Mill Valley, CA solar installation & market data
Updated April 16, 2026 By The SolarDNA Data Team
Mill Valley has 2,538 solar installations across 2 zip codes at a median installed cost of $5.12/W, installations up 19.2% over the trailing twelve months, and an installs-weighted Market Score of 49.
Active installations
2,538
Zip markets
2
Median cost
$5.12/W
12-mo growth
▲ 19.2%
Installers active
288
City Market Score
Great · installs-weighted across 2 zips
Best zip in Mill Valley scores higher than 84% of U.S. zip markets.
Versus California
How Mill Valley compares with the state
Installed cost
$0.86/W above
state median $4.26/W
Market score
49 vs 53
California scores 53
Share of state installs
0.11%
of 2.3M tracked statewide
Battery attach
20.0%
state 12.7%
Statewide momentum
▲ 1.1%
residential solar added in California, 12 months through Jul 2026
Statewide market
2.3M systems
30.9% of homes · utility-reported through Jul 2026
Next-12-month outlook: 141–173 installs (midpoint 157)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±10% band. Not a forecast of permits or policy.
Growth & pricing
Mill Valley by year
143 installs in the trailing twelve months vs 120 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Mill Valley
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 525 | 8 | 1 | $5.10 |
| 2 | SUN FIRST | 208 | 8 | 1 | $5.76 |
| 3 | SOLARCRAFT SERVICES | 181 | 20 | 2 | $5.38 |
| 4 | SUNRUN | 116 | 13 | 1 | $4.88 |
| 5 | SUNPOWER | 75 | 4 | 1 | $4.89 |
| 6 | PAC SOLAR | 71 | 0 | 1 | $3.16 |
| 7 | SPG SOLAR | 65 | 0 | 2 | $7.49 |
| 8 | SEMPER SOLARIS | 61 | 0 | 1 | $6.37 |
| 9 | RGS ENERGY | 55 | 0 | 1 | $7.80 |
| 10 | ROCKIN ROOFERS | 42 | 7 | 1 | $4.43 |
| 11 | AMERICAN SOLAR | 42 | 0 | 1 | $6.27 |
| 12 | NORTHERN PACIFIC POWER | 41 | 0 | 1 | $4.49 |
| 13 | AMERICAN SOLAR DIRECT | 40 | 0 | 1 | $4.08 |
| 14 | SOLARCRAFT | 31 | 0 | 1 | $3.93 |
| 15 | EARTHWISE ENERGY SOLUTIONS | 29 | 7 | 1 | $6.59 |
| 16 | SUNGEVITY | 28 | 0 | 1 | $6.29 |
| 17 | LUMINALT ENERGY | 27 | 0 | 1 | $6.95 |
| 18 | PETERSENDEAN | 25 | 0 | 1 | $4.32 |
| 19 | SUNRISE SOLAR | 20 | 1 | 1 | $3.85 |
| 20 | CITADEL ROOFING AND SOLAR | 19 | 0 | 1 | $4.75 |
| 21 | NEXUS ENERGY SYSTEMS | 18 | 1 | 1 | $4.22 |
| 22 | BETTER EARTH | 18 | 0 | 1 | $4.49 |
| 23 | SOLAR OPTIMUM DESIGN ELECTRIC | 17 | 0 | 1 | $2.86 |
| 24 | MARIN SOLAR | 16 | 0 | 1 | $8.26 |
| 25 | SWELL CONTRACTORS | 15 | 0 | 1 | $7.06 |