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Our Building & Construction Services in Cardiff

At Mark James Building Contractors, we provide professional building and construction services across Cardiff and surrounding areas in South Wales. We take pride in high standards, clear communication, and quality workmanship—whether you’re planning a small refurbishment or a major renovation project.

If you’d like advice or a quote, get in touch and we’ll talk through your plans.

an extension of a house which allowed an open plan kitchen

House Extensions

Looking to create more space in your home? We build high-quality extensions that add value and improve how you live day-to-day.

Extension work can include:

  • Single-storey extensions

  • Rear and side extensions

  • Knock-throughs & open-plan layouts

  • Structural alterations & steelwork

  • Full build finish including electrics, plumbing and plastering

Ideal for growing families and improving layout without moving house

A property that had a total renovation

Full Property Renovations 

If your home needs modernising, reconfiguration, or a complete upgrade, we can manage a full renovation from start to finish.

Renovation services can include:

  • Complete strip-out and refit

  • Re-plastering & decorating

  • Flooring, joinery and carpentry

  • Internal wall changes

  • Rewiring and plumbing coordination

  • Full project management

A kitchen renovation showing a new kitchen

Kitchen Refurbishments

A well-designed kitchen can completely transform your home. We install kitchens to a high standard with clean finishing and practical layouts.

Kitchen works often include:

  • Removal of old kitchen

  • First fix electrics & plumbing

  • New kitchen installation

  • Worktops, tiling & splashbacks

  • Flooring and decorating

Bathroom Refurbishments

We provide full bathroom refurbishments with a focus on durability, waterproofing, and a quality finish.

Bathroom refurbishments can include:

  • Full rip-out and replacement

  • Plumbing alterations

  • Tiling and flooring

  • Shower enclosures, baths and vanity units

  • Ventilation improvements

a new house build

New Build Projects

We support new build construction projects and can work on full builds or specific stages depending on your requirements.

New build services may include:

  • Groundworks coordination

  • Brickwork and structural build

  • Roofing and external works

  • First and second fix carpentry

  • Full internal finishing

A commercial care home built

Commercial Building Work

We also take on commercial building and refurbishment work for businesses across Cardiff and nearby areas.

Commercial services may include:

  • Office refurbishments

  • Fit-outs and upgrades

  • Ongoing maintenance

  • Working to site schedules and deadlines