Extension Builders in St Austell

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

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 St Austell

250 Results

Sort by:

Tindale Building Services
No reviews yet
Extension Builder in St Austell
We are domestic extension specialists with over 40 years trading experience. A family run business with a different approach to building. All quotations and advice is free. Some of our most recent work is available to view on Facebook.
Get in touch
Prennek Construction
No reviews yet
Extension Builder in St Austell
With over 15 years of construction experience. Along with a level 3 City and Guild apprenticeship in Site Carpentry and Bench Joinery. We love to use our skills and test our abilities in creating high quality work and customer satisfaction. We are just as happy erecting a timber frame extension as building small bespoke storage solutions.
Get in touch
B. E. L. S. Builders
No reviews yet
Extension Builder in St Austell
BELS Building & Landscaping is a family-run business catering for all building and landscaping requirements in Cornwall and West Devon. With over three decades of experience, we offer a range of services including but not limited to: • All aspects of bricklaying (Brick, Block, Stonework) • Extensions, renovations, and new builds • Landscaping and fencing • Paving, patios and driveways • Groundworks and drainage
Get in touch
K J Construction
No reviews yet
Extension Builder in St Austell
K J Construction Is an established building company which exceeds to offer assistance in all aspects of the building trade and construction industry - we are highly motivated to Collaborate with customers in order to ensure all there requirements are met. It is our mission to provide a Streamline customer service and make sure your needs are met at the highest possible standard. K J Construction is fully qualified, Facilitated, Meticulous and Efficient in all respects from start to Finish, inside and out.
Get in touch
BLR Design & Build
No reviews yet
Extension Builder in St Austell
I am a sole trader who has been self employed for the last 3 years, and have a total of 7 years of general building experience. I am also a qualified part 1 architectural designer, after graduating from university in 2022. I have worked on many different projects, big and small, from complete garden renovations, to whole house renovations, dormer/loft renovations, full house re-plaster projects, block work on new builds, re-roofs, etc. I am a very enthusiastic and motivated worker, with an eye for perfection. I make sure every job is finished to my upmost level of satisfaction, as well as the customers. I’m a very polite and professional character, which great communication and time keeping skills.
Get in touch
Grain Carpentry
Rating: 5 out of 5
Extension Builder in St Austell
Hi there! I'm Matt, a bespoke fencer and carpenter based in Truro. I take pride in delivering top-quality craftsmanship and attention to detail in every project. My focus is on providing professional, polite, and friendly service, ensuring a smooth experience from start to finish. Whether it’s enhancing privacy, security, or curb appeal, I treat every fence installation as if it were for my own home, always aiming for both functionality and aesthetic appeal. I specialise in custom solutions tailored to your specific needs, whether that’s a classic wooden design, something modern, or something uniquely your own. My reputation is built on reliability, skill, and a commitment to exceeding client expectations. Each project is handled with the utmost care, and I pride myself on offering exceptional customer service. If you’re looking for a trusted, experienced fencing professional, I’d be honoured to help you bring your vision to life.
Get in touch
Latest review:
Exceptional service and kind attitude we’ve use many trades over the years but Matt stands out by a mile! We would have him back soon it’s hard to find trusted trades you can rely on!
KERNOW ELECTRICS & SOLAR LIMITED
No reviews yet
Extension Builder in St Austell
Kernow Electrics & Solar Limited are a Solar installation company with qualified roofers in our employment allowing us to us to be able to do electrical work and roofing work. We do all building work from repairs to extensions. We don't mess people about we price the jobs correctly and are fully qualified to do them, we are fully insured and members of napit
Get in touch
APS Construction Services Ltd
No reviews yet
Extension Builder in St Austell
Carrick Construction is a leading construction firm and principle contractors offering a complete construction delivery service, from feasibility and planning to all building requirements and continuous project management. We have over 25 years experience in delivering extensions, new builds, multi-unit sites for developers, conversions and refurbishments, civil engineering, utilities/services connections and all groundworks.
Get in touch
Jr Huston
Rating: 5 out of 5
Extension Builder in St Austell
Builder who loves their work and main goal is making customers happy, enjoy challenging jobs where I can really excel at
Get in touch
Latest review:
JR and his team painted my house, installed a new external door, carried out rendering and plastering work, laid an extensive new patio, repaired a problematic flat roof, and erected a new balcony balustrade. They take pride in their work, insisted on doing a thorough job, and were unusually determined to resolve issues properly as they arose. They provided excellent value for money and were polite and hardworking throughout. I highly recommend them.
Temple Tradesmen
Rating: 5 out of 5
Extension Builder in St Austell
