Architectural drawings are the common language of design and construction. Whether you are studying architecture, planning a renovation or just curious about how buildings are described on paper, knowing how to read these drawings helps you understand what will be built and how it will work. This guide covers the three essential views, plus the scales, lines and symbols that give them meaning.
Why a building needs several drawings
A building is three-dimensional, but paper is flat. To describe a 3D object clearly, designers use orthographic projection: separate 2D views, each looking at the building from a specific direction. Together they work like a puzzle that lets you reconstruct the whole. The three most important views are the plan, the section and the elevation.
The floor plan: the building seen from above
A floor plan is a horizontal slice through the building, usually imagined about one meter (or three to four feet) above the floor. Everything above that cut line is removed, so you see walls, doors, windows, stairs and fixed elements as if looking down from above.
On a plan you can usually identify:
- Walls: drawn with thick lines, often filled or hatched to show they are cut by the section plane.
- Doors: shown with a thin arc indicating the direction of the swing.
- Windows: shown as thin parallel lines within a wall opening.
- Stairs: drawn as a series of parallel lines with an arrow showing the direction of travel (usually “up”).
- Rooms and labels: names, areas and sometimes finishes.
- Dimensions: measurements that tell you the size of rooms and openings.
The section: a vertical slice
A section cuts through the building vertically, as if someone sliced it open like a cake. It reveals what plans cannot: floor-to-ceiling heights, the relationship between levels, roof shape, stairs in profile and, in more detailed drawings, the layers of floors, walls and foundations.
On the plan, a section line with arrows shows where the cut is made and in which direction you look. A label such as “A–A” on the plan matches the title of the section drawing. Learning to jump between these references is one of the most valuable reading habits.
The elevation: the building from outside
An elevation is a flat view of one side of the building, as if you stood far away and looked straight at a facade. It shows the exterior appearance: window and door positions, materials, roof outline, levels and proportions. A typical set includes four elevations, often named by orientation (north, south, east, west) or by the street they face.
Quick comparison
| Drawing | Direction of view | Best for understanding |
|---|---|---|
| Plan | From above, after a horizontal cut | Layout, room sizes, circulation |
| Section | Sideways, after a vertical cut | Heights, levels, structure, stairs |
| Elevation | Straight at a facade | Exterior appearance, openings, materials |
Understanding scale
Drawings are reduced versions of reality, and the scale tells you by how much. A scale of 1:100 means that 1 unit on paper represents 100 units in the real building, so 1 centimeter on the drawing equals 1 meter on site. Smaller ratios, such as 1:50, show more detail; larger ones, such as 1:500, are used for site plans. Printing or zooming can distort the size, so rely on the written dimensions and the scale bar rather than measuring blindly.
Line types and symbols
Lines carry meaning. While conventions vary between countries and offices, some patterns are common:
- Thick continuous lines for elements cut by the section plane, such as walls.
- Medium lines for visible edges beyond the cut.
- Thin lines for dimensions, hatches and leader lines.
- Dashed lines for hidden elements or things above the cut, like an overhead beam.
- Dash-dot lines for axes or centerlines, often used for the structural grid.
Every drawing set should include a legend or notes explaining special symbols. Always check it first, especially on projects from different offices.
A simple routine to read any drawing
- Read the title block. Find the project name, drawing title, scale, date and revision.
- Find north and the entrance. Orientation helps you connect plan and elevations.
- Trace the circulation. Follow the path from the front door through the rooms and stairs.
- Check dimensions and levels. Note room sizes, ceiling heights and level changes.
- Cross-reference. Use section lines and labels to move between plans, sections and elevations.
- Imagine the volume. Combine the views mentally until you can picture the building in 3D.
Common reading mistakes
Beginners often assume that a drawing is exact to scale on screen, forget to confirm the units (meters, centimeters, feet) or skip the notes. Another frequent error is mixing up the viewing direction of a section. Always follow the arrows on the section line to know which side you are seeing.
Conclusion
Plans show layout, sections reveal height and structure, and elevations present the building’s face. With a basic understanding of scale, line types and cross-references, even complex drawings become readable. To go further and learn how these drawings are produced with modern software, take a look at the architectural design and 3D modeling courses available on Cursa.
