ready to include the agreed price on the contract (as he was sub contracting the job to someone else). Glad we cancelled him and hired another builder in his place. I have evidence of all communication I had with him, incase anyone wants it. I would avoid him at all cost.
Mk&s construction ltd
Rating: 4.4 out of 5
Extension Builder in Harrow
we do refurbishment of bathroom,extensions ,tiling and kitchen . A good team which provide to customer good work in relevant frame of time .have a 10 year experience in a building field .
Get in touch
Latest review:
Bathroom Fitting- 28 Oct 2024
Not many builders want to complete a job started by someone else. They took the job and more or less completed it.... I wasn't there to supervise so there are some finishes that could have used more polish and the mirror that was hung does not feel stable. However, they did install the toilet, sink and consolidated the pipes outside.
LMVContruction LTD
Rating: 5 out of 5
Extension Builder in Harrow
With 28 years experience we are an friendly and local building company who can help with all your home improvements, whether it be a new bathroom, kitchen, plumbing job, painting and decorating or a complete refurbishment We provide a free no obligation quote We understand the need to provide top quality workmanship and great customer service, at a reasonable cost. We guarantee all our work and are covered by Public Liability Insurance.
Get in touch
Latest review:
Conversions - General- 28 Jan 2025
We were absolutely delighted with Lino and his services. He was incredibly patient , as our flat purchase was delayed. We required a total gutting off our flat, with new kitchen and bathroom, new flooring, painting, and all the rest. He had great communication throughout. He showed up on time with his team each day , and was so professional throughout. We went to Lino for advice throughout the process. He never said any of our plans were not possible- he always either said yes, or provided another option. This was such a great help. I would recommend Lino to anyone. We are absolutely delighted with our flat.
Building Project Group LTD
No reviews yet
Extension Builder in Harrow
Building Project Group Building Trust with Quality Work We'll get the job done!
Get in touch
Made Innovate Constuction & Reform
Rating: 5 out of 5
Extension Builder in Harrow
We are what we would like to call a complete construction company. Due to many years of success and co-projects, we partnered with a Structural Engineer to provide a hassle-free, top-notch service and projects. We have over 30 years of experience with a team of experts who specialize in construction management, design, and build services.
Get in touch
Latest review:
Andre undertook a seemingly impossible task within my own home. They transformed my down stairs storage in a w.c, the gas lines were repositioned, he and his tem also built an outdoor storage area. Their honesty, dedication, and commitment to finding the best solutions both in terms of cost and quality were truly exceptional, they transparently outlined the challenges and worked tirelessly to deliver results that went beyond expectations. I totally recommend Andre and his team if you are looking for a highstandard professioanal that really cares about people and getting the job done!
CC BUILDERS UK & DEVELOPMENT
Rating: 5 out of 5
Extension Builder in Harrow
CC Builders UK Development well-established company, by a professional tradesman. Our team consists of hard-working men, who are all very experienced within the industry. We take pride in our work and always aim to deliver the best possible work. We specialise in: · New Builds · Extensions · Loft Conversions · Refurbishments
Get in touch
Latest review:
Bricklaying- 29 Feb 2020
"Brilliant. Happy and satisfied. Delighted with his work." Very clean finish and polite people Thanks again for the work. xxx
Property Fair View Ltd
Rating: 5 out of 5
Extension Builder in Harrow
We Undertake all sorts of home Repair and undertake all property maintenance Works in a professional manner.
Get in touch
Latest review:
Chaudhary Mahmood & his company Property Fair view ltd ‘s team is highly dedicated & committed people. They installed my bathroom fitting job in a very organised & professional way. I would highly recommend this team.
BML Building Services
Rating: 4.9 out of 5
Extension Builder in Harrow
Very hard working and take a lot of pride in the work done and attention to detail.
Get in touch
Latest review:
Bricklaying- 20 Jul 2026
Ben was very professional , quick response, good communication , his work was great and he left the site very clear after he finished the job. I will definitely using his services again and highly recommend him to anyone who needs his services. Thank you
RA Designs and Build Ltd
Rating: 5 out of 5
Extension Builder in Harrow
