What matters for project planning
Designation is the record that reaches a deck. On a designated property, a structure visible from the street can attract review touching material, railing style and proportion rather than merely size, and that applies to a defined set of parcels rather than to a neighborhood's general appearance -- so the answer is address-specific. The stormwater and drainage side matters through the ground instead: excavation for footings is site disturbance, and a recorded easement crossing the back of a lot can rule out the obvious location before any design work begins.
Official sources
Verify the property, not just the city
None of the general Richland or Lexington County information above tells you what applies to your specific parcel. Confirm flood status, historic designation, drainage easements, and existing conditions with the city and your selected provider before work is scoped.
Sources reviewed June 20, 2026. External requirements and maps can change.