Extension Builders in Cardiff | MyBuilder

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Some of our top rated extension builders in Cardiff

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Rhys Harris Carpentry and Construction
Rating: 5 out of 5
Extension Builder in Cardiff
With 20+ years of experience as a skilled carpenter and builder in Cardiff, NVQ Level 3 in Advanced Carpentry & Joinery, I'm dedicated to top-tier craftsmanship. From intricate carpentry to extensive projects like extensions, attic conversions, renovations, and crafting kitchens and bathrooms, I bring precision and passion to every task. Your project is my canvas for creating appealing spaces that showcase my dedication to the trade.
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Latest review:
Hard Flooring- 9 Jan 2019
Friendly, professional, have used Rhys since and wouldnt hesitate to use again. Very reasonable rates and cleaned up after!
J D Renovations and Building Services
Rating: 5 out of 5
Extension Builder in Cardiff
I undertake and type of construction work from new builds, extension, loft and garage conversions through to complete renovations of commercial or domestic property.
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Latest review:
Extensions- 17 Jul 2026
We are really pleased with the first floor extension. All trades were excellent at what they did as well as being friendly polite and respectful. The communication before and right through the works could not have been better from James. We agreed and stuck to a staged payment plan. We had no problems at all and any queries were dealt with promptly and professionally. We have already recommended to friends and do the same to anyone considering this firm
ALEXANDER DESIGN BUILD LTD
Rating: 4.8 out of 5
Extension Builder in Cardiff
We offer a wide range of services, no job is too small. Mainly offer Design/Build service but will also consider maintenance work and smaller projects
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Latest review:
Restoration & Refurbishment- 22 May 2026
Job went well, Alex was excellent in keeping me informed on progress each day as I wasn’t able to come to the job often. Quality of work completed was excellent, finished to great standard. Left the completed job in a very clean state with no cleaning up needed by myself. Would definitely recommend and will be using Alex again for future projects.
Priority Carpentry and Building
Rating: 5 out of 5
Extension Builder in Cardiff
An established business offering all aspects of carpentry & general maintenance in the Cardiff and South Wales area we are a professional,reliable and friendly service. All of our work is carried out to the highest standard by fully qualified carpenters and builders and all work is fully guaranteed.
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Latest review:
Carpentry- 25 Mar 2018
Job was to replace bowing joists and level ceiling, responded very quick and would defiantly hire again
S.m. Property services
Rating: 5 out of 5
Extension Builder in Cardiff
After working for 23 years in the construction trade working for big companies I have now set up on my own, I have a lot of experience and feel I’m very competitively priced . I have worked on residential and business properties aswell as local authority work . Being new to my build I’m keen to build up my online clients and positive feedback. Please get in touch for a no obligation quote .
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Latest review:
Conversions - General- 7 Feb 2025
Stephen and his Team were utterly professional, their work was faultless and we couldn't be happy with the job. We had a wall removed in the kitchen which needed a support putting in, and a wall removed in the bathroom and a doorway sealed up. Right from my initial contact with Stephen we got got a good feeling, his quote was the most competitive but we had already decided to go with Stephen anyway as his experience, expertise and integrity were obvious as talked us through the job and what would be required. Their work was fast and to a great standard. We were very impressed with how clean Stephen and his Team managed to keep the house throughout all the work (especially as we have black mortar in the walls), they cleaned up throughly every evening and it made life so much easier on us.
Britton Construction
Rating: 4.9 out of 5
Extension Builder in Cardiff
Based in Cardiff, Britton Construction is a privately owned business founded on the principle of employing the very best team of professionals in the industry in order to deliver the highest standard of high spec renovations and new build projects. We have worked in the construction industry for over 22 years covering South Wales & Bristol. You will find our small team of qualified tradesmen to be prompt, reliable and professional in everything we do, be it fitting a new driveway, converting a garage into usable space, building new properties, house extensions, garden walls, patios, fencing, pergolas and much more.
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Latest review:
Extensions- 26 Jul 2025
We had an entry room built. Overall communication was good. Small few things we mentioned, Toby made sure to amend to our liking. Toby even agreed to undertake a few extra works.
CDH Contractors Ltd
Rating: 5 out of 5
Extension Builder in Cardiff
We are a family run business with over 40 years experience in the construction industry.
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Latest review:
CDH Contractors have been amazing throughout our home renovation. They transformed our kitchen beautifully, giving it a fresh new look that we absolutely love. They also made a huge difference in our garden with their landscaping work, creating a space that feels inviting and well designed. The highlight has to be the garden room they built for us — it’s become our peace haven, and we now spend most weekends relaxing there. Their craftsmanship, attention to detail, and professionalism truly stand out. I would highly recommend CDH Contractors to anyone looking for high-quality work. We’ll definitely continue using them as we complete the rest of the renovations in our home.
Orange stone construction
Rating: 5 out of 5
Extension Builder in Cardiff
Orange Stone Construction Ltd is known in the local area for providing a wide range of expert house extension and new build solutions. We will use top-quality materials and equipment to assist us on every project, ensuring we deliver only the best possible results for our clients. Regardless of your project size, you can always rely on our team to get the job done! We strive to complete each job efficiently and offer assistance whenever you need it.
