yes. i have spent weeks working on this deal. the seller is ready and my workers are too. already got total cost for all required permits for my area, also my comps are good.

My ~$800K development project (commercial) in a tier 1 county resulted from county initiatives, and the economic development group helped me with permits and plans but not financially.

TECHNICALLY, in some areas this work even requires a permit. 

Back then it was best to keep additions below 500sq/ft to decrease costs of permits etc.. check with Sonoma county permit office on specifics.

I have a pending sale on a 3 bedroom 1 bath craftsman single family home built in 1912, it has a non-permitted but livable basement with it's own full bath, sink & separate outside entrance.

Alternatively have your realtor get 10k off the selling price due to no permit and forget about it.

Wondering about the entire process, from gathering permits (if necessary, and would love clarity on this), to executing on the project. 

Funds permitting, I set a goal for 5 SFR's in the next 3 years and see which direction I'd like to take investing from there on. 

I'm assuming, given the scope, that this is going to be a requirement for permits/the building department.

I verified all of the needed information (taxes, flood zone risk, insurance, permits, septic / well information, tree trimming, budget estimates for a new roof...).