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Retaining Walls & Rockeries in Seattle

A retaining wall is the one piece of landscaping that is doing structural work every day of its life. It is holding back soil that wants to move, and in a city that takes 38 inches of rain a year, most of it between October and March, the thing that decides whether it holds is not the block you can see. It is the drainage behind it. Walls in Seattle fail because water builds up in saturated soil and pushes — not because the units were wrong. We build the drainage first: perforated pipe at the footing, at least twelve inches of clean free-draining rock behind the face, and a route to daylight or an approved drain. The visible wall goes on top of that.

Typical range
$5–$45 per square foot of wall face
Best season
Buildable most of the year, but base work in a wet February is slower and messier than in June.
Payment
No deposit — you pay when the project is finished

Two-tier block retaining wall with stone steps and new planting on a sloped side yard

What is included

Hold the slope. Get the yard back.

Turn an unusable bank into flat, usable ground.

  • Interlocking block

    The workhorse. Fast to build, predictable to engineer, and available in enough finishes that it no longer looks like a car park. Best value per foot of height.

  • Poured concrete

    Where a wall has to be thin, tall, or carry something. Costs more and takes longer, but gets you height in a narrow footprint that block cannot match.

  • Natural rock and rockeries

    Stacked boulder walls, which are a genuinely Seattle idiom — half the older walls in the north end are rockeries. We build new ones and rebuild failing ones.

  • Terracing

    Two or three shorter walls stepping down a slope instead of one tall one. Usually cheaper, always more usable, and on a view lot it keeps the sightline that one tall wall would take.

  • Sitting walls and garden walls

    Low walls that define a patio edge or a bed. Not structural in the same sense, but they use the same base and the same drainage thinking.

Why people call us

The problems this actually fixes.

  • A bank too steep to plant, mow or walk on, taking up a third of the garden
  • An old rockery bulging, leaning or shedding stone
  • A wall built with no drainage that moves a little more every winter
  • Erosion carrying soil onto a patio or driveway after heavy rain
  • A neighbouring property's grade pushing onto yours
  • A slope that makes the only flat ground the bit right next to the house

How we build it

6 stages, and the visible one is last.

Two-tier block retaining wall with stone steps and new planting on a sloped side yard

Seasonality. Buildable most of the year, but base work in a wet February is slower and messier than in June. Wall failures reveal themselves in winter, so most enquiries arrive between November and March for work in spring.

  1. 01

    Check the parcel before quoting

    We look up whether the property sits in an Environmentally Critical Area and what the grade actually is, because that decides the permit position before it decides anything else.

  2. 02

    Excavate and cut the base

    A level, compacted base trench below finished grade. This is the step that gets rushed on a cheap job and it is the step that determines whether the wall stays straight.

  3. 03

    Set the base course

    Levelled unit by unit. Every course above copies the first one, so an error here multiplies all the way up.

  4. 04

    Build the drainage as you build the wall

    Perforated pipe at the footing, clean rock backfill placed course by course rather than dumped at the end, and geotextile separating rock from soil so it does not silt up.

  5. 05

    Backfill and compact in lifts

    Compacted in layers, not filled in one go. Settled backfill is what pulls a wall out of line a year later.

  6. 06

    Cap and finish

    Capping units, any planting above, and the ground reinstated so the wall reads as part of the garden rather than an intervention.

What it costs

$5–$45 per square foot of wall face

A four-foot by fifty-foot wall with proper drainage and reasonable access typically lands between $8,000 and $24,000. The spread is that wide because access, height, material and whether the ground needs shoring change the job completely.

That is a market range, not a quote. Your price is fixed in writing after we have seen the site, and it does not move once agreed.

  • No down payment

    No deposit is required to start. Payment comes after the work is finished — not before.

  • Fixed price, agreed up front

    A fixed, accurate price is guaranteed before the job starts. We do not quote low and raise it mid-project.

  • 0% interest for up to 6 months

    A 0% interest payment plan is available for up to 6 months.

  • Warranty on hardscaping

    Hardscaping work carries a warranty. Vegetation is excluded.

Retaining Walls we have built

34 of ours, photographed on site.

In their words

What customers said about our retaining walls work

Real Google reviews, unedited. We publish the ones that name the work rather than a generic five stars.

