Quality replacement windows

Based in Morden, Surrey, SCI are designers and installers of high quality Replacement Windows in Surrey & South West London.

We will discuss your requirements, advise you, and come up with the best, most attractive and practical window designs for your property.

Whether you choose PVCu, aluminium, French or traditional sliding sash windows, our replacement window systems will transform your property.

Replacement windows will add warmth, comfort and security to your home, increasing its value and saving energy.

Modern energy efficient double glazed units lose much less heat than older double glazing. This saves energy, reduces bills and makes your living space warmer.

The latest multi-point shoot bolt locks and locking handles are very strong and help keep you and your family safe, providing constant peace of mind.

Working throughout Surrey and South West London, creating a stylish look for your home, whilst ensuring you have a high level of security as well as increasing energy efficiency.

“All good 6 years later!”
Customer in London, November 2017
Replacement bay window - double glazing.
Read more reviews on Checkatrade

Our product range

PVCu windows

PlatinumNRG is one of the best performing products on the market providing the most energy efficient windows available.

Aluminium windows

Suitable for both traditional and contemporary styles Aluminium offers an excellent alternative to uPVC with slimmer sightlines and the ability to replicate steel crittal windows.

Sliding sash windows

uPVC vertical sliding sash windows are able to replicate the original timber windows so well whilst offering all the advantages of modern uPVC technology.


The FlushSash windows bring back the traditional timber appearance, with the sashes fitting flush into the frame.

Secondary double glazing

Aluminium secondary double glazing systems are virtually invisible from outside your house and offer good sound reduction, heat insulation and enhanced security.

10 year Guarantee

All window and door installations are covered by SCI’s 10 Year Guarantee. SCI also offers all its customers optional additional cover provided by the Independent Warranty Association (IWA) Insurance scheme.