Retaining walls in Penn Hills

The ground in Penn Hills

Penn Hills is deeply cut terrain east of the city, dropping to the Allegheny River near Verona and carved by the Plum Creek and Thompson Run valleys. Whole postwar plans were benched into these hillsides, and the municipality has an unusually large stock of mid-century block walls holding driveways and backyards on slopes underlain by red-bed claystone.

The bedrock story is the same across the metro: weak red-bed claystone that loses strength when wet, under a slow-creeping blanket of colluvium. Walls doing real structural work are a common sight around Universal, the Rodi Road corridor, the Frankstown Road corridor and the slopes above Verona. The landslide guide explains why that combination deserves respect.

Permit rules in Penn Hills

Penn Hills enforces the statewide baseline below. A specific municipal threshold for this municipality is not published in a form this site has verified, so treat the baseline as the floor, not the whole answer.

Confirm the exact local permit threshold with the Penn Hills building department before starting work. The metro-wide picture lives in the Allegheny County permit guide.

Wall age in Penn Hills

Most of Penn Hills was built in the 1950s and 1960s boom, which puts its original walls at 60 to 75 years old. Across Allegheny County the median home build year is 1957 (US Census ACS 2020 to 2024 five-year estimates).

Walls age like the houses they came with. If a wall here is leaning, bulging, or shedding material, the failing wall page covers what an assessment looks for, and the hillside page covers slopes that are moving with or without a wall.