MEP Plans in Rio Dell, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Rio Dell, prepared for plan check at the City of Rio Dell building department, with Title 24 available in the same order.
Rio Dell project facts we design around
| County | Humboldt County |
|---|---|
| Title 24 climate zone | Climate Zone 1, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permit review | The City of Rio Dell building department |
| ADU permits issued, 2021–2025 | 5 (#413 of 450 cities) |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Rio Dell
Rio Dell issued 5 ADU building permits from 2021 through 2025, the 413th most among the 450 California cities that reported ADU permits. Permits went from 2 in 2021 to 1 in 2023.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 2 | 2 | 1 | not reported | not reported |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 1
- Windows: U-factor 0.27 or lower (no SHGC limit in this zone), with total window area up to 20% of floor area.
- Solar PV sized by the CEC formula kW = (floor area x 0.793) / 1000 + 1.27; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 668 sq ft or smaller.
Climate Zone 1 requirements in full →
HVAC design for Rio Dell
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 1's coastal, marine-influenced climate. Right-size the heat pump from a real Manual J instead of a tonnage guess.
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.
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 |
|---|---|---|---|
| Eureka | CZ 1 | Pacific Gas and Electric (PG&E) | 166 |
| Arcata | CZ 1 | Pacific Gas and Electric (PG&E) | 74 |
| McKinleyville (unincorp.) | CZ 1 | Pacific Gas and Electric (PG&E) | 40 |
| Fortuna | CZ 1 | Pacific Gas and Electric (PG&E) | 17 |
| Ferndale | CZ 1 | Pacific Gas and Electric (PG&E) | 13 |
| Blue Lake | CZ 1 | Pacific Gas and Electric (PG&E) | 6 |
Guides for Rio Dell projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Rio Dell; requirements vary by project. Confirm with the City of Rio Dell building department.