MEP Plans in Creston, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Creston (unincorporated San Luis Obispo County), prepared for plan check at San Luis Obispo County Department of Planning & Building, with Title 24 available in the same order.
Creston project facts we design around
| County | San Luis Obispo County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 4, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permits issued by | San Luis Obispo County Department of Planning & Building |
| 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 Creston
San Luis Obispo County issued 5 ADU building permits from 2021 through 2025 for addresses in Creston, based on the county's reports to the state. Permits went from 1 in 2023 to 3 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | not reported | 1 | 1 | 3 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 4
- 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%).
- Solar PV sized by the CEC formula kW = (floor area x 0.586) / 1000 + 1.21; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 1,007 sq ft or smaller.
Climate Zone 4 requirements in full →
HVAC design for Creston
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 4's coastal, marine-influenced climate. Right-size the heat pump from a real Manual J instead of a tonnage guess.
Electrical service from Pacific Gas and Electric (PG&E)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Pacific Gas and Electric (PG&E) handles that through its Your Projects portal, separately from the building permit.
ADU electrical service with Pacific Gas and Electric (PG&E) →
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 Luis Obispo | CZ 5 | Pacific Gas and Electric (PG&E) | 386 |
| Grover Beach | CZ 5 | Pacific Gas and Electric (PG&E) | 257 |
| Nipomo (unincorp.) | CZ 5 | Pacific Gas and Electric (PG&E) | 109 |
| Paso Robles | CZ 4 | Pacific Gas and Electric (PG&E) | 108 |
| Atascadero | CZ 4 | Pacific Gas and Electric (PG&E) | 107 |
| Morro Bay | CZ 5 | Pacific Gas and Electric (PG&E) | 98 |
San Luis Obispo County → · All California cities and communities →
Guides for Creston projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Creston; requirements vary by project. Confirm with San Luis Obispo County Department of Planning & Building.