Start with what matters most in your greenhouse: a clear view, privacy, less solar heat or easier cleaning. JUPA KAS offers the following glazing options. Check availability for your model.
4 mm toughened glass
Choose clear toughened glass if you want an unobstructed view into the garden. It is heat-treated and, if it breaks, typically fragments into small pieces.
Frosted glass
Frosted glass lets light in while obscuring the view. Consider it for panels facing neighbours or a seating area where you want more privacy.
Solar-control glass
Solar-control glass reduces the solar heat passing through the glazing. It can suit a sunny site. Compare light transmission for the specific glass and plan ventilation as well.
BIOCLEAN self-cleaning glass
Daylight activates an exterior coating that helps break down organic dirt. Rainwater spreads across the surface and helps rinse it away. Sheltered panels can still need occasional rinsing. How BIOCLEAN works
6 mm polycarbonate
Polycarbonate is a lightweight alternative to glass. Check the panel’s light transmission and insulation specifications, since these depend on the panel construction.
Start with the view you want from inside
Stand where the greenhouse will go and look out from the height of a chair. If the main view is across a flower border or lawn, clear glazing can make that view part of the room. If one wall faces a shared path, frosted glazing can soften the view from that side. Ask whether your model can combine clear and frosted panes, and confirm which positions are available before you plan the layout.
For a greenhouse used mainly for growing, look at the light available at bench height. A tall boundary wall or dense hedge can already shade the lower part of a greenhouse. Walk around the proposed site on a bright morning and again in the afternoon, and note which areas remain bright enough for the plants you want to grow.
Compare samples in daylight
Ask to see samples of the clear, frosted and solar-control glass you are considering. Look through each sample towards greenery and then hold it against a bright sky. The first test helps you judge how much of the garden you can see. The second shows how the glazing looks in direct light. For solar-control glass, ask for the light transmission and solar heat figures for the specific product so you can compare options on the same basis.
If you are deciding between 4 mm toughened glass and 6 mm polycarbonate, ask for the exact panel specification. Thickness alone cannot tell you how two materials compare for insulation or light transmission. Check which panel is intended for the roof and which is available for the walls. Also ask how a single damaged panel can be replaced and whether replacements can be ordered for your model.
Plan for cleaning before choosing a roof
Look at what is above the greenhouse. A roof under trees is likely to collect leaves and other debris, while a roof out in the open has more direct exposure to rain. If you are considering Bioclean self-cleaning glass, ask where the coated surface goes, which cleaning products are suitable and how to care for areas that rain does not reach easily. Leave enough room around the greenhouse to reach the sides for routine cleaning.
Choose glazing for a greenhouse that doubles as a garden room
Imagine a greenhouse with seedlings at one end and a small table at the other. The seedlings may benefit from the brightest available spot in spring, while the table might be more comfortable away from strong afternoon sun. Mark both zones on a sketch and compare how different glazing choices would affect each one. Include the door and roof vents on the same sketch. Shade and airflow both influence how comfortable the seating area feels.
Before ordering, send the supplier your sketch, the model you are considering and a photo showing nearby walls and trees. Ask for a written list of the available glazing options, with the roof and wall panels identified separately. That gives you something concrete to compare when choosing between a clearer view, more privacy, lower solar gain and easier upkeep.
Questions to ask when comparing quotes
Check which glazing is included in the base price and which choices are optional. Ask whether an upgrade applies to the whole greenhouse or only to the panels you select. Two quotes can look similar until you compare what each includes for roof glazing, doors and vents.
Ask how the glazing is delivered and what happens if a pane arrives damaged. Find out whether the installer fits all the options you are considering and whether the maintenance instructions differ between them. Keep the product name or panel reference with your order. If you need a replacement several years later, that reference is more useful than a description such as clear glass or frosted glass.