Glass vs Polycarbonate Greenhouses
The greenhouse covering material sets 20 years of light transmission, heating cost and hail risk. Here is a vendor-neutral comparison of tempered horticultural glass and multi-wall polycarbonate for commercial protected agriculture.
Tempered horticultural glass
Diffused or clear tempered glass on Venlo or wide-span steel — the reference material for high-tech greenhouses.
Advantages
- Highest light transmission (≈ 90–92%) and best diffused-light options
- Design life 25+ years with almost no optical degradation
- Best fit for high-value long-cycle crops (tomato, pepper, cucumber, cannabis)
Limitations
- Highest CAPEX per m² — steel structure must carry the extra weight
- Hail and impact damage requires panel replacement, not patching
- Higher heating demand without thermal screens or double glazing
- CAPEX:
- €180–350/m² turnkey (structure + glass + basic climate)
- OPEX:
- Lower per-kg of crop for long-cycle high-value produce
- Best for:
- Northern Europe, high-tech export tomato/pepper/cucumber, cannabis, breeding facilities
Twin- or triple-wall polycarbonate
6–16 mm multi-wall polycarbonate on lighter steel — the workhorse for mid-tech and warm-climate greenhouses.
Advantages
- 20–30% lower CAPEX than glass, lighter structure
- Better thermal insulation (lower U-value) than single glass
- Impact and hail resistant — critical in tropical and highland climates
Limitations
- Lower light transmission (≈ 80–85%) and gradual UV yellowing after 8–12 years
- Shorter design life (10–15 years vs 25+ for glass)
- Diffusion options less controlled than diffused horticultural glass
- CAPEX:
- €120–220/m² turnkey (structure + polycarbonate + basic climate)
- OPEX:
- Lower heating cost; higher long-term replacement CAPEX
- Best for:
- Africa, MENA, LATAM, highland tropics, mid-tech tomato / leafy / nursery projects
Our verdict
Choose glass when the crop is high-value, the market is long-cycle export and financing horizons exceed 15 years. Choose polycarbonate when hail risk, heating cost or CAPEX ceiling dominate — the payback difference reverses in most warm and highland climates.
Independent guidance from a human-led sourcing platform — we do not resell equipment. Ranges are indicative and shift with project size, geography and financing structure.
FAQ
- Is glass always better for light transmission?
- Not always. Modern diffused horticultural glass delivers 90–92% PAR transmission with excellent light distribution, but modern anti-drip AR-coated multi-wall polycarbonate reaches 85% with better thermal insulation. For very long-cycle high-value crops, glass wins on cumulative light; for short-cycle mid-tech projects, polycarbonate often wins on total cost.
- What about ETFE and film greenhouses?
- ETFE cushions and multi-layer polyethylene film are alternatives but sit outside this comparison. ETFE is used mainly in flagship projects with unusual geometry; polyethylene film is the standard for low-tech tunnels and short-cycle production. Both can be added to your RFQ.
- How does hail insurance affect the decision?
- In hail-prone regions insurers price glass greenhouses at 1.5–3× the annual premium of polycarbonate structures. Over a 15-year horizon this can offset the CAPEX difference. Ask your broker to quote both materials before finalising the specification.
- Can I mix glass roof and polycarbonate sidewalls?
- Yes, and it is common. Diffused glass roof for maximum PAR plus twin-wall polycarbonate sidewalls for insulation and impact resistance is a proven configuration for Venlo greenhouses in continental climates.
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