What drives the range
Red-clay slopes, mature tree canopy, and additions tucked onto older homes all affect access. A crew working under oaks with limited driveway clearance faces a different job than one on a flat, open new-construction lot, even before materials are chosen.
Material and scope
Fiber-cement, wood, and vinyl carry different labor, fastening, and finish requirements, and repair boundaries, disposal, and any finish restoration should be spelled out rather than assumed.
Permits and North Fulton specifics
Historic-district review, tree-protection ordinances, and floodplain rules can all apply depending on the parcel. Confirm requirements with the City of Roswell and the chosen provider before work starts.
These are planning factors, not pricing. A property-specific written scope is the only reliable number.