Extension Builders in Cornwall

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

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 Cornwall

226 Results

Sort by:

Mtb carpentry
Rating: 5 out of 5
Extension Builder in Cornwall
Fully qualified carpenter/joiner covering all aspects of carpentry. My aim is to complete the job to the highest standard and on time .15 years of on the tools experience
Get in touch
Latest review:
Carpentry- 6 Aug 2025
Mike was quick to estimate and returned his quote in good time. He turns up when he said he would. His workmanship is very good and cleaned up any mess leaving our place very tidy. We are well pleased with the 6 new Oak doors fitted. We would have no problem in using Mikes services again.
Jackson Developments
Rating: 5 out of 5
Extension Builder in Cornwall
At Jackson Developments we have a team of highly skilled tradesmen covering all areas of building and renovations. From home improvements to full house builds, loft conversions and extensions. We deliver quality every time at a price you can afford.
Get in touch
Latest review:
Extensions- 16 Sep 2016
Simply brilliant service. Jackson's Developments formed a professional relationship from the outset and were superbly competent in every aspect of the build. The staff are a pleasure to have around, demonstrating diligence and attention to detail in every task, their level of dedication is a massive credit to their profession. We will never seek the assistance of another firm as Jackson's Development will always be top of our list. We genuinely cannot praise them enough, from planning to costings, from construction to completion, they have provided a simply brilliant service. We wholeheartedly recommend them.
EGD Renovations
Rating: 5 out of 5
Extension Builder in Cornwall
EGD Renovations was founded in 1996 and is based in Newquay, operating throughout Cornwall. We specialise in full property renovations for private clients, including extensions, structural alterations, kitchen and bathroom installations, tiling, painting & decorating, and landscaping. We handle everything except electrics, plumbing, and plastering. To provide a complete service, we work closely with trusted electricians, plumbers, and plasterers, coordinating all trades and managing your project from start to finish. In 2021, we won a Cornish Buildings Award for outstanding restoration of an historic building, demonstrating our commitment to quality craftsmanship across all types of projects.
Get in touch
Latest review:
Painting & Decorating- 15 Aug 2011
Absolutely fantastic job. Very professional from first contact to completion of the work. Reasonably priced, but the quality of the work was exceptional, with great attention to detail. Very flexible to get job completed on time, will definitely use again and can thoroughly recommend.
Lewis noble
Rating: 5 out of 5
Extension Builder in Cornwall
Hello I am Lewis a bricklayer of 14 years experience & the proud owner of NobleLandscapes, we take on .Extensions .stonework .Garden walls /retaining walls .repointing .Newbuilds .patios .sleepers .General landscaping
Get in touch
Latest review:
Bricklaying- 14 Feb 2025
Explained what I wanted and the job was well done at a very fair price. I found Lewis to be professional, friendly and polite. Won’t hesitate in asking him in the future for quotes for further work.
RJC Building & Plastering
Rating: 5 out of 5
Extension Builder in Cornwall
Hi, my name is Rich and I'm an independent builder and plasterer working all over Cornwall; I'm based in Newquay. I aim to provide a competitive and friendly service with the promise of a high quality finish. Hard working, punctual and reliable, I enjoy sharing my expertise and ideas with customers to help jobs run smoothly, and to the client's specification.
Get in touch
Latest review:
Plastering- 24 Jan 2019
Highly recommended. Richard quickly came round to price up the ceiling to be plastered. He managed to fit me in at a time which suited me. He was clean, tidy and punctual. I have already recommended him to a friend.
BBR carpentry limited
No reviews yet
Extension Builder in Cornwall
BBR Carpentry and Construction are a professional and reliable construction company covering the whole of Cornwall. Whether your looking to build your dream home or renovate/extend your current home look no further we will help you through the design, build and completion of your project.
Get in touch
DKP Groundwork & Landscaping
Rating: 5 out of 5
Extension Builder in Cornwall
We are a family run business of 20+ years who take care in every job we do. we undertake all your building and landscaping work from House extension Patio / Path Drainage Fencing Decking Stone or block walling Garden Outbuildings Turfing & More Please contact us for a free quote Many Thanks
Get in touch
Latest review:
Dan at DKP Groundworks was great from start to finish. We had a complete garden transformation. Dan took what we wanted and gave us ideas along they way to give us our dream garden. He was clear on pricing from beginning to end. Gave us the choice to order bits ourselves or let him organise orders and delivery’s. He done a real solid professional job all round. We had concrete and soil removed, drainage put in, walls built, patios laid, fencing and new turf, all done by Dan. Thanks Dan, we love our new garden 🙂
Building With Frames
Rating: 5 out of 5
Extension Builder in Cornwall
BWF build to the highest standards with environmental and energy efficient consideration at all times. New builds to extensions in the South West area, using SIPS and Timber Frame with integrated renewable technologies.
Get in touch
Latest review:
Steve built an insulated, wooden-framed workshop/studio for us in our garden. We are delighted with the final result which is attractive and well finished despite being built to a tight budget. Steve is extremely knowledgeable, experienced and professional with impressive skills both practically and as a project manager. A real strength was his ability to listen, and respond, to what we wanted. We found him flexible and considerate, keeping mess to a minimum and communicating well with us throughout. He took a pride in his work and was completely honest and trustworthy. Our project was completed on time and within budget. We would definitely ask stteve to do work for us again and would recommend him to friends.
PRENN BUILD
No reviews yet
Extension Builder in Cornwall
Local Cornish construction company, covering all aspects of building. We are a small independent building company delivering quality work to our customers. Check out our fb page for ongoing projects. Please feel free to get in touch
