It changes the material conversation before it changes the price. In districts like Van Wyck Brooks, Netherwood Heights, and the Crescent Area, what shows from the street is part of the district's fabric, so slate is repaired as slate and visible material substitutions can require review. Practically: expect the scope to grade the existing material slope by slope, expect flashing and detail work to be matched rather than replaced with whatever is on the truck, and expect an honest roofer to tell you where a district rule, not a sales preference, is setting the specification. The upside is real: these roofs were built as century systems, and a repair program on sound slate is usually better money than a tear off.
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