Beautifully fitted windows, doors and conservatory upgrades for modern homes.
Based in Llanharan, we deliver premium craftsmanship, expert installation and tailored solutions for homes throughout South Wales.
Why homeowners choose us
Craftsmanship, reliability and premium finishes.
Tailored installations
Solutions designed around your home, style and budget.
Energy-efficient upgrades
Improved comfort, insulation and long-term performance.
Local expertise
Serving Cardiff, Bridgend, Newport, Swansea and beyond.
Professional finish
Clean installation, refined detailing and lasting quality.
Proud to install products from leading manufacturers
Our services
Beautifully installed products for every part of the home.
Why choose Jon Thomas Windows
A premium installation experience, from first visit to final finish.
We bring together refined design, reliable workmanship and a genuinely personal service to create homes that look beautiful and perform brilliantly.
Expert fitting
Professionally installed products with a clean, polished finish.
Trusted quality
High-performance materials and dependable aftercare.
Recent projects
A sample of our recent installations.
Composite door refresh
Secure entry upgrade with a premium finish and improved kerb appeal.
Conservatory roof transformation
Lightweight tiled roof installed for year-round comfort and a more elegant finish.
Bay window upgrade
Added light, space and architectural character to an existing family home.
Areas covered
Serving homes across South Wales and the surrounding communities.
From Cardiff and Bridgend to Newport, Swansea and Rhondda Cynon Taf, we work with homeowners who want premium solutions delivered with care.
“The team were professional from start to finish and the finish was exceptional. Our new doors look fantastic.”
— Sarah M.
“Great communication, excellent workmanship and a real improvement to the home.”
— David P.
FAQ
Common questions from homeowners.
Ready to upgrade?