How to Prepare a Greenhouse Project RFQ Before Choosing Suppliers or Equipment

Why a greenhouse is more than a structure

The visible part of a greenhouse project — steel, gutters, covering, screens, fans — is the consequence of decisions taken elsewhere. Crop choice sets working height, light requirement, trellis loads and humidity behaviour. Water quality sets filtration, treatment and the entire fertigation recipe. Local climate sets cooling, heating, shading and dehumidification capacity, and those choices then set the energy demand that carries the operating cost for the life of the facility.

Labour availability and training capacity decide how much automation is genuinely useful. Market access, packaging, cold chain and transport decide what the harvest is worth after it leaves the site. Farm-management and monitoring requirements decide what data the control system must produce. Change any one of these inputs and the greenhouse design, the operating cost model and the production assumptions can all move materially.

This is why supplier comparison based only on price per square metre is unreliable. Two offers can differ in steel grade, wind and snow loading, ventilation area, screen layers, irrigation uniformity, dosing channels, control platform, installation, commissioning, training and spare parts — or simply in what has quietly been excluded. A structured RFQ makes those differences visible before any commercial discussion begins.

What affects greenhouse project cost and operating cost

Capital cost is driven by area and phasing, greenhouse type and covering, structural design loads, ventilation and screening, cooling and heating capacity, irrigation and fertigation scope, water treatment and storage, energy infrastructure and backup, automation depth, civil works, and post-harvest and packing facilities.

Operating cost is driven by energy, water, labour, nutrients and crop protection, substrate and planting material, maintenance and spare parts, packaging and logistics, and the cost of any performance shortfall in climate or irrigation. A design that saves capital by undersizing cooling or dosing often transfers the saving into permanent operating cost and yield risk.

Equipment and climate control in a modern greenhouse

A modern smart greenhouse combines a structure with an environmental system: natural or forced ventilation, evaporative or mechanical cooling, heating, energy and shade screens, dehumidification where humidity limits the crop, CO₂ where the crop justifies it, and a control platform reading temperature, humidity, radiation, wind, rain, and root-zone or substrate sensors.

Irrigation and fertigation belong to the same system. A fertigation head station handles filtration, dosing of nutrient stocks, acid injection for alkalinity correction, EC and pH control, and drain measurement where recirculation is planned. Climate control drives transpiration, transpiration drives irrigation, and irrigation strategy drives root-zone conditions that change the climate strategy again. Specify them together, not as three unrelated purchases.

Automation should follow operating capability. Sensors, alarms, remote monitoring and recipe-based control are valuable when trained operators, service response and spare parts exist. Where they do not yet exist, training, redundancy and simplicity are worth more than additional features.

Hydroponic, substrate or soil growing

Soil-based growing keeps capital cost lower and relies on soil analysis, drainage and rotation discipline. Substrate and hydroponic systems separate the crop from the soil, give tighter control of water and nutrition, and generally require better water quality, more reliable power, disinfection where drain water is recirculated, and a higher standard of daily operational management.

The right method depends on the crop, water quality, climate, capital available and the team that will run the facility. The RFQ should state the intended method, and also state honestly where that decision is still open, so offers can be compared on the same basis.

Practical greenhouse RFQ checklist

Complete what you know and mark the rest as open. A short, honest RFQ is more useful than a long, speculative one.

• Crop type and target market
• Greenhouse area and production targets
• Growing method: soil, hydroponic, substrate or other
• Site location, altitude and climate
• Temperature, humidity, wind and solar conditions
• Water source, quality and availability
• Irrigation, fertigation and filtration requirements
• Heating, cooling, shading and ventilation needs
• Energy supply and backup systems
• Automation, sensors and climate-control requirements
• Seedlings, crop cycle and harvest schedule
• Packaging, storage and logistics requirements
• Labour, training and operational support
• Local regulations, permits and food-safety requirements
• Budget range, delivery location and timeline
• Financing-pathway needs, if relevant

Calculator and estimate discipline

Calculators are useful for early scoping. They help compare orders of magnitude, test phasing and prepare a conversation. They do not replace agronomic validation, irrigation design, engineering assessment, site review, supplier quotation or regulatory approval.

Any estimate should preserve its inputs, units, dates, assumptions, outputs and limitations, so that a reviewer can see exactly how a number was produced. Human approval is required before an estimate becomes a technical or commercial commitment.

How the process works

The workflow is deliberately sequential, so that nothing leaves the desk before it has been read by a person.

1. 1WhatsApp conversation — describe the project in your own words, 24/7.
2. 2Project brief — the requirement is organised into a structured brief.
3. 3Missing-information checklist — open points are listed with an owner.
4. 4Structured RFQ — one comparable scope is prepared.
5. 5Human review — David and the team read the project.
6. 6Appropriate supplier or technical routing — only after that review.

Hard stop before outreach

The workflow pauses, without exception, before any of the following:

• Contacting suppliers
• Selecting a greenhouse design
• Promising crop yield
• Presenting a final price
• Guaranteeing water, energy or climate performance
• Approving financing
• Sharing sensitive company information
• Creating a buyer-supplier introduction

Location-intent examples

The same crop and the same greenhouse area produce very different requirements in different places. These examples show the type of question worth raising early, not a claim about any market.

UAE

Summer cooling capacity, humidity management and water efficiency usually dominate early scoping questions.

Saudi Arabia

Site climate extremes, water source strategy and energy planning shape the climate-control scope.

Morocco

Export-oriented crop calendars raise questions about packaging, cold chain and harvest scheduling.

Egypt

Irrigation water quality, filtration and fertigation design are common first technical topics.

Jordan

Water efficiency, storage and drain-water strategy are usually reviewed before structure selection.

Oman

Coastal humidity, cooling method and corrosion-aware specification are typical early questions.

Cyprus

Seasonal temperature range and ventilation strategy often drive the climate specification.

Greece

Crop calendar, heating for winter production and energy planning are frequent starting points.

Italy

Modernization of existing greenhouses, automation retrofits and energy use are common project types.

Spain

Technology level, water use and market-driven quality requirements are usually discussed together.

Portugal

Crop suitability, irrigation design and post-harvest logistics tend to be scoped in parallel.

Africa and emerging food-security markets

Power reliability, service availability, training and spare-part strategy are decisive scoping questions.

No local supplier availability, water availability, energy price, permit, crop yield, regulation or financing outcome is claimed here. Climate, water, energy, logistics, labour, regulation and project feasibility must be reviewed individually for every site.

Who this guide is for

The guide is written for the people who own project scope and budget rather than for hobby growing.

• Commercial growers
• Greenhouse and protected-agriculture operators
• Fresh-produce companies
• Agricultural investors
• Food-security projects
• Procurement and project managers
• Irrigation and agricultural-development teams
• Government and institutional agriculture projects

What you can start with through WhatsApp

The 24/7 WhatsApp project intake is a normal working conversation. It is useful for early questions as well as for structured requirements.

• Commercial greenhouses
• Hydroponic systems
• Vertical and controlled environment agriculture
• Irrigation and fertigation
• Climate control
• Heating, cooling and ventilation
• Crop selection and growing systems
• Water treatment and water efficiency
• Automation, sensors and monitoring
• Expansion or modernization of existing greenhouses

Frequently asked questions