Extension Builders in Carmarthen

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4 (2 reviews)

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Some of our top rated extension builders in Carmarthen

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RJD Home Improvements
Rating: 4.9 out of 5
Extension Builder in Carmarthen
General building, roofing, landscaping, extensions, internal and external plastering including EWI system, PVC windows doors facia boards, guttering. CERTASS registered installer Membership number 24-1369
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Latest review:
Extensions- 29 Sep 2025
Our job started out as a small kitchen extension and shower/utility room but grew to also include fitting of a new kitchen, new kitchen ceiling, new double glazed windows to back of house, new garden wall approximately 50ft long and 5ft high and insulation to two internal bedroom walls. Rob and his team are extremely versatile and very approachable. I would certainly recommend them and we are hoping to have some more double glazing work done in the near future.
Pristine Contractors
New on MyBuilder
Extension Builder in Carmarthen
Pristine Contractors Ltd are a trusted renovation and building company specialising in high-quality home improvements across Swansea and South Wales. From extensions and garage conversions to full home renovations and interior transformations, we manage projects from start to finish, working with reliable, experienced trades to deliver a professional finish with minimal stress for our customers. We pride ourselves on quality workmanship, clear communication, reliability and keeping every project clean and well managed.
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LCMbrickwork
Rating: 5 out of 5
Extension Builder in Carmarthen
We at lcmbrickwork have over 15 years of experience in all aspect of brick,block and stonework. No job to big or small!we cover all over south wales.
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Latest review:
Bricklaying- 2 Aug 2025
Lee was very friendly, helpful and professional. I would recommend him and his work.
Emyr Davies A'i Fab Cyf
No reviews yet
Extension Builder in Carmarthen
The main activities of the company include the renovation/refurbishment works to existing buildings; also the construction of new buildings. We employ a full range of trades which means that we seldom need to sub-contract works packages to others We specialise in bespoke joinery, and have a civil engineering arm who cover all aspects of external works.
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LMG Home Improvements Ltd
Rating: 4.9 out of 5
Extension Builder in Carmarthen
LMG Home Improvements is a leading contractor in home renovation projects across the Wales and South West region. With a reputation for delivering excellence in customer service and strong partnership culture, we provide a range of home improvements to meet our clients needs. We offer a complete package for a home transformation for small or large refurbishments. We specialise in dealing with failed cavity wall insulation and retrospective remedial measures in silicone enhanced rendering and External Wall Insulation to leave a warm and dry, long lasting solution. We also offer roofing services and are committed to superior quality and results in slate and tiled roofing, EPDM Rubber roofing, GRP Fibreglass roofing and also funding towards insulating your flat roof. Our Building Services team is a one stop shop for all general building including extensions, loft conversions, property refurbishments and replacement windows & doors. Our team of experts are able to provide advice for your home renovation to ensure your dream makeover becomes a reality. We believe in the philosophy that our customers journey is just as important as the finished result. This is what we think makes us different. 15 years experience
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Latest review:
Plastering- 4 Nov 2024
LMG have just completed a full silicone render of the back of our house, over 3 floors. Really pleased with the work, and the general standard of updates and quality throughout. To find a company so reliable, with such great work is really hard, and wouldn’t hesitate to use them again. Chose SeaMist colour for the Johnson’s render, and it looks amazing. Also very pleased at the scaffolding provided, and then very swiftly removed.
DJ carpentry and construction
Rating: 5 out of 5
Extension Builder in Carmarthen
Builder and carpenter
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Latest review:
Conversions - General- 8 Sep 2022
Job completed on time and to a good standard
RV Roofing & Construction
Rating: 4.9 out of 5
Extension Builder in Carmarthen
I have 20+ years experience im a qualified roofer by trade All aspects of roofing & construction undertaken new builds strip and reslate old properties lead work.general. fibreglass flat roofs Building work all my work is done to a high standard work can be guaranteed no job to big or small free quotes
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Latest review:
Bricklaying- 6 Dec 2024
An excellent job even the weather was bad. would recommend them. Very satisfied with the work.
T.J. Williams Carpentry, Renovation & Roofing
Rating: 5 out of 5
Extension Builder in Carmarthen
I am time served carpenter and joiner and been self employed for the past eight years, and worked the remaing three years working for a building contractor. My qualifications are NVQ level 3 in Carpentry & joinery, I have worked on large sites to small domestic jobs offering all ranges of Carpentry.
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Latest review:
Fascias & Soffits- 20 Jan 2021
Great job done tidy lads .
Gower Home Improvements
No reviews yet
Extension Builder in Carmarthen
We are a construction company covering all aspects of building and maintenance, from extensions to loft conversions. Having trained as a carpenter and joiner with over 10 years experience, there's nothing we cannot do! Our services include: loft conversions, extensions, bathrooms, kitchens, tiling, fitted wardrobes etc.
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Cromwell construct
Rating: 4.5 out of 5
Extension Builder in Carmarthen

