30x36 Three-Car Metal Garage

This page is ordered around commute, because that is the decision this footprint settles first and every later choice follows from it.

The footprint holds 2 bench-and-tool bays — 2 across by 1 deep — and the remaining 7 feet is marginal: the bench has no permanent footprint, so it is folded away or covered every time the bay is needed for the vehicle.

Commitment first: 58% of the 1,080 square feet goes to bench-and-tool bays at 312 square feet each, and 354 square feet survives as edge strip. A footprint is worth its own decision when that split lands where the work does. Two operations of the same size can want opposite plans, so the arithmetic below is a starting point rather than a recommendation.

A 30 by 36 footprint is a mildly directional plan: 1,080 sq ft enclosed by 132 ft of wall, at a 1.2:1 length-to-width proportion. Along its 36 ft dimension it takes 1 run of bench-and-tool bays at 24 ft, leaving 12 ft over — the 12 ft is where the argument about this size actually happens. This mode differs from a garage that occasionally sees tool use: here the workshop is a permanent bay with its own address, and parking is arranged around it rather than the other way around. That distinction decides whether tools stay set up between projects or get packed away every time. Fueled equipment and paper, fabric or cardboard storage are best kept in separate zones within the same building.

This footprint is planned as a fixed workshop bay standing beside — not instead of — the parking. At 1.2:1 the plan is close enough to square that neither width nor depth is doing the arguing; what decides the layout here is where the openings go, because no proportion is forcing a direction on the floor. Spent as a square 33 by 33 instead, the same 1,080 sq ft would stand 2 bench-and-tool bays across rather than 1, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. At this scale the building is usually operated by one or two people who know where everything is, so the plan can be loose and the doors matter more than the divisions. The longest internal travel on a 30 by 36 plan is about 47 ft corner to corner, and the shortest useful one is the 30 ft cross-run. Anything placed to shorten the 30 ft run lengthens the 36 ft one, which is the trade this footprint keeps presenting. Whether a residential garage is attached or detached, and what separation from the dwelling that requires, is determined by the authority having jurisdiction for the specific lot.

The 30-foot gable can carry 2 openings, one per bench-and-tool bay, with 4 feet of wall left for piers between and beside them — the arrangement that keeps each position independently reachable. The corner nobody plans for is the one that fills first, which is an argument for planning it.

A person door directly into the workshop bay, separate from the vehicle door, lets tool use continue with the vehicle door closed against weather and noise.

At 18-foot nominal bays the structure works with the layout instead of against it: one bench-and-tool bay per bay line, walls free of awkward half-positions. Neighbouring buildings, setbacks and the approach road often decide the orientation before the plan does.

A single row means nothing is trapped: every position faces the opening directly, which is this footprint's advantage over a deeper building of the same width. The plan should survive the day the largest item the operation owns has to come inside.

Extension is cheapest along the 36 ft dimension, where each added bay repeats work already framed; widening past 30 ft is a different frame rather than a longer one. A 30 by 36 building that grows to 30 by 60 gains 2 runs of bench-and-tool bays instead of 1, which is the practical unit of growth here.

Configured as a fixed workshop bay standing beside — not instead of — the parking, 30x36 is judged on whether the 2 bench-and-tool bays it holds match the operation, and on whether the 4 feet of spare width leaves the route this mode depends on.

• Does the work need two parked lanes side by side, or one lane and a genuine workbench run, or does it need a second lane that this 30-foot span cannot give?
• Is the 36-foot length being bought for depth, or for the repeated bays — two or three divisions, enough grain to place a partition but not to dedicate a bay?
• Is the third bay parking, workshop or storage, and does the door schedule match that answer?
• Do the two daily bays still work if the end bay is permanently occupied?

The stored configuration carries a 14-foot eave and computes to 17.8 feet at the ridge on a 3:12 pitch — a 3.8-foot rise across 30 feet. Height is therefore not uniform, and the sidewall is the constraint. A leftover strip earns its place only when something is deliberately put in it; otherwise it is circulation with a nicer name.

Overhead space above the bench is used for tool storage and long stock, and ceiling-mounted dust or fume extraction is planned into this bay specifically, not into the building generally.

No price appears on this page. The quantities that scale an estimate at 30x36 are 1,080 square feet of slab, 13.3 cubic yards of nominal concrete, 1,848 square feet of wall cladding and 1,113 square feet of roof cladding. What the building holds in its busiest week is the honest brief; the rest of the year is slack.

Proportion drives cost here as much as size does: 132 ft of wall around 1,080 sq ft is 0.122 ft of wall per enclosed square foot, and a squarer plan of the same area would carry less. Framed openings, interior finish and the height chosen for the 30 ft span move the figure further than the footprint alone does.

• frontage width, which grows the gable wall and the apron together
• a mixed door schedule instead of repeated identical openings
• the taller opening and the wall height it implies for the whole end
• separate circuits and lighting for the working bay

The way the third bay could equally be committed is capacity held in reserve for a second household vehicle or a visiting one: the reserve bay has been annexed by storage, so a visiting or second vehicle waits on the driveway while the bay is emptied. The workshop bay's footprint is drawn first and fixed; the parking lane is fitted alongside it, which sometimes means the vehicle bay is narrower than it would be in a parking-only building.

The 7-foot leftover depth falls under the 8 feet this platform treats as usable for a 3 car metal garage, so the bench has no permanent footprint, so it is folded away or covered every time the bay is needed for the vehicle. An empty building looks generous and a working one rarely does; plan against the working state.

The 4 feet of spare width runs the whole 36-foot length — 144 square feet of wall strip. It earns its keep as shelving, staging or a walking route, not as another bench-and-tool bay. Ground conditions and drainage decide the floor before the frame does.

At 1.2:1 the plan is close enough to square that neither width nor depth is doing the arguing; what decides the layout here is where the openings go, because no proportion is forcing a direction on the floor. Spent as a square 33 by 33 instead, the same 1,080 sq ft would stand 2 bench-and-tool bays across rather than 1, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. At this scale the building is usually operated by one or two people who know where everything is, so the plan can be loose and the doors matter more than the divisions. The longest internal travel on a 30 by 36 plan is about 47 ft corner to corner, and the shortest useful one is the 30 ft cross-run. Anything placed to shorten the 30 ft run lengthens the 36 ft one, which is the trade this footprint keeps presenting. Whether a residential garage is attached or detached, and what separation from the dwelling that requires, is determined by the authority having jurisdiction for the specific lot. That movement pattern, not the 1,080-square-foot total, is what decides whether the leftover 7 feet is useful here.

• 10x10 moves the count from 2 to 0 bench-and-tool bays (1 across by 0 deep), which is the reason to choose between them.
• 10x12 moves the count from 2 to 0 bench-and-tool bays (0 across by 0 deep), which is the reason to choose between them.
• 12x16 moves the count from 2 to 0 bench-and-tool bays (1 across by 0 deep), which is the reason to choose between them.

Because this footprint is planned as a fixed workshop bay standing beside — not instead of — the parking, the useful next reads are different from the ones a differently shaped 3 car metal garage suggests: dedicated workshop bay, garage tool bay layout, bench with own footprint.