MEP Plans in Mariposa, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Mariposa (unincorporated Mariposa County), prepared for plan check at Mariposa County Building Department, with Title 24 available in the same order.
Mariposa project facts we design around
| County | Mariposa County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 12, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permits issued by | Mariposa County Building Department |
| ADU permits issued, 2021–2025 | 57 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Mariposa
Mariposa County issued 57 ADU building permits from 2021 through 2025 for addresses in Mariposa, based on the county's reports to the state. Permits went from 4 in 2021 to 5 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 4 | 12 | 20 | 16 | 5 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 12
- 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 0.613) / 1000 + 1.4; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 653 sq ft or smaller.
Climate Zone 12 requirements in full →
HVAC design for Mariposa
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 12's Central Valley-style climate — hot summers, cool winters. Heat pump sized for cooling and verified for winter heating.
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 |
|---|---|---|---|
| Catheys Valley (unincorp.) | CZ 12 | Pacific Gas and Electric (PG&E) | 5 |
| Concord | CZ 12 | Pacific Gas and Electric (PG&E) | 276 |
| Antioch | CZ 12 | Pacific Gas and Electric (PG&E) | 171 |
| Fairfield | CZ 12 | Pacific Gas and Electric (PG&E) | 79 |
| Sacramento | CZ 12 | Sacramento Municipal Utility District (SMUD) | 1,720 |
Guides for Mariposa projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Mariposa; requirements vary by project. Confirm with Mariposa County Building Department.