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How Do I Read a Floor Plan?

The symbols, the scale, and the six things to check on every plan before you fall in love with it.

A floor plan is a horizontal slice through the house, viewed from above, drawn to scale. Once you can read one properly you'll spot problems that photos and renderings hide completely.

Start with scale

Residential plans are commonly drawn at a quarter inch to the foot, meaning a quarter inch on paper equals a foot in reality. Dimensions are usually written in feet and inches. The practical move: take the room you're standing in right now, measure it, and compare. Numbers on a page mean nothing until you've anchored them to a room you know.

The symbols worth knowing

  • Walls. Thick lines. Exterior walls are drawn thicker than interior partitions.
  • Doors. A gap in a wall with an arc showing which way it swings. That arc matters, because it tells you what the door will hit.
  • Windows. Thin lines breaking the wall.
  • Stairs. A run of parallel lines with an arrow showing up or down.
  • Fixtures. Toilets, sinks, tubs and appliances are drawn in outline, roughly to size.
  • Dashed lines. Something above the cut line, like an upper cabinet, a beam or a ceiling change.
  • Electrical. On the electrical plan: outlets, switches, and the lines connecting a switch to what it controls.

The six things to check on every plan

  1. The path from the car. Garage to kitchen, with groceries. Then garage to laundry, with a coat. This one journey causes more regret than anything else.
  2. Furniture fit. Sketch your actual sofa, bed and table into the rooms. A living room can be the right square footage and still have no wall long enough for the sofa, because of doors and windows.
  3. Door swings and collisions. Follow every arc. Doors that hit each other, block a light switch, or open into a walkway are common and easy to fix on paper.
  4. Sight lines. Stand at the front door in your head. What do you see? Now stand at the kitchen sink. Now the primary bed. What you look at from the places you spend time is most of how a house feels.
  5. Privacy and sound. Where are the bedrooms relative to the living space, the laundry and the mechanical room? Who shares a wall with whom?
  6. Storage. Count the closets. Then count what you own. Plans under-provide storage more often than they under-provide square footage.

What plans don't show

Ceiling height, which changes how a room feels more than its footprint does. Natural light and orientation, which depend on how the house sits on your lot. And the elevations, which are where the exterior actually gets decided. Ask to see all of it. See how to choose the right floor plan and browse our plans.