About Us
A Family Business
Built on Quality.
A1 Window Construction Ltd has been a trusted name in windows, doors and glazing across Cheam, Sutton, and the wider London and Surrey area for over 15 years.
15+
Years experience
Who We Are
Founded and run by Will, A1 Window Construction Ltd is a family business where reputation is everything. Every job — whether it's a single bathroom window or a full architectural glazing project — receives the same attention to detail and commitment to a clean, professional finish.
Will and Sam have been working together for over a decade. Between them, they have fitted thousands of windows and doors across London and Surrey — from period Victorian terraces to contemporary new builds and large commercial premises.
We are not a franchise, not a sales company, and not a call centre. When you contact us, you speak directly with the people who will be on your property. That is how it has always been, and how it always will be.
Family-run — Will and the team treat every home with the same care as their own
15+ years of hands-on installation experience across London and Surrey
Domestic and commercial — from single replacements to full architectural glazing
Made-to-measure products, precision-fitted, clean and tidy on every job
Full project management from written quotation to final sign-off
How We Work
What Sets Us Apart
Precision & Quality
Every frame is measured twice, fitted once. We do not rush jobs, and we do not cut corners — your home deserves better than that.
Cleanliness & Respect
We protect your floors, clear up fully, and leave your home as we found it — just with better windows and doors.
Honest Communication
Written quotes, realistic timelines, and direct contact with Will or Sam throughout. No surprises on the day.
Repeat Business
Many of our customers have used us two, three and four times. That is the clearest measure of our standard.
Get in Touch
Ready to Start
Your Project?
All estimates are completely free, written, and provided with no obligation. Will or Sam will visit your property and give you a clear quote before any commitment is made.
Get a Free Quote