Get in touch
Elliot Higginson Design & Build LTD
No reviews yet
Extension Builder in Cornwall
EH Design and Build LTD: Your vision, Our expertise, One seamless process. At EH Design and Build LTD, we understand that building or renovating your dream space can be a complex and overwhelming undertaking. That’s why we’ve streamlined the entire process by offering and complete turnkey service, bringing all the essential elements under one roof. We’re not just builders, and we’re not just a design team- we’re a unique combination of both, working in perfect synergy to bring your vision to life. Our dynamic duo at the helm comprises Morgan our seasoned construction expert, and Elliot, our visionary design and management lead. With Morgan’s understanding of the building process and Elliot’s creative flair and project oversight, we ensure a seamless journey from concept to completion. What sets us apart is our ability to handle every aspect of your project in-house. From initial design concepts and planning permissions to the actual construction and finishing touches, we’ve got you covered. Whether you’re dreaming of a contemporary home extension, a stylish kitchen renovation or a complete new build, EH Design and Build Ltd is your one stop solution. Let us take the stress out of your project and turn your dream into reality.
Get in touch
MD Woodwork Needs
Rating: 5 out of 5
Extension Builder in Cornwall
Hi, we are carpentry and construction business which specialises in all aspects of a build . Based in Newquay , you can always find our work on fb page to see our work and what quality we deliver with all our work.
Get in touch
Latest review:
Hard Flooring- 17 Aug 2022
Marius and his team were very friendly, quick and professional from start to finish. I am really pleased with the job that they have done and would definitely recommend them. Thank you so much.
Luke
Rating: 5 out of 5
Extension Builder in Cornwall
All aspects of building work covered.
Get in touch
Latest review:
Carpentry- 22 Jun 2022
Good job done very pleased with Luke after fitting the bathroom door he tided up the shavings
PR Developments
Rating: 5 out of 5
Extension Builder in Cornwall
P. R.Builder groundwork s landscaping. Extensions newbuilds renovation work brick stone block work drainage plastering dry linning roofing patios all construction work undertaken .All work fully insured. References and photos if required.I have over 40years experience in construction and building problem solving and expertise to under take any problematic situations underpinning sureing and any drainage sewer problems free advice given. All work is warranteed .Very friendly and easy to work with and listen to what customers needs .Expert in drainage and water problems replace old drainage broken collapsed inspection chambers soakaways water treatment plants drainage fields. There isn't any problems the I can't overcome.
Get in touch
Latest review:
Extensions- 21 May 2025
We recently had a one storage extension built by Phill and Angel and we are extremely happy with the result. He was professional, punctual, and easy to work with from start to finish. The quality of his work is excellent, and the new extension blends in perfectly with the rest of the house. Phill kept everything tidy and on schedule, and he made sure I was happy with every part of the job. I really appreciated his attention to detail and clear communication throughout the project. I would highly recommend Phill to anyone looking for a reliable and skilled builder. Thank you again for the fantastic job!
A Richardson builders
Rating: 5 out of 5
Extension Builder in Cornwall
over 15 years experience in the building trade I specialise in all aspects of carpentry i offer a friendly service and competitive rates I am also fully insured
Get in touch
Latest review:
Carpentry- 4 Nov 2019
I had 2 new internal doors hung.Great job, really pleased with the work carried out. Very hard working, a pleasure to have in my house and cleaned up afterwards!! Would use Andy again and again.
Dan Steele
Rating: 5 out of 5
Extension Builder in Cornwall
I have been working as a carpenter In Cornwall for 24 years and I am happy to travel anywhere within a 25 mile radius of Newquay. I have worked on a range of projects from just a simple decking to the construction and management of a whole house. I have an eye for detail and pride myself on quality workmanship for a fair price.
Get in touch
Latest review:
I cannot fault Dan in any way. His work was exemplary. He was friendly, approachable and guided me through every step of the reconstruction process. He always arrived on time and went over and above what was expected of him. I trusted him and would, without question, give him my full recommendation.
D I Bridge Carpentry
Rating: 5 out of 5
Extension Builder in Cornwall
I have worked in the construction industry for 30years. I successfully completed many projects including cut roofs stairs doors kitchens bathroom and much more
Get in touch
Latest review:
Conversions - General- 11 Jun 2024
Dave did a great job will be using him again on other projects.

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

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

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

What are the hourly rates of extension builders in Cornwall?

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

Find extension builders in Cornwall with MyBuilder

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

Step 2: Compare different extension builders in Cornwall

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

Step 3: Hire Cornwall extension builders with confidence

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

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

What to ask a Cornwall extension builder before hiring?

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

An extension builder in Cornwall 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 Cornwall 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 Cornwall?

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 Cornwall 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 Cornwall 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 Cornwall

Can an extension builder in Cornwall help with planning permission?

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

Many Cornwall 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 Cornwall help with materials and finishes?

Yes, most extension builders in Cornwall 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.