Extension Builders in Harrow

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

3044 Results

Sort by:

Fastbuild Ltd
No reviews yet
Extension Builder in Harrow
All type of building work under taken and new build we do extension,loft conversion,plumbing,electrical work,garage conversion,bathroom tiling, driveways and porch.
Get in touch
Ifa construction ltd
Rating: 5 out of 5
Extension Builder in Harrow
House extension, lofts conversion, house refurbished, and new build
Get in touch
Latest review:
Restoration & Refurbishment- 2 Jul 2023
AJ was thorough, friendly and thought things through. I would recommend him.
S.J Shatri Construction Limited
Rating: 5 out of 5
Extension Builder in Harrow
I believe great service comes from professionalism, attention to detail, and genuine care for customers. I’m dedicated to delivering reliable results, excellent communication, and an experience that leaves clients confident they made the right choice.
Get in touch
Japji construction limited
No reviews yet
Extension Builder in Harrow
we are passionate about creating spaces that elevate the quality of life for our clients. With years of experience in the construction industry, our team specializes in a wide range of services, from loft conversions and home extensions to kitchen and bathroom renovations, electrical and plumbing work, and even new builds. We aim to bring our client's vision to life while ensuring the highest standards of craftsmanship and attention to detail. Loft Conversions – Maximizing Space and Functionality A loft conversion can significantly increase the living space of a home, often without the need to move. At Japji Construction Limited, we work closely with our clients to design loft conversions that not only meet their needs but enhance the overall flow and functionality of their homes. Home Extensions – Expanding Your Home’s Potential Our home extension services are designed to meet the growing needs of homeowners. Whether it's adding extra bedrooms, a larger kitchen, or more living space, an extension allows families to stay in their homes while gaining the space they need. With careful planning, expert construction, and a focus on seamless integration with the existing structure. Renovations – Breathing New Life Into Existing Spaces Renovating your home is an exciting way to revitalize your living environment. Japji Construction Limited offers comprehensive renovation services that transform outdated or inefficient spaces into modern, functional areas. Whether it’s updating a single room or overhauling the entire property, our skilled team handles everything, from design to execution, ensuring that every detail aligns with the client’s vision. Kitchen and Bathroom Refurbishments – Modernizing Key Areas The kitchen and bathroom are the heart of the home, and we understand the importance of these spaces. Our kitchen and bathroom renovation services focus on combining style, functionality, and durability. Whether it's installing high-end fixtures, creating open-concept designs, or maximizing storage, we ensure that each kitchen and bathroom remodel exceeds expectations. Electrical and Plumbing Services – Safe, Reliable Solutions At Japji Construction Limited, we pride ourselves on offering comprehensive electrical and plumbing services. From wiring to rewiring, lighting installations to troubleshooting electrical faults, we handle all aspects of electrical work with safety and efficiency in mind. Our plumbing team ensures that your plumbing systems work flawlessly, from water installations to pipe repairs, guaranteeing peace of mind for our clients. New Builds – Building Your Dream Home For clients looking to build their dream home from the ground up, Japji Construction Limited is equipped to manage new builds from start to finish. We work closely with our clients to understand their vision and requirements, offering professional advice on everything from site preparation to the final touches. With a strong emphasis on quality, sustainability, and aesthetics, we ensure that every new build is a reflection of the client's aspirations. Commitment to Quality and Customer Satisfaction At Japji Construction Limited, our primary goal is to exceed our clients’ expectations. We believe in delivering the highest standard of workmanship on every project, big or small. Our team is committed to clear communication, reliability, and transparency throughout every phase of the construction process. Whether you're embarking on a home renovation or building a new house, we are here to make your construction journey smooth, stress-free, and rewarding.
Get in touch
KUBEL LTD
Rating: 5 out of 5
Extension Builder in Harrow
Welcome to KUBEL LTD, your trusted partner for all your construction and renovation needs. We specialise in building and renovating extensions, roofs, and gardens to transform your home into your dream space. With our expertise and dedication to quality, you can trust that your project will be completed on time and to your satisfaction.
Get in touch
Latest review:
Wonderful and honest. Excellent finish.
MCAF Consulting Ltd
No reviews yet
Extension Builder in Harrow
We are trusted builders in London and Berkshire with over 15 years of experience delivering exceptional results on both residential and commercial projects. Our team specialises in house extensions, loft conversions, and full property refurbishments, combining skilled craftsmanship with clear communication and professional project management. From small domestic renovations to large mansion houses, we take pride in providing a reliable, high-quality service that meets deadlines and exceeds expectations. Every project is handled with attention to detail, transparency, and respect for your home. If you’re looking for experienced, fully insured builders to transform your property, MCAF offers complete design-to-completion solutions tailored to your needs. Quality workmanship, honest pricing, and client satisfaction are at the heart of everything we do.
Get in touch
Export builders
No reviews yet
Extension Builder in Harrow
Expert Builders Saif Ltd Expert Builders Saif Ltd is a trusted and experienced construction company with over 8 years in the industry. We specialise in all aspects of building and renovation work, including house refurbishments, loft conversions, extensions, driveways, plastering, brickwork, and blockwork. Our team is committed to high-quality workmanship, professionalism, and customer satisfaction. Whether you're improving your home or starting a new build, we deliver reliable and affordable results tailored to your needs.
Get in touch
Bizy Construction Ltd
Rating: 5 out of 5
Extension Builder in Harrow
Welcome to Bizy Construction ltd, a construction company located on the western fringe of Greater London, committed to delivering an exceptional service on budget and on time. We have a dedicated team committed to delivering exceptional New Build, House Refurbishments, House Extensions, Loft and Basement Conversions to a specific budget, while ensuring we meet our clients' expectations.
