Mountlake Terrace · Snohomish County
Grading & Drainage in Mountlake Terrace, WA
Grading, French drains, retaining walls and RV and equipment pads across Mountlake Terrace, from Lake Ballinger to Terrace Creek. Built so water moves away from the house instead of toward it.
Why drainage matters on Mountlake Terrace properties
Glacial till with a seasonal perched water table. The Lake Ballinger and Hall Creek lowlands carry softer, wetter soils. 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.
Mostly flat to gently rolling upland, dropping into the Hall Creek and Terrace Creek ravines and down to Lake Ballinger on the north end. 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.
Lake Ballinger, Hall Creek and Terrace Creek all carry shoreline or stream buffers, and Terrace Creek Park is a protected wooded ravine. Where drainage can legally discharge depends on these features, so we plan the outlet first and the trench second.
Common grading projects in Mountlake Terrace
Wet yards and crawlspaces
Regrading and French or curtain drains for Mountlake Terrace yards that stay soggy all winter because water perches on the hard till below.
Retaining walls on slopes
Block and rock retaining walls that hold back sloped Mountlake Terrace yards and driveways, built with drainage behind them so they last.
Grading away from the foundation
Reshaping the ground around Mountlake Terrace homes in Town Center and Lake Ballinger 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 Mountlake Terrace.
Downspout tightlines
Connecting downspouts to solid pipe that carries roof water to an approved outlet instead of dumping it next to a Mountlake Terrace foundation.
What our grading work in Mountlake Terrace 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 Mountlake Terrace
Inside city limits, the City of Mountlake Terrace handles grading permits; outside them, Snohomish County Planning and Development Services (PDS). 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 Mountlake Terrace
We do not publish flat prices because no two Mountlake Terrace sites are the same. These are the things that move the number most here.
Slope and access
Steep Mountlake Terrace lots take smaller machines, more careful staging and sometimes engineering, which adds time compared with flat, open ground.
Tight lots
Narrow side yards and alley access in Mountlake Terrace mean compact equipment and shorter truck loads. We plan it so it costs less than it could.
Soft ground
Where Mountlake Terrace 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 Mountlake Terrace's rivers, creeks, lakes or shoreline can need permits and limits on where machines go. That affects scope and schedule more than price.
Haul-off and disposal
How much material leaves the site, and what it is, drives cost. Our own trucks keep that predictable on Mountlake Terrace jobs.
When to schedule grading in Mountlake Terrace
Grading in Mountlake Terrace 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.
Mountlake Terrace'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.
Where We Work
Grading and drainage across Mountlake Terrace
Mountlake Terrace was built out quickly in the decades after World War II, and much of the housing stock is from that era. Now the light rail station and Town Center are bringing new density, while older homes are being remodeled or replaced.
We regrade yards, install French drains and curtain drains, build block and rock retaining walls, and set gravel RV and equipment pads across Town Center, Lake Ballinger, Terrace Creek, Melody Hill and Cedar Terrace.
Mostly 1950s and 60s ramblers on modest lots, many with original sheds, carports and failing concrete, plus new apartments and townhomes near the station. 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 Brier, Lake Forest Park, Shoreline and Lynnwood. See everything we do in Mountlake Terrace, read our full guide to grading, or browse all service areas.
Why DirtRaptor
Why Mountlake Terrace owners call us for grading
Owner on the machine
On Mountlake Terrace 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 Mountlake Terrace 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 I-5 and 236th St SW, not a subcontractor's.
Built for slopes
We plan machine placement, drainage and erosion control for Mountlake Terrace's sloped ground before we start.
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 Mountlake Terrace
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 Mountlake Terrace: FAQs
Why does water collect around homes in Mountlake Terrace?
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Glacial till with a seasonal perched water table. The Lake Ballinger and Hall Creek lowlands carry softer, wetter soils. 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 Mountlake Terrace?
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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 Mountlake Terrace (or Snohomish County Planning and Development Services (PDS) outside city limits). Shorter landscape walls often do not. We confirm before building.
Where can drainage water go on my Mountlake Terrace 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. Lake Ballinger, Hall Creek and Terrace Creek all carry shoreline or stream buffers, and Terrace Creek Park is a protected wooded ravine. We plan the outlet before we trench.
How much does grading cost in Mountlake Terrace?
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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 Mountlake Terrace are usually slope and access, tight lots, soft ground. You get a written number with inclusions and exclusions spelled out.
When is the best time to schedule grading in Mountlake Terrace?
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Grading in Mountlake Terrace 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.
Can you tear down an old carport or shed in Mountlake Terrace?
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Yes. Small outbuildings are a regular job. We take the structure and slab out, sort the debris, haul it on our own trucks and leave the ground graded. Older structures may need an asbestos survey first, which we walk you through.
Do you work near Lake Ballinger?
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Yes, with care. Work close to the lake or Hall Creek can fall inside a shoreline or stream buffer, so we confirm what is allowed before any clearing or grading starts.
Do I need a permit for a retaining wall in Washington?
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Generally yes above four feet, measured from the bottom of the footing rather than finished grade — which catches people out. Engineered drawings are typically required at that point too. Lower walls near property lines, slopes or critical areas can also require review.
Ready for a real number in Mountlake Terrace?
Send the address and a few photos. We walk the site for free and come back with a written quote.
