Planning large workplace projects: critical path, lead times, and honest buffers.

The typical realistic timeline

For a large workplace transformation of 3,000–10,000 m² in the Randstad, we see in practice: strategy + workplace concept 3 to 6 months, definitive design 4 to 6 months, permits + technical design 3 to 5 months, execution 6 to 10 months, occupancy and aftercare 2 to 3 months. Total 18 to 30 months from first directional choice to stable use.

Projects shorter than 18 months are possible, but almost always trade off strategic depth or construction quality. Projects longer than 30 months suffer from changing business context.

Items that are structurally underestimated

Five items are structurally underestimated on virtually every plan:

• Permits — municipalities apply statutory timelines, but actual handling time is often 4 to 8 weeks longer.
• Delivery of installations and facade materials — international supply chain has been unpredictable for years.
• Specialist custom components (cabinets, acoustics, AV) — 12 to 20 weeks lead time is common.
• ICT implementation and cutover — almost always underestimated in day-to-day transition.
• Stakeholder approval and works council consent — social dynamics have their own rhythm.

The critical path rarely sits where you expect

The critical path in workplace projects often runs not through construction but through client decision moments. A board decision delayed by a week, works council consent waiting a month, an award procedure hitting a procedural bump — these internal delays cumulatively cost more than any execution obstacle.

A good project plan makes these decision moments explicitly visible, not only construction activities. Part of this is a governance discipline that treats decision rhythm as part of planning.

Buffers — honest versus concealing

A plan without buffers is a promise of overrun. A plan with too generous buffers becomes self-fulfilling (work slides to the end of available time). The right discipline: 10 to 15 percent buffer on each phase, visible as such in the plan, with explicit management.

What does not work: hidden buffers in every activity. What also does not work: one large buffer at the end. What does work: per phase a consciously assigned buffer with agreed trigger rules for consumption.

The difference between handover and occupancy

Handing over a workplace is not the same as 'ready for use'. Between handover and a stably working building sits typically 6 to 12 weeks of ICT shakedown, acoustic fine-tuning, desk allocation and user guidance. Those who do not explicitly plan this period hand over a workplace that is 'finished' and yet does not work.

A serious change discipline runs through this phase, not only after it.