Extension Builders in Cardiff | MyBuilder

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Some of our top rated extension builders in Cardiff

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Randall’s
Rating: 5 out of 5
Extension Builder in Cardiff
Randall’s are proud to offer a range of building services.
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Latest review:
Garden Maintenance- 11 Jun 2021
Firstly communciation with Eliot has been consistant from the start. Date and time were agreed and as a job cancelled he came to us sooner on the day which was great. Our garden was like the Amazon to the front and he has done an amazing job. Cracked on straight away, clean, tidy, very professional and as well as polite and friendly. We are happy to have Eliot as our permanent gardener. Would i recommned Yes of course.
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- 29 Apr 2026
James and his team did an incredible job building a one storey rear extension on our property. James listened to what we wanted and made our dream a reality. We absolutely love it and cannot recommend him enough.
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
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.
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.
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 👍
MLT Brick & Stone
Rating: 5 out of 5
Extension Builder in Cardiff
Hi all my names Mike Bricklayer by trade specialise in brick work and stone work do a variety of work such as home extensions, brick walls, stone walls, patios and steps all aspects of building work all the way to the little repair jobs. very professional, reliable and quality work workmanship get in touch.
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Latest review:
Bricklaying- 4 Jul 2026
Great communication very professional and friendly.Excellent job and very clean and tidy.Attention to detail was fantastic and very reasonably priced for a stone wall reconstruction. Thanks again Michael much appreciated
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.
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- 8 Oct 2018
Kieran was on time for his visit to quote and started the job on time on the day he said he would - no delays. His work is spot on and he talked me through everything he did. He pays attention to detail and has excellent customer care - cleaned up after himself and left the property neat and tidy. Trusted him with our keys while we were away. The quality of his stone work is excellent and his prices very reasonable - quote for the job and not the time it takes - this is the biggest thing for us as the price is never a worry . I`d recommend Kieren as a very conscientious and punctual tradesman with high quality work and an excellent finish on the job.
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.
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.
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!