MEP Plans in Westlake Village, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Westlake Village, prepared for plan check at the City of Westlake Village building department, with Title 24 available in the same order.
Westlake Village 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 Westlake Village building department |
| ADU permits issued, 2021–2025 | 6 (#412 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Westlake Village
Westlake Village issued 6 ADU building permits from 2021 through 2025, the 412th most among the 450 California cities that reported ADU permits. Permits went from 1 in 2023 to 3 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | not reported | 1 | 2 | 3 |
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 Westlake Village
The California Energy Commission's design-day data for Westlake Village gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 98°F and a winter design temperature of 26°F.
| Summer design (1%) | 98°F dry bulb / 70°F wet bulb |
|---|---|
| Winter design (median of extremes) | 26°F |
| Daily temperature range | 26°F |
| Elevation | 750 ft |
Both seasons matter here. The heat pump is usually sized for the 98°F cooling condition and then checked to confirm it still covers the heating load at 26°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 Westlake Village projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Westlake Village; requirements vary by project. Confirm with the City of Westlake Village building department.