MEP Plans in Healdsburg, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Healdsburg, prepared for plan check at the City of Healdsburg building department, with Title 24 available in the same order.
Healdsburg project facts we design around
| County | Sonoma County |
|---|---|
| Title 24 climate zone | Climate Zone 2, confirmed by ZIP for every project |
| Electric utility (most addresses) | City of Healdsburg Electric Utility |
| Permit review | The City of Healdsburg building department |
| ADU permits issued, 2021–2025 | 48 (#298 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Healdsburg
Healdsburg issued 48 ADU building permits from 2021 through 2025, the 298th most among the 450 California cities that reported ADU permits. Permits went from 1 in 2021 to 19 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 1 | 11 | 5 | 12 | 19 |
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 Healdsburg
The California Energy Commission's design-day data for Healdsburg gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 94°F and a winter design temperature of 26°F.
| Summer design (1%) | 94°F dry bulb / 68°F wet bulb |
|---|---|
| Winter design (median of extremes) | 26°F |
| Daily temperature range | 37°F |
| Elevation | 102 ft |
| Heating degree days | 2,572 |
Both seasons matter here. The heat pump is usually sized for the 94°F cooling condition and then checked to confirm it still covers the heating load at 26°F.
Electrical service from City of Healdsburg 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 Healdsburg 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 |
|---|---|---|---|
| Santa Rosa | CZ 2 | Pacific Gas and Electric (PG&E) | 497 |
| Petaluma | CZ 2 | Pacific Gas and Electric (PG&E) | 124 |
| Sebastopol | CZ 2 | Pacific Gas and Electric (PG&E) | 61 |
| Sonoma | CZ 2 | Pacific Gas and Electric (PG&E) | 57 |
| Windsor | CZ 2 | Pacific Gas and Electric (PG&E) | 49 |
| Rohnert Park | CZ 2 | Pacific Gas and Electric (PG&E) | 43 |
Guides for Healdsburg projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Healdsburg; requirements vary by project. Confirm with the City of Healdsburg building department.