250 ft clear span
At 250 feet the governing question stops being whether the frame is strong enough and becomes how far it moves. Steel goes in to control deflection no strength check demands, and the number of manufacturers who will quote it at all drops sharply.
Priced as a 250 × 300 ft building at a 36 ft eave, 25 ft bays, 20 psf ground snow on the ASCE 7-16 basis, 115 mph wind, no crane — a case that matches what actually gets built at this width. Change any of it in the calculator.
Framing steel
16.10 – 22.54 lb/sf
Primary and secondary, 604 – 845 tons total
Building package
$32.44 – $44.02/sf
$2.43M – $3.30M over 75,000 sf
Installed
$50.27 – $83.64/sf
$3.77M – $6.27M, before interior buildout
Modular would save
28%
About $803K on the package
Outside the usual range. This width prices outside the $14–22/sf band commonly quoted for metal building packages. That band describes ordinary spans; a 250 ft clear span legitimately leaves it, and clamping the figure to look tidy would make it useless exactly where it is most needed. How these figures were derived.
At this span: Specialist territory. Justified by use, not economics - hangars, arenas, column-free process floors.
The short answer
Get more than one manufacturer, and get the deflection criteria into the specification before anyone prices it. Two bids to two different deflection limits are not comparable.
Planning-stage estimate calibrated to published industry ranges. Not a substitute for a stamped design by a licensed engineer.
Geometry that follows from the width alone, at this page's 36 ft eave. These are planning rules, stated so they can be argued with — the derivations are on the methodology page.
| Dimension | At 250 ft | Why it matters |
|---|---|---|
| Frame depth at the haunch | 120–150 in | Span/25 to span/20. The deepest point of the frame, at the knee, where the moment peaks. |
| Clear height at the sidewall | 23.5–26 ft | Eave height minus the haunch. The height you can actually use in the first bay in from the wall; clearance rises toward the ridge. |
| Rafter half length | 125 ft | Haunch to ridge. What has to get on a truck. |
| Shipping pieces per half | 3 | Past ordinary haul length, so the half arrives in bolted segments and each splice is a connection to make up in the field. |
| Deflection allowance, L/240 | 12.5 in | Allowable midspan movement with a non-plaster ceiling, per IBC Table 1604.3. The weight model behind this page checks none of it. |
| Engineering | Custom | Past the 150 ft ceiling for a standard frame. Project-specific engineering, fewer bidders, longer lead time. |
An L/240 limit at 250 ft allows 12.5 in of vertical movement at midspan; L/180 allows 16.7 in. Those are large absolute numbers, and holding them takes stiffness rather than strength — a deeper section, more flange material, a frame heavier than the one that would simply not fail.
That matters commercially because deflection criteria are a specification choice, not a code constant. IBC sets limits by roof type and by what hangs below. A frame designed to L/180 with no ceiling is materially lighter, and cheaper, than the same frame designed to L/240 with a suspended ceiling under it. If your bid documents do not say which, you will get both back, and it will look like a price difference when it is a specification difference.
It also means the estimate on this page understates the building. The weight model behind these figures checks no deflection at all — that is stated plainly in the methodology — and long spans are exactly where the omission costs most.
Plenty of manufacturers list 250 ft as within their capability. Rather fewer will produce a keen price for it in a given week, because it occupies shop capacity, needs project-specific engineering, and carries erection risk they may be asked to stand behind. The practical effect is less competitive tension exactly where the money is largest.
Give yourself time and bid it widely. Lead times at this width are driven by engineering and shop scheduling rather than mill availability, and a rushed programme removes what little competitive pressure there is.
Framing runs about 16.10 – 22.54 lb/sf, four times the weight per square foot of a 60 ft frame. The haunch is 120–150 in deep and clear height at the sidewall is 23.5–26 ft under a 36 ft eave. Rafter halves are 125 ft, about 3 shipping pieces each.
The modular saving is 28%, roughly $803K on this building. At this width almost the only remaining justifications for a clear floor are aircraft and very large column-free process or storage areas — which is precisely the list of applications that survives here.
The uses whose typical width covers 250 ft, and what drives the geometry in each. A use that does not appear here is not impossible at this width — it is just not where it usually lands.
| Use | Typical width | Typical eave | What sets the geometry |
|---|---|---|---|
| Aircraft Hangar | 100–300 ft | 24–60 ft | Door opening and tail height, not floor area. The clear span is set by the widest aircraft plus wingtip clearance. Usually clear span. |
| Warehouse / Distribution | 100–400 ft | 28–40 ft | Rack grid and dock count. A column is free if it lands on a rack line, so modular almost always wins. Usually modular. |
A modular frame at this width comes in around 28% lower on the building package — roughly $803K on the 75,000 sf building priced above. At that level clear span has stopped being an economic option and become a purchase: you should be able to name what the column-free floor is for.
The frame selector's own recommendation for this case, with interior columns permitted, is a Modular frame with tapered columns. Web-tapered members follow the moment diagram and are the lightest way to carry this span.
Next step
A dealer quoting your actual geometry and load case beats any estimator, including this one. Three of them, each carrying engineer-stamped drawings for your state, cost you nothing to ask.