12 Floor Plan Symbols

Floor plan symbols are not decorative. They are a language. Unlike a rendered drawing, which shows what a building looks like, a floor plan with symbols shows what a building is made of and how it works. The symbols are standardized so that architects, engineers, contractors, and building inspectors can read the same drawing—whether they speak English, Spanish, or Mandarin. The challenge is not learning every symbol (there are hundreds) but learning the logic: walls are thick lines, doors are arcs, windows are thin lines between walls, and appliances are simplified outlines.

1. Wall Symbols (Thick for Cut, Thin for Above)

Walls are the most fundamental element of a floor plan. A wall that is cut by the horizontal section plane (at 1.2-1.5m above the floor) is shown as a thick line (0.5-0.7mm). A wall above the cut plane (e.g., a second-floor wall shown on the ground floor plan) is shown as a thin dashed line or thin solid line (0.18-0.25mm). A partition (non-load-bearing wall) is often shown as a thinner line than a structural wall. The thickness of the wall on the drawing represents the actual wall thickness (e.g., 100mm for a stud wall, 200mm for a masonry wall).

This symbol is for all floor plans. The emotional effect is structural, hierarchical, and thick.

Quick Specs

• Cut wall line weight: 0.5-0.7mm (thickest on the drawing).
• Above-cut wall line weight: 0.18-0.25mm (thin, often dashed).
• Partition line weight: 0.35-0.5mm (medium).
• Wall thickness on drawing: scaled from actual (e.g., 100mm stud wall = 2mm at 1:50 scale).

2. Door Symbols (Arc for Swing, Pocket for Sliding)

Doors are shown by the door swing (an arc) and the door leaf (a straight line). The arc shows the direction the door opens. The arc should not cross other symbols (e.g., a toilet or a stair). A pocket door (sliding into the wall) is shown as a straight line sliding into a dashed pocket in the wall. A double door is shown as two arcs (opening outward or inward). The door thickness on the drawing is usually 1-2mm (representing 40-50mm actual thickness).

This symbol is for all floor plans. The emotional effect is swinging, sliding, and directional.

Quick Specs

• Door leaf line weight: 0.35-0.5mm.
• Door swing arc line weight: 0.18-0.25mm (thin, often dashed).
• Door thickness on drawing: 1-2mm at 1:50 scale.
• Pocket door: straight line sliding into a dashed pocket (wall thickness doubled at pocket).

3. Window Symbols (Thin Lines Between Walls)

Windows are shown as three thin parallel lines between the wall lines. The outer lines represent the window frame; the center line represents the glazing or mullion. A sliding window is shown with an arrow indicating the sliding direction. A casement window (hinged) is shown with an arc (like a door) or a triangle indicating the hinge side. A bay window is shown as a projection from the wall with angled lines.

This symbol is for all floor plans. The emotional effect is thin, transparent, and between.

Quick Specs

• Window lines: 0.18-0.25mm (thin).
• Number of lines: 3 (frame, glazing/mullion, frame).
• Window sill height: noted on the drawing (e.g., “Sill 900mm”).
• Bay window: angled lines (30-45 degrees) projecting from the wall.

4. Stair Symbols (Parallel Lines with Arrow)

Stairs are shown as a series of parallel lines (each line represents one tread) with an arrow indicating the direction of travel (up or down). The arrow points up (from the lower floor to the upper floor). A dashed line indicates the stair is above (on the floor above) or below (on the floor below). The stair width (the length of the parallel lines) is the actual stair width (900-1200mm typical). A landing is shown as a break in the parallel lines (a blank space).

This symbol is for all multi-story floor plans. The emotional effect is ascending, descending, and directional.

Quick Specs

• Tread line spacing: 250-300mm (actual tread depth) scaled.
• Stair width: 900-1200mm (actual) scaled.
• Arrow: thin line (0.25mm) with arrowhead, labeled “UP” or “DN”.
• Dashed stair: indicates stair above (on the floor above).

5. Door and Window Tag Symbols (Numbers and Circles)

A door tag is a circle (6-10mm diameter on the drawing) with a number inside. The number corresponds to a door schedule (a table listing door sizes, materials, hardware). A window tag is a hexagon or a circle with a number inside, corresponding to a window schedule. The tag is placed near the door or window, not overlapping the symbol. The leader line (if used) is thin (0.18mm) and ends with a dot or arrow.

This symbol is for construction documents (CD sets). The emotional effect is tagged, scheduled, and specified.

Quick Specs

• Door tag circle diameter: 6-10mm (on drawing).
• Window tag shape: circle or hexagon, 6-10mm diameter.
• Tag number: 1-2 digits (e.g., “D1”, “W5”).
• Leader line: 0.18mm thin line with a dot at the end.

