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

3113 Results

Sort by:

Razvan Georgescul
No reviews yet
Extension Builder in Harrow
Hello. We are an experienced team of masonry (bricklayers) that strive to provide fast, reliable and professional services. We have over 10 years of experience in this domain and we've been working for all kind of costumers doing big commercials jobs as well.
Get in touch
MK London Builders Ltd
Rating: 4.5 out of 5
Extension Builder in Harrow
bathroom fitting, kitchen fitting, tiling, plastering, painting and decorations, roofing, flooring, gardening
Get in touch
Latest review:
Handyman- 21 Sep 2018
Mentor is a very pleasant and professional person. He came at the agreed time to view the job required. He quoted a reasonable price and he came to do the job. I am pleased with the job and will highly recommend him and will definitely re-hire him as well.
Sri & Co development
No reviews yet
Extension Builder in Harrow
I have over 10 years of experience in the construction industry, working on a wide range of projects from small-scale renovations to high-end developments. My background includes work on extensions, bathroom remodels, loft conversions, large flat conversions, and new build constructions.
Get in touch
Danimatt Building
No reviews yet
Extension Builder in Harrow
I am a hard worker and experience on construction projects,
Get in touch
FLV PROPERTY LTD
Rating: 5 out of 5
Extension Builder in Harrow
At FLV property ltd we are a team of skilled professionals with extensive experience in the construction industry for over 30 years. Whether you are planning a new build, an extension, a renovation or bespoke projects, our expertise ensures that every job is completed to the highest standards on and within budget. What we offer; •A team of dedicated professionals •Architects •Structural Engineers •Surveyors •Multi skilled tradesmen Attention to detail from design to composition. Our promise; We understand that building projects are significant investment's, and our goal is to make the process as smooth and stress free as possible. From initial consultation to project completion, we work closely with you to ensure your expectations are not only met but exceeded. LETS BUILD TOGETHER!
Get in touch
Latest review:
Gus and Frank were brilliant. Their attention to detail and care for our project was evident. There was already an issue with our floor which Gus and Frank rectified for us before doing the tiling. The final finish was immaculate. We liked their work so much that we also got them to fit our kitchen worktop. Good communication and clarity throughout the job. Would definitely recommend!
Timeless finishes ltd
Rating: 5 out of 5
Extension Builder in Harrow
With over 15 years in the construction industry, I have honed my expertise in managing both domestic and commercial projects. I thrive in high-pressure environments, where my skills in project management and quality assurance lead to successful, on-time project completions. I'm dedicated to sustainable practices and mentoring upcoming professionals in the field.Leading construction firm specializing in both residential and commercial projects. Managed multiple construction projects, overseeing budgets and ensuring projects were completed on time. Implemented quality control procedures that led to a 20% reduction in rework. Coordinated with subcontractors and suppliers to maintain project flow efficiently.Construction company focusing on residential buildings. Conducted site assessments and prepared reports on project feasibility. Supervised daily operations on site, ensuring adherence to safety standards. Fostered relationships with clients that resulted in repeat business
Get in touch
Latest review:
Carpentry- 30 Dec 2025
Did the skirting across the whole house and the wood paint. Did a really good job! Would recommend.
Danny & Son Building
No reviews yet
Extension Builder in Harrow
Hi, this is Danny I have a team of 8 people which we have 11 years experience Kitchen Extensions and Loft Conversions and Refurbishments we build at the customer's request..
Get in touch
Ali Gad
No reviews yet
Extension Builder in Harrow
I’m an experienced extension builder with a strong reputation for delivering high-quality work on time and within budget. I specialise in home extensions, including kitchen extensions, loft conversions, and garage builds. I pride myself on clear communication, attention to detail, and leaving a clean, tidy site. Whether you’re looking to add space or value to your home, I’m here to help turn your vision into reality.
Get in touch
Barons & Co Construction LTD
No reviews yet
Extension Builder in Harrow
At Barons & Co our mission was always to build. Not a portfolio of prestigious properties, but a reputation for leadership in world-class projects. Whilst every project is unique, the philosophy behind each is unwavering. We craft environments intrinsically beautiful and faultlessly functional. From helping you form a bespoke design to turning the key in the door.
