Buying a historic St. Augustine home: the rules, honestly.

The city runs five local Historic Preservation zoning districts (HP-1 through HP-5) spanning everything from Spanish-period structures to 20th-century buildings — and inside them, alterations and demolition require approval from the Historic Architectural Review Board. Layered over that, seven National Register districts contain roughly a quarter of the city’s building stock on just 7% of its land. And separately, the three gateway streets — King Street, San Marco Avenue, and Anastasia Boulevard — carry their own Design Standards for Entry Corridors (adopted 2003, updated 2016–2019), with review running through HARB or the Corridor Review Committee depending on location.

The practical takeaway: which layer your specific parcel sits in decides what you can change, how long approvals take, and what your renovation budget really is. It is address-specific — two houses a block apart can live under different rules — which is why I pull the zoning layer for any historic-area home before a buyer falls in love with a renovation plan.

Inside HP districts, alterations and demolitions need HARB approval, guided by the Architectural Guidelines for Historic Preservation; new construction needs a Certificate of Appropriateness. But the net is wider than the districts: planning demolition and reconstruction of any building 48 years or older requires an evaluation letter and a Certificate of Demolition — and FULL demolition of any building 50 years or older requires HARB review anywhere in the city, regardless of zoning. In a city this old, that catches unassuming 1970s concrete-block houses, not just coquina landmarks. And “demolition” includes partial demolition — tearing off a significant portion counts, and preservation staff review the replacement design.

The process itself is navigable if you respect its rhythm: HARB meets the third Thursday of each month, applications go through the city’s permit portal against advertised deadlines, staff-level decisions can be appealed to the board within 30 days, and board decisions appeal to the City Commission. Budget the calendar, not just the dollars — a project that needs two hearings is a project that takes two extra months. Homes in the Historic District, live from the MLS →

First: in HP-1 zoning — the heart of the old city — short-term rentals require a MONTHLY or greater rental period, under Ordinance 1989-51, on the books since August 1989. Buyers modeling nightly-rental income on a downtown historic purchase are modeling something the zoning has prohibited for over three decades in that district. Rental rules vary by district and the details matter enormously; I verify the exact zoning and rental posture per address before any investment conversation gets serious.

Second, the good news almost nobody claims: HARB also reviews applications for the historic preservation ad valorem tax exemption — for both the city and St. Johns County. Qualifying restoration work on a designated historic property can earn a property-tax exemption on the improvement value. It is the rare corner of this regulatory layer that pays you, and it belongs in the math on any serious restoration purchase.