How do I build a commercial mushroom farm in India?

A commercial button-mushroom farm is built as a cluster of insulated, climate-controlled grow rooms (typically 18×30 to 18×70 ft) on a raised RCC plinth. The structure is a hot-dip galvanised MS portal frame clad with 60 mm PPGL PUF wall panels and 80 mm PPGL roof panels, each room fitted with a 6–12 TR refrigeration + fresh-air system, a double-door airlock, screened intakes, and a sloped washable floor. Around the grow rooms you add Phase-1/Phase-2 compost yards, a spawn store, packing/cold room, and utilities. Civil work and boundary are usually in the client's scope; MushroomWale delivers the panels, structure, machinery and controls turnkey.

What thickness of PUF panel is required for a mushroom grow room?

Use 60 mm PPGL PUF panels for walls and 80 mm PPGL for the roof. The roof carries the highest solar load, so it gets the thicker core. PPGL (aluminium-zinc / Galvalume coating) is mandatory over plain PPGI because the room runs at 85–95% relative humidity for years — PPGI corrodes, PPGL does not. Panel density should be 40 ±2 kg/m³ for structural rigidity and stable thermal performance.

What is the yield per square metre in a mushroom farm?

A well-run button-mushroom room yields about 18–22 kg per square metre of bed area per cycle (roughly 20–25% biological efficiency on Phase-2 compost), with 6 crops a year. Yield depends on compost quality, spawn, casing, and how tightly you hold the cropping set-points (16–18 °C, 85–90% RH, CO₂ under 1,000 ppm). The 7-tier racking multiplies usable bed area, so an 18×70 ft room with ~380 m² of bed area can produce several tonnes per cycle.

How much land do I need to build a mushroom farm?

Plan for the room footprint plus about 55% extra for circulation, compost yards, packing, cold storage and utilities. As a rule of thumb, a 4-room 18×70 ft unit needs roughly 7,000–8,000 ft² of built and working area (well under a quarter acre), while a full integrated unit with its own compost line needs 0.5–1 acre. Always leave room for future expansion of grow rooms and a second compost batch line.

What engineering services does a mushroom farm need?

Four core systems: (1) Refrigeration sized per room (6 TR for 18×30 up to 12 TR for 18×70) with fresh-air handling and CO₂ exhaust; (2) stabilised, DG-backed power so compressors never stall; (3) water supply plus drainage with a trapped, sloped floor; and (4) controls — thermostats, humidity and CO₂ control, and ideally automation/data logging. Get the heat-load and electrical sizing done before you order panels, because room size drives every downstream spec.

A brick plinth being laid for a MushroomWale grow-room block

Construction & Engineering

How to Build a Commercial Mushroom Farm: Structural & Engineering Requirements

A technical know-how guide to mushroom farm construction in India — room sizing, PUF panel specifications, structural design, refrigeration sizing, drainage, biosecurity and yield per square metre for new facility planning.

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Written by MushroomWale Engineering TeamEPC & Cultivation Specialists, Agrimotion Engineering Pvt LtdICAR-DMR Solan: joint educational collaboration, not a certification

The short answer

What does it take to build a commercial mushroom farm?

A commercial mushroom farm is a cluster of insulated, climate-controlled grow rooms on a raised RCC plinth. Each room is a hot-dip galvanised MS portal frame clad with 60 mm PPGL PUF wall panels and 80 mm PPGL roof panels, fitted with a 6–12 TR refrigeration and fresh-air system, a double-door airlock, 32-mesh screened intakes and a washable sloped floor. Sized correctly, each square metre of bed area yields 18–22 kg of button mushrooms per cycle across 5–6 cycles a year. Civil and boundary work are typically client scope; the panels, structure, machinery and controls are delivered turnkey.

