Concrete Retaining Walls in Puyallup, WA

Retaining walls in Puyallup: what to know

The city maps potential landslide ground by slope, in two classes: 16 to 39 percent, and 40 percent and steeper. Lots on the valley wall or a steep plateau edge are the ones likely to fall inside. In and beside mapped landslide hazard areas, the city’s grading exemptions shrink to excavation under 3 feet and 30 cubic yards, or disappear altogether in some landslide categories.

Walls on the valley floor are a different case. The ground is flat, groundwater can sit high, and Pierce County flood planning documents describe a creek-mouth flood gate that closes when the Puyallup runs high. A wall drain there needs an outlet we have actually traced, not one we assume will work in January.

Permits and rules in Puyallup

Inside Puyallup, the city’s building permit page requires a permit for retaining walls over 4 feet from the base of the footing, or any wall retaining a surcharge. On unincorporated South Hill, Pierce County uses a similar 4 foot rule and exempts shorter walls only if they carry no surcharge and meet a 1:1 offset ratio. Before we quote, we check wall height, load, and slope mapping against current requirements, and we coordinate engineering and permits when they apply.

Rules change and vary by parcel, so we confirm the current requirements with the city before we start.

How we approach it

Map slope class and critical-area status before choosing wall height
Trace a working outlet for the wall drain before pouring
Split tall grade changes into shorter terraced walls where space allows
Fold grading limits and engineering into the plan from the start

For the full process, see our Retaining Walls page.

Building in the cold months? See our guide to winter concrete pours.

Our retaining walls work, serving Puyallup

Examples of our work. We build retaining walls in Puyallup and the cities around it. See all of our work

Questions from Puyallup homeowners

Does a wall holding up my driveway need engineering in Puyallup?

Usually. A driveway is a surcharge, and the city requires a building permit for any retaining wall carrying one, whatever its height. That means engineered plans from the start, and we coordinate them with the footing and drainage design.

My lot is on the slope above the valley. Will the city treat it as a landslide area?

Only if it falls inside the city’s mapped slope classes, which start at 16 percent. The city’s GIS publishes the landslide layer, and we check your parcel against it. If you are inside one, excavation and fill limits tighten and a geotechnical report may follow.

Can I terrace my South Hill yard in Puyallup instead of building one tall wall?

Often, and shorter walls can stay under the height that triggers a permit. Terraces still count as grading, so fill over 8 inches, added load, and slope rules apply. We check the wall heights and the grading limits together.