MEP Plans in Midway City, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Midway City (unincorporated Orange County), prepared for plan check at OC Public Works – OC Development Services, Building & Safety, with Title 24 available in the same order.
Midway City project facts we design around
| County | Orange County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 6, confirmed by ZIP for every project |
| Electric utility (most addresses) | Southern California Edison (SCE) |
| Permits issued by | OC Public Works – OC Development Services, Building & Safety |
| ADU permits issued, 2021–2025 | 43 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Midway City
Orange County issued 43 ADU building permits from 2021 through 2025 for addresses in Midway City, based on the county's reports to the state. Permits went from 4 in 2022 to 16 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | 4 | 14 | 9 | 16 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 6
- Windows: U-factor 0.30 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 0.594) / 1000 + 1.23; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 960 sq ft or smaller.
Climate Zone 6 requirements in full →
HVAC design for Midway City
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 6's coastal, marine-influenced climate. Right-size the heat pump from a real Manual J instead of a tonnage guess.
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 |
|---|---|---|---|
| Fullerton | CZ 8 | Southern California Edison (SCE) | 2,171 |
| Garden Grove | CZ 8, 6 | Southern California Edison (SCE) | 2,046 |
| Anaheim | CZ 8 | Anaheim Public Utilities | 1,713 |
| Santa Ana | CZ 8 | Southern California Edison (SCE) | 956 |
| Westminster | CZ 6 | Southern California Edison (SCE) | 908 |
| Huntington Beach | CZ 6 | Southern California Edison (SCE) | 437 |
Guides for Midway City projects
Ready for permit-ready MEP plans in Midway City?
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Midway City; requirements vary by project. Confirm with OC Public Works – OC Development Services, Building & Safety.