Erie, PA Building Setbacks & Zoning: Lot Coverage Limits (2026)

Section 205 of the Zoning Ordinance limits the share of a lot that buildings can cover. In the R-1 Low Density Residential District, buildings may occupy no more than 35 percent of the lot; in R-1A, R-2, R-3, and the RLB Residential Limited Business District, the cap rises to 50 percent. On the commercial and manufacturing side, C-1 and C-2 hold to the same 50 percent limit, C-3 and C-4 allow buildings to cover 100 percent of the lot, M-1 caps coverage at 75 percent, and M-2 allows 100 percent.

16 narrows what counts toward that percentage: it excludes ground-floor roofless decks, swimming pools, and roofless walkways from the lot-coverage calculation, though those same features must still meet the district's setback requirements even when they are excluded from the coverage math. That distinction matters for a homeowner adding a pool or open deck in R-1, where the 35 percent cap is the tightest in the city: the pool or deck itself will not push the lot over the limit, but it still cannot be built inside the required front, side, or rear yard.

A zoning certificate from the Zoning Officer, filed with a plot plan under Section 402, is required before construction begins so the City can confirm the coverage and setback math before the foundation goes in. Exceeding the cap without an approved plan puts the whole structure at risk of being classified a zoning violation regardless of how the rest of the lot is used.