MEP Plans in Desert Hot Springs, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Desert Hot Springs, prepared for plan check at the City of Desert Hot Springs building department, with Title 24 available in the same order.
Desert Hot Springs project facts we design around
| County | Riverside County |
|---|---|
| Title 24 climate zone | Climate Zone 15, confirmed by ZIP for every project |
| Electric utility (most addresses) | Southern California Edison (SCE) |
| Permit review | The City of Desert Hot Springs building department |
| ADU permits issued, 2021–2025 | 59 (#283 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Desert Hot Springs
Desert Hot Springs issued 59 ADU building permits from 2021 through 2025, the 283rd most among the 450 California cities that reported ADU permits. Permits went from 2 in 2022 to 25 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| not reported | 2 | 15 | 17 | 25 |
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 Desert Hot Springs
The California Energy Commission's design-day data for Desert Hot Springs gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 110°F and a winter design temperature of 24°F.
| Summer design (1%) | 110°F dry bulb / 72°F wet bulb |
|---|---|
| Winter design (median of extremes) | 24°F |
| Daily temperature range | 35°F |
| Elevation | 1,060 ft |
| Heating degree days | 400 |
Cooling governs equipment size here. At 110°F design conditions, west-facing glass, attic insulation and duct location move the load more than anything else, and the heat pump's electrical load has to be carried into the panel calculation.
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 |
|---|---|---|---|
| Riverside | CZ 10 | Riverside Public Utilities | 1,097 |
| Palm Springs | CZ 15 | Southern California Edison (SCE) | 376 |
| Coachella | CZ 15 | Imperial Irrigation District (IID) | 372 |
| Hemet | CZ 10 | Southern California Edison (SCE) | 317 |
| Moreno Valley | CZ 10 | Southern California Edison (SCE) | 300 |
| Jurupa Valley | CZ 10 | Southern California Edison (SCE) | 284 |
Riverside County → · All California cities and communities →
Guides for Desert Hot Springs projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Desert Hot Springs; requirements vary by project. Confirm with the City of Desert Hot Springs building department.