MEP Plans in Redding, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Redding, prepared for plan check at the City of Redding building department, with Title 24 available in the same order.
Redding project facts we design around
| County | Shasta County |
|---|---|
| Title 24 climate zone | Climate Zone 11, confirmed by ZIP for every project |
| Electric utility (most addresses) | Redding Electric Utility |
| Permit review | The City of Redding building department |
| ADU permits issued, 2021–2025 | 77 (#256 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Redding
Redding issued 77 ADU building permits from 2021 through 2025, the 256th most among the 450 California cities that reported ADU permits. Permits went from 4 in 2021 to 26 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 4 | 3 | 18 | 26 | 26 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 11
- 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 0.836) / 1000 + 1.44; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 431 sq ft or smaller.
Climate Zone 11 requirements in full →
HVAC design for Redding
The California Energy Commission's design-day data for Redding gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 101°F and a winter design temperature of 26°F.
| Summer design (1%) | 101°F dry bulb / 68°F wet bulb |
|---|---|
| Winter design (median of extremes) | 26°F |
| Daily temperature range | 30°F |
| Elevation | 470 ft |
| Heating degree days | 2,544 |
Cooling governs equipment size here. At 101°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 Redding Electric Utility
If the load calculation shows you need a service upgrade, a second meter or a relocated service, Redding Electric Utility handles that through its Distribution Planning group, separately from the building permit.
ADU electrical service with Redding Electric Utility →
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 |
|---|---|---|---|
| Palo Cedro (unincorp.) | CZ 11 | Pacific Gas and Electric (PG&E) | 25 |
| Shasta Lake | CZ 11 | City of Shasta Lake Electric Utility | 11 |
| Cottonwood (unincorp.) | CZ 11 | Pacific Gas and Electric (PG&E) | 10 |
| Anderson | CZ 11 | Pacific Gas and Electric (PG&E) | 9 |
| Shingletown (unincorp.) | CZ 11 | Pacific Gas and Electric (PG&E) | 7 |
Guides for Redding projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Redding; requirements vary by project. Confirm with the City of Redding building department.