Extension Builders in Harrow, Greater London

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.9 (16 reviews)

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

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, Greater London

3200 Results

Sort by:

Eagle Plastering And Home Improvements Ltd
Rating: 5 out of 5
Extension Builder in Harrow, Greater London
We're a small, local building company. We take a lot of pride in our work and the care we take of our clients. Jobs large and small, from fitting a new W.C., extensions, refurbishing or renovating your home, we especially love working on listed buildings.
Get in touch
Latest review:
Bathroom Fitting- 17 Jan 2020
Really good experience with Mark and his team. Really nice guys that have done a great job in a timely manner and to a high standard. Would definitely recommend. Was not just a bathroom fitting but gutting and renovating living room and master bedroom too.
D Tuley Carpentry And Building
No reviews yet
Extension Builder in Harrow, Greater London
Hello there! Look no further, because our team at D Tuley Carpentry And Building is here to make it happen! With 35 years of experience in the industry, we pride ourselves on being a trusted and reliable building company dedicated to bringing your dreams to life. What sets us apart is our commitment to creativity and innovation. Our team of skilled carpenters, craftsman, and builders work closely with you to understand your vision and create a space that reflects your style and personality.
Get in touch
JC Bricklaying And Building Contractors
No reviews yet
Extension Builder in Harrow, Greater London
I started my business in 1997 as a bricklayer/builder. I am highly experienced in all aspects of building as i have been in the industry for 32 years. I carry out extensions, roofing, carpentry, structural steel alterations, driveways, patios, garden walls, landscaping and any other works.
Get in touch
Dignity LC Services Ltd
No reviews yet
Extension Builder in Harrow, Greater London
I have been running my own building and construction business for approx 30 years, with over 35 years of industry experience. I am a fully skilled carpenter by trade but have vast amounts of knowledge and experience in all aspects of building and construction works. The work I undertake includes domestic building; extensions, conversions, kitchens and bathroom, disabled adaptations.
Get in touch
Tori construction Ltd
No reviews yet
Extension Builder in Harrow, Greater London
Plastering and rendering Al types
Get in touch
Rumahn International
No reviews yet
Extension Builder in Harrow, Greater London
With over 35 years of experience in the building industry, we offer a complete A–Z service across all trades — from builders, carpenters, fitters, and bricklayers to electricians, plumbers, and more. Whether it’s a minor repair or a major development project, we provide trusted professionals for every job. At Mazmo, we pride ourselves on delivering exceptional service, reliability, and peace of mind. Our “one-stop shop” approach means you don’t need to look elsewhere — we handle everything under one roof. Quality workmanship. Proven expertise. All in one place.
Get in touch
Fatema housing Ltd
No reviews yet
Extension Builder in Harrow, Greater London
We are a reliable and skilled building company based in London, delivering high-quality construction and renovation services. We specialise in residential and commercial projects, including refurbishments, extensions, maintenance, and general building work. Our team is committed to providing excellent workmanship, attention to detail, and completing every project on time and within budget. We take pride in clear communication, honest pricing, and building long-term relationships with our clients. No job is too big or small — we approach every project with the same level of professionalism and care to ensure customer satisfaction
Get in touch
Scw Brickwork
No reviews yet
Extension Builder in Harrow, Greater London
I am a bricklayer with 20yrs experience. I undertake anything brickwork related. New builds, extensions, conservatory’s, repointing, alterations, repairs and garden walls.
Get in touch
D H S HOUSING LTD
No reviews yet
Extension Builder in Harrow, Greater London
Hi my name is David I run this business in which I work a long side other, we are a very hard working team that bring out the best quailly in whatever we do to improve home and to fulfil our customers needed in there home improvement I take great proide in my job and commitments in everthing I do
Get in touch
Rg building & landscape services ltd
No reviews yet
Extension Builder in Harrow, Greater London
Builder/landscaper Combined 35 years experience Trading standards approved Marshall’s registered installer FMB member Trust mark approved All building and landscaping works undertaken.
Get in touch
Antlers Plumbing
No reviews yet
Extension Builder in Harrow, Greater London
Experienced, friendly and professional plumbing, heating and bathroom specialists from Hertfordshire. Our team of construction workers have experience in interior and exterior building works, with electricians, plumbers and carpenters on hand. No job is too big or too small. Always looking to help the community.
Get in touch
Lakeside Groundwork and demolition limited
No reviews yet
Extension Builder in Harrow, Greater London
Foundations and drainage specialists, concrete basses, underpinning, demolition, paving, driveways, fencing, turfing, tree work, and much more, we have all the plant and necessary equipment for all jobs mentioned above, and our team of skilled workmen ensures that the jobs go smoothly, and on time and budget, digger/dumper driver hire available, 0.8 ton digger and micro dumper, 1.7 ton digger with breaker, 1 ton skip loading dumper
Get in touch
SKCL Ltd
No reviews yet
Extension Builder in Harrow, Greater London
Empire building contractors offer a quality service and fantastic workmanship from my fully qualified tradesmen we offer everything from building you a house, extension or full house renovations and everything in-between. We are based in Wing, Buckinghamshire. we are fully insured and have been in business 17 years.
Get in touch
Jessieva Ltd
No reviews yet
Extension Builder in Harrow, Greater London
Recommended company on the market who does the job no matter the size.Well established company with houndreds jobs recommendations ,high valuable teams and one of the best for reacting.Trusted and recommended for small jobs(kitchen ,bathrooms refurbs),medium jobs(lofts,extensions) and bigger jobs(new builds or commercial)
Get in touch
Avi roofing ltd
No reviews yet
Extension Builder in Harrow, Greater London
I am professional roofer with over 8 years of experience in residential and commercial roofing.i specialize in installing a variety of materials,including wood structural,tiles,slat,flat roofing and steel beems. I can work any where in uk. I dont mind to travel for work. You should choose us because we are highly professional and we have our own team to finish job within short period of time and with professional finish.
Get in touch
KS builders
No reviews yet
Extension Builder in Harrow, Greater London
We can handle simple and complex jobs on time and with good price. We do all kind of jobs like painting and decorating, tiling, garden slabs, bath renovation , roofing , plumbing , electric , wood flooring , fix kitchen , skimming and maintenance etc…
Get in touch

3.9

Top rated Extension Builders

Our Extension Builders in Harrow, Greater London, are rated 3.9 out of 5 based on 16 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, Greater London?

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, Greater London 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, Greater London who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in Harrow, Greater London?

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

Find extension builders in Harrow, Greater London with MyBuilder

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

Step 2: Compare different extension builders in Harrow, Greater London

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

Step 3: Hire Harrow, Greater London extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Harrow, Greater London, 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, Greater London extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a Harrow, Greater London extension builder before hiring?

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

An extension builder in Harrow, Greater London 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, Greater London 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, Greater London?

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, Greater London 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, Greater London 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, Greater London

Can an extension builder in Harrow, Greater London help with planning permission?

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

Many Harrow, Greater London 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, Greater London help with materials and finishes?

Yes, most extension builders in Harrow, Greater London 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.