Site Development & Utilities for 22 Homes in Seattle

The client brought us in for the sitework on a 22-home development in south Seattle, packed onto a 27,000 square foot lot with a budget around $1.5 million. The site was just grass and trees, so we stripped the sod, cleared the trees, and hauled it all off to open room for the foundation work. The real challenge showed up once we started digging: the native soils weren't stable enough to build on.

To fix that, we over-dug two extra feet under the foundations, laid biaxial geogrid, and backfilled with imported structural fill compacted into solid building pads. The Geotech stayed on site through that whole process so every pad met the geotechnical requirements before anyone built on it. From there it was heavy underground work on a tight lot: over 500 feet of sewer, more than 2,000 feet of storm including the permeable pavement facilities, over 1,000 feet of water, and more than 800 feet of electrical conduit trenching, plus subgrade prep for the hardscapes. We sequenced it carefully and stayed in close contact with the developer, engineers, and inspectors, wrapping our work in 2026 with the site ready to build on.