MEP Plans in Weaverville, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Weaverville (unincorporated Trinity County), prepared for plan check at Trinity County Community Development Department – Building Division, with Title 24 available in the same order.
Weaverville project facts we design around
| County | Trinity County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 16, confirmed by ZIP for every project |
| Electric utility (most addresses) | Trinity Public Utilities District |
| Permits issued by | Trinity County Community Development Department – Building 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 Weaverville
Trinity County issued 7 ADU building permits from 2021 through 2025 for addresses in Weaverville, based on the county's reports to the state. Permits went from 1 in 2021 to 6 in 2022.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 1 | 6 | not reported | not reported | 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 Weaverville
The California Energy Commission's design-day data for Weaverville gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 93°F and a winter design temperature of 10°F.
| Summer design (1%) | 93°F dry bulb / 65°F wet bulb |
|---|---|
| Winter design (median of extremes) | 10°F |
| Daily temperature range | 46°F |
| Elevation | 2,050 ft |
| Heating degree days | 4,992 |
Heating governs here. Choose a cold-climate heat pump that keeps its rated capacity near 10°F, and protect water lines and the water heater from freezing.
Electrical service from Trinity Public Utilities District
If the load calculation shows you need a service upgrade, a second meter or a relocated service, open that request with Trinity Public Utilities District early; utility lead times are often longer than plan check.
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 |
|---|---|---|---|
| South Lake Tahoe | CZ 16 | Liberty Utilities | 37 |
| Truckee | CZ 16 | Truckee Donner Public Utility District | 117 |
| Big Bear Lake | CZ 16 | Bear Valley Electric Service | 23 |
| Mammoth Lakes | CZ 16 | Southern California Edison (SCE) | 22 |
| Lake Arrowhead (unincorp.) | CZ 16 | Southern California Edison (SCE) | 17 |
Guides for Weaverville projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Weaverville; requirements vary by project. Confirm with Trinity County Community Development Department – Building Division.