A high tunnel typically costs $3,000-$45,000, with many growers spending about $15,000 for a professionally installed mid-size structure. High tunnel cost depends most on dimensions, steel frame strength, plastic-cover options, site preparation, and whether the buyer assembles the kit or hires a crew.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 20-by-48-foot kit | $3,000 | $5,500 | $9,000 | Materials, basic ventilation; assembly not included |
| 30-by-96-foot project | $10,000 | $20,000 | $35,000 | Kit plus typical professional installation |
| Installed price per square foot | $4 | $8 | $15 | Varies with options, access, and regional labor |
High Tunnel Cost by Size and Cover Type
A basic 20-by-48-foot kit can run $3,000-$9,000, or roughly $3-$9 per square foot, before hired labor. A 30-by-96-foot structure often costs $8,000-$18,000 for the kit and $15,000-$35,000 installed. Larger commercial tunnels may exceed $45,000 when engineered frames, automated ventilation, or extensive site work are included.
For a straightforward, unheated tunnel, budgeting $5-$12 per square foot installed is a useful starting point. That range assumes standard galvanized steel, greenhouse film, ordinary soil conditions, and no major utility work. A second layer of plastic, stronger bows, or roll-up sides can raise the quote.
Assumptions: U.S. pricing for common galvanized-steel kits, standard greenhouse film, and normal site access; regional quotes vary.
What Steel, Plastic, and Assembly Add to the Quote
The following estimates compare common project sizes. Material and labor amounts vary by supplier and crew; equipment and delivery may be bundled into a quote rather than itemized.
| Project | Materials | Labor | Equipment | Delivery/Disposal | Total |
|---|---|---|---|---|---|
| 20 by 48 feet | $3,000-$7,000 | $0-$5,000 | $0-$1,000 | $200-$800 | $3,200-$13,800 |
| 30 by 96 feet | $8,000-$18,000 | $4,000-$12,000 | $500-$2,000 | $500-$1,500 | $13,000-$33,500 |
Greenhouse film is a major replacement item, while end-wall framing, doors, ground posts, and ventilation hardware affect the initial bill. Freight can be meaningful for long steel bows or a remote delivery point. Ask whether the quote includes film, anchors, end walls, freight, and assembly before comparing totals.
How Width, Length, and Steel Gauge Change the Price
Length increases the number of bows, purlins, and cover material, so a 96-foot tunnel usually costs more than a 48-foot model of the same width. A 30-foot-wide tunnel also needs more material and may need a stronger frame than a 20-foot design. The quoted bow spacing matters: 4-foot spacing uses more frame steel than 6-foot spacing but can improve support in demanding conditions.
Snow and wind exposure can change the required frame specification. In areas with regular heavy snow or strong winds, reinforced bows, closer spacing, and stronger anchors may add roughly 10%-30% over a basic frame. Confirm the manufacturer’s design limits and local requirements instead of choosing a light-duty kit based only on its advertised price.
Check the frame rating against local wind and snow conditions, especially for widths of 30 feet or more. Moving up to thicker-gauge steel or more frequent bows may cost less than repairing a collapsed structure.
Does Professional Assembly Cost More Than a Kit?
Professional assembly commonly adds $2-$6 per square foot, depending on crew size, frame design, and site access. A crew may spend 2-4 days on a 20-by-48-foot tunnel and 4-8 days on a 30-by-96-foot structure, including framing and covering.
For a rough labor estimate, a three-person crew working 24-40 hours at $45-$85 per worker-hour could charge about $3,200-$10,200, before travel or difficult ground conditions. Local contractors may quote a fixed project price instead. Compare the installed quote with the kit price only after confirming that both include the same anchors, doors, and film installation.
Regional High Tunnel Prices Across the U.S.
Labor and delivery can shift project totals even when the kit is identical. A practical planning adjustment is about 10%-20% above a typical quote in high-cost metro areas and remote locations. Rural regions near greenhouse suppliers may come in 5%-15% below a broad national estimate, although freight can erase that advantage.
Weather also affects regional specifications. Colder or windier locations may require a stronger frame, more anchors, or snow-management features, while mild regions may use a simpler design. Use regional percentages as a planning allowance, not a substitute for local bids and site-specific engineering.
Site Preparation, End Walls, and Ventilation Add-Ons
Leveling and clearing a site can add $500-$3,000 for light work, and more if grading, drainage, or access improvements are needed. A gravel perimeter or drainage work may add another $500-$2,500. End-wall doors and framing often add $500-$2,000, while roll-up sides or manual ventilation systems can add $500-$2,500. Motorized ventilation, controls, or a second film layer may push the add-on bill higher.
Electrical service, irrigation, and interior benches are often priced separately. A simple irrigation setup may cost $300-$1,500, while bringing power to a remote site can cost several thousand dollars. Separate the tunnel shell from farm utilities and interior equipment when setting the project budget.
Where Growers Can Trim a High Tunnel Budget
Choose dimensions around actual bed layout and equipment access rather than buying excess growing space. A standard kit size may cost less than a custom length, and manual roll-up sides can avoid the initial expense of motors and controls. Buyers who have suitable tools and construction experience may save the installation charge, but should account for crew help, equipment rental, and time.
Compare at least three written quotes with matching dimensions, steel specifications, bow spacing, plastic thickness, anchor type, freight, and warranty. Ask whether a local supplier can combine delivery with other orders, and schedule outside peak spring demand when contractors have more availability. Avoid cutting costs on frame ratings or anchoring where wind and snow exposure are significant.
The strongest savings usually come from controlling size and optional equipment while keeping the frame appropriate for local conditions. A lower kit price may not be a lower project price if it excludes delivery, end-wall materials, or installation.