Why survey a building?
A survey is a careful study with measures and records. We survey buildings to save heritage (so repairs are correct), to learn how old and new buildings solve problems, and to make a base drawing before changing a building.
Old buildings (a stone temple, a brick fort), 20th century buildings (a concrete school) and contemporary buildings (a glass office) can all be surveyed. Each tells a story of its time, climate and people.
Context: urban and landscape
No building stands alone. Urban context means roads, neighbouring buildings, open spaces and how people move around. Landscape context means land shape, trees, water, sun path and wind.
Ask: where does the sun rise? Which side is the road? Why is the entrance on this side? How high are the neighbours? Draw a simple site sketch with north, road, neighbours and trees.
Materials and structural systems
Common materials: stone (strong in compression, heavy), brick (small, easy to lay), timber (light, works in tension and bending), steel (strong in tension, makes slim frames), concrete (poured; with steel bars it becomes reinforced concrete).
Structural systems carry loads to the ground:
- Post and beam: horizontal beams on vertical columns, like our pavilion.
- Arch, vault and dome: curved forms that push loads sideways and down.
- Load-bearing wall: thick walls carry the roof.
- Frame: steel or concrete skeleton with thin walls.
Read the building: where are the columns? What does each part carry?
Measuring: manual, mechanical and digital tools
Manual tools: tape measure, plumb line (for vertical), spirit level, graph paper and pencil. Mechanical tools: measuring wheel, optical level and theodolite. Digital tools: laser distance meter, total station, 3D laser scanner, drone and photogrammetry (many photos turned into a 3D model).
Good habits: measure twice, write units (m or mm), draw a quick sketch first, mark the date, and note anything you are not sure of. Use a baseline and check diagonals of rectangles; if both diagonals are equal, the rectangle is square.
Drawing the survey
Back at the desk, turn the field notes into clean drawings to scale: a plan, front and side elevations and at least one section. Add north arrow, scale bar and title. Mark materials and note cracks. These drawings become the basis for repair or a new design.
Try it: survey a doorway
Measure the door of your room: height, width and wall thickness with a tape. Draw its plan and elevation at scale 1:10. Then slide through the four layers in the 3D and compare how a pro would do it.
Key formulas and definitions
- Survey layers: Context → Structure → Measure → Draw
- Scale: real length = drawing length × scale number
- Square check: both diagonals of a rectangle are equal
- Load path: roof → beam → column → base → ground
Worked examples
1. A pavilion has 4 m high columns and a 0.5 m beam. What is its total height above the base?
4 + 0.5 = 4.5 m above the base.
2. On a drawing at 1:50 the building is 12 cm wide. How wide is it in reality?
12 × 50 = 600 cm = 6 m.
3. You measure a room 5 m × 3 m. What should each diagonal be?
√(5² + 3²) = √34 ≈ 5.83 m. If both diagonals are 5.83 m, the room is rectangular.
4. Name the structural system of a stone temple with thick walls and a slab roof.
Load-bearing wall (with post-and-beam elements).
Common mistakes
- Forgetting to write units (m or mm) beside measures.
- Measuring only once. Always check a measure twice.
- Ignoring the context. The road, sun and neighbours explain the building.
- Mixing up scale: at 1:50, 1 cm on paper is 50 cm in reality.