Transform your
vision into reality

Mark James Building Contractors are trusted local builders in Cardiff, Wales, specialising in house extensions, full renovations, kitchen refurbishments, bathroom refurbishments, new builds and commercial building projects.

We deliver high-quality workmanship, clear communication and reliable project timelines across Cardiff and surrounding areas

CET A FREE QUOTE

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Extensions

Create more space and add value with a well-built home extension—designed to fit your property and finished to a high standard.

Renovations

Full property renovations including layout changes, structural work, and complete modernisation—managed from start to finish.

Kitchen Refurbishments

Practical, modern kitchens installed with clean finishes, smart layouts and high-quality detailing.

Bathroom Refurbishments

Full bathroom upgrades including tiling, plumbing alterations and quality finishing for a modern feel.

New Builds

Support with new build projects from early stages through to completion, including structural works and final finishes.

Commercial Projects

Reliable commercial building work and refurbishments delivered professionally and on schedule.

WHY CHOOSE US?

Choosing the right builder matters. We focus on quality, clear communication and consistent workmanship on every project.

• High standards and tidy workmanship

• Reliable scheduling and clear timeframes

• Honest pricing and transparent quotes

• Friendly, professional team

• Excellent finishes and attention to detail

• Decades of knowledge and experience

" Mark is an established builder and contractor and someone you can trust to get the job done well. Him and his team are nice people and will always come back to sort out any issues. We’ve had two extensions with him and I would not hesitate to ask him again should I need further work doing "

Neil Hardingham

"Mark and his team are outstanding! Extremely professional, highly skilled and very accommodating, they certainly know what they are doing.. "

Robert kane

" Absolutely a dream to have working in the house an outstanding quality of workmanship, a great team of trades who seamlessly worked together.. "

Nicola franks

"Mark and his team were brilliant throughout the process. From the initial meeting to discuss what works we wanted to have done to the end result, the communication was great. His team are lovely, get the job done quickly and to a very high standard. Mark is thorough and efficient and we wouldn’t hesitate to use them again in the future. "

Katie Louise Fazackerley Mason

Frequently asked questions

Here are some common questions about our company.

Do you offer free quotes?

Yes — we offer free quotes for building work across Cardiff and surrounding areas.

What type of work do you specialise in?

We specialise in extensions, full renovations, kitchen refurbishments, bathroom refurbishments, new builds and commercial projects.

How far do you travel from Cardiff?

We typically work within around 45–60 minutes of Cardiff depending on the project

FULL LIST OF FAQs

Get a Free Quote from Cardiff Builders You Can Rely On

If you’re planning building work and want a reliable team with high standards, contact Mark James Building Contractors today

Transform yourvision into reality