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

251 Results

Sort by:

Scott Laity Carpentry
Rating: 5 out of 5
Extension Builder in St Austell
We are now trading as S & T Carpentry Ltd offering Carpentry services across West and Mid-Cornwall. We take on anything from kitchen refurbishment to project managing large extensions. We enjoy great working relationships with our customers, suppliers and sub contractors.
Get in touch
Latest review:
Carpentry- 21 Jan 2025
Scott and Tristan were an absolute pleasure to work with…. Their work was nothing short of perfection… they kept me informed on a daily basis and did the most fantastic job… I’m hoping they will come back and do more… I have highly recommended them to my friends and would highly recommend them to anyone… thankyou both for your amazing work
Overland Construction (SW) Limited
No reviews yet
Extension Builder in St Austell
We are building contractor who will undertake new builds, extensions and loft conversions. All aspects of construction are considered with free advice and quotations. Fully insured and testimonials are available upon request.
Get in touch
Mehrivan Lagos Group
No reviews yet
Extension Builder in St Austell
We are a team of civil engineers with strong international experience in construction, refurbishment, and architectural finishes. With over 18 months of hands-on work in the UK, we have contributed to one of the country’s largest precast architectural fabrication operations. Before that, we successfully delivered more than 42 projects across Iran and Nigeria, ranging from residential renovations to large-scale commercial developments. Our background in engineering ensures that every project is completed with precision, structural understanding, and high-quality workmanship. We bring a global perspective, strong technical skills, and a commitment to delivering reliable, professional refurbishment and decoration services for every client.
Get in touch
Scott Taylor
Rating: 5 out of 5
Extension Builder in St Austell
We are a general building company and have nearly thirty years experience specialising in building and roofing work. We are fully insured and experienced in new builds, extensions, renovations, barn conversions etc and will also take on any maintenance jobs. It is of upmost importance to keep our customers happy and we will go above and beyond to do this.
Get in touch
Latest review:
Extensions- 12 Nov 2017
Scott was professional, always ready to give advice, thorough and timely, keeping us up to date with the progress. The job was done quicker than expected and the price was adjusted accordingly. I definitely would recommend him and look forward to working with him in the future.
GTB Builders
Rating: 5 out of 5
Extension Builder in St Austell
I’m Gary, I’ve been in the trades for over 40 years covering various projects ranging from small repair work to building multi million pound houses. Im fully covered and insured and provide a reassuring process throughout the project. Using this app to fill space in the diary due to other customers having some delays. I cover all aspects construction. Some of services I provide are : New builds, Loft conversions, Extensions, Groundwork’s, Roofing, Summer house/sheds, 1st/2nd fixCarpentry, Kitchen/bathroom fitting, Internal/external doors and windows, Driveways, Full refurbishments and renovations, Masonry, Rendering/Plastering, Landscaping And more! Feel free to get in touch.. there are no jobs to big or small. Thanks, Gary.
Get in touch
Latest review:
Roofing (Pitched)- 24 Feb 2026
I was very grateful to Gary and his team for getting me out of a hole when my 80 year old outbuilding roof was blown off by the January storm. From first to last he acted in a very professional manner by clearly outlining the issues that needed to be addressed and the way he would resolve the problem. I have nothing but praise for the whole experience and should misfortune ever come my way again I would, without hesitation, reach for the phone and ring him. When you find someone you can trust you invariably keep their phone number.
AP carpentry & Construction
Rating: 5 out of 5
Extension Builder in St Austell
Established in 2006 with buiding and construction background.Fully qualified & insured. City & Guilds carpentry & joinery covering all aspects. With extensive experience. From joinery to timber frame and cut roofing .Plyed with a broad and time served building knowledge & skills .from ground works, form work, to block work ,plastering and rendering, cladding. from new builds built to latest specification to alterations ,conversions & renovations. A good long established network of trades.
Get in touch
Latest review:
Extensions- 11 Oct 2024
Adam was very helpful and accommodation from start to finish. He completed our extension for us, adding drainage, a new warm roof, insulating and cladding the outside of the existing property and new extension, fitting doors and windows, adding stud walls, finishing the internals to plaster and fitting internal doors and skirting. He spoke to building control and worked with them to ensure the work was fully compliant with building regulations. He's was very accommodating with payments, which were completed in stages and we had a lot of trust in him because of this. He was flexible in terms of when he completed the work for us as well, which really helped. If we had any slight changes we wanted to make or we noticed any issues he was very fast to fix these and he ensured all of his work was carried out to a high quality. He is aways very friendly and positive and I would highly recommend him to anyone thinking of doing something similar.
