- Design (SD → DD → CDs): weeks to several months depending on complexity.
- Permitting: see below.
- Procurement / long-lead items: switchgear, rooftop units, elevators, and specialty equipment can have long lead times — order early.
- Construction: the durations in the table above.
- Closeout / CO / inspections: days to a few weeks.
Ask Pereff AI about this topic
Pereff AI can go deeper — giving you project-specific ranges, comparing delivery methods, and answering follow-up questions instantly. Every answer is cited.
Ask: “Tell me more about The phases of time”Want a project-specific take?
Articles give you the framework. Real numbers come from preconstruction — and Pereff charges nothing for that first conversation.
Start a Project