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Clement manufacture an innovative range of steel windows, doors and screens for both private residences and commercial projects.
We provide a complete service – from the provision of technical drawings through to manufacture, installation and after sales support - whether your project is a traditional restoration project, one involving Listed Buildings or Conservation Areas, or a new build.

Our previous work includes prestigious heritage projects across the UK and in the USA, including landmark buildings such as Bonhams in London, Norwich City Hall and the El Dorado Building in Manhattan. We take pride in our reputation for premium products, excellent craftsmanship and industry expertise.

All our windows are crafted to your bespoke design in our ISO 9001 approved factory. Produced entirely from 100% recycled steel and generally Part L compliant, our windows are environmentally friendly and meet the latest performance requirements for insulation, weatherproofing and security. With Clement Windows you can expect technologically advanced, yet low maintenance steel windows, which will last for many years.

Clement also manufacture a selection of conservation rooflights, available from stock in either a tile or a slate profile.
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Featured Downloads

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Third party approval
Acclaim Health & Safety Certificate
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Technical data sheet
Developed in collaboration with the Hampstead Garden Suburb Trust and other conservation bodies, ...
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Product catalogue
Clement Conservation Rooflights are low profile and look fabulous in both slate and tile roofs. ...

Image gallery

800 new Clement steel windows for London hotel
A fabulous example of a Clement steel screen
Beautiful Clement EB24 steel windows and doors
Bespoke steel screens can create such an impact
Clement heritage roof windows in new extension
Clement replace 500+ steel windows at The Pithay

Quality Assurance

The Clement Windows Group is certified to the following Quality Assurance schemes/standards:
BS EN ISO 9001: 2015 – BSI


The Clement Windows Group provides goods and services in the following areas:

Trade names

Clement Conservation Rooflights
Clement SMW
Clement W20
Clement W40

Contact details

Clement House,
Weydown Industrial Estate,
Surrey, GU27 1HR
Tel +44 (0)1428 643393
Fax +44 (0)1428 644436