We are a dynamic construction firm specialising in innovative design and high-quality building solutions for both residential and commercial projects. With a commitment to excellence and attention to detail, our team of experienced architects, engineers, and skilled tradespeople collaborates closely with clients to bring their visions to life. We prioritise sustainable practices and utilise cutting-edge technology to enhance efficiency and ensure the durability of our structures. From initial design concepts to final construction, we are dedicated to delivering projects that not only meet but exceed client expectations, creating lasting value and aesthetic appeal. Our customers consistently recommend us for our commitment to quality, attention to detail, and exceptional customer service. They appreciate our ability to turn their visions into reality while staying on schedule and within budget. Positive testimonials highlight our professionalism, seamless communication, and the collaborative approach we take throughout each project. Clients feel confident entrusting us with their building needs, knowing that we prioritise their satisfaction and work tirelessly to ensure memorable and successful outcomes.
Get in touch
Latest review:
Excellent quality of work which has not caused any problems for many years. Efficient work style whilst keeping up a high standard of work.
Florin brickwork
No reviews yet
Extension Builder in Harrow
My name is Florin, I am a qualified bricklayer with over 10 years of experience and I also deal with silicone rendering with over 15 years of experience in Italy and paving.
Get in touch
Rutba design & build ltd
Rating: 5 out of 5
Extension Builder in Harrow
I provide complete building services like loft conversion, side & rear extensions, kitchen, bathroom, plumbing, underfloor heating, electric & driveways, painting & decorating etc.
Get in touch
Latest review:
Absolutely great quality of work and outstanding service. Jagjeet and his team have done a great job without any delays. Honest and hard working. Very happy to recommend Rutba
Brando Developments Ltd
Rating: 3.7 out of 5
Extension Builder in Harrow
Brando Developments, with a solid decade of trading since its establishment in 2012, has become a trusted name in the industry. Specializing in a range of services, we proudly collaborate with local estate agents, addressing diverse needs such as maintenance issues, end-of-tenancy work, and expert painting and decorating services. Our dedicated team includes skilled professionals, including gas engineers, electricians, and roofers, ensuring that we offer comprehensive solutions for our clients. With a proven track record, we continue to provide top-notch services, making property management and development a seamless experience for our valued customers.
Get in touch
Latest review:
Bathroom Fitting- 10 Oct 2024
Really good team. The work was excellent. The only thing to comment is that the team could have finished the work faster but overall I’m happy with their work. Very involved and caring team. It felt like they were doing their own bathroom. Good price as well.
Perfect Install LTD
Rating: 5 out of 5
Extension Builder in Harrow
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.
Get in touch
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.
Hertfordshire Brickwork Limited
Rating: 5 out of 5
Extension Builder in Harrow
Hertfordshire Brickwork Limited., where quality comes first and competitively priced, too. 21 years experience constantly in that field of work. I pride myself on the outstanding quality and the great customer service I provide - that's a promise. It's one of many things I've been extremely proud of throughout my career. I also hold the highly recognised SMSTS Site Management Safety Training Scheme certificate so you can be sure everything will be well planned out safely and correctly. Kind regards, Danny Marsh
Get in touch
Latest review:
Bricklaying- 14 Mar 2016
He completed the job - really impressed - Very Polite - he worked really hard and made a fantastic path for us. Highly recommend this guy.

3.8

Top rated Extension Builders

Our Extension Builders in Harrow, are rated 3.8 out of 5 based on 18 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 Harrow?

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

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

What are the hourly rates of extension builders in Harrow?

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

Find extension builders in Harrow with MyBuilder

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

Step 2: Compare different extension builders in Harrow

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

Step 3: Hire Harrow extension builders with confidence

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

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

What to ask a Harrow extension builder before hiring?

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

An extension builder in Harrow 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 Harrow 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 Harrow?

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 Harrow 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 Harrow 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 Harrow

Can an extension builder in Harrow help with planning permission?

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

Many Harrow 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 Harrow help with materials and finishes?

Yes, most extension builders in Harrow 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.