Marina Savca

June 2026

Very happy with our new retaining wall. Alex was reliable and easy to work with.
Retaining wall

Yony Cortez

July 2025

They're the best landscapers in Seattle. Hired them for my house near Queen Anne and they did exactly what I asked them to do. They did retaining walls and landscape design for me. I loved every detail.
Retaining walls — Queen Anne

Aidar Bariev

April 2025

Alex is one of the best contractors I've worked with! He's very creative and really sweats the details, which shows in the final product. Our backyard turned out very functional and beautiful!
Retaining walls on a steep lot

Aigul B

August 2024

We could not be happier with the patio cover, retaining wall and new turf that Aden landscaping put up for us Alex and his entire team were incredible, and we are very impressed and thankful.
Patio cover, wall & turf

Egle Garcia

April 2014

We needed a solution with the sliding soil in our backyard (Seattle location). Eric & Alex suggested building a retaining wall and we are very satisfied with the solution and the results.
Retaining wall for slipping soil — Seattle

Before you call

Retaining Walls questions we get asked.

Something not answered here? Call (425) 533-9734 and ask — we would rather talk it through than have you guess.

Do I need a permit for a retaining wall in Seattle?

A wall is exempt from a construction permit only if all three of these are true: it is four feet or lower measured from the bottom of the footing to the top of the wall, it is not in an Environmentally Critical Area, and it causes no damage to adjoining property. Fail any one and you need a permit. The measurement catches people out — it is from the footing, not from the ground you can see, so a wall that looks three feet tall can easily be over four. We check the parcel and measure properly before quoting.

Why do retaining walls fail, and how do you stop it?

Water, in almost every case. Soil behind a wall saturates through the winter, and saturated soil weighs far more and pushes far harder than dry soil. A wall built to hold dry soil and given nowhere to drain will lean, bulge and eventually come apart. The prevention is drainage built in as the wall goes up: perforated pipe sitting at the footing, twelve or more inches of clean free-draining rock directly behind the face, geotextile keeping soil out of that rock, and a discharge route to daylight or an approved drain. None of it is visible when the job is finished, which is exactly why it is the first thing cut from a cheap quote.

What is a rockery, and can you repair an old one?

A rockery is a wall built from stacked natural boulders rather than manufactured units, and they are a Seattle speciality — a large share of the walls in the north end and on the older hillside streets are rockeries built decades ago. They fail differently from block walls: individual stones work loose, the face bulges where soil has washed through the gaps, and the toe spreads. We repair and rebuild them, and the honest answer on any given wall is that sometimes resetting the failing section is enough and sometimes the whole run has moved too far to be worth patching. We tell you which before quoting.

Should I build one tall wall or terrace the slope?

Terrace it, in most cases. Two four-foot walls set apart usually cost less than one eight-foot wall, because the taller wall needs engineering, deeper footings and often a permit that the shorter pair avoid. Terracing also gives you planting space between the levels and usable ground rather than a single cliff face. The one case for going tall is where horizontal space is genuinely too tight to step back — a narrow side return, or a boundary you cannot build into.

Can you build a wall on a steep slope in an Environmentally Critical Area?

Often yes, but the process is different and it takes longer. Seattle defines a steep slope as 40% or more grade over ten feet of vertical change, and applies fifteen-foot buffers at both the top and the toe. Inside an ECA the four-foot exemption does not apply, so a wall of any height may need a permit, and depending on the situation the design may need engineering input. This is common work on the West Seattle bluff, in Magnolia and through Leschi and Madrona. What we will not do is build it as though the designation is not there and leave you with the problem.

Landscape lighting washing a retaining wall above a lit patio at dusk

Get a free wall assessment.

We come out, look at the site properly, and put a fixed written price together. No deposit, and nothing changes once the price is agreed.

Usually done alongside

What tends to go with retaining walls.

Excavator regrading a yard for drainage before landscape construction

Drainage & French Drains

A yard that drains through a Seattle winter instead of holding it.

  • French drains
  • Catch basins
  • Regrading for runoff

$10–$25 per linear foot

Natural stone veneer retaining wall under construction with tools and materials on site

Brick & Stone Masonry

Walls, columns, steps and veneers built to last generations.

  • Natural stone veneer
  • Brickwork
  • Columns & pillars

$45–$120 per square foot of finished face

Light grey paver walkway with a charcoal border course under installation, edge restraint pinned along both sides

Pathways & Walkways

Get from the street to the door, and around the house, without mud.

  • Paver walkways
  • Flagstone paths
  • Stepping stones

$18–$45 per square foot installed

Newly completed landscape with a grey paver patio, charcoal edging walls, turf lawn and freshly planted boxwood beds

Landscape Design & Installation

A yard designed as one thing, not six jobs stitched together.

  • Custom design plans
  • Planting & beds
  • Full yard renovation

$8,000–$70,000 for a full design and installation

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Free estimate

Tell us about the project.

Three minutes on the form. We reply during office hours — Monday – Friday, 9:00 AM – 7:00 PM.

Or call (425) 533-9734

Takes under a minute. No deposit is required to book work — you pay when the project is finished. Prefer to talk? Call (425) 533-9734

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