Polyhouse Farming ROI — Is the Investment Worth It?

A polyhouse is not a magic money machine. It is a capital investment that increases yield per square metre, extends the growing season, and reduces crop failure risk from rain and pest pressure — in exchange for a large upfront cost and ongoing operating expenses. Whether it makes financial sense for your farm depends entirely on what you grow, how you sell, and whether you can access the government subsidy that cuts the cost in half.

What Does a Polyhouse Cost?

A standard naturally ventilated polyhouse (NVPH) in Karnataka costs ₹8–12 lakh per acre for structure, film covering, drip irrigation, and installation. A hi-tech polyhouse with fan-pad cooling and automated fertigation runs ₹18–25 lakh per acre.

The National Horticulture Mission (NHM) subsidises 50% of the project cost for polyhouse construction, up to defined limits. For a 1-acre NVPH, the effective farmer cost after subsidy is ₹4–6 lakh. The subsidy is disbursed after inspection — you fund construction first, then receive reimbursement within 60–90 days.

Year 1 Crops and Revenue

Capsicum (colored bell pepper) is the benchmark polyhouse crop in Karnataka. Under polyhouse conditions, yield is 25–30 tonnes per acre versus 8–12 tonnes in open field. Market price for polyhouse-grade colored capsicum averages ₹40–80/kg depending on season, giving gross revenue of ₹4–6 lakh per acre per crop cycle (two cycles per year possible).

Cherry tomato under polyhouse yields 20–25 tonnes/acre with a market price of ₹50–100/kg at direct sale, making it even more profitable but more perishable. Cucumber yields 30–35 tonnes/acre with faster turnover (harvest starts 45 days after transplanting).

Running costs per year: electricity for drip pumps ₹30,000, labour ₹50,000, bio-inputs and nutrients ₹30,000, film replacement (every 3–4 years, prorated) ₹12,000 = approximately ₹1,20,000/year.

Break-Even Analysis

Break-even at 2.5–3 years assumes consistent sales at direct/wholesale premium prices and two crop cycles per year. If selling at mandi rates, break-even extends to 4–5 years and the investment becomes questionable.

Risks to Include in Your Calculation

Hailstorm: A severe hailstorm can tear polyhouse film, costing ₹1.5–2 lakh in replacement per acre. Insurance under PMFBY (Pradhan Mantri Fasal Bima Yojana) is available for polyhouse structures — enrol before the season.

Disease pressure inside poly: The enclosed humid environment accelerates fungal diseases (botrytis, powdery mildew) if ventilation is poor. Organic management requires weekly neem and trichoderma applications plus strict plant spacing. This is manageable but demands attention.

Market dependency: Polyhouse revenue only justifies the investment when selling to premium buyers. If your only outlet is the local APMC mandi, a polyhouse is unlikely to pay off. Build your direct buyer base — restaurants, subscription boxes, exporters — before or simultaneously with polyhouse construction.

For farmers who have the capital access (own funds + NHM subsidy), an existing buyer relationship, and the discipline to manage year-round intensive cropping, a polyhouse is one of the highest-return farm investments available in Karnataka.

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