MEP Plans in Ukiah, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Ukiah, prepared for plan check at the City of Ukiah building department, with Title 24 available in the same order.
Ukiah project facts we design around
| County | Mendocino County |
|---|---|
| Title 24 climate zone | Climate Zone 2, confirmed by ZIP for every project |
| Electric utility (most addresses) | City of Ukiah Electric Utility |
| Permit review | The City of Ukiah building department |
| ADU permits issued, 2021–2025 | 41 (#316 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Ukiah
Ukiah issued 41 ADU building permits from 2021 through 2025, the 316th most among the 450 California cities that reported ADU permits. Permits went from 8 in 2021 to 4 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 8 | 11 | 10 | 8 | 4 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 2
- 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 0.621) / 1000 + 1.22; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 934 sq ft or smaller.
Climate Zone 2 requirements in full →
HVAC design for Ukiah
The California Energy Commission's design-day data for Ukiah gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 96°F and a winter design temperature of 22°F.
| Summer design (1%) | 96°F dry bulb / 69°F wet bulb |
|---|---|
| Winter design (median of extremes) | 22°F |
| Daily temperature range | 42°F |
| Elevation | 623 ft |
| Heating degree days | 2,958 |
Both seasons matter here. The heat pump is usually sized for the 96°F cooling condition and then checked to confirm it still covers the heating load at 22°F.
Electrical service from City of Ukiah Electric Utility
If the load calculation shows you need a service upgrade, a second meter or a relocated service, open that request with City of Ukiah Electric Utility early; utility lead times are often longer than plan check.
Plumbing and sewer
The plumbing plan shows the route, slope and cleanouts of the connection to the existing sewer lateral.
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 |
|---|---|---|---|
| Fort Bragg | CZ 1 | Pacific Gas and Electric (PG&E) | 41 |
| Mendocino (unincorp.) | CZ 1 | Pacific Gas and Electric (PG&E) | 23 |
| Willits | CZ 2 | Pacific Gas and Electric (PG&E) | 15 |
| Redwood Valley (unincorp.) | CZ 2 | Pacific Gas and Electric (PG&E) | 12 |
| Hopland (unincorp.) | CZ 2 | Pacific Gas and Electric (PG&E) | 10 |
| Boonville (unincorp.) | CZ 2 | Pacific Gas and Electric (PG&E) | 6 |
Mendocino County → · All California cities and communities →
Guides for Ukiah projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Ukiah; requirements vary by project. Confirm with the City of Ukiah building department.