How to Draw a House Floor Plan Online for Free: The Method
Learning how to draw a floor plan of your house takes a tape measure, a rough sketch and a little method, not an architecture degree or software to install. This guide walks through the whole job, from the measurements to take on site to a dimensioned plan you can print or send to a contractor, and shows how to follow each step in Plan², a free floor plan maker that runs in your browser.
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How to draw a floor plan of your house: what to prepare
A floor plan is a view of the house from above, as if the roof were lifted off and everything above about four feet were cut away. People draw one to design a remodel or an addition, to arrange furniture before a move, to compare contractor bids on the same drawing, to show the layout of a home for sale or for rent, or to support a building permit application. Whatever the purpose, a plan is only as good as the measurements behind it. A beautifully drawn plan built on guesses is still wrong.
The equipment is modest, and the drawing itself takes an evening for an ordinary house. The slow part is measuring on site, which is worth doing once and properly.
What you need
- A 25 ft tape measure, or better a laser distance measurer, which reads a room on its own without anyone holding the far end.
- Graph paper, a pencil and a clipboard for the survey sketch, or a tablet to write on.
- A phone camera, to keep a record of each room and any awkward corner.
- Any old plans you can find: the builder’s plan set, the documents from your closing, an appraisal sketch, the permit records at your county. Use them to check your own measurements, never as the only source.
- A browser. Plan² opens on a computer, tablet or phone, with no account and nothing to install.
What to measure
Do the survey on a freehand sketch, room by room, starting with a walk around the outside of the house. At the very least, note:
- the length of every wall, measured at counter height rather than at the floor, where baseboards spoil the reading;
- both diagonals of every room: if they are equal, the room is square, and if not, one corner is not a right angle and you will have to draw it as it is;
- the thickness of each wall, which you can read in the depth of a doorway or a window opening;
- the position of every opening: its width, and its distance from the nearest corner;
- the overall outside dimensions of the house, so you can check them against the sum of the rooms and walls;
- fixed features: stairs, fireplace, columns, ducts, the water heater, the furnace and the breaker panel.
The method: drawing the plan from the outside in
Draw a plan the way a house is built: the structure first, the details after. This is the order that saves you from starting again.
Sketch and measure the house
Draw each room freehand, however roughly, and write the measurements on the sketch: lengths, diagonals and openings. Write feet and inches the way the tape reads them, 12′ 6″, and keep one unit throughout. A readable sketch costs two minutes. A forgotten measurement costs a second visit.
Draw the outside walls
In Plan², pick the Wall tool in the Library and click the start and end of each wall. The grid snaps every point to 6 in, and the end of a wall locks onto the end of the one before, so corners stay closed and follow when you move a wall. Set the Exterior type in the properties, then type the exact length you measured: 12′ 6″, 12-6 or 150 in all work, and a bare number is read as inches.
Add the inside walls
Draw the partitions from corner to corner, or up to the middle of an existing wall, which is then split into a proper junction. Choose the Interior or Partition type according to what you measured in the doorways: a 2×4 wall with drywall on both sides runs about 4½ in, a bare 2×4 frame 3½ in.
Place the doors and windows
Doors, windows, patio doors and garage doors are placed on a wall: they snap to it, take its axis and follow it when it moves. Set the width, then for a door the opening direction and the hinge side.
Check the dimensions and areas
Every wall shows its length and every closed room shows its area in square feet. Compare them with your sketch: the rooms and walls added together should match the outside dimensions to within an inch or two. A bigger gap points to a wrong measurement, so go back and take it again.
Name the rooms
A room closed by walls gets an automatic label (R1, R2…). To name it, trace a Free room over it by clicking its four corners, then type its name in the properties: Living room, Bedroom, Bathroom. Its area is shown with its name.
Furnish and equip
Kitchen cabinets and appliances, bathroom fixtures, heating, electrical and furniture come at usual American sizes that you adjust to the inch. Set them against the walls and check that every door has room to swing.
Add the other floors, then export
For a house with an upper floor or a basement, add a floor above or below and show the neighboring one as a faint overlay to line up the walls and the staircase. Then save the plan as a JSON file so you can reopen it. To print or send it, choose File, then Export…: a PNG image or a PDF, paper from A4 to A0 or Letter, the scale you want, and one file per floor or all floors together.
