Woodinville · King County
Grading & Drainage in Woodinville, WA
Grading, French drains, retaining walls and RV and equipment pads across Woodinville, from the Sammamish valley and Hollywood Hill. Built so water moves away from the house instead of toward it.
Why drainage matters on Woodinville properties
Soft river deposits with high groundwater in the valley, glacial till on the hills. That is the root of most wet-yard, wet-crawlspace and failing-patio problems we see. Water that cannot soak in runs along the surface or perches on the hard layer until it finds the lowest point.
The flat Sammamish River valley through the middle, with Hollywood Hill and the Wellington and Leota areas climbing on either side. Slopes push water downhill onto the next lot, and flat ground leaves it nowhere to go. Getting the grade right is cheaper than fixing what water does to a foundation.
The Sammamish River, Little Bear Creek and Bear Creek are salmon streams with wide buffers, and the valley floor is floodplain in places. Where drainage can legally discharge depends on these features, so we plan the outlet first and the trench second.
Common grading projects in Woodinville
Wet yards and crawlspaces
Regrading and French or curtain drains for Woodinville yards that stay soggy all winter because water perches on the hard till below.
Pads for RVs, shops and equipment
Compacted gravel pads for RVs, trailers, shops and equipment on Woodinville properties, built thick enough not to rut in the wet season.
Grading away from the foundation
Reshaping the ground around Woodinville homes in Downtown Woodinville and Hollywood district so it falls away from the house, the cheapest fix for water at the foundation.
Ditches and culverts
Cleaning and regrading drainage ditches, and setting culverts under driveways, on the low, wet ground around Woodinville.
Downspout tightlines
Connecting downspouts to solid pipe that carries roof water to an approved outlet instead of dumping it next to a Woodinville foundation.
What our grading work in Woodinville covers
- Retaining Walls
- French Drains & Footing Drains
- Rough & Finish Grading
- RV & Equipment Pads
- Yard Drainage Correction
- Erosion Control
Permits & Rules
Grading and retaining wall permits in Woodinville
Inside city limits, the City of Woodinville handles grading permits; outside them, the King County Department of Local Services. Small regrading and yard drains usually do not need one, but larger volumes of cut or fill, work in a critical area, or changes to how water leaves the property often do.
Retaining walls taller than about four feet, or walls holding back a driveway or slope, typically need engineering and a permit. We build to the approved plan and can tell you on the site walk when a wall is likely to need one.
Cost & Timing
What affects the cost of grading in Woodinville
We do not publish flat prices because no two Woodinville sites are the same. These are the things that move the number most here.
Tight lots
Narrow side yards and alley access in Woodinville mean compact equipment and shorter truck loads. We plan it so it costs less than it could.
Soft ground
Where Woodinville soils are soft or wet, over-excavation, fabric and imported rock are often part of the job, and we price that in up front.
Buffers and permits
Work near Woodinville's rivers, creeks, lakes or shoreline can need permits and limits on where machines go. That affects scope and schedule more than price.
Size of the property
On Woodinville acreage, longer haul distances inside the property and bigger volumes change the math. Bigger jobs often cost less per unit.
Haul-off and disposal
How much material leaves the site, and what it is, drives cost. Our own trucks keep that predictable on Woodinville jobs.
When to schedule grading in Woodinville
Grading in Woodinville goes best in the drier months, when soil compacts properly and trenches stay open. Wet-season work is doable with erosion control and the right material, and we plan for it in the quote.
Woodinville's till soils hold water through the winter, which is when drainage problems show up. That is a good time to see where water goes, and the dry season is the time to fix it.
On Woodinville's floodplain ground, the river sets the calendar. Low-lying work is planned for the dry season, after high water has dropped.
Where We Work
Grading and drainage across Woodinville
Woodinville is known for its wineries in the Sammamish River valley, but the hills around it are full of horse properties, wooded acreage and large-lot homes. Pasture clearing, driveways, drainage and tree work are all common here.
We regrade yards, install French drains and curtain drains, build block and rock retaining walls, and set gravel RV and equipment pads across Downtown Woodinville, Hollywood district, Hollywood Hill, Wellington, Leota and Cottage Lake area.
Large-lot homes and horse properties on the hills, newer townhomes and apartments near downtown. Older lots often have no real drainage at all, while newer ones sometimes have drains that were never connected. We find out which before we dig.
We also do grading nearby in Bothell, Kenmore, Kirkland and Lake Forest Park. See everything we do in Woodinville, read our full guide to grading, or browse all service areas.
Why DirtRaptor
Why Woodinville owners call us for grading
Owner on the machine
On Woodinville jobs you talk to the person who walks the site, writes the quote and runs the equipment.
Trees and dirt, one crew
If trees are in the way of your Woodinville project, we take them down ourselves instead of waiting on a separate tree service.
Our own trucks
Haul-off and deliveries run on our schedule along SR 522 and SR 202, not a subcontractor's.
Rural property experience
Pastures, shops, arenas and long drives are everyday work for us around Woodinville.
How a grading job runs
- 01
Site Assessment & Water Tracing
- 02
Design & Elevations
- 03
Excavation & Base Preparation
- 04
Build, Drainage & Backfill
Real Jobs
Recent DirtRaptor work near Woodinville
Demolition · Edmonds, WA
Driveway Removal & Concrete Prep
Tearing out an old blacktop driveway and prepping the ground for a new concrete pour — broken material hauled off, base left clean and ready.
Demolition · Everett, WA
Condemned 100-Year-Old Shed Teardown
A 100-year-old shed, condemned and unsafe, brought down and hauled off — the site left graded flat and clean.
Questions
Grading & Drainage in Woodinville: FAQs
Why does water collect around homes in Woodinville?
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Soft river deposits with high groundwater in the valley, glacial till on the hills. When water cannot soak in, it follows the surface toward the house. Regrading so the ground falls away from the foundation, plus a drain where needed, usually solves it.
Do retaining walls need a permit in Woodinville?
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Walls over about four feet, or walls supporting a driveway, building or slope, usually need engineering and a permit from the City of Woodinville (or the King County Department of Local Services outside city limits). Shorter landscape walls often do not. We confirm before building.
Where can drainage water go on my Woodinville property?
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It has to go somewhere approved: an existing storm system, a dispersion area or an infiltration trench where the soil allows. The Sammamish River, Little Bear Creek and Bear Creek are salmon streams with wide buffers, and the valley floor is floodplain in places. We plan the outlet before we trench.
How much does grading cost in Woodinville?
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It depends on the site, so we quote after a free site walk rather than guessing on the phone. The biggest drivers in Woodinville are usually tight lots, soft ground, buffers and permits. You get a written number with inclusions and exclusions spelled out.
When is the best time to schedule grading in Woodinville?
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Grading in Woodinville goes best in the drier months, when soil compacts properly and trenches stay open. Wet-season work is doable with erosion control and the right material, and we plan for it in the quote.
My Woodinville address is outside city limits. Who handles permits?
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Many Woodinville addresses are actually in unincorporated King County, where the King County Department of Local Services handles permits. We check the parcel before quoting.
Can you clear brush and build a riding arena on my Woodinville property?
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Yes. We clear the area, strip the topsoil, build a compacted rock base and grade it to drain, then haul off the spoil on our own trucks.
How long does a retaining wall take to build?
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A short accessible garden wall can be a couple of days. A taller engineered wall with drainage, geogrid and difficult access runs considerably longer. Base preparation takes more time than most people expect, and it is not the part to rush.
Ready for a real number in Woodinville?
Send the address and a few photos. We walk the site for free and come back with a written quote.
