Green Building Store is now 21°


Installation & Aftercare

21° prides itself on offering a friendly and responsive aftersales service for our windows and doors. Please take a look at our downloads and videos below and contact the aftersales team for any issues.


Care & maintenance

Correctly installed and maintained, our high performance windows will give many years of trouble-free operation.

Ventilation and heating should be provided as soon as possible after fitting, in order to bring the frames to their normal service conditions. Timber windows need regular cleaning and care to ensure full service life and functional performance. In order to ensure a smooth and trouble-free operation, we recommend six-monthly inspections of all finishes and clean glass with proprietary cleaners for glass surfaces. Lubricate or oil moving parts and locking points at least once a year and check all important components for looseness and wear.

Download our handy guides on keeping your new windows maintained after installation and instructions for on-site care.

Up to 10 year warranty on all frames, glazing, hardware and finishes for your windows.

Our frames, glazing, window hardware and finishes are guaranteed against defective materials or workmanship for a period of 10 years from the date of your delivery and installation.

21° are often my first choice - not just because they offer excellent products but because their customer support and aftercare is second to none.

Gil Schalom, GSD Architecture


  • Yes, we do! Our fitting service operates throughout the UK.

  • Yes, these are sent out with each order.

  • Yes, we do! Please contact the team for more information.

  • Yes, we use 3 star Brisant ULTION cylinders and our hardware is all multi point locking.

Questions about your delivery & installation?

We're here to help. If you have any questions or doubt regarding the delivery or installation of your windows, we'll support with every step on the journey.

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