MEP Plans in Occidental, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Occidental (unincorporated Sonoma County), prepared for plan check at Permit Sonoma, with Title 24 available in the same order.
Occidental project facts we design around
| County | Sonoma County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 1 (with parts in CZ 2), confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permits issued by | Permit Sonoma |
| ADU permits issued, 2021–2025 | 5 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Occidental
Sonoma County issued 5 ADU building permits from 2021 through 2025 for addresses in Occidental, based on the county's reports to the state. Permits went from 2 in 2021 to 1 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 2 | 1 | not reported | 1 | 1 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 1
- Windows: U-factor 0.27 or lower (no SHGC limit in this zone), with total window area up to 20% of floor area.
- Solar PV sized by the CEC formula kW = (floor area x 0.793) / 1000 + 1.27; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 668 sq ft or smaller.
Climate Zone 1 requirements in full →
HVAC design for Occidental
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 1's coastal, marine-influenced climate. Right-size the heat pump from a real Manual J instead of a tonnage guess.
Electrical service from Pacific Gas and Electric (PG&E)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Pacific Gas and Electric (PG&E) handles that through its Your Projects portal, separately from the building permit.
ADU electrical service with Pacific Gas and Electric (PG&E) →
Plumbing and sewer
The plumbing plan shows the route, slope and cleanouts of the connection to the existing sewer lateral or septic system.
Pricing is flat statewide: ADU plans from $995, full ADU MEP package from $2,295, Title 24 add-on $240. See what's in a complete ADU MEP set.
Nearby places compared
| Place | Climate zone | Electric utility | ADU permits 2021–25 |
|---|---|---|---|
| Santa Rosa | CZ 2 | Pacific Gas and Electric (PG&E) | 497 |
| Petaluma | CZ 2 | Pacific Gas and Electric (PG&E) | 124 |
| Sebastopol | CZ 2 | Pacific Gas and Electric (PG&E) | 61 |
| Sonoma | CZ 2 | Pacific Gas and Electric (PG&E) | 57 |
| Windsor | CZ 2 | Pacific Gas and Electric (PG&E) | 49 |
| Healdsburg | CZ 2 | City of Healdsburg Electric Utility | 48 |
Guides for Occidental projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Occidental; requirements vary by project. Confirm with Permit Sonoma.