PlanningLearned
How to read a planning drawing without panicking
A calm route through plans, sections, elevations and all the lines that initially look the same.
- Written by
- Nadia Saki
- Published
- 17 February 2026
- Updated
- 12 August 2026
- Reading time
- 8 min read
Begin with the title block
The title block tells you what you are looking at: the project, drawing type, scale, date and revision. Check whether the drawing shows the existing building or the proposed work before interpreting anything else.
Next find the north point and scale. These two small pieces of information anchor the drawing in the real world.
Plans are horizontal slices
Imagine cutting through the building at roughly chest height and looking down. Thick lines are usually elements being cut, while thinner lines tend to show surfaces or objects beyond.
Door arcs show the direction a door opens. Dashed lines often describe something above or hidden, but always check the legend because conventions can vary.
Use drawings together
A plan explains arrangement, a section explains height and an elevation explains the outside face. No single drawing tells the whole story. Match grid lines, room names and window positions across them.
If something appears inconsistent, check the revision before assuming you have misunderstood it. Drawings are a coordinated set, and sometimes the set has not caught up with itself.
Notes from the desk.
Get new Reading Room pieces when they are ready. No content treadmill, just useful notes.