MEP Plans in Janesville, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Janesville (unincorporated Lassen County), prepared for plan check at Lassen County Planning and Building Services Department – Building Division, with Title 24 available in the same order.
Janesville project facts we design around
| County | Lassen County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 16, confirmed by ZIP for every project |
| Electric utility (most addresses) | Lassen Municipal Utility District |
| Permits issued by | Lassen County Planning and Building Services Department – Building Division |
| 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 Janesville
Lassen County issued 5 ADU building permits from 2021 through 2025 for addresses in Janesville, based on the county's reports to the state. Permits went from 3 in 2023 to 1 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | not reported | 3 | 1 | 1 |
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 Janesville
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 Lassen Municipal Utility District
If the load calculation shows you need a service upgrade, a second meter or a relocated service, open that request with Lassen Municipal Utility 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 |
|---|---|---|---|
| Susanville | CZ 16 | Lassen Municipal Utility District | 8 |
| 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 |
Guides for Janesville projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Janesville; requirements vary by project. Confirm with Lassen County Planning and Building Services Department – Building Division.