*A1 Sundries are normally delivered in 3-5 working days, however some non-standard products, or deliveries to remote postcode areas may take longer.


A1 SkyLIGHT™ Double-Glazed Roof Window




The A1 SkyLIGHT™ Double-Glazed Roof Window is an easy-to-fit roof window which provides natural light and warmth for traditional, felt-roofed wooden garden buildings. It’s simple design means that this skylight window is ideal for DIY fitting requiring no silicone or sealant to maintain its weather integrity. The skylight window comes with 18mm double-glazed toughened glass, and is extremely long-lasting, designed to be tough and durable in all environments. It weighs less than 7.5kg, and is suitable for fitting to any thickness of roof material and any design of building including sheds, workshops, summerhouses, garden offices, garages and log cabins. The A1 SkyLIGHT Double-Glazed Roof Window can be fitted to most brands of garden building, and is available as a fixed unit, or with an opening brass screw jack.


  • Straightforward installation
  • British Standard toughened safety glass
  • Approximate size 50x50cm
  • 18mm thick double-glazed units
  • Suitable for felt-covered wooden & OSB roofs
  • Self-sealing frame doesn’t require additional sealant
  • Ideal for DIY retro-fitting
  • Fixed or opening units
  • Fully weather tight
  • Stainless steel fixings
  • Skylight includes all fixings and trims


Frequently Asked Questions

Q:What is the minimum and maximum roof pitch the window can be fitted to?
A: The window can be fitted to any pitch from 5° to 45°.

Q: What is the minimum and maximum thickness of roof material the window can fit to?
A: The skylight comes with 40mm bolts to fit a timber thickness up to 15mm, however we can also supply 50mm bolts for timber up to 25mm.

Q: What size is the window?
A: The window is approximately 50x50cm on the outside.

Q: What space do I need between the rafters on the roof?
A: There needs to be a minimum space of 500mm between the rafters to accommodate the width of the skylight window.

Q: My roof is OSB is this still suitable?
A: Yes, the window can be bolted to any material including OSB, chipboard, tongue & groove, or wooden planks.

Q: Do I need any special tools or skills to fit one?
A: No special skills or tools are required, and any competent DIYer can install the window in less than 2 hours.

Q: Where is the best place to fit my window?
A: Ideally, as near to the top ridge line as possible. Make sure it doesn’t cross a vertical joint in your felt line or clash with an internal purlin.

Q: My felt runs horizontally. Is this OK?
A: Yes, it is perfectly acceptable to fit the window across horizontal felt lines.

Q: Can I fit more than one window to my workshop?
A: Yes, the more the better.

Q: Do you supply the sticky glue/sealant with the kit?
A: Yes, you don’t need any additional sealant or glue to install the skylight as it comes with an oil based compression gasket which ensures a good seal.