MEP Plans in Penryn, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Penryn (unincorporated Placer County), prepared for plan check at Placer County Building Services Division, with Title 24 available in the same order.
Penryn project facts we design around
| County | Placer County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 11, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permits issued by | Placer County Building Services Division |
| ADU permits issued, 2021–2025 | 29 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Penryn
Placer County issued 29 ADU building permits from 2021 through 2025 for addresses in Penryn, based on the county's reports to the state. Permits went from 10 in 2021 to 7 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 10 | 3 | 5 | 4 | 7 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 11
- Windows: U-factor 0.27 or lower and solar heat gain coefficient (SHGC) 0.23 or lower, with total window area up to 20% of floor area (west-facing up to 5%).
- Whole-house fan required (at least 1.5 cfm per square foot of floor area); units of 500 sq ft or less are exempt.
- Cool roof required: steep-sloped roofs need aged solar reflectance 0.2 or higher and thermal emittance 0.75 or higher.
- Solar PV sized by the CEC formula kW = (floor area x 0.836) / 1000 + 1.44; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 431 sq ft or smaller.
Climate Zone 11 requirements in full →
HVAC design for Penryn
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 11's Central Valley-style climate — hot summers, cool winters. Heat pump sized for cooling and verified for winter heating.
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 |
|---|---|---|---|
| Granite Bay (unincorp.) | CZ 11 | Pacific Gas and Electric (PG&E) | 131 |
| Roseville | CZ 11 | Roseville Electric Utility | 128 |
| Auburn | CZ 11 | Pacific Gas and Electric (PG&E) | 105 |
| Rocklin | CZ 11 | Pacific Gas and Electric (PG&E) | 76 |
| Lincoln | CZ 11 | Pacific Gas and Electric (PG&E) | 46 |
| Loomis | CZ 11 | Pacific Gas and Electric (PG&E) | 46 |
Guides for Penryn projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Penryn; requirements vary by project. Confirm with Placer County Building Services Division.