Looking for a retaining wall contractor in Mill Valley, CA? Describe your project once and up to three retaining wall contractors who work in Mill Valley and Marin County get back to you with a quote. It's free and there is no obligation.
Mill Valley is home to about 13,904 people (2024 Census Bureau estimate), a shrinking community (−2.3% since 2020). With 2,907 people per sq mi, it is a suburban area. Sloped lots, terraced yards and driveways cut into hillsides keep local wall builders busy.
Mill Valley at a glance
- Population (Census Bureau estimate, 2024)
- 13,904 (−2.3% since 2020)
- Rank in California
- 335th of 482 cities and towns
- Land area
- 4.8 sq mi
- Population density
- 2,907 people per sq mi (suburban)
- Type
- City (Mill Valley city)
- Main county
- Marin County
What to check before hiring in Mill Valley
- Permit and engineer: in California, taller walls or walls with loads above usually need an engineered design and a permit.
- Drainage: ask how water behind the wall will be drained.
- Property line: a survey avoids building on the neighbor's land.
- Price drivers: height, length, material, access and drainage.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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Call 811
Official information and guidance.
Services available in Mill Valley
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Retaining wall construction
Design and construction of a new retaining wall with drainage.
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Retaining wall repair or replacement
Assessment and repair or replacement of a leaning, bulging or cracked wall.
Frequently asked questions in Mill Valley
How much does a retaining wall cost in Mill Valley, CA?
It depends on height, length, material and access. Describe your project: contractors who serve Mill Valley reply with a quote.
How long does it take?
A small wall can take a few days; engineered walls take longer with permits.
Can a failing wall be repaired?
Sometimes; often a leaning wall must be rebuilt with proper drainage.
Which retaining wall contractors will contact me?
Up to three independent retaining wall contractors who serve Mill Valley and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.