• Windows

    SCI are independent window suppliers and installers of high quality, bespoke double glazed uPVC, aluminium, sliding sash windows and energy rated windows.

  • Doors

    SCI are independent door suppliers and installers of high quality, bespoke uPVC, composite, patio, french and bi-fold doors.


Quality Replacement Windows & Door Specialists

Covid-19 – Lockdown January 2021

During the third lockdown we are remaining open for business and installations strictly within the governments guidelines. Our showroom is closed from Wednesday 4th until the lockdown is lifted.

Our suppliers are still manufacturing although their lead times are even more extended and they are also all suffering supply chain issues that are causing them to miss deliveries to us.

Please do contact us by telephone on 020 8648 0426 or email on office@sciwindows.co.uk and we will respond to you as soon as we can.

The health and safety of our staff and customers is paramount at this time and we hope you all remain safe and well through this period. Thank you for your ongoing support.


As a homeowner you need to be sure you are choosing the right replacement window company, one that will provide quality products, great service and value for money.

SCI has been doing this for over 30 years.

With around 10,000 satisfied replacement window and door customers, SCI has thrived on quality, innovation and customer care. Our customers appreciate the no pressure, no hassle approach and commitment to service – long after the installation has been completed.

We supply & fit top quality products

Replacement Windows

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

Replacement Doors

Whatever type of door you are looking for our replacement door systems will transform your property.