36x40 Barndominium

This page is ordered around height and clearance, because at 36x40 the 14-foot eave limits a barndominium sooner than the plan does.

3 level zones fit across the 36-foot width with only 0 feet left over, which is a tight fit: the width is fully committed and nothing can be widened later without moving a wall.

Commitment first: 45% of the 1,440 square feet goes to level zones at 216 square feet each, and 504 square feet survives as edge strip. A footprint is worth its own decision when that split lands where the work does. The span is the commitment; everything inside it is rearrangeable later, and the 36-foot dimension is not.

A 36 by 40 footprint is a near-square plan: 1,440 sq ft enclosed by 152 ft of wall, at a 1.1:1 length-to-width proportion. Along its 40 ft dimension it takes 2 runs of level zones at 18 ft, leaving 4 ft over — the 4 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. Separation requirements between a dwelling and a working space are determined by the authority having jurisdiction for the specific building.

This footprint is planned as a plan that uses height, with living space over or beside a double-height working volume. At 1.11:1 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 38 by 38 instead, the same 1,440 sq ft would stand 2 level zones across rather than 2, 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. 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. Plumbing grouped near the boundary keeps runs short in a building that is longer than a house.

Across a 36-foot span the 3:12 pitch adds 4.5 feet between eave and ridge. The centreline measures 18.5 feet; anything parked or stacked near a wall lives with the 14-foot eave. An empty building looks generous and a working one rarely does; plan against the working state.

Height on a 36 ft span is a separate decision from the 40 ft length, and it is the span that sets the frame's behavior. Raising the eave over 1,440 sq ft affects every bay along the 40 ft dimension, so the test is whether barndominium with a mezzanine genuinely needs the extra clear height or only the floor area.

The living half is a conditioned envelope and the working half often is not, which makes the dividing plane the most important detail in the building.

36 ft across takes 3 level zones and leaves 0 ft. Across only 1 rank of depth that leaves nothing spare for racking or a bench; those go outside the level zone positions or not at all.

40 ft divides exactly into 4 bays at 10 ft. Partitions, openings and lighting rows all land on the same 10-ft grid.

The 36-ft gable clears about 28 ft after corner framing — 2 module-width openings abreast. The 40-ft sidewall takes up to 2 openings with piers between, which is where a second entry belongs.

14 ft survives at the end of the run — 504 sq ft across the full width. That is a zone to name before the frame is ordered, not a leftover to discover after it.

At 14 ft a 11-ft platform across 36 ft would add about 396 sq ft. Framing for it now is a drawing change; adding it to a finished frame is a structural one.

The living-and-working balance this footprint could equally be planned around is an even split where the dividing line is the building's main design decision: there is no central band, so the two halves meet on a single wall and every service has to pick a side. Dividing the 1,440 sq ft by the 12 by 18 ft level zone gives roughly 4 positions before circulation is deducted a second time for cross movement. Whether the plan keeps 4 or drops to 2 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?

Depth arithmetic leaves a working end zone here. 504 square feet sits past the last row, which is why 36x40 tends to be planned with the stair run and its landing, which has to be found in the plan before anything else is arranged around it designed in rather than added later. Doors and their approaches decide more about daily use here than the enclosed area does.

Only 0 feet of width is spare, so there is no wall strip: anything set along a sidewall comes out of a level zone's clearance. The building is fixed for decades while the operation inside it changes every few years, and the plan has to survive that.

At 1.11:1 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 38 by 38 instead, the same 1,440 sq ft would stand 2 level zones across rather than 2, 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. 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. Plumbing grouped near the boundary keeps runs short in a building that is longer than a house. That movement pattern, not the 1,440-square-foot total, is what decides whether the leftover 14 feet is useful here.

Openings are the pinch point here. With 0 feet of spare width the gable cannot host 3 separate doors, so access is either shared or moved to the 40-foot sidewall. Ground conditions and drainage decide the floor before the frame does.

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 2 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. The floor treatment is a use decision that outlasts most of the equipment standing on it.

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. Two operations of the same size can want opposite plans, so the arithmetic below is a starting point rather than a recommendation.

Extension is cheapest along the 40 ft dimension, where each added bay repeats work already framed; widening past 36 ft is a different frame rather than a longer one. Growing to 36 by 58 adds a 3th run of level zones — useful if the constraint is level zones rather than the 4 ft already spare at the far end.

Configured as a plan that uses height, with living space over or beside a double-height working volume, 36x40 is judged on whether the 3 level zones it holds match the operation, and on whether the 0 feet of spare width leaves the route this mode depends on.

• Does the work need two parked lanes with a walking gap between them, or one lane and a deep work zone, or does it need a second lane that this 36-foot span cannot give?
• Is the 40-foot length being bought for depth, or for the repeated bays — three or four repeated frame bays, which sets a clear grain for partitions and rack lines?
• 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?

• 12x20 moves the count from 3 to 0 level zones (0 across by 0 deep), which is the reason to choose between them.
• 12x24 moves the count from 3 to 1 level zones (1 across by 1 deep), which is the reason to choose between them.
• 16x20 moves the count from 3 to 0 level zones (1 across by 0 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.

Quantities, not prices, are publishable here: roof cladding runs 1,484 square feet — 3% above the 1,440-square-foot floor at a 3:12 pitch — with 17.8 cubic yards of nominal slab beneath it. Neighbouring buildings, setbacks and the approach road often decide the orientation before the plan does.

The inserted floor, its structure and the stair are the significant items. They are also the items that cannot be added later without disrupting the working volume.

• 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