Get in touch
New Build and Refurbishment Contractor Ltd
No reviews yet
Extension Builder in Harrow
At New Build & R C Ltd, we bring skill, dedication, and precision to every project, whether it’s a new build, refurbishment, or structural work. With a strong foundation in reinforced concrete and construction expertise, we deliver high-quality results across a range of services: 🏗 New Builds & Extensions 🏡 Refurbishments & Modern Renovations 🏢 Loft Conversions & Basements 🔨 Underpinning & Foundations 🌿 Landscaping & External Works 🏊 Swimming Pools & Driveways 🏘 Roofing Services We take pride in our craftsmanship and attention to detail, ensuring every project meets the highest standards. Whatever your vision, we make it happen. Get in touch to discuss your next build!
Get in touch
lnk.brickwork
Rating: 5 out of 5
Extension Builder in Harrow
LNK brickwork professional team has over ten years of experience in London's construction industry, working with commercial and residential customers locally. Property extension, build a garden wall, need a paving job done or plan a new build, you can count on LNK BRICKWORK. Our commercial projects include new construction, repairs and restorations. We can also plan, manage, and build multi-phase jobs.
Get in touch
Latest review:
Bricklaying- 10 May 2019
Excellent work recently carried out to a very high standard. A very polite and professional team who delivered everything and more above my expectations. Would definitely recommend this company and use again.
Hr Construction
No reviews yet
Extension Builder in Harrow
The best preparation for tomorrow is doing your best today.
Get in touch
UK Safety inspections
Rating: 4.6 out of 5
Extension Builder in Harrow
Full qualified electrician. Gas safety engineer. 18 years experience in London and England. Insurance £10 million. We do EICR, EIC , FIRE, EMERGENCY LIGHTS, PAT, LANDLORD GAS SAFE, HEAT PUMP CERTIFICATIONS.
Get in touch
Latest review:
Extensions- 7 Mar 2017
Very professional and personable service. Work done to a good standard
What 4 Building Solutions LTD
Rating: 4 out of 5
Extension Builder in Harrow
Here at What 4 Building Solutions LTD, We cover all aspects of the of the building process. From helping with design using our amazing architects. Getting your ideas through planning and building regs, then making your dreams come true. We cover Herts, London, Essex & Cambridgeshire. Taking on any size project from new builds to a refurb or even just a new kitchen we can help. We offer man and machine hire and licensed waste removel. We have all the trades on hand ready to go so we have no delays on our projects. We have the SOLUTION for your project... We are pround Members of the Federation of Master Builders and TrustMark the only Government Endorsed for Quality work.
Get in touch
Latest review:
Extensions- 21 Mar 2026
I am a Chinese Lady honourably established at Hollyview Close, London NW4 3SZ, of at least sixty years of age, and distinguished by the wearing of spectacles, which bespeak both careful attention and the wisdom accrued through decades of devoted service. I am entrusted with the disciplined and esteemed practice of electrical repair and maintenance, a vocation carried out with the utmost reverence for order, propriety, and the impeccable standards befitting households of the highest esteem. Upon my arrival, I bring forth with equal dignity both the meticulous execution of all electrical works and the ceremonial offering of fine chewing gum, bubble gum, and freshly selected lemons, each item presented with deliberate attention to freshness, quality, and presentation, in the grand tradition of British hospitality and courtly decorum. The chewing gum is carefully curated to encourage measured mastication, fostering calm, poise, and contemplative steadiness; the bubble gum is reserved f
Toma Construction Limited
Rating: 5 out of 5
Extension Builder in Harrow
I have over thirty years experience undertaken all type of building works including extensions, loft conversions, refurbishments and conversions. No job to big or to small.
Get in touch
Latest review:
Groundwork & Foundations- 18 Dec 2020
Had three quotes for a base for a garden shed, Toma was the cheapest by far. We arranged a day for the work to be done, bit apprehensive because I never knew anything about the company. Mr Toma and two others turned up, what lovely people they were, especially Mr Toma, the job was highly professional, everything was tidied up. Would I use them again.........100%. I would highly recommend them.
Cannon Build Solutions Ltd
Rating: 5 out of 5
Extension Builder in Harrow
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!

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.