MEP Plans in Wilton, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Wilton (unincorporated Sacramento County), prepared for plan check at Sacramento County Community Development – Building Permits & Inspection Division, with Title 24 available in the same order.
Wilton project facts we design around
| County | Sacramento County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 12, confirmed by ZIP for every project |
| Electric utility (most addresses) | Sacramento Municipal Utility District (SMUD) |
| Permits issued by | Sacramento County Community Development – Building Permits & Inspection Division |
| ADU permits issued, 2021–2025 | 24 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Wilton
Sacramento County issued 24 ADU building permits from 2021 through 2025 for addresses in Wilton, based on the county's reports to the state. Permits went from 4 in 2021 to 2 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 4 | 10 | 4 | 4 | 2 |
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 Wilton
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 Sacramento Municipal Utility District (SMUD)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Sacramento Municipal Utility District (SMUD) handles that through its Design & Construction Services, separately from the building permit.
ADU electrical service with Sacramento Municipal Utility District (SMUD) →
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 |
|---|---|---|---|
| Sacramento | CZ 12 | Sacramento Municipal Utility District (SMUD) | 1,720 |
| Folsom | CZ 12 | Sacramento Municipal Utility District (SMUD) | 189 |
| Citrus Heights | CZ 12 | Sacramento Municipal Utility District (SMUD) | 152 |
| Fair Oaks (unincorp.) | CZ 12 | Sacramento Municipal Utility District (SMUD) | 64 |
| Orangevale (unincorp.) | CZ 12 | Sacramento Municipal Utility District (SMUD) | 60 |
| Carmichael (unincorp.) | CZ 12 | Sacramento Municipal Utility District (SMUD) | 58 |
Sacramento County → · All California cities and communities →
Guides for Wilton projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Wilton; requirements vary by project. Confirm with Sacramento County Community Development – Building Permits & Inspection Division.