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Allegheny Wall Works

Allegheny County, PA / Town guide

Retaining walls in Mount Lebanon

Allegheny Wall Works connects Mount Lebanon homeowners with licensed local retaining wall contractors for wall repair, replacement, and new installation, starting with a free, no-obligation assessment. Below is the local context that actually matters here: the terrain, the permit triggers, and the age of the walls.

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The ground in Mount Lebanon

Mount Lebanon was cut into rolling South Hills upland during the streetcar era, and its terraced street grid shows it: stone and block walls line front yards, driveways, and alley banks across the municipality. Many of those original walls are now approaching a century of Pittsburgh winters, and the municipality regulates wall and grading work more tightly than most of its neighbors.

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 Virginia Manor, Mission Hills, Sunset Hills and Beverly Heights. The landslide guide explains why that combination deserves respect.

Permit rules in Mount Lebanon

Mount Lebanon sets its own verified trigger on top of the statewide baseline, shown below exactly as the municipality states it. The contractor you are matched with handles the permit process, but knowing the trigger before you plan saves surprises.

Mount Lebanon municipal trigger (verified)

Building permit required for walls over 2 ft. Walls over 4 ft also require engineering drawings.

Source: Mount Lebanon municipal guidance

Statewide baseline (every municipality)

Engineered design required over 48 in of unbalanced fill, or over 24 in of wall height carrying a surcharge such as a slope, driveway, or structure

Source: IRC R404.4 via the PA Uniform Construction Code

Full permit details are available from the Mount Lebanon building department . The metro-wide picture lives in the Allegheny County permit guide.

Wall age in Mount Lebanon

Most of Mount Lebanon was built out in the 1920s and 1930s streetcar suburb boom, so original retaining walls here are among the oldest in the South Hills. Across Allegheny County, 28.1 percent of homes predate 1940 and the median 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.

Cost, response, and scope

What a retaining wall costs, and what happens after you send the form

What does a retaining wall cost in Mount Lebanon?
National cost guides put an ordinary residential retaining wall at $3,500 to $9,400, with a national average of $6,300 (LawnStarter, updated December 2025), and installed cost at $35.41 to $48.62 per square foot for installed dry-stack block up to three feet above grade, before permit fees and general contractor overhead (Homewyse, May 2026). Those are national consumer guides, not government figures and not Pittsburgh figures.
Why those numbers may not cover your wall
They price an ordinary wall, roughly three to four feet. Pennsylvania adopts IRC R404.4 through the Uniform Construction Code, which requires an engineer-stamped design over 48 inches of unbalanced fill, or over 24 inches where the wall carries a surcharge such as a slope, driveway, or structure. On Pittsburgh hillsides that threshold is crossed often, and no published index prices an engineered hillside wall or a slope stabilization job. For that work the licensed contractor who stands in your yard is the only honest source of a number. Our cost guide walks through what moves it.
How fast will someone get back to me?
Calls and form submissions reach Compass Camper LLC directly. We read the request and pass it to an independent licensed local retaining wall contractor, usually within about an hour during the day. That contractor then contacts you to look at the wall and price the work on their own schedule.

Figures read 2026-08-17. Only the independent licensed contractor you are matched with can price your actual wall. Compass Camper LLC does not perform retaining wall work and does not quote it.

Nearby town guides

Updated