Whether a guard is worth buying in Salisbury
The historic districts have the mature, deliberately planted street canopy of a town that has been prosperous for a very long time, with large hardwoods over the roofs on most of those streets. It is a heavy and sustained debris load, and it falls on buildings where the cleaning access is among the most difficult in the service area. The newer development at the edges of the city is conventional and much lighter.
Run that against the arithmetic before anyone quotes you. A guard is bought to remove a recurring cost, so the question is what that cost actually is. A clean here is $110 to $165 single-storey and $155 to $235 two-storey. Aluminium micro-mesh across 150 feet is $1,050 to $1,950. On a house needing one visit a year, that is between seven and eighteen years of cleaning bought up front, and the guard will want attention inside that window. On a lightly treed lot we will tell you not to buy one, and it is the most profitable line on our price list.
Where there is genuine canopy the case is real, and the product choice is decided by what is dropping. Willow oak leaves are a few inches long and under an inch wide, and pine needles are narrower still. Both pass straight through the perforated aluminium screens that make up most cheap guards, and then sit in the trough under a lid you now have to remove to clean, which is worse than no guard at all. Micro-mesh has an aperture finer than a pine needle is wide, and it is the only category we will fit under oak or pine.
The honest limit: mesh does not eliminate maintenance, it changes it. Pollen and shingle grit film the surface and water starts sheeting over rather than through, so a guarded house wants an annual rinse at $85 to $150. Nobody in this category enjoys saying that. It is still true, and it is on the quote in Salisbury the same as anywhere.

What Salisbury itself changes
The housing in Salisbury
Salisbury holds one of the most substantial historic housing stocks in North Carolina: the Salisbury Historic District with hundreds of contributing buildings, plus North Main Street from roughly 1900 to 1930, Brooklyn-South Square and North Long Street-Park Avenue. Late Victorian, Colonial Revival and Craftsman bungalows in real quantity. On buildings of that quality the gutter is part of the elevation rather than a utility bolted to it, and a stock K-style run in a modern finish is a visible compromise on a house that was designed with something else in mind.
Getting to the gutters
Among the hardest in the service area, and for the same reason the buildings are worth looking at. Victorian and Craftsman houses are tall relative to their footprint, with steep pitches, turrets, dormers and wrap-around porches that put runs above roofs rather than above ground. A significant proportion of Salisbury historic work is roof access rather than ladder access and is quoted individually. This is not a town where a per-foot rate quoted over the phone means much.