100x150 Clear-Span Steel Building

This page is ordered around the route animals take through the building, because a handling plan is judged on whether anything has to double back.

4 divisible bays fit across the 100-foot width with only 0 feet left over, which is a tight fit: the width is fully committed and nothing can be widened later without moving a wall.

Commitment first: 83% of the 15,000 square feet goes to divisible bays at 625 square feet each, and 1,300 square feet survives as edge strip. A footprint is worth its own decision when that split lands where the work does. The plan is only as good as the route into it, which is a site question rather than a building one.

A 100 by 150 footprint is a clearly directional plan: 15,000 sq ft enclosed by 500 ft of wall, at a 1.5:1 length-to-width proportion. Along its 150 ft dimension it takes 6 runs of divisible bays at 25 ft, leaving 0 ft over — the 0 ft is where the argument about this size actually happens. This mode treats the clear span as a blank the eventual occupant will divide, so the planning task is protecting future options rather than committing to one layout now. The building earns its value from how many different tenants or uses it could accommodate without structural rework, not from how well it fits any single one. The direction a building is expected to grow — lengthwise along a line or sequence, or widened for a parallel lane — should be decided at design time, because the two directions are rarely interchangeable later.

At 100x150 the operating question is a specific one: if this shell is split into two or three tenancies later, does each resulting bay still get its own door and utility access? That is a different question from the one a clear-span steel building of another shape has to answer, and it is why this footprint is planned as an unfinished clear-span shell planned for a tenant or use that has not yet been decided rather than as generic covered area.

Openings are the pinch point here. With 0 feet of spare width the gable cannot host 4 separate doors, so access is either shared or moved to the 150-foot sidewall. The building is fixed for decades while the operation inside it changes every few years, and the plan has to survive that.

Door placement is planned for whichever future division is most likely, generally one door per notional bay, so a later demising wall does not leave a bay without its own access.

At 25-foot nominal bays the structure works with the layout instead of against it: one divisible bay per bay line, walls free of awkward half-positions. Security and after-hours access are easier to design in the door layout than to bolt on later.

With 5 rows deep, the rear row is behind the front one. Without a route past it, those divisible bays become storage positions rather than working ones — the real cost of depth at this width. The span is the commitment; everything inside it is rearrangeable later, and the 100-foot dimension is not.

Growth here usually means finishing more of the existing shell for a new tenant rather than adding structure, since the clear span was already sized for the largest plausible single occupant.

Configured as an unfinished clear-span shell planned for a tenant or use that has not yet been decided, 100x150 is judged on whether the 20 divisible bays it holds match the operation, and on whether the 0 feet of spare width leaves the route this mode depends on.

• Does the work need an interior street with independent zones on both sides and turning room at each end, or does it need a second lane that this 100-foot span cannot give?
• Is the 150-foot length being bought for depth, or for the repeated bays — a long repeating bay sequence, so segment boundaries are set by bay lines rather than by walls?
• What dimension genuinely has to be crossed without a column?
• Is the clear height measured under the frame, or at the eave?

The use this column-free floor could equally be bought for is a clear-span floor whose value is uninterrupted stacking height and depth, not station count: there is no load-out lane, so reaching material at the back of the pile means moving material at the front first. Dividing the 15,000 sq ft by the 25 by 25 ft divisible bay gives roughly 18 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 18 or drops to 12 comes back to the question this footprint is really answering: if this shell is split into two or three tenancies later, does each resulting bay still get its own door and utility access?

The 13-foot leftover depth is 1,300 square feet across the full width — deep enough to plan deliberately, and at this footprint it goes to a demising line left unbuilt but planned for, so the shell can be split into separate leaseable bays without reworking the structure. Whoever operates the building daily should read the plan before it is frozen, because they know where the pinch points are.

Only 0 feet of width is spare, so there is no wall strip: anything set along a sidewall comes out of a divisible bay's clearance. Daylight placement changes how a floor is used far more than its cost suggests.

Spent as a square 122 by 122 instead, the same 15,000 sq ft would stand 4 divisible bays across rather than 3, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. Compared with a 100 by 110 of the same width, the extra depth here adds run rather than reach: it buys about 6 divisible bays in line, and every position past the second is retrieved by moving what stands in front of it. At this scale the building is infrastructure rather than a shed; scheduling, traffic direction and separation of activities matter more than any single dimension. The longest internal travel on a 100 by 150 plan is about 180 ft corner to corner, and the shortest useful one is the 100 ft cross-run. For a an unfinished clear-span shell planned for a tenant or use that has not yet been decided that matters where flexible shell building planning sits, because shortening the 100 ft run to serve it lengthens every trip along the 150 ft dimension. Overhead clearance, not eave height, is the number that matters when a crane, lifted load or tall equipment is involved, and it should be confirmed with the equipment supplier before the frame is ordered. That movement pattern, not the 15,000-square-foot total, is what decides whether the leftover 13 feet is useful here.

Span drives headroom at 100x150: 100 feet of width on a 4:12 pitch puts 40.7 feet over the middle and 24 feet at the walls, so where a tall item stands matters as much as how tall it is. Doors and their approaches decide more about daily use here than the enclosed area does.

A uniform clear height across the whole shell is worth more than a taller section in one area, because a taller pocket only benefits whichever future tenant happens to land on it.

The estimate at 100x150 moves with four computed quantities: 15,000 square feet of floor, 500 feet of perimeter, 12,000 square feet of wall and 15,811 square feet of roof. Everything else is site and specification. The floor treatment is a use decision that outlasts most of the equipment standing on it.

Proportion drives cost here as much as size does: 500 ft of wall around 15,000 sq ft is 0.033 ft of wall per enclosed square foot, and a squarer plan of the same area would carry less. What moves the figure further on a an unfinished clear-span shell planned for a tenant or use that has not yet been decided is the fit-out flexible shell building planning implies, along with framed openings and the height chosen for the 100 ft span.

• the span itself, which sets the primary frame
• clear height maintained under a deeper frame
• bracing strategy in the walls and roof
• opening positions the span makes possible

• 60x100 moves the count from 20 to 6 divisible bays (2 across by 3 deep), which is the reason to choose between them.
• 50x120 moves the count from 20 to 2 divisible bays (1 across by 2 deep), which is the reason to choose between them.
• 80x80 moves the count from 20 to 6 divisible bays (3 across by 2 deep), which is the reason to choose between them.

Because this footprint is planned as an unfinished clear-span shell planned for a tenant or use that has not yet been decided, the useful next reads are different from the ones a differently shaped clear-span steel building suggests: flexible shell building planning, demising line planning, multi-tenant clear-span shell.