Great discussion!
In residential, people tend to move around the summer, real estate sales and rental all pickup around the time, so the time to market is usually around then. Winter vacation causes most people to be less active from November to January.
For collaboration work, amazingly I think our steady pace and office job influences our work habits to shift slightly. Is it because most people travel in the summer so we allocate longer schedule, or do we have longer schedule before the winter, so we take time off.
Building departments do get more busy in the summer, and the permitting process gets mixed with the residential work as well.
Taxes and investment ROIs is how the world of investors operate. There may be a tendency to approve and start projects on a cadence, but I'm exactly sure how that works.
Hope others shed their experiences as well!
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Charles Ou-Yang S.M.ASCE
Yorba Linda CA
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