MEP Plans in Diamond Springs, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Diamond Springs (unincorporated El Dorado County), prepared for plan check at El Dorado County Planning and Building Department – Building Division, with Title 24 available in the same order.
Diamond Springs project facts we design around
| County | El Dorado County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 12, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permits issued by | El Dorado County Planning and Building Department – Building Division |
| ADU permits issued, 2021–2025 | 9 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Diamond Springs
El Dorado County issued 9 ADU building permits from 2021 through 2025 for addresses in Diamond Springs, based on the county's reports to the state. Permits went from 3 in 2021 to 3 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 3 | 2 | 1 | not reported | 3 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 12
- Windows: U-factor 0.27 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 0.613) / 1000 + 1.4; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 653 sq ft or smaller.
Climate Zone 12 requirements in full →
HVAC design for Diamond Springs
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 12's Central Valley-style climate — hot summers, cool winters. Heat pump sized for cooling and verified for winter heating.
Electrical service from Pacific Gas and Electric (PG&E)
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Pacific Gas and Electric (PG&E) handles that through its Your Projects portal, separately from the building permit.
ADU electrical service with Pacific Gas and Electric (PG&E) →
Plumbing and sewer
The plumbing plan shows the route, slope and cleanouts of the connection to the existing sewer lateral or septic system.
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 |
|---|---|---|---|
| Placerville | CZ 12 | Pacific Gas and Electric (PG&E) | 72 |
| Shingle Springs (unincorp.) | CZ 12 | Pacific Gas and Electric (PG&E) | 62 |
| El Dorado Hills (unincorp.) | CZ 12 | Pacific Gas and Electric (PG&E) | 51 |
| South Lake Tahoe | CZ 16 | Liberty Utilities | 37 |
| Cameron Park (unincorp.) | CZ 12 | Pacific Gas and Electric (PG&E) | 17 |
| Camino (unincorp.) | CZ 12 | Pacific Gas and Electric (PG&E) | 17 |
El Dorado County → · All California cities and communities →
Guides for Diamond Springs projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Diamond Springs; requirements vary by project. Confirm with El Dorado County Planning and Building Department – Building Division.