80x150 Steel Office Building

This page is ordered around the enclosed space that supports the open floor, because focus and call rooms are what make open desking usable and are the first thing cut.

The footprint holds 60 front-of-house zones — 6 across by 10 deep — and the remaining 2 feet is marginal: there is no reception depth, so visitors arrive directly into the work floor and every arrival interrupts it.

Read this footprint through its span. 80 feet across is the fixed constraint; 150 feet of length is the negotiable one, and at 1.88 to 1 the building is long for its width, so movement runs front to back. Snow, wind and site exposure change what this shape costs to build long before the interior plan does.

A 80 by 150 footprint is a clearly directional plan: 12,000 sq ft enclosed by 460 ft of wall, at a 1.9:1 length-to-width proportion. Along its 150 ft dimension it takes 10 runs of front-of-house zones at 14 ft, leaving 10 ft over — the 10 ft is where the argument about this size actually happens. Taken purely as arithmetic, 80 by 150 gives 6 front-of-house zones across the 80 ft dimension once 8 ft is reserved for movement, and 10 deep along the 150 ft dimension. Run as a an office visitors come to, planned around arrival and meeting, 0 ft across is below the 8 ft this use needs to be worth planning, so there is no reception depth, so visitors arrive directly into the work floor and every arrival interrupts it Heating and cooling zoning follows occupancy patterns rather than the floor plate.

At 80x150 the operating question is a specific one: where does a visitor stand in the first thirty seconds after opening the door? That is a different question from the one a steel office building of another shape has to answer, and it is why this footprint is planned as an office visitors come to, planned around arrival and meeting rather than as generic covered area.

The work pattern this floor could equally be planned around is office space attached to a working or storage area in one building: there is no transition zone, so the working side's dirt, noise and traffic arrive in the office through a single door. Dividing the 12,000 sq ft by the 12 by 14 ft front-of-house zone gives roughly 60 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 60 or drops to 50 comes back to the question this footprint is really answering: where does a visitor stand in the first thirty seconds after opening the door?

The 2-foot leftover depth falls under the 8 feet this platform treats as usable for a steel office building, so there is no reception depth, so visitors arrive directly into the work floor and every arrival interrupts it. Fire separation, egress and occupancy are determined for the specific building and can reshape this plan entirely.

Spare width is the more valuable of the two leftovers here: a continuous 8-foot strip beats the same area stranded at the end of the run, because it touches every position along the way. The mezzanine that is added afterwards is the change order that reprices the frame.

Compared with a 80 by 110 of the same width, the extra depth here adds run rather than reach: it buys about 10 front-of-house zones in line, and every position past the second is retrieved by moving what stands in front of it. Spent as a square 110 by 110 instead, the same 12,000 sq ft would stand 8 front-of-house zones across rather than 6, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. A building of this size behaves like a small yard under a roof: zones need to be defined, signed and left alone, or they migrate. Two populations use the building — staff continuously and visitors briefly — and keeping their routes apart is the whole layout discipline. Occupant load, egress and accessibility are determined for the specific project by the design professional and the authority having jurisdiction. That movement pattern, not the 12,000-square-foot total, is what decides whether the leftover 2 feet is useful here.

Nominal bay division computes to 6 bays at about 25 feet, wider than the 12-foot module — so a position can sit inside a bay without a frame line splitting it. Storage expands until it meets a wall, so give it a wall on purpose.

Two-plus rows change the access question entirely. Every rear position at 80x150 needs either its own opening or an aisle, and 8 feet of spare width is what that aisle has to come from. Judge the plan by what has to happen on the worst day of the year, not on an average one.

The working floor grows behind; the front of house rarely changes once it is set.

Configured as an office visitors come to, planned around arrival and meeting, 80x150 is judged on whether the 60 front-of-house zones it holds match the operation, and on whether the 8 feet of spare width leaves the route this mode depends on.

• Does the work need racking or work zones on both sides with a full vehicle lane down the middle, or does it need a second lane that this 80-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 finished ceiling height do you want, and what service zone sits above it?
• Where does the service core go, and does the desk plan work around it?

Across a 80-foot span the 4:12 pitch adds 13.3 feet between eave and ridge. The centreline measures 37.3 feet; anything parked or stacked near a wall lives with the 24-foot eave. Rows that cannot be entered independently end up used as one long space.

Height on a 80 ft span is a separate decision from the 150 ft length, and it is the span that sets the frame's behavior. Raising the eave over 12,000 sq ft affects every bay along the 150 ft dimension, so the test is whether client facing office layout genuinely needs the extra clear height or only the floor area.

Ventilation across 12,000 square feet at this height: continuous occupancy at desk density makes air handling a core system rather than an accessory.

The 80-foot gable can carry 6 openings, one per front-of-house zone, with 8 feet of wall left for piers between and beside them — the arrangement that keeps each position independently reachable. Circulation width is the first thing surrendered under pressure and the first thing missed afterwards.

A legible main entrance and, where the plan allows, a staff entrance so arriving staff do not pass through reception.

Quantities, not prices, are publishable here: roof cladding runs 12,649 square feet — 5% above the 12,000-square-foot floor at a 4:12 pitch — with 222.2 cubic yards of nominal slab beneath it. Two feet of spare width reads as nothing on a plan and as a great deal when a machine is being turned.

Front-of-house finishes, meeting-room acoustics and the accessible restroom carry disproportionate cost relative to their area.

• interior partitions, ceilings and finishes across the whole floor
• the service core with restrooms and kitchen
• air handling for continuous occupancy
• small-power and data distribution density

• 60x80 moves the count from 60 to 16 front-of-house zones (4 across by 4 deep), which is the reason to choose between them.
• 40x120 moves the count from 60 to 21 front-of-house zones (3 across by 7 deep), which is the reason to choose between them.
• 50x100 moves the count from 60 to 28 front-of-house zones (4 across by 7 deep), which is the reason to choose between them.

Because this footprint is planned as an office visitors come to, planned around arrival and meeting, the useful next reads are different from the ones a differently shaped steel office building suggests: client facing office layout, reception and waiting, visitor route separation.