Retaining wall cost in Seattle, WA: what 80 permits declare

The median declared cost of retaining wall on Seattle building permits filed 2024–2026 is $25,000. Half of all permits fall between $15,000 and $50,000. The national sourced range on our retaining wall cost guide is $3,192–$9,196 total project.

Median declared cost

$25,000

80 permits

Middle half

$15,000–$50,000

p25–p75

Full span after trimming

$1,000–$135,000

$500 floor, top 1% removed

How to read this

These figures are the project values applicants declared to the Seattle permitting office, which uses them to calculate permit fees. Declared values tend to sit below the final invoice, and jobs done without a permit are not counted at all. Read the median as a floor for a permitted retaining wall job in Seattle, then check it against the sourced national range and get local quotes.

Where the data comes from

Source: Seattle open-data portal, dataset 76t5-zqzr. Filter: residential permits issued 2024-09-09 to 2026-09-09 whose description matchesupper(description) like '%RETAINING WALL%' AND upper(description) not like '%POOL%' AND upper(description) not like '%PATIO%' AND upper(description) not like '%ADDITION%' AND upper(description) not like '%DECK%' AND upper(description) not like '%LANDSCAP%'. Compiled 2026-09-09. Full method on the methodology page; every cell is in the CSV download.