My friend Dara bought a sofa for her living room in March. She never measured. It arrived, wouldn’t clear the turn in her hallway, and went back with a fee. Then she tried again with a plan. Paper, a tape, one afternoon. That worked. Here’s what I’d tell anyone starting an interior design floor plan. Measure first. Draw to scale second. Shop last. This guide covers six steps: measure, pick a scale, draw, add furniture, check traffic flow, and check light. You don’t need software. I’d still start with graph paper. I skipped this step once and paid for it. Never again.
What is a floor plan, really?
It’s a horizontal slice through a building, seen from above. One architecture guide says the cut sits about 1.2 meters, or 4 feet, above the floor. That height catches windows, door openings, and counters. Everything above the cut disappears. So a plan isn’t a photo. I mixed this up for years. Dara’s listing plan showed her radiator as a tiny box. She’d never noticed it. It sat right where her sofa was going.
Which scale should you use?
Use 1:50 or 1:100 for a home. UK council guidance asks for a standard metric scale of 1:50 or 1:100. It also asks for a scale bar. At 1:50, one centimeter on paper equals 50 in the room. That suits a single room. At 1:100, a whole floor fits on one page. In the US, a quarter inch to a foot is common. That’s convention, so check what your contractor expects. Dara used 1:50, and the living room filled one sheet nicely.
How do you measure a room?
Sketch it freehand first. Then measure wall to wall along the floor and write each number on the sketch. Measure every door and window opening. Note how far each sits from the nearest corner. Add the ceiling height, radiators, and anything that sticks out, like a chimney breast. Measure twice. Dara’s walls weren’t square, and many older houses aren’t. A laser measure is handy. A steel tape works fine. Don’t forget the space a door needs to swing.
How do you draw an interior design floor plan by hand?
Grab graph paper. Let each square stand for one foot, or use a scale ruler. Draw walls as double lines so they have thickness. Mark each door opening with an arc for the swing. Windows go in as thin lines inside the wall. Add a north arrow and label the rooms. It takes about an hour. Mine took two, because I redrew the hallway three times. Pencil first. Ink only when you’re sure.
What do the symbols mean?
Standard conventions include door swings, window indications, stairs with direction arrows, and dashed lines for elements above the cut. Electrical and heating symbols change by country, though. Check the legend on any plan you’re handed. No legend? Ask. Dara’s plan had a symbol she couldn’t read. It was the radiator, naturally. Stairs always show an arrow pointing up. If you can read doors and windows, you can read most of a plan.
How do you test furniture on the plan?
Cut paper shapes to scale and slide them around. Take the sofa, bed, and table dimensions from the product listing. Add door swings and drawer space. Leave roughly 30 to 36 inches for main walkways. That’s a design convention, not a code. In a small room, you’ll cheat a little. Dara’s first sofa fit on paper. It just didn’t fit the hallway turn she hadn’t drawn. She added the hallway and tried a shorter one.
How do you check traffic flow?
Walk the plan with your finger. Start at the front door. Go to the kitchen, then the bedroom, then the bathroom. Does the route cut through your seating area? Does it clip a table corner? Those are congestion points. Dara rotated her sofa 90 degrees. The route cleared. She’d have never spotted it standing in the actual room, because the actual room was full of boxes.
Does natural light belong on a floor plan?
Yes, once you add north. Many people like bedrooms with morning sun and living rooms with afternoon light. That’s a preference, not a rule. In the northern hemisphere, south-facing windows get the most sun. Dara’s living room faces north. She put her reading chair by the window anyway. The light is soft there, not bright. She likes it.
Should you use software or paper?
Paper first. Software second. Tools like RoomSketcher, SketchUp, and AutoCAD cover the range, from simple drag-and-drop to full drafting. I haven’t tested them all, so I won’t rank them. Software shines for sharing with a contractor or building a 3D view. Paper is better for thinking. I find I make fewer mistakes when I’m erasing by hand.
Can you find an existing plan?
Sometimes. Ask the real estate agent, the builder, or the building archive. For older homes, a local historical society library may hold old drawings. Always check them against the actual room, since renovations change things. Dara got hers from the landlord’s agent. It was missing an extension someone had added years ago. She measured it herself.
Conclusion
Dara’s second sofa arrived in May. It’s shorter, and it went through the hallway on the first try. Her plan is still taped to the fridge. There’s a pencil smudge where she rubbed out a wall. Beside it sits a paper cutout of the old sofa, curled at the corners. She hasn’t thrown it away. She says it’s a reminder. Last week her neighbor asked how she knew it would fit. She pointed at the fridge.
FAQs
How do I make a floor plan of my house?
Sketch each room freehand, then measure wall to wall and note every door and window. Redraw it on graph paper at 1:50 or 1:100. Add furniture as paper cutouts.
What scale should I use for a floor plan?
UK planning guidance uses a standard metric scale of 1:50 or 1:100. Use 1:50 for a single room and 1:100 for a whole floor. In the US, a quarter inch to a foot is common. fife
How much space do you need between furniture?
A common rule of thumb is 30 to 36 inches for main walkways. It’s a design convention, not a code. Tight rooms often get less.
Can I make a floor plan for free?
Yes. Graph paper, a tape measure, and a pencil are enough. Many free online floor plan tools also exist if you want a 3D view later.
