Space Planning and Functional Layout
Circulation and Zones
Space planning organizes a dwelling around circulation (paths of movement) and functional zones (public, private, service, and work). Good plans separate noisy public zones from quiet private zones and place service areas such as kitchens and laundry near entries and utilities. Understand clearance, the open floor area needed for use and movement, and work triangle logic in kitchens linking sink, refrigerator, and range.
Concepts to Know
Know typical clearance rules of thumb: about 36 inches of walkway in main circulation, roughly 42 to 48 inches of aisle in a work kitchen where two people pass, and adequate turning space for wheelchairs, commonly a 60-inch circle or a T-shaped turnaround. Understand universal design principles: equitable use, flexibility, simple and intuitive use, perceptible information, tolerance for error, low physical effort, and appropriate size and space. Distinguish accessible (meets code minimums) from universal (usable by the widest range of people without adaptation).
Traps
Questions often show a layout with a door swing blocking a workspace or a path crossing through a work zone. Another trap confuses furniture arrangement with space planning; structural walls and plumbing locations constrain layout more than decor. Watch for bedroom plans where the only closet blocks egress, or bathrooms where the door conflicts with the fixture clearance.
Worked Example
A 10-by-12-foot bedroom must fit a queen bed (about 5 by 6.7 feet), two nightstands, and a dresser while preserving a 36-inch path to the closet and door. Place the bed centered on the longest unbroken wall, keep 36 inches clear on the entry side, and reserve the wall opposite the door for the dresser so no door swing intersects it.
Rule of thumb: draw circulation first, place fixed elements second, and furnish last; if a door swing crosses a work zone, the plan fails.