MEP Plans in Hollister, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Hollister, prepared for plan check at the City of Hollister building department, with Title 24 available in the same order.
Hollister project facts we design around
| County | San Benito County |
|---|---|
| Title 24 climate zone | Climate Zone 4, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permit review | The City of Hollister building department |
| ADU permits issued, 2021–2025 | 74 (#261 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Hollister
Hollister issued 74 ADU building permits from 2021 through 2025, the 261st most among the 450 California cities that reported ADU permits. Permits went from 12 in 2021 to 18 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 12 | 13 | 12 | 19 | 18 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 4
- 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 0.586) / 1000 + 1.21; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 1,007 sq ft or smaller.
Climate Zone 4 requirements in full →
HVAC design for Hollister
The California Energy Commission's design-day data for Hollister gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 87°F and a winter design temperature of 21°F.
| Summer design (1%) | 87°F dry bulb / 67°F wet bulb |
|---|---|
| Winter design (median of extremes) | 21°F |
| Daily temperature range | 30°F |
| Elevation | 280 ft |
| Heating degree days | 2,725 |
Both seasons matter here. The heat pump is usually sized for the 87°F cooling condition and then checked to confirm it still covers the heating load at 21°F.
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.
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 |
|---|---|---|---|
| San Juan Bautista | CZ 4 | Pacific Gas and Electric (PG&E) | 10 |
| Long Beach | CZ 6, 8 | Southern California Edison (SCE) | 3,015 |
| Torrance | CZ 6, 8 | Southern California Edison (SCE) | 1,051 |
| Santa Monica | CZ 6 | Southern California Edison (SCE) | 620 |
| Huntington Beach | CZ 6 | Southern California Edison (SCE) | 437 |
San Benito County → · All California cities and communities →
Guides for Hollister projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Hollister; requirements vary by project. Confirm with the City of Hollister building department.