Start by defining what the quotation includes
Two proposals can both say “1,000 sq ft greenhouse” and still describe completely different projects. One may include only the steel frame and film. Another may include foundations, cooling, irrigation, controls, installation and commissioning. The lower headline price is not automatically the lower project cost.
| Cost group | What should be specified | Why it changes the budget |
|---|---|---|
| Structure | Width, bay spacing, gutter height, steel grade, coating and design loads | More steel, taller houses and higher wind or snow loads affect material and foundation requirements. |
| Covering | Single or double film, polycarbonate, glass, insect screen and shading | Covering affects light, insulation, service life and the supporting structure. |
| Foundation and drainage | Anchors, concrete, grading, gutters and runoff route | Site conditions and local engineering can be a larger cost than buyers expect. |
| Climate systems | Roof and side vents, fans, pad cooling, heating, circulation and screens | The required capacity depends on outdoor design conditions and crop targets. |
| Crop systems | Irrigation, fertigation, tanks, filters, benches, gutters or substrate | A bare structure is not yet a crop-ready production system. |
| Controls and electrical | Sensors, controller, motors, panels, cabling and backup strategy | Automation level and local electrical standards affect both equipment and labor. |
| Logistics and installation | Incoterm, packing, inland transport, sea freight, customs, crew and equipment | A factory price and an installed site price are not comparable totals. |
Three common scope levels
1. Structure package
This usually covers the frame, selected covering and basic openings. It may suit a buyer who already has local contractors and crop systems. Confirm whether anchors, gutters, doors, fasteners, drawings and spare covering material are included.
2. Crop-ready greenhouse
This adds the equipment needed for the planned crop, such as ventilation, irrigation, filtration, fertigation and crop-support hardware. A crop-ready scope should state design capacities, not just equipment names.
3. Controlled-production facility
This may add active cooling or heating, environmental controls, screens, sensors, electrical panels and commissioning. For a commercial buyer, the design question is whether these systems can maintain the required conditions during local design weather, not whether the brochure calls the greenhouse “smart.”
How to compare greenhouse quotations fairly
Build a comparison sheet with one row for every required component. Record the quantity, material specification, capacity, warranty, delivery term and exclusions. Then calculate both the equipment price per square metre and the estimated installed project total. A price per square foot is useful only after the scopes have been normalized.
Look closely at low bids. Common gaps include unspecified structural loads, no site drainage, undersized ventilation, manual equipment where motors were expected, missing electrical panels, no installation supervision and no commissioning. These gaps usually appear later as change orders or local purchases.
Check how much of 1,000 sq ft can actually grow crops
The quoted floor area is not the planted area. Draw the aisle, door swing, work space, internal tank or service positions and crop rows before using an area-based cost. Count any outside equipment area separately so it is not subtracted twice. A narrow access route may look efficient on paper but prevent a trolley, harvest crew or replacement component from passing.
For this project, begin with the stated 1,000 sq ft (about 92.9 m²), then subtract the non-overlapping aisle and service areas measured from the layout. Do not assume a standard percentage is usable.
If the same installed budget is divided by total floor area in one proposal and cropped area in another, the unit prices will appear different even without a cost difference. Keep both quantities visible. For benches or vertically arranged crops, describe productive area and level count separately; do not present added crop area as a larger building footprint.
Mississippi State Extension's greenhouse-business example distinguishes floor space from bench space and excludes land and site preparation from its construction example. Its historical Mississippi prices are not a current quotation for this project; the useful lesson is to state the area and exclusions.
Turn the layout into quantities a supplier can price
A small project still needs design and service connections. Do not divide the price of a much larger greenhouse by its area and assume that rate will apply to 1,000 sq ft. Some work follows area; other work follows the perimeter, connection distance, equipment capacity or a contractor's minimum mobilization scope. Ask the responsible party which basis applies.
| Item | Quantity basis to measure | Question that prevents a misleading rate |
|---|---|---|
| Ground cover or floor finish | Actual treated floor area, with overlaps and waste separately stated | Are aisles, service zones and edge details included? |
| Cladding and insect screen | Roof and wall surfaces or specified openings, not just floor area | Does the quote include ends, fixings, overlaps and replacement access? |
| Foundations and anchors | Engineer's support layout and foundation schedule | Which soil and wind/snow assumptions govern the quantity? |
| Water and electrical connections | Measured route from the available connection to the equipment | Who pays for trenching, capacity upgrades and local compliance? |
| Climate and irrigation equipment | Calculated duty and the required operating conditions | Will the equipment operate properly at this project's smaller demand? |
| Freight, installation and commissioning | Packing, access, crew scope, equipment visits and agreed tests | Which charges remain even when the building area is small? |
Put the quoted amount, required local work and unresolved items beside these quantities. Label an unknown amount "awaiting quotation," not zero. Keep crop-startup cash separate from the installed capital total. Alabama Extension's enterprise budgets likewise require growers to substitute values suited to their own operation rather than adopting the published projections unchanged.
Decide whether this is a pilot or a standalone business
A 1,000 sq ft unit can test a crop, production workflow or customer channel, but its size alone does not prove commercial viability. If it shares an existing farm's pump, packing room or staff, identify the capacity available and allocate those costs. If it must fund those services alone, include them in the business model. Shared equipment is not automatically spare capacity.
Before requesting the final quotation, finish one dimensioned crop-and-access layout, confirm the connection routes, and identify the buyer for the intended crop. Ask a crop adviser to review the production assumptions. A structure supplier can price an agreed equipment scope; it cannot establish your local selling price or confirm demand from floor area.
Information a supplier needs for an accurate budget
- Project country, city and exact site location
- Crop, growing method and intended production months
- Required growing area and available land dimensions
- Local maximum and minimum temperature, humidity and solar conditions
- Design wind speed, snow load and applicable building code
- Water source, water analysis, power supply and fuel availability
- Target temperature and humidity range
- Required systems and preferred automation level
- Delivery destination, desired Incoterm and installation responsibility
- Site photos, survey or a dimensioned plot plan
If these inputs are not available yet, begin with the commercial greenhouse project planning guide. You can also review CFGET's greenhouse structure categories and completed project examples before preparing the RFQ.
Questions buyers often ask
Is a film greenhouse always the cheapest option?
Film normally has a lower covering cost than polycarbonate or glass, but the complete project still depends on climate equipment, structure loads, foundation, service life and operating costs. Compare the whole system over the intended production period.
Can a supplier quote from floor area alone?
Only as a rough starting point. Floor area does not define the structural loads, internal environment, crop system or delivery scope. A firm commercial quotation needs project inputs and stated exclusions.
Should a small commercial project include automation?
Automation should solve a defined operating need. Motorized ventilation or irrigation control may reduce labor and improve consistency, but every added system should have a clear capacity, control logic and maintenance plan.
Request a scope-based quotation
Send your crop, site location, dimensions and climate requirements to info@cfgreenhouse.com, or use the CFGET contact page. We can identify the missing design inputs before preparing the equipment scope.