Glass vs poly greenhouse: how to decide for a commercial project
Glass suits high-value, long-cycle, light-demanding crops in markets where energy is expensive and the structure is expected to run for decades: higher CAPEX, high and stable light transmission, tighter climate control and no recurring recovering cost. Film suits faster payback, lower CAPEX, phased expansion and hail-prone or low-labour-cost markets, accepting a recovering cycle every few years and looser climate control. Polycarbonate sits between them and is often used on sidewalls and gables rather than as a full roof.
The covering decision is not a taste question. It changes the structure, the heating and cooling load, the screen strategy, the achievable climate precision and the maintenance calendar for the life of the project.
What actually differs
- Light: glass holds transmission over many years; film degrades between recovering cycles
- Structure: glass requires a heavier, more precisely engineered frame, which raises steel and foundation cost
- Climate precision: glasshouses with screens generally hold tighter setpoints, which matters most for year-round production
- Energy: tightness and screen layers matter more than the covering material alone
- Hail, wind and dust: local exposure can outweigh every other argument
- Recovering: film has a recurring material and labour cost and a production interruption to plan around
Crop and market fit
- Long-cycle high-wire tomato, pepper and cucumber for year-round supply: glass is common where energy and market prices support it
- Leafy greens and herbs with short cycles: film often reaches acceptable results at far lower CAPEX
- Berries and nursery production: film and screenhouses are widely used, with structure driven by wind and rain protection
- Export programmes with strict quality windows tend to justify more climate control regardless of covering
How to price the decision honestly
Compare lifecycle, not CAPEX. Add the recovering cycles and their labour to the film case over the same period you depreciate the glass structure, and add the yield and quality difference your crop plan actually assumes — not a supplier's reference figure from another climate.
How to put it in the RFQ
If you are undecided, request both options as priced alternates on the same structure brief, with light transmission, design loads, screen configuration and expected covering life stated for each. That single instruction converts a philosophical debate into two comparable numbers.
Questions buyers ask before selecting a greenhouse company
SeedMatch Group is not a greenhouse manufacturer, integrator, EPC contractor or installer, and has no exclusive relationship with any company named on this page. Several of the companies described here can be invited to quote through a structured RFQ. Capability descriptions summarise categories these companies present publicly and should be verified directly with each company for a specific project.
What actually moves CAPEX per m² — country, crop, loads, climate strategy and automation.
Lifecycle view: CAPEX, energy, water, labour, replacement and cost per kg.
The definition checklist that makes proposals comparable in the first place.
Structured intake that produces one comparable scope for every bidder.
The 25-line normalisation method used before price is weighed.
Crop, climate, area, growing system and automation defined before suppliers are contacted.