Welcome to GIS Windows
Double Glazing North London
“We have a reputation to protect and we pride ourselves on getting the job done professionally”. We believe our action are one of an environmentally friendly company which recycles or reuses waste wherever possible.
Windows North London
At GIS Windows we are rightly proud to be double glazing suppliers and manufacturers. With 34 years of experience, we have strived to supply the highest quality double-glazed windows, doors and conservatories with the best customer service. Our team has built up an enviable reputation for honest, factual and friendly service, which extends far beyond the sales room Unlike many double glazing suppliers and windows manufacturers all of our products are produced in the groups own factory ensuring total control of the process.