A square the size of a generous bedroom is enough - if you choose the right three pieces and accept the right three constraints.
A 48-inch desk, one really good chair, and a wall-mounted monitor arm. Everything else is optional. Skipping the wall mount is the most common mistake - it buys back almost a square foot of desk surface.
Accept that you cannot have storage at the desk; put it on the perpendicular wall. Accept a single monitor. Accept that the chair must roll under the desk fully - check how much space an office chair needs before you commit to a desk depth.

Written by
Marcus WeiEditor and small-space specialist. Has wedged a working office into every apartment he's ever lived in, including a 9'x9' Brooklyn bedroom.

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