Extension Builders in Northamptonshire

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.5 (4 reviews)

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Some of our top rated extension builders in Northamptonshire

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Steve Willis
Rating: 5 out of 5
Extension Builder in Northamptonshire
I have been a stonemason, (mastermason) for 33 years and I love my job. From garden walls to extensions. I Will quote any job big or small. I have done lots of work for the english heritage all over the country I have worked for reputable companies in northamptonshire and all my work is guaranteed. Competitive quotes on stonework, general building and maintenance jobs, roof repairs, chimneys also carried out.
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Latest review:
Repointing- 16 Jun 2026
Excellent job, early starter 8:00 start. Never known a builder start before 9am. New engineering bricks as original bricks were not fit for purpose.
PH Design & Build Ltd
Rating: 5 out of 5
Extension Builder in Northamptonshire
With over 15 years construction experience working on traditional and timber frame construction development's, we have recently set up a new construction company PH Design&Build Ltd in 2021 to establish and grow a quality assured, right first time application to general domestic renovations or home improvements, extensions and new build projects.
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Latest review:
Bathroom Fitting- 13 Mar 2022
Paul came to quote on an ensuite which he said was not possible after a number of assessments. I made Paul aware of works I planned for the garden and bathroom and a few other bits. If you went someone that is; consistent, timely, has defined cost (regular has updates on costs and possible variances), honest, good quality finish, then Paul is your guy. Our bathroom is to a very high standard with a very detailed finish across all areas With regards to the garden. It was like a swap, no drainage and just clay. Paul came up with a detailed plan as to how he would resolve it, which he did. Communication 10 Time 10 Quality 10 Pricing 10 Consistency 10 Personality 10 It's a shame my builder doesn't allow pictures to be uploaded....
Arcc services ltd
Rating: 5 out of 5
Extension Builder in Northamptonshire
ARCC Electrical Services is a friendly and reliable electrical company who consider no job as too big or too small. Based in Milton Keynes, our team of qualified, professional electricians have over 5 years of experience in the industry. We consistently offer value and quality to commercial and domestic customers and pride ourselves on the positive feedback that we get from our many satisfied customers.
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Latest review:
Carpentry- 17 Sep 2025
Justin did a good job. Very mead and tidy. Thank you very much.
JA Brickwork
Rating: 4.8 out of 5
Extension Builder in Northamptonshire
we are a small company based in Milton Keynes We also undertake extensions / general building works undertakern.... Public liability assured.. City and guilds assured.. Neat and tidy friendly company's.... Health n safety certificate blue card bricklayers credentials card
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Latest review:
Bricklaying- 12 Feb 2026
I hired JA Landscaping and Brickwork to build a garden retaining wall and complete patio tiling. Unfortunately, my experience with John (Jay) was very disappointing. The work was left unfinished, and the site was left in a very poor condition; even my front driveway is fully messed up with 8-10tons of waste. Despite claiming over 25–30 years of experience, the work was not properly assessed or managed, even though he was already working on a retaining wall next to the patio project at the same property and location. Although John refunded the waste removal charges £450, even that didnt covering full waste removal, the remaining unfinished and corrective work is costing me approximately 40% more than originally planned. This has made the overall project financially difficult and stressful. Based on my experience, I would not recommend this company, particularly for medium to large projects over £1k, as I do not feel they are capable of handling larger jobs professionally.
Nexus.RGT Limited
Rating: 5 out of 5
Extension Builder in Northamptonshire
7 year experience!
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Latest review:
Repointing- 13 Oct 2023
V prompt communication. Did exactly what they said that they would do. All good.
MG Home Improvements
Rating: 4.5 out of 5
Extension Builder in Northamptonshire
MG Home Improvements is a trusted, local carpentry and home improvement business based in Kettering, covering Northamptonshire and surrounding areas within a 40-mile radius. With over 40 years of experience, we specialise in kitchen fitting, internal doors, stair repairs, skirting, and all aspects of carpentry work. Whether it’s a full kitchen installation or smaller jobs around the home, we take pride in delivering high-quality workmanship with attention to detail and a reliable, friendly service. No shortcuts—just solid, dependable work you can trust.
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Latest review:
Kitchen Fitting- 24 Jun 2026
Replaced work tops. Friendly, good comminication. Arrived when he said, job completed efficiently and very pleased with outcome
Mark Kirtland Building Services
Rating: 5 out of 5
Extension Builder in Northamptonshire
I'm a local builder with over 25 years experience. I offer a complete range of building services from garden walls/Patios to larger projects like extensions,renovations,conversions.
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Latest review:
Extensions- 16 Oct 2018
Mark completed a two room single story extension to our 19thC barn conversion and assisted with preparation work for a kitchen installation. He is professional, reliable & easy to work with and the quality of his workmanship is excellent. We are delighted with the end result and I would not hesitate to recommend his services.
Welland Vale contractors
Rating: 5 out of 5
Extension Builder in Northamptonshire
I specialise in brick and stone masonry. Undertake any type of building work from new build, to renovations and alterations. Have 41 years experience working in various contracts for church restoration to loft conversions.
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Latest review:
Conversions - General- 9 Mar 2024
Good service throughout from the quotation to the conclusion of the work. Mark was organised, helpful and very knowledgable. We are very pleased with the results.
M.C Plastering
Rating: 5 out of 5
Extension Builder in Northamptonshire
Plasterer with 10 year experience.
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Latest review:
Plastering- 27 Oct 2020