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Latest review:
Garden Maintenance- 25 Mar 2025
They are doing excellent work, and very friendly. Only a few hiccups setting up the agreement as to what is required
Phoenix construction and maintenance wales
No reviews yet
Extension Builder in Carmarthen
Small family business with over 20 years experience on all aspects of domestic building. We undertake any job from small patch work to complete renovations, extensions or new builds.
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L.R.T Carpentry & building
Rating: 5 out of 5
Extension Builder in Carmarthen
All aspects of Carpentry and building work covered and undertaken by Highley qualified tradesmen . We take on all work from site work, self builds a door to extentions .no job to big or small .
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Latest review:
Hard Flooring- 16 Apr 2017
Luca is a very pleasant and agreeable person who works hard and demonstrates a willingness to work with the client. Hardworking, thorough and reasonably priced. Highly recommended. ...Luca laid new wood floors in two rooms which involved lifting existing parquet and carpets, work was of a high standard.
D Williams General Builder
No reviews yet
Extension Builder in Carmarthen
I have been in the building industry for over 30 years. I can price and carry out projects including materials or without - which ever you prefer. I am very competitive with my prices and will endeavour to match any other quotations. I take great pride in my work and hold myself to an excellent standard. I always aim to deliver on time and to budget, whilst being flexible to adapt should the scope of the job change, as my priority is always customer satisfaction.
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Fisher & Family
No reviews yet
Extension Builder in Carmarthen
We are a family run business,I have been trading for 15 years with the highest qualifications we offer a fast friendly reliable service,full portfolio available
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DMS BUILDERS AND ARCHITECTURAL DESIGNS
No reviews yet
Extension Builder in Carmarthen
With more than 36 years of experience in the industry, our team at DMS Builders & Architectural Designs prides itself on delivering top-notch building services. We're not just builders; we're creators, offering comprehensive architectural design solutions using AutoCAD. From the initial design phase through to planning and the creation of full construction drawings, we're committed to bringing your vision to life with precision and excellence.
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Hudsonbuilders
No reviews yet
Extension Builder in Carmarthen
Based in Carmarthenshire 3 generations in the trade Level 3 qualified carpenter All types of building work undertaken Complete house reroofs Flat roofs All carpentry work 1st and 2nd fix Patios Renovations New builds Extensions Photos of our previous projects available
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Top rated Extension Builders

Our Extension Builders in Carmarthen, are rated 4 out of 5 based on 2 reviews from customers like you.

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

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

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

What are the hourly rates of extension builders in Carmarthen?

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

Find extension builders in Carmarthen with MyBuilder

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

Step 2: Compare different extension builders in Carmarthen

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

Step 3: Hire Carmarthen extension builders with confidence

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

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

What to ask a Carmarthen extension builder before hiring?

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

An extension builder in Carmarthen 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 Carmarthen 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 Carmarthen?

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 Carmarthen 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 Carmarthen 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 Carmarthen

Can an extension builder in Carmarthen help with planning permission?

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

Many Carmarthen 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 Carmarthen help with materials and finishes?

Yes, most extension builders in Carmarthen 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.