16x20 Metal Carport

No price appears on this page. The quantities that scale an estimate at 16x20 are 320 square feet of slab, 4 cubic yards of nominal concrete, 1,008 square feet of wall cladding and 330 square feet of roof cladding. Snow, wind and site exposure change what this shape costs to build long before the interior plan does.

Proportion drives cost here as much as size does: 72 ft of wall around 320 sq ft is 0.225 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 a single-vehicle cover with minimal reserve around it is the fit-out single-vehicle cover planning implies, along with framed openings and the height chosen for the 16 ft span.

• the number of open bays and the column spacing
• the anchoring method an open structure needs
• which sides are enclosed now versus later
• the roof drainage arrangement over an open floor

This page is ordered around zoning across the 16-foot span, because that is the dimension a metal carport cannot change later.

The 16-foot width takes 1 vehicle envelope across, but the 20-foot length does not complete a full row once 3 feet of circulation is deducted — the depth is the binding dimension here.

Read this footprint through its span. 16 feet across is the fixed constraint; 20 feet of length is the negotiable one, and at 1.25 to 1 the building is close to square, so movement runs in both directions. A building that cannot be reversed out of is a building that gets used in one direction only.

A 16 by 20 footprint is a mildly directional plan: 320 sq ft enclosed by 72 ft of wall, at a 1.3:1 length-to-width proportion. Along its 20 ft dimension it takes 1 run of vehicle envelopes at 20 ft, leaving 0 ft over — the 0 ft is where the argument about this size actually happens. A compact cover is measured in reserve rather than in area. What matters is how much roof projects beyond the parked vehicle at the front, at the rear and at each side, because those margins are what decide whether the cover keeps rain off the doors as well as off the roof. Roof-mounted racks and boxes are what turn an adequate clear height into a marginal one.

At 16x20 the operating question is a specific one: does the cover extend past the vehicle at both ends, or does the vehicle finish outside the roof line? That is a different question from the one a metal carport of another shape has to answer, and it is why this footprint is planned as a single-vehicle cover with minimal reserve around it rather than as generic covered area.

The use this cover tends to acquire is a two-vehicle cover with a shared center margin: the center margin only takes one door at a time, so parking has to be offset to make both usable. There is nothing to allocate but margin. Every foot of length beyond the vehicle is reserve at one end or the other, and the useful decision is which end gets it — the approach end, where people arrive, or the rear, where equipment collects.

Because 17 feet clears the 4 feet this platform treats as usable, the end of the run is a room rather than a gap: 272 square feet for a walking margin at one side, enough to pass a parked vehicle without turning sideways. Noise from this floor reaches the office, the neighbours and the yard, and separation is a plan decision.

The 6 feet of spare width runs the whole 20-foot length — 120 square feet of wall strip. It earns its keep as shelving, staging or a walking route, not as another vehicle envelope. Temperature swing on a steel shell drives condensation decisions that outrank most layout preferences.

The longest internal travel on a 16 by 20 plan is about 26 ft corner to corner, and the shortest useful one is the 16 ft cross-run. For a a single-vehicle cover with minimal reserve around it that matters where single-vehicle cover planning sits, because shortening the 16 ft run to serve it lengthens every trip along the 20 ft dimension. Attaching to an existing building changes both structures and is an engineering question rather than a bracket choice. That movement pattern, not the 320-square-foot total, is what decides whether the leftover 17 feet is useful here.

The gable clears roughly 8 ft after corner framing: 0 openings at most. With one shallow rank the end wall is the whole access strategy.

20 ft is under one full 20-ft rank with circulation. On 320 sq ft everything faces one way and reaches daylight from the same end.

The 16-ft span holds 1 vehicle envelopes plus 6 ft — most of another position. With 0 ranks behind each other the width sets retrieval order: what goes in first comes out last.

20 ft divides exactly into 2 bays at 10 ft. Openings and lighting set out on that one grid.

One more 10-ft bay makes it 480 sq ft — 50% more floor for one more frame line. Widening past 16 ft changes every frame instead, which is why length is decided late and width early.

Openings are the pinch point here. With 6 feet of spare width the gable cannot host 1 separate doors, so access is either shared or moved to the 20-foot sidewall. Where the building sits on the site changes how much of this floor is genuinely reachable.

The 16 ft ends and the 20 ft sides offer very different opening budgets: 16 ft of end wall has room for one wide opening or two modest ones, while 20 ft of side wall can carry several without the openings competing. On this plan the deciding factor is whether single-vehicle cover planning or clear width and height should be the first thing reached from the door.

At 20-foot nominal bays the structure works with the layout instead of against it: one vehicle envelope per bay line, walls free of awkward half-positions. The count of working positions, not the headline area, is the figure that survives contact with the operation.

One row deep keeps the layout honest — no aisle to protect, no rear zone to serve, and the full 20-foot length available along the wall. Access, not area, is what makes a plan feel small once it is in use.

Extension is cheapest along the 20 ft dimension, where each added bay repeats work already framed; widening past 16 ft is a different frame rather than a longer one. Growing to 16 by 40 adds a 2th run of vehicle envelopes — useful if the constraint is vehicle envelopes rather than the 0 ft already spare at the far end.

Configured as a single-vehicle cover with minimal reserve around it, 16x20 is judged on whether the 0 vehicle envelopes it holds match the operation, and on whether the 6 feet of spare width leaves the route this mode depends on.

• Does the work need one vehicle or one work station, with a narrow margin for shelving on one wall, or does it need a second lane that this 16-foot span cannot give?
• Is the 20-foot length being bought for depth, or for the repeated bays — one or two frame bays, so there is no repeating rhythm to plan against?
• How many open bays do you need, and where do the columns fall relative to the vehicles?
• Which side would you enclose first if the use changes?

The stored configuration carries a 14-foot eave and computes to 16 feet at the ridge on a 3:12 pitch — a 2-foot rise across 16 feet. Height is therefore not uniform, and the sidewall is the constraint. Set the openings before the interior, because the openings cannot move and the interior can.

Clear height under the frame, not the eave figure, is what a vehicle passes beneath, and roof-mounted loads are what consume it. Racks, boxes and antennas are what turn an adequate height into a marginal one.

• 10x10 holds the same 0 vehicle envelopes but changes the leftover depth by -10 feet, which is where the difference is actually felt.
• 10x12 holds the same 0 vehicle envelopes but changes the leftover depth by -8 feet, which is where the difference is actually felt.
• 12x16 holds the same 0 vehicle envelopes but changes the leftover depth by -4 feet, which is where the difference is actually felt.

Because this footprint is planned as a single-vehicle cover with minimal reserve around it, the useful next reads are different from the ones a differently shaped metal carport suggests: single-vehicle cover planning, clear width and height, open-side planning.