We're very happy with the finished job. Makles arrived on time and got on with the job very efficiently. To our eyes, the ceiling finish looks very good and such an improvement over the original Artex. Recommended, and would hire again.
Hepworth Garden + Property Services
Rating: 4.6 out of 5
Extension Builder in Northamptonshire
Hepworth Garden and Property Services deliver high quality landscaping services throughout the Kettering and Northamptonshire surrounding areas. We work closely with both domestic and commercial clients to create the perfect garden space. Using our knowledge and skills we can advise and direct you towards the best products and most suitable materials to suit your needs, create maximum visual impact and carry out work to suit your budget.
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Latest review:
Landscaping- 2 Sep 2025
Tom did an amazing job, From start to finish has been a great help in getting the area sorted with some tricky work involved, Boards put down and protected every area possible, 11/10 work and service provided, actually booked in again for more work as we were so happy with what’s been achieved in a small time, again, would recommend to everyone!
B.Eales building contractors
No reviews yet
Extension Builder in Northamptonshire
B.Eales building contractors offer a professional, polite and reliable service who like to work one on one with the client, to ensure they get the highest possible standard for the job in hand. We have over 12 years+ experience in the trade that we love doing, brickwork, stonework, slabbing, Extentions, renovations and much more Free quotes and advice
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M SUSANS BUILDING LTD
No reviews yet
Extension Builder in Northamptonshire
A well established builder with over 50 years experience in house building, extensions, all builds. A hardworking team working in the residential and commercial sectors. Happy to manage complete build projects. Please look at my Facebook page to see our works. We work mainly in Northamptonshire and surrounding counties, Leicestershire, Bedfordshire etc. Get in touch.
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Mayor Brickwork Ltd
Rating: 5 out of 5
Extension Builder in Northamptonshire
We are a professional construction company with over 10 years of experience specialising in new builds, extensions, loft conversions, brickwork, and structural shell works. We provide high-quality workmanship for both residential and commercial projects, delivering reliable labour and material packages tailored to our clients’ needs. Our team is skilled, hardworking, and committed to completing projects to a high standard while working within deadlines and maintaining a clean and safe working environment. We also work in line with NHBC standards and hold business insurance for peace of mind. Our services include: New Builds Extensions Loft Conversions Brickwork & Blockwork Retaining Walls Stonework Repointing Roofing & Structural Works General Maintenance We pride ourselves on professionalism, attention to detail, and building long-term relationships with our clients through trust and quality results.
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Latest review:
Repointing- 20 Nov 2025
Everything went great, the brickwork was replaced and painted so it looks the same as the rest.
Andrei Zabet
New on MyBuilder
Extension Builder in Northamptonshire
At A.Z Civils Ltd, we take pride in delivering high-quality groundworks and landscaping services with attention to detail and a reliable approach. We specialise in: * Driveways * Block paving * Drainage * Foundations * Turfing & garden transformations * General groundworks Whether it’s a small garden project or a larger groundwork job, we aim to provide clean, professional work completed to a high standard.
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RJ Construction
No reviews yet
Extension Builder in Northamptonshire
RJ Construction Design.Build.Maintain . For more than 30 years we have provided a comprehensive Building , Maintenance and Hard Landscaping service in and around Northamptonshire, In addition we have featured on Kirstie & Phils Love it or List it on Channel 4. We have constructed everything from New Build houses and extensions to cellar and loft conversions during our 30 plus years, we also supply and fit kitchens and bathrooms.
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LSTAR CONSTRUCTION LTD
Rating: 5 out of 5
Extension Builder in Northamptonshire
From the first brick to the final detail – we turn your vision into reality.
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Latest review:
When I was looking for quotes, Lukasz was the only builder who provided a fully detailed breakdown. From the start, he was professional and punctual, arriving exactly on time for our first meeting. He offered great recommendations on the best ways to approach the refurbishment and was flexible enough to let me source my own materials. Most importantly, he provides a warranty which he has already honored to fix a minor fault from another professional. It has been a pleasure trusting Lukasz and his team with my full house renovation.

4.5

Top rated Extension Builders

Our Extension Builders in Northamptonshire, are rated 4.5 out of 5 based on 4 reviews from customers like you.

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What types of services are offered by local extension builders in Northamptonshire?

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

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

What are the hourly rates of extension builders in Northamptonshire?

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

Find extension builders in Northamptonshire with MyBuilder

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

Step 2: Compare different extension builders in Northamptonshire

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

Step 3: Hire Northamptonshire extension builders with confidence

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

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

What to ask a Northamptonshire extension builder before hiring?

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

An extension builder in Northamptonshire 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 Northamptonshire 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 Northamptonshire?

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 Northamptonshire 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 Northamptonshire 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 Northamptonshire

Can an extension builder in Northamptonshire help with planning permission?

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

Many Northamptonshire 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 Northamptonshire help with materials and finishes?

Yes, most extension builders in Northamptonshire 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.