Extension builders in Treharris

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 5 (3 reviews)

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

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 Treharris

386 Results

Sort by:

LCMbrickwork
Rating: 5 out of 5
Extension Builder in Treharris
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.
Get in touch
Latest review:
Bricklaying- 2 Aug 2025
Lee was very friendly, helpful and professional. I would recommend him and his work.
Celtic Creations Construction Co
No reviews yet
Extension Builder in Treharris
Building South Wales with Expertise and Integrity (Est. 2023, with over 40 years of experience) Your Local Experts in: • Brickwork & Stonework Crafting beautiful, durable structures and walls that stand the test of time. • Patios & Driveways Transform your outdoor spaces with our expert design and installation services. Whether you’re looking for a sleek modern patio or a charming stone driveway, we’ve got you covered! • General Building & Maintenance From minor repairs to major renovations, trust our experienced team to maintain the quality and appearance of your home. Why Choose Celtic Creations Construction Co.? • Local & Trusted Serving South Wales, we are a local company with deep roots in the community. • 40+ Years of Experience Our team brings decades of experience in construction and maintenance to every project. • Friendly & Honest Service We take pride in offering clear communication, transparency, and integrity in all of our work. • Competitive Pricing Affordable solutions without compromising on quality. We’ll work with you to create beautiful results within your budget.
Get in touch
Signature carpentry limited
No reviews yet
Extension Builder in Treharris
With over 20 years in construction from commercial to residential experience We have a full team of qualified professionals tradesmen With a very high standard and professional attitude that we pride ourselves on Our main achievement is making the experience of your project as easy and stress free as possible and completed to a very high standard
Get in touch
MR Roofing & Construction
No reviews yet
Extension Builder in Treharris
Hi I’m mark I’ve been in the roofing trade for over 25 years flat and pitched roofing, we then went into building after it leading to this with 4 experienced workers no job is to small or to big, our knowledge in the roofing industry is one of the best we listen to what are customers want and suggest best options for them to give them the best solution for there project
Get in touch
RTW Builders Ltd
New on MyBuilder
Extension Builder in Treharris
Welcome to RTW Builders Ltd, your trusted partner for all your construction needs. We proudly serve South/Mid/West Wales areas and more with a wide range of expert services. RTW was created by a group of highly skilled tradesmen who between them have been working in the building industry for decades. We firmly believe that we provide traditional skills along with modern echo friendly methods and technology to provide an efficient service. Our wealth of experience allows us to offer skills gained over many years. The health and safety of our team, clients and public is of the highest priority. No matter what stage you are at in your project we can offer a complete service. We can deal with planning applications and in some cases planning refusals. Building control applications. Insurance claims, fire, flood and general damage. We have a dedicated team to carry out the ever more popular project of garage and loft conversions. If you need additional sitting room, office or separate living accommodation garage and loft conversions are an economic way of increasing a living space and often can be completed within permitted development which does not require a planning application. We are here to help.
Get in touch
LMG Home Improvements Ltd
Rating: 4.9 out of 5
Extension Builder in Treharris
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
Get in touch
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.
Rees Building Solutions
Rating: 4.6 out of 5
Extension Builder in Treharris
At Rees Building solutions we are a company with over 30 years experience and we cover all aspects of building work small or large from patios to extensions and new builds.
Get in touch
Latest review:
Conversions - General- 4 Jul 2019
All work carried out on schedule Always turned up when asked and said
Thomas westall contractor
No reviews yet
Extension Builder in Treharris
Hi there I’m a one/two man team who has 10 years experience in property maintenance and 5 years in commercial tiling/shop fitting/ bricklaying. Cscs reg. all aspect of building work undertaken with free quotes.
Get in touch
Gethin davies
Rating: 5 out of 5
Extension Builder in Treharris
All aspects of masonry ,over 20 years experience. New builds , renovations, extensions , retaining walls, foundations.
Get in touch
Latest review:
Stonemasonry- 29 Jul 2025
Gethin was great. Great communicator, good price, and Dundee took the job within a short space of time. I was very impressed, he did a great job of the wall. I have asked him to look at our garage to convert. Highly recommend 😊
Dmc Bespoke building.
Rating: 5 out of 5
Extension Builder in Treharris
