MEP Plans in Piñon Hills, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Piñon Hills (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.
Piñon Hills project facts we design around
| County | San Bernardino County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 14 (with parts in CZ 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 | 8 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Piñon Hills
San Bernardino County issued 8 ADU building permits from 2021 through 2025 for addresses in Piñon Hills, based on the county's reports to the state. Permits went from 2 in 2021 to 1 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 2 | not reported | 1 | 4 | 1 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 14
- Windows: U-factor 0.27 or lower and solar heat gain coefficient (SHGC) 0.23 or lower, with total window area up to 20% of floor area (west-facing up to 5%).
- Whole-house fan required (at least 1.5 cfm per square foot of floor area); units of 500 sq ft or less are exempt.
- Cool roof required: steep-sloped roofs need aged solar reflectance 0.2 or higher and thermal emittance 0.75 or higher.
- Solar PV sized by the CEC formula kW = (floor area x 0.741) / 1000 + 1.26; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 729 sq ft or smaller.
Climate Zone 14 requirements in full →
HVAC design for Piñon Hills
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 14's high-desert / desert climate with extreme summer heat. Cooling capacity and equipment rated for high outdoor temperatures.
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 Piñon Hills projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Piñon Hills; requirements vary by project. Confirm with San Bernardino County Land Use Services – Building & Safety.