50x150 Steel Office Building

No price appears on this page. The quantities that scale an estimate at 50x150 are 7,500 square feet of slab, 92.6 cubic yards of nominal concrete, 5,600 square feet of wall cladding and 7,731 square feet of roof cladding. Security and after-hours access are easier to design in the door layout than to bolt on later.

Proportion drives cost here as much as size does: 400 ft of wall around 7,500 sq ft is 0.053 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 office space attached to a working or storage area in one building is the fit-out office and operations building implies, along with framed openings and the height chosen for the 50 ft span.

• 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

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 27 office zones — 3 across by 9 deep — and the remaining 6 feet is marginal: there is no transition zone, so the working side's dirt, noise and traffic arrive in the office through a single door.

Read this footprint through its span. 50 feet across is the fixed constraint; 150 feet of length is the negotiable one, and at 3 to 1 the building is long for its width, so movement runs front to back. Judge the plan by what has to happen on the worst day of the year, not on an average one.

A 50 by 150 footprint is a long corridor of a plan: 7,500 sq ft enclosed by 400 ft of wall, at a 3:1 length-to-width proportion. Along its 150 ft dimension it takes 10 runs of office zones at 15 ft, leaving 0 ft over — the 0 ft is where the argument about this size actually happens. A combined building saves a second structure and creates one interface, and that interface is the plan. Noise, dust and traffic move one way through it; supervision and paperwork move the other, and the transition zone is what lets both happen. Occupant load, egress and accessibility are determined for the specific project by the design professional and the authority having jurisdiction.

This footprint is planned as office space attached to a working or storage area in one building. Compared with a 50 by 110 of the same width, the extra depth here adds run rather than reach: it buys about 10 office zones in line, and every position past the second is retrieved by moving what stands in front of it. Spent as a square 87 by 87 instead, the same 7,500 sq ft would stand 6 office zones 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. At this size the building becomes a shared resource, and shared resources need a written rule for who parks where and which door is kept clear. The two sides run different hours, temperatures and noise levels. Services, heating and access are usually planned separately even though the roof is shared. Data and power distribution are cheaper installed with the fit-out than added to it.

The work pattern this floor could equally be planned around is an office of individual rooms, planned around privacy and corridors: there is no support core, so shared functions sit in the corridor and every use of them is heard through two doors. Dividing the 7,500 sq ft by the 13 by 15 ft office zone gives roughly 30 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 30 or drops to 20 comes back to the question this footprint is really answering: what happens in the doorway between the quiet side and the working side?

Treating the last 6 feet as a room is the recurring planning error at 50x150: there is no transition zone, so the working side's dirt, noise and traffic arrive in the office through a single door. Rows that cannot be entered independently end up used as one long space.

The 11 feet of spare width runs the whole 150-foot length — 1,650 square feet of wall strip. It earns its keep as shelving, staging or a walking route, not as another office zone. Circulation width is the first thing surrendered under pressure and the first thing missed afterwards.

Compared with a 50 by 110 of the same width, the extra depth here adds run rather than reach: it buys about 10 office zones in line, and every position past the second is retrieved by moving what stands in front of it. Spent as a square 87 by 87 instead, the same 7,500 sq ft would stand 6 office zones 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. At this size the building becomes a shared resource, and shared resources need a written rule for who parks where and which door is kept clear. The two sides run different hours, temperatures and noise levels. Services, heating and access are usually planned separately even though the roof is shared. Data and power distribution are cheaper installed with the fit-out than added to it. That movement pattern, not the 7,500-square-foot total, is what decides whether the leftover 6 feet is useful here.

At 25-foot nominal bays the structure works with the layout instead of against it: one office zone per bay line, walls free of awkward half-positions. Two feet of spare width reads as nothing on a plan and as a great deal when a machine is being turned.

Depth here creates a hierarchy: 9 rows means front positions get used and rear positions get filled. Deciding which is which up front is what keeps 50x150 workable. The plan is only as good as the route into it, which is a site question rather than a building one.

The operational side grows and the office rarely does, so the extension direction is decided at placement.

Configured as office space attached to a working or storage area in one building, 50x150 is judged on whether the 27 office zones it holds match the operation, and on whether the 11 feet of spare width leaves the route this mode depends on.

• Does the work need three lanes and a working lane, or two lanes with an interior work hall between them, or does it need a second lane that this 50-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 50-foot span the 3:12 pitch adds 6.3 feet between eave and ridge. The centreline measures 20.3 feet; anything parked or stacked near a wall lives with the 14-foot eave. Whoever operates the building daily should read the plan before it is frozen, because they know where the pinch points are.

The working side sets the height and the office side does not need it, which argues for a lower office volume rather than a uniform one.

Ventilation across 7,500 square feet at this height: continuous occupancy at desk density makes air handling a core system rather than an accessory.

One opening per position works on this gable: 3 across 50 feet, with 11 feet of wall to distribute as piers. Splitting that margin evenly is what keeps the elevation buildable. Daylight placement changes how a floor is used far more than its cost suggests.

The 50 ft ends and the 150 ft sides offer very different opening budgets: 50 ft of end wall has room for one wide opening or two modest ones, while 150 ft of side wall can carry several without the openings competing. On this plan the deciding factor is whether office and operations building or transition zone should be the first thing reached from the door.

• 30x100 moves the count from 27 to 12 office zones (2 across by 6 deep), which is the reason to choose between them.
• 50x60 moves the count from 27 to 9 office zones (3 across by 3 deep), which is the reason to choose between them.
• 40x80 moves the count from 27 to 8 office zones (2 across by 4 deep), which is the reason to choose between them.

Because this footprint is planned as office space attached to a working or storage area in one building, the useful next reads are different from the ones a differently shaped steel office building suggests: office and operations building, transition zone, separate entrances.