Core Sash Windows | Your North London sash window double glazing & refurbishment specialists

We are thrilled with our new windows. Immediately we had a quieter, more solid house and they have given the place a real lift. We are also looking forward to winter now as we cant wait to be snug indoors for a change!" ...more
A. Gough E8
We were very happy with the work completed by the Core Sash Windows team. They were polite, punctual and hard-working, and made every effort to minimise the disruption, tidying up and cleaning their work areas at the end of each day." ...more
R. Pendry N16
Core Sash Windows conducted a complete double glazed refit of our period windows to our family home, and we could not be happier with the end result. The craftsmanship was absolutely first rate." ...more
Nick - Muswell Hill
We found Core Sash Windows to be efficient and reliable. We had five old windows replaced with new double glazed sashes and we are now much warmer as a result. They started the whole job when they said. " ...more
Dominic - NW5
You said my unloved and neglected original sash windows would look like new after youd finished with them and they absolutely do. We were really pleased with the way your team worked over the time they were here" ...more
F. Byrne - N8
We had recently our sash windows replaced with new doubled-glazed ones and draught proofed. The speed and tidiness of Core Sash Windows was amazing. Rarely do you come across such professionalism in building works. " ...more
G. Grieve - N10
I love my new windows. My house is suddenly much quieter and warmer which is brilliant. Having any workmen in your house is very disruptive but the guys from Core were great." ...more
M. Massey - N4
We are really happy with the work done by Core Sash Windows. The team were friendly and professional and did a thorough job cleaning up at the end of each day. We now have beautiful windows." ...more
Mrs. G. Soklakov - E3

Click on one of the glass panes below for more information on

Double Glazing

Improves energy efficiency, reduces heat loss, improves sound insulation and adds value to your home.
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Draught Proofing

Like your current window only better!
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Full Restoration

Existing windows will be made to look and work like new as the windows are fully repainted. lifespan is increased and draughts and rattles will be a thing of the past!
Did we mention, includes full repainting and draught proofing?
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Sash Window Hardware

Click here for pics and descriptions of the different styles and finishes we can offer.
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Please get in touch with any queries and we look forward to hearing from you!