Buying old house, demolishing, building new - costs to budget?

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Hi all

Potentially considering buying a house in the Bay Area - Santa Clara. It's an older 1950's smaller house 950 sq ft at less than $1m. This post is less about renting/investment as the end game for this house is that I'd like to live there.  I'm considering demolishing the house (pretty old, small and not the design I'm after) and re-building a newer, larger house as the lot size is very big at over 6000 sq ft.

Has anyone gone through such a process?  I'm curious what the challenges/learns are around getting building permits from the city, what to look out for what selecting an architect, how to select a builder etc. I'd like someone/company to own the design and ideally the build end-to-end.  Are there companies out there that do this?

Thanks in advance!