MEP Plans in Monterey, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Monterey, prepared for plan check at the City of Monterey building department, with Title 24 available in the same order.
Monterey project facts we design around
| County | Monterey County |
|---|---|
| Title 24 climate zone | Climate Zone 3, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permit review | The City of Monterey building department |
| ADU permits issued, 2021–2025 | 446 (#50 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Monterey
Monterey issued 446 ADU building permits from 2021 through 2025, the 50th most among the 450 California cities that reported ADU permits. Permits went from 36 in 2021 to 144 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 36 | 63 | 82 | 121 | 144 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 3
- Windows: U-factor 0.27 or lower (no SHGC limit in this zone), with total window area up to 20% of floor area.
- Solar PV sized by the CEC formula kW = (floor area x 0.628) / 1000 + 1.12; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 1,083 sq ft or smaller.
Climate Zone 3 requirements in full →
HVAC design for Monterey
The California Energy Commission's design-day data for Monterey gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 76°F and a winter design temperature of 32°F.
| Summer design (1%) | 76°F dry bulb / 62°F wet bulb |
|---|---|
| Winter design (median of extremes) | 32°F |
| Daily temperature range | 20°F |
| Elevation | 345 ft |
| Heating degree days | 3,169 |
Loads are small in this mild climate, so the common mistake is oversizing. A right-sized heat pump runs longer, quieter cycles and controls humidity better than a rule-of-thumb unit.
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 |
|---|---|---|---|
| Salinas | CZ 3 | Pacific Gas and Electric (PG&E) | 865 |
| Pacific Grove | CZ 3 | Pacific Gas and Electric (PG&E) | 218 |
| Seaside | CZ 3 | Pacific Gas and Electric (PG&E) | 169 |
| Carmel-by-the-Sea | CZ 3 | Pacific Gas and Electric (PG&E) | 123 |
| Soledad | CZ 3 | Pacific Gas and Electric (PG&E) | 107 |
| Gonzales | CZ 3 | Pacific Gas and Electric (PG&E) | 92 |
Guides for Monterey projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Monterey; requirements vary by project. Confirm with the City of Monterey building department.