Capital Windows have supplied Aluminium and PVC windows, doors and conservatories throughout London and the Home Counties for over 25 years.

Capital Windows offer an extensive choice of New Generation Aluminium windows and entrance doors, composite doors, patio doors, Bi-fold doors, porches and conservatories to the discerning home owner. Energy efficient and with enhanced security features, our windows and doors will add comfort and value to your home. All our bespoke conservatories, double-glazed windows, entrance and patio doors are available in a wide choice of colours and finishes. Click the links below to view details of our extensive ranges.
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High performance Energy efficient double glazing
The Capital Windows combination of state of the art aluminium frames and high performance energy rated double glazing forms a critical part of the energy efficiency of our windows, tackling climate change by reducing CO2 emissions and adding up to considerable savings on energy bills for homeowners across Greater London and the Home Counties.
Product and Installation Guarantees
Capital Windows provides a 10 year guarantee on all installations carried out by our expert installers. Importantly for our customers, Capital Windows are, long standing members of the Glass and Glazing Federation (GGF), a FENSA registered company and provide Document L compliant windows, doors and conservatories. 
Visit our Uxbridge Factory showroom
To view our latest range of energy efficient aluminium windows including traditional style casement windows,Tilt & Turn windows and aluminium vertical sliding sash, PVCu windows, entrance doors including popular composite doors, french and patio doors, bi-fold "folding" doors and conservatories - click here for directions to our Showroom. 
Bring along your sizes or building plans
Explore the possibilities. We manufacture many of our products on site at Uxbridge and a visit to the showroom can provide a potential customer with a greater knowledge and understanding of how our products are made. Bring along an outline sketch of your requirements including approx. dimensions etc. and we will be happy to provide you with some budget prices. At busy times we recommend that you make an appointment and one of our experienced sales advisors will be happy to show you around.