Work one layer at a time
When the plan fills up, open Layers and pick a mode: All, Structure, Furniture, Electricity, Water or Terrain. A mode locks the other layers so you cannot move a wall while placing outlets, and you can still show or hide each layer. If the house is not square to the screen, turn the view with the north rose, drag it, click it for a quarter turn or right-click it to type an exact angle, rather than redrawing the plan.
Plan conventions: wall thickness, openings, dimensions and orientation
A plan is a shared language. A few conventions are enough for a contractor, a neighbor or a permit reviewer to read yours without you in the room.
Wall thickness
Walls are drawn at their real thickness, not as a single line, because that is what shows which walls carry the building and which merely divide it. Plan² starts from the way American walls are usually framed: 6 in for an outside wall, 4½ in for an inside wall, 3½ in for a partition and 8 in for a retaining wall. They are the Exterior, Interior, Partition and Retaining types.
These are starting points. A house with brick veneer, thick insulation or old plaster-and-lath walls can be thicker, so enter what you measured in the Thickness field rather than keeping the default.
Doors and windows
A door is drawn with its leaf and the arc of its swing, which shows the side it opens to and the space it sweeps. A window is drawn within the thickness of the wall, at its real width.
Plan² places a 3 ft door, a 3 ft window, a 5 ft double window and an 8 ft sliding patio door by default. Change them to match what you measured: older houses often have narrower doors.
Dimensions and areas
A dimension is a length written on the plan, with its extension lines. On a house plan you dimension at least the outside measurements and the length of each wall. Plan² shows these by itself, at three levels of detail, from simple to site-ready. Lengths read in feet and inches, to the nearest quarter inch.
Room areas are calculated on the center line of the walls, so the figure shown is slightly larger than the floor you can actually use between the finished faces. What counts as living area in a listing or an appraisal follows rules of its own, so if you need an official square footage, work it out separately by the rule that applies.
Orientation and scale
Show north: it helps readers judge the sunlight in each room. The site sheets Plan² exports carry a north arrow, and the view can be turned with the north rose, so draw the house the way it sits and turn the view later.
When you export a PDF, Plan² prints it at the scale you choose, from 1:50 to 1:500, on paper from A4 to A0 or on a Letter sheet. Those are metric ratios: the ¼ in to the foot an American house plan often uses is not on the list, so pick the nearest one. Either way, check after printing that a known dimension measures the expected length with a ruler or an architect’s scale: set the print to 100 %, with no “fit to page”.
Worked example: the demonstration house
The figure above shows the demonstration house in Plan², seen from above. It is a single-story house 51′ 2¼″ wide including its garage, and that overall width is dimensioned above the front wall. The scale bar at the bottom and the north arrow at the top right are part of the picture.
The living room and kitchen take up the whole west side, 422 sq ft, with the countertop and sink against the north wall, a table and two chairs, and a sliding patio door opening onto the patio on the south side. Next to it, three rooms are stacked from north to south: the bedroom (161 sq ft) with its queen bed, the laundry (85 sq ft) with its washer and water heater, then the bathroom (85 sq ft) with its bathtub, vanity and toilet. The garage (338 sq ft) closes the house on the east, with a sectional door in the front wall and the car inside.
Look at the walls: the outside walls are thicker than the inner walls between the rooms. Look at the openings too: each one sits on its own wall, and the garage side door opens outwards, beside the car rather than behind it. Every piece of furniture is set against a wall, with no gap of an inch or two to betray a plan drawn in a hurry.
This plan has everything this guide asks for: a closed outline, walls of two thicknesses, openings placed on their walls, named rooms with their areas, furniture at the right size and north shown. The demonstration was laid out in metric sizes, which is why its figures convert to unround feet and inches. Yours will be whatever your tape reads.
Common mistakes when drawing a house plan
- Measuring a wall along one side only. No wall is perfectly straight, so take two measurements at two heights and keep the larger one.
- Forgetting wall thickness. Rooms are measured between the walls, but the plan is drawn with the walls’ thickness: without it, the house on paper will not fit in the real one.
- Skipping the diagonals. A room that is “nearly square” gives a plan that will not close up.
- Putting furniture in front of a door. Check the swing of every door before you furnish.