Lee Newton General Builder
No reviews yet
Extension Builder in St Austell
My business is well established and been running for 10 years . I’m a general builder and undertake most aspects of building from block work , Plastering , roofing and extensions.
Get in touch
Cornwall Home Renovations Ltd
No reviews yet
Extension Builder in St Austell
We are a Cornwall based general building company specialising in bathroom and kitchen fitting, as well as extensions and renovation work across the local area. We cover all aspects of general building in-house, including plumbing, plastering, tiling, flooring, carpentry, roofing, and conversions such as garage conversions. This allows us to manage projects properly from start to finish, with one reliable team throughout. We’re proud to work with local homeowners, offering honest advice, good communication, and high quality workmanship. Whether it’s a new bathroom, kitchen upgrade, extension, or full refurb, we focus on doing the job right and leaving a clean, tidy finish.
Get in touch
Williams carpentry & timber frame
Rating: 5 out of 5
Extension Builder in St Austell
WCTF carpentry and joinery company situated in Cornwall covering all aspects of carpentry, joinery and building. 1st & 2nd fix, renovations, new builds, custom cabinetry and wardrobes, kitchens, traditional cut and truss roofs. 15 years experience in the trade. All tools and required insurances for all aspects of the trade.
Get in touch
Latest review:
Kitchen Fitting- 24 Oct 2023
Ash and Tom fitted our IKEA kitchen in our renovation project. They were absolutely fantastic. They problem solved various issues that arose with the kitchen, they have clearly huge amounts of experience with fitting kitchens and their carpentry background meant that the final product was brilliant. They worked quickly and effectively and got the job done in the time they said they would. They were kind and conscientious throughout. Would 100% recommend
B H Builders
Rating: 5 out of 5
Extension Builder in St Austell
B H Builders & property maintenance is a small building company in the heart of Cornwall, with over 20 years experience in all aspects of masonry and general building work from drainage right through to roofing. specialising in block/brickwork, plastering and rendering.
Get in touch
Latest review:
Plastering- 23 Aug 2020
Ben was very professional and plastered my wall to a high standard. Very polite and tidy. Would definitely recommend and hire again.
j.hartnell construction limited
No reviews yet
Extension Builder in St Austell
we are a construction company /masonry contractor with a team of blokes covering in devon and cornwall. we cover all masonry works substructure and superstructure. from block/stonework/brick/ patios/ extensions/ new builds/ site work. with over 20 years experience in the construction we cover most needs.
Get in touch
Platinum Renovations
New on MyBuilder
Extension Builder in St Austell
Renovation company taking on plastering work. Kitchen and bathroom re fits. Remodelling of your house.
Get in touch
AGB Carpentry
Rating: 1 out of 5
Extension Builder in St Austell
Hello my name is Alex. Carpenter by trade although have experience in most trades as I’ve been in the trades for about 11 years. I was employed for a few years and have recently decided to work for myself. I absolutely pride myself on finishing to the highest standards and am always looking for ways to increase both skills and knowledge. Below are jobs I cover: Extensions Renovations New builds 1st/2nd fix Carpentry Kitchen fitting Fencing Brick/block build Groundwork’s Soffit/Fascia/Guttering Loft conversion etc. I look forward to hearing from you. Please feel free to ask me anything! Thank you
Get in touch
NGL Construction
Rating: 3 out of 5
Extension Builder in St Austell
With over 17 years experience in the construction industry NGL Construction is able to offer you wide range of trades. From new builds to renovations, plastering to bathroom fitting every job we do is done to the highest of standards with 100% commitment. We have built our reputation on quality work, competitive pricing and a friendly service.
Get in touch
Latest review:
Bricklaying- 30 Jan 2018
never came, phoned text last minute, he found better paid jobs due to gales that passed through at that point in time.
DT CARPENTRY AND CONSTRUCTION LTD
Rating: 5 out of 5
Extension Builder in St Austell
Hi. My name is Dean and I am the director of a local carpentry and construction business that covers all aspects of construction. I have been in the trade for over twenty years now and I have built a great team of tradesman to cater for all of your development and construction needs from kitchen and bathrooms to full builds and extensions/ loft conversions.
Get in touch
Latest review:
Extensions- 29 Jun 2025
Sun, 29 Jun at 20:50 Dean and his team were a pleasure to work with and he was excellent at communicating. Also great at finding solutions for various challenges that developed as the project unfolded. Trustworthy and fair- would certainly recommend.
H2O plumbing and Heating
No reviews yet
Extension Builder in St Austell
I have been in the construction industry for the last 20 years covering all aspects of building work. loft conversions, extensions, kitchen and bathroom installation and renovation. I am also a qualified plumber and install all type of central heating/underfloor heating and unvented cylinder.
Get in touch

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.