Retaining Walls in Seattle: Planning Your Quote
Seattle ConcreteCONTRACTORS
(206) 566-0528
Need a retaining wall in Seattle? Here’s how we plan walls around slope and water, when permits and engineering apply, and typical cost ranges.
- Drain rock, pipe and outlet behind every wall
- Engineering and permits flagged early
- Steps and patios tied in where needed
Get a retaining wall quote in Seattle
Tell us about the project. We’ll call or email to talk it through.
Retaining Walls for Seattle properties
A retaining wall holds back soil and the water in it. Water is the part people underestimate. When the soil behind a wall stays saturated through a Seattle winter, the pressure on it climbs, and walls built without drainage lean, crack and eventually fail. Every wall we plan starts with where the water goes.
Craftsman bungalows, Tudors, and mid-century houses with original concrete are common, alongside new townhomes and backyard cottages (DADUs) that need new slabs and walks. We work across Ballard, Wallingford, Queen Anne, Magnolia, Capitol Hill, Beacon Hill, West Seattle, Rainier Valley, Lake City and Northgate.
Level yards
Turning a slope into usable lawn or patio space.
Driveway cuts
Holding back soil beside a driveway or parking pad.
Terraced beds
Lower walls in steps for planting.
Seattle conditions that affect your retaining wall
Slope and access
Queen Anne, Magnolia, West Seattle, Capitol Hill and the slopes above Lake Washington have steep driveways and stepped yards. Parts of the city are mapped as steep-slope or landslide-prone environmentally critical areas (ECAs), which brings extra SDCI review for grading and walls.
Soil and settling
Soils change block to block: dense glacial till on many ridges, softer fill and old wetland soils in lower areas like parts of the Duwamish valley, Interbay and around the lakes. A slab that keeps sinking usually points to a soft or wet base.
Rain and drainage
Long rainy seasons mean water management decides how long concrete lasts: slope away from the house, joints that drain, and somewhere for downspout water to go.
Details that help us price your retaining wall in Seattle
You don’t need answers to all of these. They’re the questions that shape the design and the price.
Height and length
Tallest point and rough length. Height counts from the bottom of the footing.
What’s above
A driveway, house, fence or slope above the wall adds load.
Water
Wet spots, seeps or water running down the slope in winter.
Property line
How close the wall is to a neighbor.
Existing wall
Photos of any old wall, rockery or timbers to remove.
Access
Can equipment get in, or is it hand work?
Options to talk through
| Type | Good for | Keep in mind |
|---|---|---|
| Poured concrete | Driveway cuts, taller walls, tight spots near property lines | Needs a footing, forms and cure time; can be smooth or board-formed |
| Concrete block (CMU) | Structural walls with a stone, stucco or painted face | Reinforced and grouted on a footing |
| Segmental block | Garden terraces and lower walls | Taller walls need geogrid back into the slope |
Permits for retaining walls in Seattle
In Seattle, walls taller than 4 ft measured from the bottom of the footing, walls holding back a driveway or slope, and walls in a mapped environmentally critical area generally need an SDCI permit and an engineered design. Check SDCI’s permit guide for your address.
Planning a retaining wall in Seattle?
Call to talk it through, or send a few details and photos.
What retaining walls typically cost in the Seattle area
Ballpark numbers help you plan a budget before anyone visits. Use them as a starting point, not a promise.
| Wall type | Typical range |
|---|---|
| Poured concrete, up to 4 ft | $80–$150 per linear ft |
| Poured concrete, 4–8 ft (engineered) | $150–$300+ per linear ft |
| CMU block wall | $60–$120 per linear ft |
| Segmental retaining block | $40–$90 per linear ft |
| Engineering and permit fees (walls over 4 ft) | add $2,000–$5,000 |
Typical market ranges, not a quote from Seattle Concrete Contractors. These are ranges other Seattle-area concrete contractors publish for this work (Seattle Concrete (seattleconcrete.com) service pages (another Seattle wall builder lists $30–$100 per sq ft of wall face by type), checked November 2026). Your price depends on size, access, removal, base work, finish and permits, and on conditions at your Seattle property. We give a written quote after we understand the job.
Retaining Walls in Seattle: quick answers
Do retaining walls in Seattle need a permit?
Walls taller than 4 ft from the bottom of the footing, walls holding back a driveway or slope, and walls in an ECA generally need an SDCI permit. Short garden walls often don’t.
Do I need an engineer?
For taller walls, walls with load above them, and walls in critical areas, usually yes. We’ll tell you early.
Why do retaining walls lean?
Usually water pressure behind a wall with no drainage, or a footing that’s too small for the soil.
Do I need a permit for concrete work in Seattle?
It depends on the job. SDCI generally requires a grading permit when you add or replace 750 sq ft or more of paving, and walls taller than 4 ft measured from the bottom of the footing need a permit. Anything in the sidewalk, planting strip or driveway apron is right-of-way work that goes through SDOT.
Learn more about retaining walls
See the full retaining walls guide, or all concrete services in Seattle.
More concrete services in Seattle
Tell us about your project
A few photos and rough measurements are enough to start. If you’re not sure what the job needs, describe the problem and we’ll talk it through.
Call (206) 566-0528 or use the quote form at the top of this page.
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Seattle Concrete Contractors | (206) 566-0528 | Seattle, WA