Plan efficient command space for complex construction sites. Size work areas, meeting zones, and storage. Export results, justify layouts, and brief crews with confidence.
| Project context | Workstations | Area per workstation (m2) | Meeting seats | Circulation (%) | Contingency (%) |
|---|---|---|---|---|---|
| Roadworks field office | 10 | 4.5 | 6 | 22 | 8 |
| Mid-rise building site | 18 | 5.0 | 10 | 25 | 10 |
| Industrial plant shutdown | 28 | 5.5 | 14 | 28 | 12 |
| Large infrastructure package | 40 | 6.0 | 20 | 30 | 15 |
The calculator works in three estimation modes. All modes convert to a net usable area first, then add circulation and contingency.
For early design, start with occupancy. For fit-out, use room-by-room for tighter control.
Command facilities vary by project size, security, and reporting demands. A practical estimate starts with net usable space for work, meetings, and support rooms, then adds circulation and contingency to reflect real movement and growth. Use this article to select inputs, justify assumptions, and document decisions for stakeholders.
A command area is the operational hub for permits, drawings, planning boards, and daily briefings. Right-sizing reduces crowding, improves decision speed, and supports safety controls. This calculator converts staffing and room needs into a defendable area allowance for temporary facilities and site offices.
Workspace-based sizing suits known desk counts for engineers and supervisors. Occupancy-based sizing fits peak shifts and hot-desking where headcount drives demand. Room-by-room sizing is best for detailed layouts, because it totals each room type and makes procurement and fit-out scope clearer.
Area per workstation increases with multiple screens, secure storage, and printing zones. Meeting seats should match the largest briefing group expected inside the command area. Storage and IT allowances rise when document control, PPE issuance, radios, and network equipment are handled in the same module.
Circulation covers corridors, door swings, queuing, and movement between zones. Contingency covers growth during critical phases, added reporting roles, and reconfiguration. Applying both factors produces a gross figure that matches real container layouts and reduces late changes on site.
Review the breakdown to see the largest drivers, then run scenario checks. If a site limit is exceeded, optimize meeting capacity, adjust workstation density, or split welfare functions. Export CSV for cost plans and PDF for approvals, revisions, and audit trails.
Net is usable working and support space. Gross adds circulation and contingency to reflect corridors, internal movement, and growth allowances. Gross is typically closer to the footprint required for real site office layouts.
Occupancy-based works well at tender because headcount is usually known earlier than detailed room lists. Update to workspace or room-by-room once the project team structure and fit-out scope are confirmed.
Use higher ratios when document control, QA/QC, and reporting are heavy. Use lower ratios when the command area is mainly coordination and supervision, with separate modules handling administration or storage.
Only include toolbox talks if they occur inside the command space. If toolbox talks are done outdoors or in separate welfare modules, keep meeting seating focused on coordination meetings and visitor briefings.
Circulation captures movement space that is not directly usable. Contingency covers future team growth and reconfiguration. Together they reduce the risk of under-sizing when the project enters peak activity phases.
Start with the breakdown. Reduce meeting seats, increase shared desks, or remove duplicate rooms. Splitting welfare or storage into a separate module can also relieve pressure without harming coordination.
Yes. The PDF is suitable for review and record keeping, while the CSV supports estimating and scenario comparison. Attach exports to your planning notes so assumptions and revisions remain traceable.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.