Get in touch
Latest review:
Extensions- 3 May 2022
Job done by Bizy Construction Ltd, Was done to the highest standard every team member was very polite and helpful. All the work was done using in house trade person nothing was contracted out so all the work went very smoothly. New kitchen/rear extension excellent. My wife and I are very pleased with all the work done by Bizy Construction Ltd, and would use them again. We would recommend them to anyone who need a reliable building/construction company. Zied was excellent give us advice and idea as if he was a private adviser. Which we appreciate and valued I can’t praise the workmanship enough or find any thing to complain. Thank the team that work on my property.
Buildstead Development Ltd
Rating: 5 out of 5
Extension Builder in Harrow
Our team at Buildstead has over 25 years of experience in the construction industry covering a wide range of project types. We truly are your "one-stop shop" when it comes to your project. From design to build, we pride ourselves on our integrity, the quality of our work and the working relationship we enjoy with our clients. With full project management included, you will be kept up to date at each step along the way ensuring complete peace of mind.
Get in touch
Latest review:
Kitchen Fitting- 5 Nov 2020
An incredibly positive experience from start to finish. I found Robbie and team were hard workers, very likeable and provided brilliant results. Comms throughout were excellent. With Robbie happy to discuss the job over the phone beforehand and put our minds at ease. A big shout out to the team for undertaking this work during COVID. We understand the pressures this places on our tradespeople and we thank Robbie and his team for their diligence and commitment to wearing masks in our home and working safely. A brilliant experience.
First Corner Construction Ltd
No reviews yet
Extension Builder in Harrow
We are a company with decades of experience in all types of construction work, no job is too small or big! Just let us know the desired work you would like to have carried out, then we will come out and have a face to face consultation at the property and start working as soon as it is convenient for you. We are flexible and want to work with you.
Get in touch
Mannatconstruction
No reviews yet
Extension Builder in Harrow
we strive to provide 100% quality fitting bathrooms and ensuites.with over 10 years experiance in renovating bathrooms we give the customer our personal vision and provide total stress free renovation and aim to complete all projects on time as quoted in quotes. we install wet rooms and and lighting to customers preferred project,so give us a go and share your vision.
Get in touch
edildue
Rating: 5 out of 5
Extension Builder in Harrow
Groundworks, Fromwork, steel fixing, casting , general builders, carpentery , tiles , concrete , wood floor
Get in touch
Latest review:
Handyman- 6 Nov 2023
Michele and his team did an excellent job of improving the external area of our property. Very professional communication, job was done to a high standard at a fair price. Done in a very timely manner and would highly recommend.
Pawel
Rating: 5 out of 5
Extension Builder in Harrow
I am part of a dedicated two-man company with over 15 years of experience in the construction industry. We specialize in a wide range of construction projects, from extensions and loft conversions to garden transformations, as showcased in the photos below. When you choose me, you’re not just hiring a builder—you’re investing in exceptional craftsmanship, meticulous attention to detail, and a commitment to exceeding your expectations. I take great pride in my work, and my recent projects speak for themselves. I’d be delighted to share examples and even arrange visits to completed sites, where you can see the quality of my work firsthand and hear directly from satisfied clients. Your satisfaction is my priority, and I am committed to bringing your vision to life with professionalism and care. I look forward to discussing how I can help make your project a reality. Best regards,Paweł
Get in touch
Latest review:
The job was to remove a stud wall with an archway between my kitchen and hall. Pawel was excellent from start to finish. He was good to communicate with before, and answered my questions fully. He turned up on time, was very neat and kept the noise down. He did a great job and cleaned up afterwards. I’d recommend!
B&O Construction Limited
No reviews yet
Extension Builder in Harrow
B&O Construction Limited is your go-to team for all things building and renovating. We take on a variety of projects, from single and double-storey extensions to loft conversions, garage conversions, and interior makeovers. No job is too big or small — we love helping homeowners transform their spaces. We’re all about quality work and making the process smooth and hassle-free for you. Whether you want to add extra room, upgrade your loft, or give your interiors a fresh new look, we’re here to help turn your ideas into reality. Get in touch with B&O Construction Limited, let’s build something great together!
Get in touch
Platinum Star Constructions
No reviews yet
Extension Builder in Harrow
Here at Platinum Star Constructions our goal is to build and perfect your dream home to your specifications carrying out any work you desire from building extension, renovations, driveway paving, property maintenance and remodelling inside and out.
Get in touch
Plaza
No reviews yet
Extension Builder in Harrow
With over 10 years of experience in the London construction market, our company provides a wide range of professional building and renovation services. We specialise primarily in all types of tiling work — whether for bathrooms, kitchens, gardens, or outdoor areas. In addition, we handle smaller tasks such as painting, repairs, and installations, as well as full-scale plumbing, electrical work, and complete refurbishments. We take great pride in our reliability, punctuality, and the high quality of our workmanship. Every project is carried out with exceptional attention to detail, ensuring cleanliness, precision, and a solid guarantee on all completed work. I’m are always happy to offer expert advice and support throughout the renovation process, including assistance with sourcing and delivering materials needed for the job. My works covers a wide range of projects — from full bathroom renovations to flooring, kitchen upgrades, exterior work, and bricklaying. Upon request, I can also provide client recommendations from previous projects to confirm the quality of service
Get in touch

3.7

Top rated Extension Builders

Our Extension Builders in Harrow, 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 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.