Post-frame shops get shopped on a published $45 a square foot or $28,000 for a 30×40 Facebook special. Those numbers cannot see the eave or the floor. A 10-foot ag shell on gravel with two walk doors is a different job from a 16-foot shop with two overhead doors, a lean-to, a 6-inch slab, and a shop panel.
Open the free pole barn bid calculatorA pole barn is posts and trusses on a spacing, then wall and roof steel. Divide the eave length by the post spacing and round up. A 40-foot building on 8-foot centers is five bays, fourteen posts, and six trusses. Each foot of eave above the included 10-foot coupon adds about 8 percent to frame and wall-steel hours — longer posts, more sheet, and more ladder time. A 16-foot shop is not a 10-foot barn with taller walls sketched on.
Gravel is a spread. A 4-inch slab is ready-mix, rebar, and a crew day. A 6-inch reinforced slab is more yards and more steel. Matching a gravel per-foot special on a shop slab is how a sold barn becomes a two-week loss after the first concrete ticket.
Walk doors are a half-hour each. An overhead door is a framed opening plus the door. A lean-to is extra posts, extra roof, and extra floor. Insulation and a 100-amp shop panel are their own tickets. The calculator prices the same barn three ways — gravel, 4-inch slab, 6-inch reinforced — so you can see which floor still keeps the margin when the owner asks you to “just match the other guy.”
Load the wage with payroll burden. Add overhead as a share of direct cost. Then take margin as a share of the customer’s price, not a markup on cost. The walk-away number is total cost. A proposed price under that number loses money before you take anything out of it.
This page is a walkthrough of the arithmetic in the pole barn bid calculator. It is not a structural specification, an engineered stamp, or a price you should copy onto a contract.
Charge from bay count, eave height, doors, lean-to, and the floor — not a published per-square-foot special. A 30×40×10 ag shell on gravel with two walk doors is a different job from a 40×60×16 shop with two overhead doors, a lean-to, and a 6-inch slab.
Divide the eave length by the post spacing and round up to get bays. Posts sit at both ends of every bay on both eaves, plus two extra gable posts that are not the shared corners. A 40-foot building on 8-foot centers is 5 bays, 12 eave posts, and 2 gable posts.
Yes. Each foot above the included 10-foot coupon adds about 8 percent to frame and wall-steel hours — longer posts, more sheet, and more ladder time. A 16-foot shop is not a 10-foot ag barn with taller walls sketched on.
Gravel is a spread. A 4-inch slab is ready-mix, rebar, and a crew day. A 6-inch reinforced slab is more yards and more steel. Matching a gravel per-foot special on a shop slab is how a sold barn becomes a two-week loss after the first concrete ticket.