MEP Plans in Westmorland, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Westmorland, prepared for plan check at the City of Westmorland building department, with Title 24 available in the same order.
Westmorland project facts we design around
| County | Imperial County |
|---|---|
| Title 24 climate zone | Climate Zone 15, confirmed by ZIP for every project |
| Electric utility (most addresses) | Imperial Irrigation District (IID) |
| Permit review | The City of Westmorland building department |
| ADU permits issued, 2021–2025 | 7 (#409 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Westmorland
Westmorland issued 7 ADU building permits from 2021 through 2025, the 409th most among the 450 California cities that reported ADU permits. Permits went from 2 in 2022 to 3 in 2024.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | 2 | 2 | 3 | not reported |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 15
- Windows: U-factor 0.30 or lower and solar heat gain coefficient (SHGC) 0.20 or lower, with total window area up to 20% of floor area (west-facing up to 5%).
- Cool roof required: steep-sloped roofs need aged solar reflectance 0.2 or higher and thermal emittance 0.75 or higher; low-sloped roofs 0.63 / 0.75.
- Solar PV sized by the CEC formula kW = (floor area x 1.56) / 1000 + 1.47; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 212 sq ft or smaller.
Climate Zone 15 requirements in full →
HVAC design for Westmorland
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 15's high-desert / desert climate with extreme summer heat. Cooling capacity and equipment rated for high outdoor temperatures.
Electrical service from Imperial Irrigation District (IID)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, open that request with Imperial Irrigation District (IID) 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 |
|---|---|---|---|
| El Centro | CZ 15 | Imperial Irrigation District (IID) | 338 |
| Calexico | CZ 15 | Imperial Irrigation District (IID) | 265 |
| Imperial | CZ 15 | Imperial Irrigation District (IID) | 110 |
| Brawley | CZ 15 | Imperial Irrigation District (IID) | 43 |
| Heber (unincorp.) | CZ 15 | Imperial Irrigation District (IID) | 25 |
| Holtville | CZ 15 | Imperial Irrigation District (IID) | 14 |
Guides for Westmorland projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Westmorland; requirements vary by project. Confirm with the City of Westmorland building department.