MEP Plans in Montebello, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Montebello, prepared for plan check at the City of Montebello building department, with Title 24 available in the same order.
Montebello project facts we design around
| County | Los Angeles County |
|---|---|
| Title 24 climate zone | Climate Zone 9, confirmed by ZIP for every project |
| Electric utility (most addresses) | Southern California Edison (SCE) |
| Permit review | The City of Montebello building department |
| ADU permits issued, 2021–2025 | 236 (#118 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Montebello
Montebello issued 236 ADU building permits from 2021 through 2025, the 118th most among the 450 California cities that reported ADU permits. Permits went from 9 in 2021 to 61 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 9 | 36 | 66 | 64 | 61 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 9
- Windows: U-factor 0.30 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.
- Solar PV sized by the CEC formula kW = (floor area x 0.613) / 1000 + 1.36; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 718 sq ft or smaller.
Climate Zone 9 requirements in full →
HVAC design for Montebello
The California Energy Commission's design-day data for Montebello gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 91°F and a winter design temperature of 33°F.
| Summer design (1%) | 91°F dry bulb / 68°F wet bulb |
|---|---|
| Winter design (median of extremes) | 33°F |
| Daily temperature range | 24°F |
| Elevation | 205 ft |
Both seasons matter here. The heat pump is usually sized for the 91°F cooling condition and then checked to confirm it still covers the heating load at 33°F.
Electrical service from Southern California Edison (SCE)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Southern California Edison (SCE) handles that through its Building, Renovation, and Project Planning Portal, separately from the building permit.
ADU electrical service with Southern California Edison (SCE) →
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 |
|---|---|---|---|
| Los Angeles | CZ 9, 8, 6, 16 | Los Angeles Department of Water and Power (LADWP) | 52,059 |
| Long Beach | CZ 6, 8 | Southern California Edison (SCE) | 3,015 |
| Glendale | CZ 9 | Glendale Water and Power | 2,945 |
| Burbank | CZ 9 | Burbank Water and Power | 1,376 |
| Torrance | CZ 6, 8 | Southern California Edison (SCE) | 1,051 |
| Downey | CZ 8 | Southern California Edison (SCE) | 1,020 |
Los Angeles County → · All California cities and communities →
Guides for Montebello projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Montebello; requirements vary by project. Confirm with the City of Montebello building department.