MEP Plans in Big Bear Lake, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Big Bear Lake, prepared for plan check at the City of Big Bear Lake building department, with Title 24 available in the same order.
Big Bear Lake project facts we design around
| County | San Bernardino County |
|---|---|
| Title 24 climate zone | Climate Zone 16, confirmed by ZIP for every project |
| Electric utility (most addresses) | Bear Valley Electric Service |
| Permit review | The City of Big Bear Lake building department |
| ADU permits issued, 2021–2025 | 23 (#348 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Big Bear Lake
Big Bear Lake issued 23 ADU building permits from 2021 through 2025, the 348th most among the 450 California cities that reported ADU permits. Permits went from 9 in 2021 to 12 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 9 | not reported | not reported | 2 | 12 |
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 Big Bear Lake
The California Energy Commission's design-day data for Big Bear Lake gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 82°F and a winter design temperature of -3°F.
| Summer design (1%) | 82°F dry bulb / 58°F wet bulb |
|---|---|
| Winter design (median of extremes) | -3°F |
| Daily temperature range | 32°F |
| Elevation | 6,745 ft |
| Heating degree days | 6,850 |
Heating governs here. Choose a cold-climate heat pump that keeps its rated capacity near -3°F, and protect water lines and the water heater from freezing.
Electrical service from Bear Valley Electric Service
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Bear Valley Electric Service handles that through its Preliminary Service Request process, separately from the building permit.
ADU electrical service with Bear Valley Electric Service →
Plumbing and sewer
The plumbing plan shows the route, slope and cleanouts of the connection to the existing sewer lateral.
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 |
|---|---|---|---|
| San Bernardino | CZ 10, 16 | Southern California Edison (SCE) | 854 |
| Fontana | CZ 10 | Southern California Edison (SCE) | 754 |
| Ontario | CZ 10 | Southern California Edison (SCE) | 563 |
| Rancho Cucamonga | CZ 10 | Southern California Edison (SCE) | 316 |
| Upland | CZ 10 | Southern California Edison (SCE) | 285 |
| Chino | CZ 10 | Southern California Edison (SCE) | 269 |
San Bernardino County → · All California cities and communities →
Guides for Big Bear Lake projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Big Bear Lake; requirements vary by project. Confirm with the City of Big Bear Lake building department.