This calculator vs. a flat installed price per square foot
“$X a square foot installed” is not a price for a shed — it is a price for one specific pad, delivery, access, and scope, quietly applied to every job that calls in.
What a flat installed price per square foot is
A flat rate per square foot is the fastest way to quote: multiply the shed's footprint by a number and read off a price. Homeowners shop it because it is easy to compare between bids, and it is the number a homeowner holding a competitor's flyer or a Facebook special will ask you to match.
The number behind it was set for one job — a factory-built drop-and-set onto an existing pad, a short forklift delivery, no ramp, no loft, no haul-away — and then reused for every shed afterward, whether or not the next job looks anything like the one the rate was built on.
What this calculator is
This page keeps no account and sends nothing to a server. You enter the shed's dimensions, fulfillment (factory-built drop-and-set, a kit assembled on site, or stick-built), pad (existing, new crushed-stone, or new concrete), access (forklift or crane), electrical, delivery miles, extra windows and doors, a ramp, a loft, and old-shed haul-away, plus your own labor hours and material costs. It prices the pad, the delivery, the access, and every extra separately by kind, then returns the walk-away price and a bid price above your target margin — for this job, not a generic one.
| What a flat installed price per square foot does | What this calculator does instead |
|---|---|
| Charges the same $/sq ft whether the shed is a factory-built drop-and-set, a kit assembled on site, or stick-built — even though a stick-built shed alone runs several times the build hours of a drop-and-set of the same footprint. | Prices build and set hours and material by fulfillment kit, so drop-and-set, kit, and stick-built are never quoted off the same number. |
| Has no line for the pad, regardless of whether the shed lands on an existing pad or needs a new crushed-stone or concrete pad poured. | Prices pad hours, cubic yards, and material by pad kind — existing, gravel, or slab — so a new pad costs more than a set onto what is already there. |
| Has no line for delivery miles or crane access, regardless of how far the job is or how tight the site. | Prices delivery hours and invoice by the mile, and access hours and equipment separately by forklift or crane, so a 40-mile crane set costs more than a 15-mile forklift drop. |
| Has no line for a ramp, a loft, extra windows or doors, or old-shed haul-away, regardless of how many the job needs. | Prices each extra separately -- ramp, loft, windows, doors, and haul-away -- so a fully loaded job costs more than a bare shell. |
| Gives the estimator a number to quote, not a number to check a quote against. | Reports the walk-away price and the dollar gap against what a flat rate would have quoted the same job, so a shopped price can be scored against real cost before you commit to it. |
Two sheds, the same footprint-blind rate
Using this calculator's own shipped presets, at its own shipped shop rates ($26/hr crew wage, 28% burden, 15% overhead, a 20% target margin):
| Job | This calculator's price | A flat $33.89/sq ft rate, applied by footprint alone | Gap |
|---|---|---|---|
| 10×12 (120 sq ft) factory-built drop-and-set, existing pad, 15 delivery miles, forklift — the job this flat rate was built on | $4,066.49 — $33.89/sq ft | $4,066.49 (same job, same rate) | No gap: this is the one job the flat rate fits. |
| 12×16 (192 sq ft) lofted kit, new gravel pad, 40 delivery miles, crane, ramp, haul-away | $8,682.28 bid price; $6,945.82 break-even cost | $6,506.39 | The flat rate quotes $439.44 below this job's own break-even cost — before a dollar of profit — and $2,175.89 below the calculator's own bid price. |
Both flat-rate quotes use the $33.89/sq ft rate the 10×12 drop-and-set job's own price works out to. Applied to the lofted kit's 192 sq ft, that rate does not just erode margin — it prices below the job's own cost to complete. Run your own shed's numbers in the calculator to see where it falls.
A flat rate is not wrong because it is simple — it is wrong when it is applied outside the one job it was built for, and nothing about a per-square-foot number tells you when that has happened. This calculator does not know your local market; it replaces the arithmetic a flat rate skips.
Common questions
Why does a flat installed price per square foot get a shed quote wrong?
Because the cost driver is the pad, the delivery, the access, and the extras, not floor area. A 12x16 lofted kit on a new gravel pad, delivered 40 miles with a crane set, a ramp, and old-shed haul-away is doing five jobs a 10x12 factory-built drop-and-set onto an existing pad, delivered 15 miles with a forklift, never touches -- none of which scale with square footage the way a per-square-foot rate assumes. A flat installed rate charges all of that the same as the cheap drop-and-set it was priced from.
What does a flat installed price per square foot usually leave out entirely?
The pad (existing, new gravel, or new concrete), delivery miles, crane versus forklift access, and extras like a ramp, a loft, extra windows or doors, and old-shed haul-away. A job on an existing pad with a short forklift delivery is doing far less than one needing a new gravel pad, a 40-mile crane set, and haul-away -- and a per-square-foot number has no line for any of it.
How big is the pricing gap in practice?
On this calculator's own shipped presets: a 10x12 (120 sq ft) factory-built drop-and-set onto an existing pad, 15 delivery miles, forklift access, prices at $4,066.49 -- $33.89 a square foot. Applying that same $33.89 rate to a 12x16 (192 sq ft) lofted kit on a new gravel pad with a 40-mile crane set, a ramp, and old-shed haul-away quotes $6,506.39 -- $439.44 below that job's own $6,945.82 break-even cost, before a dollar of profit, and $2,175.89 below the calculator's own bid price.
Is a flat installed price per square foot ever the right way to quote?
For a narrow band of near-identical jobs -- same fulfillment, same pad, similar delivery distance, no crane and no extras either time -- a flat rate can land close. The risk is applying it outside that band without noticing, because the rate does not know which job it was built on and neither does the estimator until the pad, delivery, access, and extras are actually spelled out.
Does this calculator know what materials or labor cost in my market?
No. It has no data on local material or labor rates. It takes the shed's dimensions, fulfillment, pad, access, electrical, delivery miles, and extras, plus the labor hours and material costs you enter, and turns that into a price for this job -- the arithmetic a flat rate skips, not a market survey.
Open the Shed Install Bid Calculator to price your own job, or read the pricing walkthrough.