Hi my name is Dominic. I have worked in the building trade for 30 years now, I started at the age of 12 working with my dad. I have done all wet trades. I specialize in brickwork and stonework to very high standards. I drive all my own plant to do my own groundwork and setting out. I have a lot of pride in my work. We are a family business friendly and polite. Thanks for taking the time to read our profile. Many thanks Dominic
Get in touch
Latest review:
Stonemasonry- 9 Aug 2026
Working with Dom and his team has been a great experience. His stonemasonry is first class as are his project management skills. He is meticulously tidy and expects this of others. Highly recommended.
R W Langford Builders Ltd
Rating: 4.7 out of 5
Extension Builder in Treharris
R W Langford Builders are a family run business that offer a friendly and reliable service and believe customer relations and satisfaction is a top priority. We can complete any building job from start to finish making it a stress free experience for our clients. All work is fully guaranteed and completed to the highest standard.
Get in touch
Latest review:
Extensions- 25 Jan 2025
Overall the job was fine. But noted a couple of issues after completion ,(and payment) but despite several notifications to the contractor, they never returned to correct the issues, and stopped responding. Very disappointed with their professionalism
Joe Ward electrical services
No reviews yet
Extension Builder in Treharris
I will cover all construction and electrical work and will be offering ev and pv installs by the end the year, I have a great team behind me and we will make sure all customers are happy with the work before leaving
Get in touch
TRH Homes LTD
Rating: 5 out of 5
Extension Builder in Treharris
Been a property developer for over 20 years. All building work undertaken, new build houses from the ground up, extensions, or house renovations.
Get in touch
Latest review:
Extensions- 23 Sep 2022
Russ did a brilliant job in my house , the extension was ready two weeks earlier than expected, good communication, always asking questions about how we would like to be ,what materials we would like to use , excellent people to work with!! Highly recommended
L.R.T Carpentry & building
Rating: 5 out of 5
Extension Builder in Treharris
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 .
Get in touch
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.
Eleusis Developments
Rating: 5 out of 5
Extension Builder in Treharris
We offer all aspects of building work from renovation to new builds and property repairs, completed to a very high standard by professional tradesmen. We take pride in our work and in customer satisfaction. We are also certified Velux installers and can provide you with roof light replacements, new installations, repairs and maintenance as well as sun tunnels.
Get in touch
Latest review:
Stonemasonry- 25 Sep 2026
Eleusis repaired the Bath Stone rendering at street door and replaced quarry tiles on the door threshold. They did a superb job very efficiently and were straightforward to employ, polite and helpful.
CJS construction & building ltd
Rating: 3.7 out of 5
Extension Builder in Treharris
All aspects of building works undertaken, rebuild walls, install patios, disability ramps, driveways etc. Big enough to deliver but small enough to care!
Get in touch
Latest review:
Electrical- 24 Dec 2021
Promised to look at job but decided hours before he was due that something had cropped up which meant he never turned up!

Top rated Extension Builders

Our Extension Builders in Treharris, are rated 5 out of 5 based on 3 reviews from customers like you.

Quality screening

Easily find verified local tradespeople. Just post your job to get quotes from tradespeople near you across the UK.

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

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

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

What are the hourly rates of extension builders in Treharris?

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

Find extension builders in Treharris with MyBuilder

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

Step 2: Compare different extension builders in Treharris

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

Step 3: Hire Treharris extension builders with confidence

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

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

What to ask a Treharris extension builder before hiring?

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

An extension builder in Treharris 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 Treharris 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 Treharris?

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 Treharris 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 Treharris 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 Treharris

Can an extension builder in Treharris help with planning permission?

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

Many Treharris 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 Treharris help with materials and finishes?

Yes, most extension builders in Treharris 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.