Welcome ! I'm Ryan Marlow, and I'm thrilled to introduce you to my company. With over a decade of experience in the southwest, I take immense pride in being a general builder and property developer. Since leaving school, I've built housing estates in and around Birmingham as a bricklayer. However, my move to Cornwall led me to diversify my skills in stone work, plastering, carpentry, patios, lime work, rendering, Extensions ,patios ,garden walls ,new builds, renovations and more. I work alongside a reliable and skilled team to ensure top-notch quality and timely project completion. Let's bring your vision to life! 💪 #GeneralBuilder #PropertyDeveloper #SkilledTeam foundations. Thank you for your time
Get in touch
Latest review:
Bricklaying- 24 Apr 2026
Ryan came and repaired the damaged wall of the garage, and completed in good time. Left the site all clear, so very pleased
Sw construction
No reviews yet
Extension Builder in St Austell
Sw construction undetake all aspects of construction from a new bathroom to a new build property
Get in touch
board it and skim it
Rating: 4.9 out of 5
Extension Builder in St Austell
Hi I'm dave from Board it and Skim it I have 25 years experience in the building trade, from plastering work to extensions new builds and renovations, we have spent last two years renovating grade 2 listed house with extension and a modern gym sauna extension in rock, attention to detail on all aspects. We have a nice client portfolio in Cornwall with plenty of happy customers, feel free to contact and we can suit your requirements
Get in touch
Latest review:
Handyman- 14 Jun 2024
Excellent - would recommend
Ley Construction South West Ltd
Rating: 5 out of 5
Extension Builder in St Austell
Ley Construction and joinery is a company providing quality construction projects from new builds and Groundworks to extensions and custom kitchens .Covering the whole of the south west at very competitive prices .No job too big or too small.we can help.
Get in touch
Latest review:
Extensions- 2 Nov 2017
Mark and the boys have been fantastic. From the professional and comprehensive quote that was provided, we were able to see exactly where the budget was being spent with a payment plan included. Nothing was to much for the team and Mark was always on site to liaise with structural engineers etc to offer his professional opinion and answer any queries. Would highly recommend for any building/carpentry needs.
J.A.B Landscape Construction
Rating: 4.9 out of 5
Extension Builder in St Austell
My name is Ben Rickard I am a landscaper/mason who has been in the general building trade for 10+ years, working on all types of projects mason and carpentry. I work with another Landscaper/mason (Joe Sands) who has had 6+ years experience in the industry, we both offer a wide range of services, anything not listed can be discussed just ask us, we specialise in block/brick/stonework/plastering/slabbing/fencing/decking and all other landscaping aspects.
Get in touch
Latest review:
Bricklaying- 27 Apr 2026
Simply amazing. Reliable, and excellent attention to detail. Very tidy brickwork, it's just a shame I didn't find them sooner. I'll definitely be saving their number and going direct from now on.
Jackson Developments
Rating: 5 out of 5
Extension Builder in St Austell
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.
Swift Solutions
Rating: 4.8 out of 5
Extension Builder in St Austell
I have 20 years experience as an electrician and am part of a competent persons scheme meaning that I can self certify my own work. I specialize in all areas of domestic electrical work. I also have over 20 years of building and maintenance experience, which means I can undertake and oversee small building works such as extensions, bathrooms and kitchens from start to finish. I use bonafide sub contractors for all areas of the job to complete projects to a high standard.
Get in touch
Latest review:
Bathroom Fitting- 21 Apr 2025
Initially we were in touch with Dan about the installation of an extractor fan, but on his visit to the property it was clear that he'd be the right person to do much more. Essentially, he re-furbished the whole property, with a new kitchen, re-designed main bedroom, new front and back doors, a new flat roof over the bathroom, new shelving in the front room, painting throughout and clearing a derelict gazebo in the back garden. We were very happy with the advice and work that we received from Dan, including the way he brought in a couple of sub-contractors such as for carpentary and roofing.

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

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 St Austell 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 St Austell who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in St Austell?

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

Find extension builders in St Austell with MyBuilder

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

Step 2: Compare different extension builders in St Austell

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

Step 3: Hire St Austell extension builders with confidence

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

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

What to ask a St Austell extension builder before hiring?

Before hiring an extension builder in St Austell or extension building company in St Austell, 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 St Austell?

An extension builder in St Austell 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 St Austell 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 St Austell?

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 St Austell 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 St Austell 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 St Austell

Can an extension builder in St Austell help with planning permission?

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

Many St Austell 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 St Austell help with materials and finishes?

Yes, most extension builders in St Austell 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.