A detail drawing is a construction drawing that shows a specific part of a structure at a larger scale (zoomed in), with all dimensions, materials and connection details. Where a floor plan shows the whole, a detail drawing shows how a specific junction is constructed — for example how the gutter connects to the fascia board, or how the foundation transitions into the wall.
What are detail drawings used for?
| Application | Example |
|---|---|
| Planning permission | The local authority wants to see how the structure is built in detail |
| Construction | The builder needs to know how a junction is made |
| Structural calculations | The structural engineer draws connection details |
| Ordering | Dimensions for window frames, steel, prefab elements |
Common details
- Foundation-wall junction — How the wall sits on the foundation (plinth, DPC)
- Roof edge — How rafters, fascia board, gutter and roofing come together
- Frame junction — How the window frame sits in the reveal (shimming space, finishing, weatherproofing)
- Cavity closure — How the cavity is sealed around windows
- Eaves detail — How the roof connects to the wall plate
Scale
| Scale | Use |
|---|---|
| 1:100 | Floor plan, overview |
| 1:50 | Cross-sections |
| 1:20 | Details |
| 1:10 or 1:5 | Fine details (window frames, connections) |
For DIY
With building plans (such as those from fredsdiyplans.com) you receive detail drawings for all critical junctions. This makes the difference between a well-built structure and one that leaks, cracks or sags.
Related terms
- Building permit
- Building code
- Building regulations
- Window frame