MEP Plans in Stinson Beach, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes in Stinson Beach (unincorporated Marin County), prepared for plan check at Marin County Community Development Agency – Building and Safety Division, with Title 24 available in the same order.
Stinson Beach project facts we design around
| County | Marin County (unincorporated) |
|---|---|
| Title 24 climate zone | Climate Zone 3, confirmed by ZIP for every project |
| Electric utility (most addresses) | Pacific Gas and Electric (PG&E) |
| Permits issued by | Marin County Community Development Agency – Building and Safety Division |
| ADU permits issued, 2021–2025 | 5 |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
ADU building activity in Stinson Beach
Marin County issued 5 ADU building permits from 2021 through 2025 for addresses in Stinson Beach, based on the county's reports to the state. Permits went from 1 in 2021 to 1 in 2025.
| 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| 1 | not reported | not reported | 3 | 1 |
Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).
Title 24 in Climate Zone 3
- 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 0.628) / 1000 + 1.12; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 1,083 sq ft or smaller.
Climate Zone 3 requirements in full →
HVAC design for Stinson Beach
The HVAC is sized from a room-by-room Manual J using the outdoor design conditions for the address, in Climate Zone 3's mild Bay Area climate. Load calculation on an older service before you assume a panel upgrade (or skip one).
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. Some Bay Area cities also have private sewer lateral inspection rules, so ask whether your project triggers one.
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 |
|---|---|---|---|
| Novato | CZ 2 | Pacific Gas and Electric (PG&E) | 188 |
| San Rafael | CZ 2 | Pacific Gas and Electric (PG&E) | 157 |
| Mill Valley | CZ 3 | Pacific Gas and Electric (PG&E) | 112 |
| Ross | CZ 2 | Pacific Gas and Electric (PG&E) | 81 |
| Tiburon | CZ 3 | Pacific Gas and Electric (PG&E) | 78 |
| Fairfax | CZ 2 | Pacific Gas and Electric (PG&E) | 68 |
Guides for Stinson Beach projects
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Start My OrderGeneral guidance, not legal advice. Climate zone and utility are shown for most addresses in Stinson Beach; requirements vary by project. Confirm with Marin County Community Development Agency – Building and Safety Division.