From 1887-1906, permits are grouped in the index under Permits and arranged by owner’s name.
From 1907-1950, the Permits are arranged by address.
While Buffalo's major architectural treasures are increasingly pictured online, the resources needed to research ordinary houses, factories, commercial buildings, churches, and other historic properties are not online and many may never be digitized.
Relevant links have been added wherever possible, but out of necessity, this website focuses on the wealth of offline sources.
It appears that permits were not required for masonry or brick buildings until the early 20th century.