Will My Couch Fit Around the Corner?

Checking a couch around a corner

The tool opens on a right-angle corner between two 36-inch hallways, the narrowest hallway the International Residential Code allows in a new US home (3 feet), with a ceiling of 8 feet and an 84-inch three-seat sofa. Put in your own hallway widths, measured at the narrowest point near the corner, your ceiling height and the sofa’s three sizes (legs off). Add the doorway at the end of the hallway as a second step if the sofa has to turn into a room as well.

Each way of holding the sofa (upright, lying back, stood on end, leaning) gets its own search for a path through the turn, and the one leaving the most room wins. The walkthrough then plays that path; the dashed outline marks the tightest moment.

Why length matters at a corner

Through a door, only the sofa’s cross-section has to fit. At a corner the whole length has to swing across the corner while the ends stay inside both hallways, so a long piece jams against the inside corner long before its width is a problem. The table below shows how short a flat piece has to be. It comes from the classic ladder-round-a-corner calculation, which the tool’s own planner reproduces (a check the site’s tests run on every change).

Stand it on its end

That is why sofas are so often stood on end at corners. On its end the sofa’s footprint is only its depth by its height, so it turns like an armchair. The catch is getting it up: halfway through the tip, the diagonal of its back (from the bottom of one end to the top of the other) has to pass under the ceiling. That diagonal is √(length² + height²): about 90¼ inches for an 84 by 33 inch sofa, which clears an 8-foot ceiling, and about 99½ for a 94-inch one, which doesn’t. The tool works this out and leaves out any position the sofa can’t be tipped into.

Reading the result

A result that fits with less than an inch to spare needs care: walls are rarely straight, skirting boards and door frames stick out, and cushions bulge. Wrap the corners, take the legs off, and have one person watch the inside corner while the other swings the end.

The longest piece that goes round flat

Two hallways of the same width meeting at a right angle, the piece carried flat (not tipped), with no room to spare: the longest it can be is 2 × (√2 × hallway width − its width), or the hallway's width itself for a piece short enough to go round without turning. Its width here is the side that faces the walls as you carry it, usually the sofa's depth or height.

Rounded down to the quarter inch or centimetre. A dash: wider than the hallway. Source for the 3-foot hallway: International Residential Code 2021, section R311.6 (via UpCodes), checked September 2026.