MEP Plans in Crestline, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Crestline (unincorporated San Bernardino County), prepared for plan check at San Bernardino County Land Use Services – Building & Safety, with Title 24 available in the same order.
Crestline project facts we design around
| County | San Bernardino County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 16, confirmed by ZIP for every project |
| Electric utility (most addresses) | Southern California Edison (SCE) |
| Permits issued by | San Bernardino County Land Use Services – Building & Safety |
| ADU permits issued, 2021–2025 | 6 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Crestline
San Bernardino County issued 6 ADU building permits from 2021 through 2025 for addresses in Crestline, based on the county's reports to the state. Permits went from 3 in 2022 to 2 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | 3 | 1 | not reported | 2 |
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 Crestline
The California Energy Commission's design-day data for Crestline gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 85°F and a winter design temperature of 13°F.
| Summer design (1%) | 85°F dry bulb / 61°F wet bulb |
|---|---|
| Winter design (median of extremes) | 13°F |
| Daily temperature range | 26°F |
| Elevation | 4,900 ft |
| Heating degree days | 3,200 |
Heating governs here. Choose a cold-climate heat pump that keeps its rated capacity near 13°F, and protect water lines and the water heater from freezing.
Electrical service from Southern California Edison (SCE)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Southern California Edison (SCE) handles that through its Building, Renovation, and Project Planning Portal, separately from the building permit.
ADU electrical service with Southern California Edison (SCE) →
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 |
|---|---|---|---|
| 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 Crestline projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Crestline; requirements vary by project. Confirm with San Bernardino County Land Use Services – Building & Safety.