It depends on what kind of house. What kind of rules it comes with.
I remember one old 1880s/1890s house in middle Calvert going through some restoration project. The owner and I had a talk. The owner apparently had to go through alot of hoops to get approval from the committee.
Example 1) .. nails has to be made by blacksmith (pricey).. those square ones, NOT the store bought nails
example 2) Windows has to be custom made (pricey) .. NO double pane whatsoever, NO vinyl whatsoever. nothing from home depot/lowes.
example 3) no insulation made out of fiberglass whatsoever or in other word no insulation in the exterior walls
example 4) forget the fancy HVAC/CAC etc
example 5) must rebuilt with exact kind of wood, i.e. oak, walnut, southern pine etc ( pricey) meaning NO MDF, no plywood, no particle board, etc.
and the list goes on and on ..
Bottom line.. it will cost your life, your time, your energy and your sanity.
All kiddings aside, find out if you have to present the restoration plan or the renovation plan. There is a big difference in restoration and renovation.
Find out if you have to get approval for certain hardware(s) that goes in the house. Find out how long does it "NORMALLY" take to get approval (3 months, 6 months?) on certain restoration process.
Personally, I love me some old houses that was built before 1930s. I wouldn't touch those houses marked "historic registered by xxxxx " for sale with a ten foot pole.