50x80 Barndominium

This page is ordered around height and clearance, because at 50x80 the 16-foot eave limits a barndominium sooner than the plan does.

The footprint holds 16 level zones — 4 across by 4 deep — and the remaining 0 feet is marginal: there is no clear stair run, so the stair lands in the middle of a working or living space and disorders both.

What distinguishes 50x80 is depth behaviour: 4 rows along 80 feet after 8 feet of circulation, with 0 feet unaccounted for at the end of the run. Snow, wind and site exposure change what this shape costs to build long before the interior plan does.

A 50 by 80 footprint is a clearly directional plan: 4,000 sq ft enclosed by 260 ft of wall, at a 1.6:1 length-to-width proportion. Along its 80 ft dimension it takes 4 runs of level zones at 18 ft, leaving 8 ft over — the 8 ft is where the argument about this size actually happens. Using height is the way a modest footprint holds both a dwelling and a workspace, but it converts the plan into a stair problem. The run, the landing at each end and the headroom below are the constraints, not the mezzanine area, and they are decided before the rooms are. Noise transfer, not floor area, is the usual complaint in a combined building.

This footprint is planned as a plan that uses height, with living space over or beside a double-height working volume. Spent as a square 63 by 63 instead, the same 4,000 sq ft would stand 4 level 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. Compared with a 50 by 60 of the same width, the extra depth here adds run rather than reach: it buys about 4 level zones in line, and every position past the second is retrieved by moving what stands in front of it. This is the scale at which informal habits start to fail: two people working at once need the routes named on the plan rather than agreed by memory. Vertical movement is the daily pattern, so what lives upstairs should be what is used at the start and end of the day rather than what is used constantly. The boundary between living and working space is the decision the whole building is organised around.

Span drives headroom at 50x80: 50 feet of width on a 4:12 pitch puts 24.3 feet over the middle and 16 feet at the walls, so where a tall item stands matters as much as how tall it is. Rows that cannot be entered independently end up used as one long space.

Height on a 50 ft span is a separate decision from the 80 ft length, and it is the span that sets the frame's behavior. Raising the eave over 4,000 sq ft affects every bay along the 80 ft dimension, so the test is whether barndominium with a mezzanine genuinely needs the extra clear height or only the floor area.

Ventilation across 4,000 square feet at this height: the working half generates air the living half should never receive, so the boundary handles air as well as sound.

50 ft across takes 4 level zones and leaves 2 ft. With 4 ranks behind each other the width sets retrieval order: what goes in first comes out last.

80 ft divides exactly into 5 bays at 16 ft. Over 4,000 sq ft a single 16-ft grid is the difference between a plan and an accumulation.

80 ft is deep enough for 4 ranks and a zone behind them. 4,000 sq ft needs a stated route through it; without one the middle silts up.

16 ft carries a genuine second level: 15 ft deep across the 50-ft width is 750 sq ft more floor. Framing for it now is a drawing change; adding it to a finished frame is a structural one.

The 50-ft gable clears about 42 ft after corner framing — 2 module-width openings abreast. At 4 ranks deep the useful pattern is end in, side out, using the 80-ft wall's 4 possible positions.

260 ft of wall encloses 4,000 sq ft, against 253 ft for a square of the same area — a 3% difference. Little of the enclosure exists only because of the shape.

The living-and-working balance this footprint could equally be planned around is a working building with a compact residential end rather than a house with a shop: there is no separate lined bay, so the residential end shares the shop's air, temperature and noise. Dividing the 4,000 sq ft by the 12 by 18 ft level zone gives roughly 12 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 12 or drops to 8 comes back to the question this footprint is really answering: has the stair been given a real position, or is it going to be squeezed in once the floor plan is settled?

The 0-foot leftover depth falls under the 8 feet this platform treats as usable for a barndominium, so there is no clear stair run, so the stair lands in the middle of a working or living space and disorders both. Fire separation, egress and occupancy are determined for the specific building and can reshape this plan entirely.

Width is fully committed at 50x80. With 2 feet spare, wall storage and passing room compete with the level zones directly. The mezzanine that is added afterwards is the change order that reprices the frame.

Spent as a square 63 by 63 instead, the same 4,000 sq ft would stand 4 level 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. Compared with a 50 by 60 of the same width, the extra depth here adds run rather than reach: it buys about 4 level zones in line, and every position past the second is retrieved by moving what stands in front of it. This is the scale at which informal habits start to fail: two people working at once need the routes named on the plan rather than agreed by memory. Vertical movement is the daily pattern, so what lives upstairs should be what is used at the start and end of the day rather than what is used constantly. The boundary between living and working space is the decision the whole building is organised around. That movement pattern, not the 4,000-square-foot total, is what decides whether the leftover 0 feet is useful here.

Openings are the pinch point here. With 2 feet of spare width the gable cannot host 4 separate doors, so access is either shared or moved to the 80-foot sidewall. Circulation width is the first thing surrendered under pressure and the first thing missed afterwards.

Upper-level daylight has to be planned into the endwall or the sidewall above the working volume; a plan that leaves it until later ends with dark rooms over a bright shop.

Nominal bay division computes to 4 bays at about 20 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.

Depth here creates a hierarchy: 4 rows means front positions get used and rear positions get filled. Deciding which is which up front is what keeps 50x80 workable. Judge the plan by what has to happen on the worst day of the year, not on an average one.

Growth happens along the ground rather than upward, because a second inserted floor rarely suits the structure that carried the first.

Configured as a plan that uses height, with living space over or beside a double-height working volume, 50x80 is judged on whether the 16 level zones it holds match the operation, and on whether the 2 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 80-foot length being bought for depth, or for the repeated bays — six to eight repeated bays, and the bay line becomes the organising device for the whole plan?
• Where does the dividing wall sit, and what does the working half lose when it moves?
• Is there a loft, and has the frame been planned for it rather than around it?

No price appears on this page. The quantities that scale an estimate at 50x80 are 4,000 square feet of slab, 61.7 cubic yards of nominal concrete, 4,160 square feet of wall cladding and 4,216 square feet of roof cladding. Two feet of spare width reads as nothing on a plan and as a great deal when a machine is being turned.

Proportion drives cost here as much as size does: 260 ft of wall around 4,000 sq ft is 0.065 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 plan that uses height, with living space over or beside a double-height working volume is the fit-out barndominium with a mezzanine implies, along with framed openings and the height chosen for the 50 ft span.

• the length assigned to finished living space
• the envelope and separation detail between the two halves
• two service sets rather than one
• the finished ceiling height and any loft over the living half

• 40x40 moves the count from 16 to 4 level zones (2 across by 2 deep), which is the reason to choose between them.
• 36x48 moves the count from 16 to 4 level zones (2 across by 2 deep), which is the reason to choose between them.
• 30x60 moves the count from 16 to 6 level zones (2 across by 3 deep), which is the reason to choose between them.

Because this footprint is planned as a plan that uses height, with living space over or beside a double-height working volume, the useful next reads are different from the ones a differently shaped barndominium suggests: barndominium with a mezzanine, stair placement, living space above a shop.