- Typing a bare number. In Plan² a bare 12 is read as 12 inches, not 12 feet: write 12′ or 12 ft when you mean feet.
- Drawing the furniture first. Walls and openings come first: a sofa moves in a second, a misplaced wall throws everything else off.
- Forgetting to save. A plan that is not exported is gone when you close the tab, so export the JSON file before you leave.
Drawing your house plan in Plan², click by click
Plan² is a free floor plan maker that needs no account and runs in the browser. It opens on a demonstration plan: choose “File”, then “New plan”, to start from a blank page.
You can draw on a phone as well as on a computer. On a touch screen, placement works through a viewfinder: drag the plan under the crosshair, tap to place a point, and tap Finish when the shape is done. A long press, a pinch to zoom and a two-finger twist to turn the view are there too, and the island at the top of the canvas shows the tool in hand with its Cancel and Finish buttons.
- Settings: the gear icon opens them. The size unit is Feet and inches here by default; you can switch to a metric unit. You also choose snapping, whether dimensions show, and how detailed they are (Simple, Advanced or Detailed).
- Walls: pick Wall in the Library, then click the start and the end. The “Walls in a row” option keeps the tool active so you can chain walls. Select a wall to set its length, angle, type and thickness, or drag its handles.
- Openings and furniture: the Library sorts items by family (openings, kitchen, bathroom, electricity, heating, garage, yard) and has a search box. Pick an item, then click the plan to place it.
- Floors: the + buttons on either side of the floor tabs (“Add above” and “Add below”) create a floor, named Floor 1 or Basement 1, next to the Main floor. The floor overlays panel shows other floors faintly, without letting you edit them.
- Undo: Ctrl or ⌘ Z undoes, Ctrl or ⌘ ⇧ Z redoes. The Delete key removes the selected item.
- Save: “File”, then “Export JSON” (or Ctrl or ⌘ S), downloads a copy that “Import JSON” reopens later. The plan stays in your browser and is sent nowhere.
- Export and share: “File”, then “Export…”, opens the export dialog with a live preview. Choose Plan (in color, with furniture and the networks you pick), Technical plan (black and white, dimensioned, to scale) or Site plan; a PNG image or a PDF; the paper size, orientation and scale; and one file per floor or all floors together. The PDF is vector and prints at true scale. “Share as a link” creates an address that holds the whole plan without storing it on a server.
- Layers: the Layers button switches between the modes (All, Structure, Furniture, Electricity, Water, Terrain). The north rose turns the view, and you can pick the unit: feet and inches, or a metric one.
Frequently asked questions
How can I draw a floor plan of my house for free without installing anything?
Open an online editor such as Plan², which runs in your browser with no account or subscription. Draw the walls by clicking their ends, place doors and windows on the walls, and read the room areas in square feet. Then export the plan as JSON to reopen it later, or as a PNG or a PDF to print.
What measurements do I need to draw a floor plan?
Take the length of every wall, both diagonals of each room, the wall thickness in the door and window openings, the width and position of every opening, and the overall outside dimensions of the house. Also note fixed features such as stairs, columns and ducts. Put everything on a sketch, room by room.
Can I type measurements in feet and inches?
Yes. The editor opens in feet and inches in the US, and a length field accepts 12′ 6″, 12-6, 150 in or a fraction such as 6 1/2 in. A bare number counts as inches, so write 12 ft for twelve feet. Lengths are kept to the nearest quarter inch, and you can type metric values if you prefer.
What thickness should I draw the walls on a house plan?
The thickness you measured. Plan² starts from 6 in for an exterior wall, 4½ in for an interior wall and 3½ in for a partition, which is how American walls are usually framed. A house with brick veneer or thick insulation often has thicker walls, so read the thickness in a doorway and type it into the Thickness field.
How are room areas calculated?
Plan² works out the area of each closed room from the center line of its walls, in square feet, and updates it as soon as a wall moves. The result is a little larger than the floor you can use between the finished surfaces. For an official square footage, calculate it separately by the rule your appraiser or listing service applies.
Can I use this plan for a building permit?
It helps you prepare dimensioned 2D drawings, such as a room layout or a site plan. It does not draw sections or elevations, and it does not replace a professional where one is required. Always check which drawings your local building department asks for, and in what format.