MEP Plans in Murrieta, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Murrieta, prepared for plan check at the City of Murrieta building department, with Title 24 available in the same order.
Murrieta project facts we design around
| County | Riverside County |
|---|---|
| Title 24 climate zone | Climate Zone 10, confirmed by ZIP for every project |
| Electric utility (most addresses) | Southern California Edison (SCE) |
| Permit review | The City of Murrieta building department |
| ADU permits issued, 2021–2025 | 93 (#228 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Murrieta
Murrieta issued 93 ADU building permits from 2021 through 2025, the 228th most among the 450 California cities that reported ADU permits. Permits went from 9 in 2021 to 24 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 9 | 19 | 7 | 34 | 24 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 10
- 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.
- Cool roof required: steep-sloped roofs need aged solar reflectance 0.2 or higher and thermal emittance 0.75 or higher.
- Solar PV sized by the CEC formula kW = (floor area x 0.627) / 1000 + 1.41; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 622 sq ft or smaller.
Climate Zone 10 requirements in full →
HVAC design for Murrieta
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 10's inland climate with hot summers. Cooling-driven Manual J with real window orientation and glazing.
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 Murrieta projects
Ready for permit-ready MEP plans in Murrieta?
Upload your architectural plans, get an instant flat price, and receive PDF plans in about 5 business days.
Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Murrieta; requirements vary by project. Confirm with the City of Murrieta building department.