MEP Plans in Carnelian Bay, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Carnelian Bay (unincorporated Placer County), prepared for plan check at Placer County Building Services Division, with Title 24 available in the same order.
Carnelian Bay project facts we design around
| County | Placer County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 16 (with parts in CZ 11), confirmed by ZIP for every project |
| Electric utility (most addresses) | Liberty Utilities |
| Permits issued by | Placer County Building Services Division |
| ADU permits issued, 2021–2025 | 7 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Carnelian Bay
Placer County issued 7 ADU building permits from 2021 through 2025 for addresses in Carnelian Bay, based on the county's reports to the state. Permits went from 3 in 2021 to 3 in 2024.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 3 | 1 | not reported | 3 | not reported |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 16
- 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 0.59) / 1000 + 1.22; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 983 sq ft or smaller.
Climate Zone 16 requirements in full →
HVAC design for Carnelian Bay
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 16's mountain climate with cold, snowy winters. Cold-climate heat pump sized for the local winter design temperature.
Electrical service from Liberty Utilities
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Liberty Utilities handles that through its New Construction Service Application (PowerClerk portal), separately from the building permit.
ADU electrical service with Liberty Utilities →
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 Carnelian Bay projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Carnelian Bay; requirements vary by project. Confirm with Placer County Building Services Division.