Grow Room Sizes, Bed Area & Yield

Room size	Floor area	Bed area (7-tier)	Yield	Refrigeration
18×30 ft	540 ft²	7-tier rack, ~150 m² bed area	18–22 kg/m²/cycle	6 TR (72,000 BTU)
18×40 ft	720 ft²	7-tier rack, ~210 m² bed area	18–22 kg/m²/cycle	8 TR (96,000 BTU)
18×60 ft	1,080 ft²	7-tier rack, ~320 m² bed area	18–22 kg/m²/cycle	10 TR (120,000 BTU)
18×70 ft	1,260 ft²	7-tier rack, ~380 m² bed area	18–22 kg/m²/cycle	12 TR (144,000 BTU)

Yield figures are approximate, based on Phase-2 compost at 20–25% biological efficiency and tight climate control (16–18 °C in cropping, 85–90% RH). Actual output varies with compost, spawn and operations.

Material Specifications

Wall PUF panel

Spec: 60 mm thickness, PPGL coating both faces (never PPGI), density 40 ±2 kg/m³

Why: Holds 16–18 °C against 40 °C+ Indian summers with minimum compressor load

Roof PUF panel

Spec: 80 mm thickness, PPGL coated, with internal gutter slope

Why: Roof gets maximum solar gain — thicker core stops heat ingress and condensation drip

Flooring

Spec: RCC with 1:100 slope to drain, epoxy or anti-skid finish

Why: Daily washdown, drainage of casing water, and hygienic cook-out

Doors

Spec: Insulated PUF flush doors with airlock lobby, magnetic gasket seal

Why: Stops temperature loss and fly ingress between rooms

Structure

Spec: MS / GI hot-dip galvanised portal frame, anti-corrosion primer

Why: Carries panel + rack load in a permanently humid (85–95% RH) environment

Engineering Systems

Refrigeration & Air

6–12 TR per room sized on heat load, with fresh-air handling and CO₂ exhaust to hold 16–18 °C and 85–90% RH year-round.

Power & Backup

Stabilised supply with DG backup sized for compressor starting surge so climate never breaks during outages.

Water & Drainage

Clean water supply plus a 1:100 sloped, trapped floor drain connected to a soak pit or ETP for daily washdown and cook-out.

Eight-Point Construction Checklist

Level, compacted plinth raised 300–450 mm above ground to prevent flooding.

Galvanised MS portal frame designed for panel dead load + 7-tier rack live load + wind.

60 mm PPGL wall panels, 80 mm PPGL roof panels — sealed joints, no thermal bridges.

Double-door airlock lobby at every grow-room entrance for biosecurity.

RCC floor with 1:100 drainage slope and trapped gully connected to a soak/ETP.

Refrigeration sized per room (6–12 TR) with fresh-air handling and CO₂ exhaust.

32-mesh insect screen on every fresh-air intake; sealed cable and pipe penetrations.

Dedicated DG backup and stabilised power for compressors and air handlers.

Civil works (plinth, RCC floor, boundary) are typically in the client's scope. GST @ 18% and transport are extra. Get heat-load and electrical sizing finalised before ordering panels.

Frequently Asked Questions

PUF panel grow rooms Grow room sizes & pricing Design your project Production guide Mushroom farming equipment price list Mushroom farming machine prices PUF panel thickness for mushroom rooms Grow room tonnage (TR) calculation MS growing rack design standards

The company behind the build

Why Choose MushroomWale

01
Engineering Expertise
Agrimotion Engineering Private Limited is a registered EPC company (CIN U43900UP2023PTC185328, GSTIN 09AAZCA0158R1ZP) based in Firozabad, Uttar Pradesh.
02
Proven Track Record
Turnkey mushroom projects from a 2-room starter to a 20-room commercial farm.
03
Bank-Recognized DPRs
Bank-format DPRs prepared to NABARD, NHB and MIDH norms for loan and subsidy applications.

A MushroomWale grow room in crop, bags on every tier

Start your project

Building a mushroom farm? Get the structure right the first time

MushroomWale delivers turnkey grow rooms with PPGL PUF panels, galvanised structure, sized refrigeration and biosecure airlocks — engineered for 18–22 kg/m² yields across 5–6 cycles a year.

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