MEP Plans in Orangevale, CA

Orangevale 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	60
ADU approval timeline	Approve or deny within 60 days of a complete application (state law)

ADU building activity in Orangevale

Sacramento County issued 60 ADU building permits from 2021 through 2025 for addresses in Orangevale, based on the county's reports to the state. Permits went from 7 in 2021 to 5 in 2025.

2021	2022	2023	2024	2025
7	8	16	24	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 Orangevale

The California Energy Commission's design-day data for Orangevale gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 100°F and a winter design temperature of 24°F.

Summer design (1%)	100°F dry bulb / 70°F wet bulb
Winter design (median of extremes)	24°F
Daily temperature range	36°F
Elevation	140 ft

Cooling governs equipment size here. At 100°F design conditions, west-facing glass, attic insulation and duct location move the load more than anything else, and the heat pump's electrical load has to be carried into the panel calculation.

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.