Sammamish sits on a plateau above Lake Sammamish, and most of it was built out as subdivisions in the last thirty years. Under a thin layer of topsoil is glacial till, a hardpan that water barely soaks into, and many lots back onto tall stands of Douglas fir. Shade patios stay slick if they stay wet. Pitch and a clear canopy above the sitting area matter as much as the paver color.
King County · ZIP 98074
A dry enough floor under trees
We will prune for clearance as part of the planning, or we will tell you the patio should move into the light. Building a beautiful floor in permanent drip, over roots, is a maintenance burden.
The base stops where the major roots start. A smaller patio that does not hurt the tree is the better project. We would rather lose four feet than ring-cut a fir.
The ground in Sammamish
The till is the reason so many yards here stay soggy in winter and dry out fast in summer. Water sits on top of the hardpan, so a new lawn or patio needs drainage planned in from the start. We put in French drains, grade the yard away from the house, and build patio bases deep enough that they do not heave.
Many neighborhoods have HOA rules for fences, front yards, and plant choices, and we work to those standards. Lots along the greenbelts get heavy shade and needle drop, so we use shade-tolerant planting and bark where grass has given up. Larger backyards here are a good fit for a full redesign: a paver patio, a low retaining wall to level the slope, and irrigation on a timer for the dry months.
How we do the work
A patio here is a roof at ground level. It has to shed water, it has to sit on rock instead of clay, and it has to meet the door without holding a puddle at the threshold. We build in pavers most of the time because a paver field can be lifted and reset. A cracked slab is a demolition.
We talk about furniture, the grill, and the way you actually walk out before we draw a rectangle that looks big on paper and tips water at the house.
What we look at first
- The door threshold and which way the yard falls
- Downspouts landing in the patio area
- How many people, and whether there is a fire pit or a cover
- Access for excavation
What it costs more to ignore
Drainage and the base. They are the unphotogenic half of the invoice. Cutting them is how a patio gets rebuilt. We would rather build a smaller floor on a real base than a big one on clay.
Furniture first
We size the floor to the table you own, the grill lid that has to open, and the walk around them. A large empty patio with the table in a puddle is a bad large patio. Bring the measurements.
Fire pits
Set in a place the smoke can leave and the embers are not in the bark. The pit sits on the same honest base as the patio, not on four pavers in the dirt. Clearance to the house and to branches is part of the layout, not a surprise after the first fire.
More from this crew
- Patio installation across the region
- Paver installation in Sammamish
- Hardscaping in Sammamish
- Retaining walls in Sammamish
- Landscape design in Sammamish
- Patio installation in Mercer Island
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.
