Backup Generator Installation Cost in Mill Valley, CA
Based on 104 backup generator installation building permits filed in Mill Valley between 2015 and 2025, the typical declared project value is $14,280, with most landing between $10,000 and $17,012. These are real records from Mill Valley's public building-permit data, declared job values, not contractor estimates or AI guesses.
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Backup Generator Installation values over time in Mill Valley
Median declared value moved from $11,745 in 2019 to $14,475 in 2021, up 23% over that span. Each year below is computed from the filings that actually cleared in Mill Valley.
Recent backup generator installation permits in Mill Valley
Actual filings from Mill Valley's public permit records. Declared job values, not final paid prices.
| Filed | Declared value | Work described |
|---|---|---|
| 2025-09-26 | $5,000 | Backup generator installation. |
| 2025-03-27 | $2,611 | Install generator interlock, Main panel GE 125A .Generator breaker 50 or 30A Need to insta |
| 2025-01-17 | $10,000 | Installation of a 14kW natural gas emergency back up generator with one transfer switch |
| 2024-12-13 | $16,104 | 18kW generator and 100A ATS |
| 2024-09-27 | $12,000 | Install 22kw whole home generator & 200A transfer switch. Run a dedicated gas line from PG |
| 2024-03-14 | $8,000 | Install new 16kw Generac generator and automatic transfer switch. Adding dedicated gas lin |
| 2024-03-11 | $10,000 | Installation of (1) 10KW Generac Generator and (1) 200A ATS. No new loads whatsoever |
| 2024-03-08 | $10,000 | Installation of (1) 10KW Generac Generator and (1) 200A ATS. No new loads whatsoever. |
| 2023-12-05 | $18,833 | Provide and install 16kW Generac generator, 100A disco, and 100A ATS. |
| 2023-12-01 | $17,000 | Install new 26KW Generac whole home generator. 200a transfer switch |
| 2023-09-05 | $13,892 | 10KW stationary natural gas generator w/ automatic start. |
| 2023-05-18 | $17,000 | Install stand by whole home back up generator |
| 2023-05-10 | $20,809 | Provide and install 22kW ground-mounted backup generator (Generac Guardian air cooled) and |
| 2023-03-10 | $15,000 | Installation of an 18kW natural gas-powered residential backup generator |
| 2022-11-01 | $16,260 | Provide and install 22KW generator AND ATS. |
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Add your price →How to read these numbers
A permit's declared value is the job cost the owner or contractor stated when they pulled the permit. It tracks the real cost of the work but can run a bit under what was actually paid, since it often leaves out some labor and finish costs. Treat the range as a grounded starting point. What backup generator installation actually costs in Mill Valley comes down to home size, materials, and scope.
Where this comes from
Every figure is pulled from Mill Valley's public building-permit records and classified by the work described. Nothing is estimated or AI-generated. How the data works. The moment a Mill Valley homeowner adds a real receipt, this page upgrades to show what neighbors actually paid next to these permit values.
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