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Latest review:
Conversions - General- 23 Jun 2025
James and his guys were very good. Started when they said and done a really good done in the timescales estimated. Would recommend to anyone 👍
blakeon living spaces ltd
Rating: 5 out of 5
Extension Builder in Cardiff
we are based in South Wales we specialise in renovation works experts in loft conversions and we also have a landscaping team
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Latest review:
Loft Conversion- 11 Jun 2026
We recently completed a loft conversion with Dean and his team at Blakeon, and I couldn't be happier with the result. The workmanship has been excellent throughout, and the new loft space has completely transformed the house while feeling fully integrated with the rest of the property. What really stood out was the communication, reliability and flexibility. As the project progressed, I refined several design decisions before they were finalised, and Dean was always patient, accommodating and willing to discuss options. The project included a number of additional complexities, all of which were handled professionally and pragmatically. I also remained living in the house throughout the build, and the team were consistently respectful, considerate and easy to work with. I would have no hesitation in recommending Dean and his team and am already discussing future projects with him.
Dennis Plastering and Buildings services
Rating: 5 out of 5
Extension Builder in Cardiff
Dennis Building is small independent company based in Cardiff. I'm very flexible with availability & happy to help any customer. I cover all aspects of Internal building & carpentry. We cover all extensions , conversions and refurbs. We we specialise in Home /Room Renovations to a good quality standard.
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Latest review:
Conversions - General- 22 May 2026
Dan and his team were fantastic from start to finish! My wife & I were nervous going into the process of renovating our kitchen, but as soon as we met Dan we were immediately put at ease. He was flexible, positive, and reassuring, easily being able to work to our budget and realistic with time frames, and finished right on schedule! Above all else, Dan is an excellent communicator. I had some of the easiest, most straightforward exchanges with Dan that I've ever had when working with a professional. He would give regular updates on progress, and would be immediately transparent about any problems, setbacks, or surprises that came up along the way (as is the nature of renovation an old property such as this). All of the team were very respectful of our home and worked very hard the whole time they were there, big thanks to Greg, John, Aidan, Jamie, and Adam for their professionalism. They always had a great attitude and were a positive presence, and Greg's singing was a highlight!
10358580
Rating: 4.7 out of 5
Extension Builder in Cardiff
R&H Building contractors is South Wales based and undertakes general building and landscaping work.
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Latest review:
Bricklaying- 25 Jul 2026
Kieran was great. On time , great job completed and really well priced. We will be using him again on our next property.
Mark Mackinlay
Rating: 5 out of 5
Extension Builder in Cardiff
Hi I'm Mark, I am a bricklayer by trade and multi skilled tradesman having worked in construction for 30 years, working on major construction projects right down to simple garden walls, amassing a lot of skills, knowledge and experience. I pride myself in my work and satisfying my customers needs.
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Latest review:
Garden Maintenance- 6 Apr 2017
Pond removed and area turfed - i amended requirement during job and Mark stuck to quote - Job well done.
NP Construction and Landscaping
Rating: 5 out of 5
Extension Builder in Cardiff
Based in Cardiff, NP Construction and Landscaping provide building and landscaping services to customers across South Wales. Established in 2007 the company has many years experience in the construction and landscaping industry.
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Latest review:
Neal was prompt, friendly and very helpful arranging to see a repossessed house I was interested in doing up- the house was sold before I had a chance to put an offer in but I will certainly use him again if I need any quotes, advice and potentially work on future projects.
Elite Construction
Rating: 5 out of 5
Extension Builder in Cardiff
No matter what job you need doing here’s why you should choose Elite Construction. Our Builders are fully Qualified and undertake many different types of work to high standard. Here at Elite Construction we are enthusiastic, friendly, flexible and dedicated to providing you with a high standard of work. We are based in Barry, Vale of Glamorgan. We cover the whole of Cardiff and Vale areas. We take on all aspects of work from Stonemasonry, Landscaping and building
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Latest review:
Repointing- 12 Jul 2024
I am pleased with the work that Morgan and his team did on the chimney stack. All good!
CJA DAVIES BUILDERS
Rating: 5 out of 5
Extension Builder in Cardiff
WE COVER ALL ASPECTS OF BUILDING/LANDSCAPING WORK FROM PATIOS TO EXTENSIONS
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Latest review:
Extensions- 26 Apr 2025
The whole job was carried out by Cenwin and his brother Allen between the 22nd and 25th of April. The old pergola was removed completely and replaced with a superior design using first class materials and skills. My wife and I are extremely pleased with the new structure which has added a great look to our garden. We would have no hesitation in using this company again or recommending them to friends or neighbours.
Meredith Building Services
Rating: 5 out of 5
Extension Builder in Cardiff
We are Stephen and Dean Meredith, a father and son run construction company that pride ourselves on going above and beyond to not only provide the highest quality of work, but to make it as comfortable as possible for the client whilst doing so.
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Latest review:
First floor extension on existing ground floor extension to create master bedroom with ensuite. Also to fit some extra new windows on existing house, also new guttering, facias and sofits on entire property. I cannot fault Dean and his team one bit. From the quality of their work to their cleanliness it was always exemplary. I've recommended Dean and team to countless clients and some family members who needed a reliable builder and have only had positive feed back since. I'll be using Dean and team again on my next project 100%.