Extension Builders in Penzance

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Some of our top rated extension builders in Penzance

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AP carpentry & Construction
Rating: 5 out of 5
Extension Builder in Penzance
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.
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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.
Wynne Construction
No reviews yet
Extension Builder in Penzance
We are a family run business, with over 20 years experience in the building industry and have a large portfolio of jobs West Cornwall.
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GTB Builders
Rating: 5 out of 5
Extension Builder in Penzance
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.
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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.
Scott Laity Carpentry
Rating: 5 out of 5
Extension Builder in Penzance
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.
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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
Scott Taylor
Rating: 5 out of 5
Extension Builder in Penzance
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.
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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.
DcB Carpentry
Rating: 5 out of 5
Extension Builder in Penzance
Local self employed carpenter. I am a small independent business, I hold high standards and pay great attention to detail. I specialise in: -new builds, extensions, renovations, roofing, kitchens, wardrobes and all first & second fix tasks. I've been spending 6 years learning my craft and gaining experience. Now starting to reach out into the local community and helping in anyway I can.
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Latest review:
Carpentry- 13 Dec 2024
3 internal doors & locks installed. Date was arranged and finished. Overall, "a proper job" completed by a local tradesmen and the price was really good. Apart from external & internal cameras this option will add another level of protection to stop or hinder any intruder.
Alpine Construction
Rating: 5 out of 5
Extension Builder in Penzance
I'm a self employed builder with over 20 years experience in the construction industry. I have taken many building projects on in my career ranging from building garden walls to completely building and managing extensions and major renovations. my skills include - Block laying, rendering, groundworks, landscaping, project managing and problem solving. I have a strong knowledge of general building within the county of Cornwall.
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Latest review:
Fencing- 29 Sep 2025
A very personable polite man came and quoted for the job, gave me a price and a time scale. I was happy to move forward and he slipped the job in the same week between jobs. He was on time, tidy, polite cleared up after himself and best of all made the perfect fence just as we'd discussed at a cost I could manage. 10/10... so much so he's quoting for another job for me. I honestly couldn't be happier and would definitely recommend to friends & family without hesitation. Thank you Alpine.
Bp construction
Rating: 5 out of 5
Extension Builder in Penzance
I am a local general builder and groundworker. I undertake all aspects of building and construction work from new builds,extensions,renovations no job is to big or no job is to small ......and my work is to a very very high standard with a friendly attatude and I duty of care for our customer.
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Latest review:
Groundwork & Foundations- 7 Mar 2024
From my first point of contact with Ben through to completion he provided a very professional service and delivered on time as promised, I would highly recommend Ben to anyone considering any domestic project, its not easy to find reliable people these days. I would definitely use the company again. Thank you BP Construction.
K.Jose & T.Rice
No reviews yet
Extension Builder in Penzance
Tim Rice and Kevin Jose. Carpentry and building. Free quotations/advice. 60 years experience between us, many happy customers. References available, previous projects can be visited. We have a full team of qualified tradesmen at our disposal to ensure all aspects of your project can be completed to the highest standard.
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Wynne Construction
No reviews yet
Extension Builder in Penzance
Wynne construction covers all aspects of building work, we offer a complete service from start to finish. With every job we undertake, we aim for the best possible finish and result to satisfy our customers wants and needs.
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Williams carpentry & timber frame
Rating: 5 out of 5
Extension Builder in Penzance
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.
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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
L&B Roofing Services
Rating: 5 out of 5
Extension Builder in Penzance
We are a family run business based in helston, We cover .chimney re-builds .Re roofs .Repairs . Facias sofits an guttering . Round roofs/ turrets Fully qualified level 2 nvq and dimploma. All our work is undertaken to the highest quality. Insuring a happy client through out.
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Latest review:
Excellent job. Would use again.
Stevie carpentry
Rating: 5 out of 5
Extension Builder in Penzance
Carpenter/joiner/timber frame erector
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Latest review:
We required a new roof to our shed , Stevie McCleary provided both excellent advice, on the materials that should be used and the way he was going to proceed with the job. He kept me informed at every stage. He was polite , reliable, respectful and extremely professional at every stage of the job, which was completed in the timeline mentioned at the beginning of the job. I would not hesitate in using his services again in the future.
Crofty Construction Ltd
No reviews yet
Extension Builder in Penzance
At Crofty Construction, we bring hands-on expertise, local knowledge, and a commitment to quality to every project we take on. Based in Cornwall, we specialise in residential building work — from extensions and renovations to structural repairs and bespoke finishes. With over 20 years of experience, our team combines practical know-how with a friendly, professional approach. We’re proud to offer clear communication, reliable timelines, and a clean, respectful worksite. Whether you’re planning a small upgrade or a major transformation, we’ll guide you through the process with transparency and care. We hold full SMAS Worksafe accreditation, are Gold members of Constructionline, and our team is SMSTS, CPCS, and CSCS qualified — ensuring your project is delivered safely, professionally, and to the highest standards. We’re fully insured, compliant with all building regulations, and happy to provide references from previous clients. If you’re looking for a builder who values craftsmanship and community, Crofty Construction is here to help.
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B H Builders
Rating: 5 out of 5
Extension Builder in Penzance
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.
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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.
ANNED DEVELOPMENTS LTD
No reviews yet
Extension Builder in Penzance
Anned Developments is a multi-disciplinary construction company delivering high-quality renovations, extensions, and new builds. With all trades working directly for us, we provide a complete service covering project management, engineering, and every phase of construction. We support both private clients and public-sector organisations, delivering reliable, fully managed building solutions.
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What types of services are offered by local extension builders in Penzance?

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

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

What are the hourly rates of extension builders in Penzance?

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

Find extension builders in Penzance with MyBuilder

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

Step 2: Compare different extension builders in Penzance

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

Step 3: Hire Penzance extension builders with confidence

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

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

What to ask a Penzance extension builder before hiring?

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

An extension builder in Penzance 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 Penzance 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 Penzance?

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 Penzance 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 Penzance 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 Penzance

Can an extension builder in Penzance help with planning permission?

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

Many Penzance 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 Penzance help with materials and finishes?

Yes, most extension builders in Penzance 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.