Windows
Slimmer frames.
Warmer rooms.
Aluminium and uPVC windows engineered for British weather, tested for security and made to measure for your home — from Victorian terraces to new builds.
Why aluminium?
Strength that lets
the glass do the work.
Aluminium is far stronger than uPVC, so frames can be slimmer without losing strength.
The result is larger glass areas, brighter rooms and clean sightlines that suit modern and traditional homes alike. It won't warp, rot or rust, and powder-coated finishes keep their looks with almost no upkeep. Prefer uPVC? We fit that too, and we'll tell you honestly which suits your property and budget.
Smart Systems
Alitherm 400 & Heritage
Slim, secure aluminium — or the elegant steel look of Alitherm Heritage.
Cortizo
Cortizo casement windows
A 70mm frame with a deep 32mm thermal break. Standard or flush.
Rehau & Cortizo
uPVC & hidden-sash windows
Rehau uPVC windows and the Cortizo Cor 70 Hidden Sash. Ask us about both.
Period properties
Character kept. Performance gained.
Alitherm Heritage recreates the slim lines of original steel windows with a modern, thermally broken aluminium system — widely accepted for conservation projects where new windows must match the old.
Free design consultation
Tell us about your project.
No pressure, no obligation. We'll talk through proportion, profile, colour and glass, then arrange a survey if you'd like to go further.
- Call020 3835 2583
- Mobile / WhatsApp07925 678210
- Emailinfo@4moonwindows.co.uk
- HoursMon–Fri · 08:00–17:30
Request received
Thank you.
A member of the 4Moon team will call you back to arrange your free design consultation. If it's urgent, call us on 020 3835 2583.