6. Electrical Symbols (Outlets, Switches, Lights)

Electrical symbols show the location of outlets (receptacles), switches, light fixtures, and panels. A duplex outlet (standard wall outlet) is shown as a circle with two parallel lines (or a semi-circle). A switch is shown as a circle with a line (or an “S”) and a dashed line indicating which fixture it controls. A light fixture is shown as a circle (with an X for ceiling-mounted, a dot for recessed, or a specific shape for pendant). The electrical plan is often a separate drawing, but basic symbols appear on architectural plans.

This symbol is for electrical plans and architectural plans with electrical notes. The emotional effect is electrical, switched, and illuminated.

Quick Specs

• Outlet symbol: circle (6mm diameter) with two parallel lines (or a semi-circle).
• Switch symbol: circle (6mm diameter) with a line (or “S”) and a dashed line to the fixture.
• Ceiling light: circle (6mm diameter) with an “X” inside.
• Recessed light: circle (6mm diameter) with a dot in the center.

7. Plumbing Symbols (Sinks, Toilets, Tubs, Showers)

Plumbing symbols show the location of fixtures (sinks, toilets, bathtubs, showers, floor drains). A sink is shown as a rectangle (or a simplified outline) with a circle (the drain) or an “X”. A toilet is shown as a circle (the bowl) with a smaller circle (the tank) or an oval. A bathtub is shown as a rectangle with a smaller rectangle (the tub) and a circle (the drain). A shower is shown as a square (or a rectangle) with an “X” or a circle (the drain). A floor drain is shown as a circle with a dot or a “D”.

This symbol is for plumbing plans and architectural plans with plumbing notes. The emotional effect is plumbed, drained, and wet.

Quick Specs

• Toilet symbol: oval or circle (bowl) + smaller circle (tank).
• Sink symbol: rectangle (basin) + circle (drain).
• Bathtub symbol: rectangle (tub) + circle (drain) at one end.
• Shower symbol: square (stall) + “X” or circle (drain).
• Floor drain: circle (6mm diameter) with a dot or “D”.

8. Furniture Symbols (Simplified Outlines)

Furniture symbols show the location and orientation of furniture on a floor plan. The symbols are simplified outlines (not detailed drawings). A sofa is shown as a rectangle with two smaller rectangles (armrests) or a rounded shape. A bed is shown as a rectangle with a smaller rectangle (pillow) or two circles (pillows). A table is shown as a circle (round table) or a rectangle (rectangular table) with smaller circles (chairs). The furniture symbols are drawn to scale (a 2m sofa is 40mm at 1:50 scale).

This symbol is for presentation drawings, furniture plans, and space planning. The emotional effect is furnished, scaled, and occupied.

Quick Specs

• Sofa: rectangle (1500-2500mm long) with armrests or rounded ends.
• Bed: rectangle (1000-2000mm wide x 2000mm long) with pillow rectangles.
• Dining table: rectangle (800-1000mm wide x 1500-2500mm long) with chairs (circles or squares).
• Chair: square or circle (500-600mm diameter).
• Desk: rectangle (600-800mm deep x 1200-1800mm wide).

9. Appliance Symbols (Kitchen and Laundry)

Appliance symbols show the location of kitchen and laundry appliances: refrigerator, stove/range, dishwasher, washer, dryer. A refrigerator is shown as a rectangle (with a circle (compressor) or an “R”). A stove/range is shown as a rectangle with four circles (burners) or two circles (ovens). A dishwasher is shown as a rectangle with a wave (water spray) or a “D”. A washer is shown as a circle (front-loading) or a rectangle with a “W”. A dryer is shown as a rectangle with a “D” or a circle.

This symbol is for kitchen plans, laundry plans, and architectural plans with appliance notes. The emotional effect is appliance-sized, located, and connected.

Quick Specs

• Refrigerator: rectangle (700-1000mm wide x 700-900mm deep) with “REF” or a circle.
• Stove/range: rectangle (600-900mm wide x 600-750mm deep) with four circles (burners).
• Dishwasher: rectangle (600mm wide x 600mm deep) with “DW” or a wave.
• Washer: rectangle (600-700mm wide x 600-700mm deep) with “W”.
• Dryer: rectangle (600-700mm wide x 600-700mm deep) with “D”.

10. HVAC Symbols (Registers, Thermostats, Diffusers)

HVAC (heating, ventilation, air conditioning) symbols show the location of supply registers, return grilles, thermostats, and diffusers. A supply register (where heated or cooled air enters the room) is shown as a rectangle with diagonal lines (hatching) or an “S”. A return grille (where air returns to the system) is shown as a rectangle with horizontal lines or an “R”. A thermostat is shown as a circle with a “T” or a small rectangle. A diffuser (ceiling-mounted) is shown as a circle with crossed lines (like a target).

This symbol is for HVAC plans and architectural plans with HVAC notes. The emotional effect is heated, cooled, and ventilated.

