Redmond · King County
Retaining Wall Contractor in Redmond, WA
Block and rock retaining walls in Redmond, built on a compacted base with drainage behind them, from garden walls to walls that turn a slope into usable yard. The flat Sammamish valley through downtown and Marymoor Park, with hills rising east to Education Hill and west to Overlake.
Building walls on Redmond ground
The flat Sammamish valley through downtown and Marymoor Park, with hills rising east to Education Hill and west to Overlake. That is where retaining walls earn their place in Redmond: leveling yards, widening driveways and holding back cut slopes for pads and patios.
Soft valley alluvium with high groundwater along the river, glacial till on the hills. What is under the wall decides how much base prep it needs, and poor or soft soil is replaced with compacted crushed rock before the first course goes down.
The Sammamish River, Bear Creek and Evans Creek are salmon streams with wide buffers. The valley floor has floodplain and wetland areas. Water is the number one cause of wall failure here, so every wall gets drain rock and a drain pipe behind it.
Common retaining walls projects in Redmond
Driveway and parking walls
Walls that widen or support driveways and parking pads on Downtown Redmond and Education Hill lots.
Replacing failing walls
Leaning timber, block and rock walls in Redmond removed and rebuilt with a proper base and drainage.
Garden and patio walls
Shorter block walls around Redmond patios, beds and steps.
What our retaining walls work in Redmond covers
- Block Retaining Walls
- Rock & Boulder Walls
- Wall Drainage
- Excavation & Base Prep
- Backfill & Compaction
- Old Wall Removal
Permits & Rules
Retaining wall permits in Redmond
Walls taller than about four feet, or walls supporting a driveway, building or slope, typically need an engineered design and a permit from the City of Redmond. Outside city limits, the King County Department of Local Services handles it.
On mapped steep slopes or landslide hazard areas, a geotechnical review is often required as well. We build to the approved plan.
Cost & Timing
What affects the cost of retaining walls in Redmond
We do not publish flat prices because no two Redmond sites are the same. These are the things that move the number most here.
Tight lots
Narrow side yards and alley access in Redmond mean compact equipment and shorter truck loads. We plan it so it costs less than it could.
Soft ground
Where Redmond 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 Redmond'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 Redmond jobs.
When to schedule retaining walls in Redmond
Retaining Walls in Redmond 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.
Redmond'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 Redmond'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
Retaining walls across Redmond
Redmond runs from the Sammamish River valley and downtown up onto Education Hill, Grass Lawn and the Overlake tech campuses. It mixes established neighborhoods with a lot of new construction.
We build block and rock walls across Downtown Redmond, Education Hill, Overlake, Grass Lawn, Bear Creek, Avondale and Idylwood. Mid-century and 1970s to 90s homes on Education Hill and Grass Lawn, new townhomes and apartments downtown and in Overlake.
Excavated soil is reused behind the wall where it suits, and the rest leaves on our own trucks via SR 520 and SR 202.
We also do retaining walls nearby in Kirkland, Sammamish, Bellevue and Woodinville. See everything we do in Redmond, read our full guide to retaining walls, or browse all service areas.
Why DirtRaptor
Why Redmond owners call us for retaining walls
Owner on the machine
On Redmond 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 Redmond 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 520 and SR 202, not a subcontractor's.
Permit-aware
We know Redmond has rules on trees and critical areas, and we flag what applies before any work.
How a retaining walls job runs
- 01
Plan & Permit
- 02
Excavate & Build the Base
- 03
Build With Drainage
- 04
Backfill & Finish Grade
Real Jobs
Recent DirtRaptor work near Redmond
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
Retaining Wall Contractor in Redmond: FAQs
Do I need a permit for a retaining wall in Redmond?
+
Walls over about four feet, or walls holding up a driveway or slope, usually need engineering and a permit from the City of Redmond. Shorter landscape walls usually do not.
What kind of walls work best in Redmond?
+
Block walls suit yards, patios and driveways; rock and boulder walls suit wooded and rural properties. Either way, the base and drainage matter more than the face.
Why do retaining walls fail?
+
Most fail from water pressure behind the wall or a base that settles. The Sammamish River, Bear Creek and Evans Creek are salmon streams with wide buffers. Drainage and a compacted base prevent both.
How much does retaining walls cost in Redmond?
+
It depends on the site, so we quote after a free site walk rather than guessing on the phone. The biggest drivers in Redmond 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 retaining walls in Redmond?
+
Retaining Walls in Redmond 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.
What counts as a landmark tree in Redmond?
+
Redmond gives very large trees extra protection, and removing one usually needs city approval and replacement. We measure and identify the tree on the site walk and tell you what applies.
Can you fix drainage on my Education Hill property?
+
Yes. Most Education Hill drainage problems come from water perching on glacial till. Regrading and properly placed drains carry it away from the house.
How long does a retaining wall take to build?
+
A typical residential wall takes a few days to a couple of weeks depending on length, height, access and whether engineering is involved. We give a realistic window with the quote.
Ready for a real number in Redmond?
Send the address and a few photos. We walk the site for free and come back with a written quote.
