Mercer Island sits in the middle of Lake Washington, so almost every street runs downhill to the water. Lots are steep, the tree canopy is old and tall, and the shoreline lots have banks that move when runoff from the street above has nowhere else to go. Paving to the water is the mistake. The hardscape holds the upper yard and lets the bank be a bank.
King County · ZIP 98040
The terrace stops, then the shore is plants
Wall, patio, and a path along the top. Drainage spread or turned, not shot at the lake. Steps down, if they exist, are few and founded, and they do not become a chute.
We keep fertilizer, fines, and loose gravel out of the design at the edge. Those are what wash. Solid work up top, plants below.
The ground in Mercer Island
Most of our work here is on slopes. A patio or terrace has to be cut into the hill with a real base and a drain behind any wall, or the first wet winter shows where the water wants to go. On the lakefront lots we keep native shrubs on the bank, because they hold the soil better than lawn, and we take runoff to a drain or a rain garden instead of letting it sheet over the edge.
The city is strict about removing large trees and about work near the shoreline. We check what needs a permit before we cut or dig, and we plan around the trees you have to keep. Under those firs and cedars the ground is shady and mossy, so we often turn worn-out lawn into planting beds and stone paths that stay clean year-round.
How we do the work
Hardscape is the permanent part of the yard: the floors you walk, the walls that hold soil, the steps between them. We design it around how water moves and how you move. A pretty patio with a stair that lands in the low spot is a collection of pieces, not a yard.
We would rather build less and have it drain than fill a lot with surfaces that all tip the wrong way. Materials stay limited. One stone, one wall type, so the place looks finished instead of like a showroom.
What we look at first
- The route from the door to the gate, the drive, and the part of the yard you use
- Every place water stands now
- Slopes that need a step or a wall before they need a plant
- What has to stay: trees, fences, the neighbor’s grade
One material, used honestly
Pavers, a wall block or a rock, and gravel. That is usually enough. Mixing flagstone, brick, river rock, and a second paver line makes a small yard loud and gives water more joints to exploit.
Phasing
Drainage and walls first, floors second, plants last. Doing the plants first is how they get buried or trampled. If the budget is a phase, we stop at a stable, drained yard, not at a finished-looking corner that dumps water on the rest.
Steps
Even risers, a tread you can put a whole foot on, and a surface that is not slick when it is wet. Landscape steps are where people fall. We build them like we will use them in the dark, in January.
More from this crew
- Hardscaping across the region
- Paver installation in Mercer Island
- Patio installation in Mercer Island
- Retaining walls in Mercer Island
- Landscape design in Mercer Island
- Hardscaping in Sammamish
Sources for the climate and the water
- USDA plant hardiness map for choosing plants that can take a King County winter.
- EPA WaterSense on watering less once a lawn or a new planting is established.
- EPA Soak Up the Rain on keeping roof and yard water from becoming someone else’s problem.