Quick Specs

• Supply register: rectangle (200-600mm long) with diagonal hatching or “S”.
• Return grille: rectangle (200-600mm long) with horizontal lines or “R”.
• Thermostat: circle (6mm diameter) with “T” inside.
• Diffuser: circle (6-10mm diameter) with crossed lines (like a target).

11. Dimension and Annotation Symbols (Arrows, Leaders, Text)

Dimension and annotation symbols show the size of rooms, the distance between walls, and notes about materials or construction. A dimension line is a thin line (0.18mm) with arrowheads (or tick marks) at both ends. The dimension number is centered above the line (or between tick marks). A leader line is a thin line (0.18mm) with an arrowhead (or dot) at one end, pointing to a note. A note is text (2-3mm tall) describing a material, finish, or construction detail.

This symbol is for all architectural drawings. The emotional effect is measured, noted, and specified.

Quick Specs

• Dimension line: 0.18mm thin line with arrowheads (2-3mm long) at ends.
• Dimension text: 2-3mm tall, centered above the line.
• Leader line: 0.18mm thin line with arrowhead or dot at the end.
• Note text: 2-3mm tall, at the end of the leader line.

12. Landscaping Symbols (Trees, Shrubs, Plants)

Landscaping symbols show the location of trees, shrubs, plants, and lawn on a site plan. A tree is shown as a circle (the canopy) with a smaller circle (the trunk) and sometimes a cross or star. The canopy diameter is drawn to scale (a 5m canopy is 100mm at 1:50 scale). A shrub is shown as an irregular circle (or a group of small circles). A lawn is shown as a stipple (dots) or a hatch. A planting bed is shown as a wavy line with plant symbols inside.

This symbol is for site plans, landscape plans, and presentation drawings. The emotional effect is planted, landscaped, and green.

Quick Specs

• Tree canopy: circle (scaled to actual canopy diameter) with a trunk dot.
• Tree symbol: circle + smaller circle (trunk) + optional cross (to indicate deciduous or evergreen).
• Shrub: irregular circle (or group of small circles) with a dot.
• Lawn: stipple (dots) or diagonal hatch.
• Planting bed: wavy line (edge) with plant symbols inside.

Comparison Summary

Conclusion

Floor plan symbols are the alphabet of architectural drawing. Without them, a floor plan is just a collection of lines. With them, a floor plan becomes a specification: this wall is concrete, this door swings inward, this window is fixed, this outlet is GFCI-protected, this toilet is wall-hung, this tree is a deciduous oak.

The twelve categories presented here cover the most common symbols used in architectural practice:

Wall Symbols show what is cut (thick) and what is above (thin). The thickness of the line communicates the importance of the element.

Door Symbols show direction. The arc tells you which way the door swings—into the room or out. A pocket door slides into the wall (saving space).

Window Symbols show the frame and glazing. Three thin lines between the wall lines tell the contractor: “window here.”

Stair Symbols show direction of travel. The arrow points up (from the lower floor to the upper floor). Dashed lines show a stair above.

Door and Window Tags connect the drawing to a schedule. “D1” on the plan means “look at the door schedule for the size, material, and hardware of this door.”

Electrical Symbols show where power and light go. A duplex outlet, a switch, a ceiling light—these symbols tell the electrician where to install.

Plumbing Symbols show where water and waste go. A toilet, a sink, a bathtub—these symbols tell the plumber where to connect.

Furniture Symbols show how the space will be used. A sofa, a bed, a dining table—these symbols tell the client how the room will be furnished.

Appliance Symbols show where the refrigerator, stove, dishwasher, washer, and dryer go. These symbols tell the contractor where to put the water, gas, and electrical connections.

HVAC Symbols show where heated and cooled air enters the room, where air returns, and where the thermostat is located.

Dimension and Annotation Symbols tell the story. “3600” means the wall is 3.6m long. “EXISTING BRICK” means the wall is existing brick (not new).

Landscaping Symbols show the site. Trees, shrubs, lawn, planting beds—these symbols tell the landscaper what to plant and where.

When drawing floor plan symbols, ask: Is the symbol to scale? A door leaf should be the actual door width (e.g., 900mm = 18mm at 1:50). A tree canopy should be the actual canopy diameter (e.g., 5m = 100mm at 1:50). Symbols that are not to scale (like a toilet or a light switch) should be consistently sized.

Ask: Is the symbol clear? A contractor should not have to guess whether a line is a wall or a window. Use the correct line weights: thick for cut, thin for above, medium for partitions.

Ask: Is the symbol labeled? A first-time reader may not know that a circle with an “X” is a ceiling light. Add a legend to the drawing (a box with all symbols and their meanings).

Ask: Is the symbol consistent with the schedule? If the door schedule says “D1: 900mm x 2100mm solid core wood”, the door symbol on the plan should be a single door (not a double door) and the tag should say “D1”.

The best floor plan is not the one with the most symbols. It is the one where every symbol is necessary, every line weight is intentional, every tag matches its schedule, and the legend explains the rest. It is a drawing that can be built.