Energy-Efficient Windows Across Kent & London
Supply and installation of premium uPVC and aluminium windows — casement, sash, flush and heritage styles — for homes across Kent, London and the surrounding 30-mile region.
Replacement windows to suit every home.
From uPVC casement, sculptured, contemporary, flush sash and vertical sliding sash windows to slimline aluminium casement, flush sash and heritage systems — supplied and installed across Kent and the surrounding region.
Windows we supply and install.
Energy-efficient, low-maintenance casement windows in a wide choice of colours
Slim, strong and modern — with larger areas of glass and more light
A classic, softer window style with modern security and thermal performance
Slim steel-look styling with modern aluminium performance
Timber-style flush appearance with modern energy efficiency and security
Traditional sash appearance with smooth operation and modern security
Supplied, fitted and guaranteed by our own team.
From your first enquiry to the final installation, Sumner Windows looks after the whole process — helping you choose the right window style, colour and glazing for your home. Every installation is energy efficient, secure and built to last, with low-maintenance frames and a clean, professional finish.
About Sumner Windows →Trusted by homeowners across Kent and London.
“From the first visit to the final fit, Sumner Windows made replacing our windows easy. The new uPVC casements look fantastic and the house is noticeably warmer.”
“We chose anthracite grey aluminium windows and could not be happier — slim, modern and beautifully finished. Tidy, professional installation throughout.”
“They replaced our old sash windows with new vertical sliders that keep the character of the house but cut out the draughts completely. Highly recommended.”
Planning a project? Let's talk.
Free site visits across Kent and London — we'll discuss your project, take measurements and quote in full.