MEP Plans in Alameda County, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes anywhere in Alameda County, in its cities and in unincorporated areas, with Title 24 available in the same order.
Alameda County project facts we design around
| County seat | Oakland |
|---|---|
| Population | 1,649,060 (Census 2024 estimate) |
| Incorporated cities | 14 |
| Unincorporated residents | About 144,067 (9% of the county) |
| Permits in unincorporated areas | Alameda County Public Works Agency – Building Inspection Division |
| Title 24 climate zones | CZ 3 (about 87% of residents), CZ 12 (about 13% of residents). Confirmed by ZIP for every project |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
HVAC design across Alameda County
Climate Zone 3: mild Bay Area climate (about 87% of residents)
Mild temperatures mean small loads, and many Bay Area ADUs are heated with a single heat pump while cooling is a secondary concern. The harder problems here are usually in the existing house: older homes often have 100-amp (or smaller) services, aging panels and original sewer laterals, which is why the electrical load calculation and the sewer connection deserve attention early.
- Load calculation on an older service before you assume a panel upgrade (or skip one)
- Sewer lateral condition and connection route — some Bay Area cities have lateral inspection rules
- Compact heat pump design for a heating-dominated, low-load unit
Climate Zone 12: Central Valley-style climate — hot summers, cool winters (about 13% of residents)
This is a two-sided load: long stretches above 100°F in summer and cold, foggy winter mornings. The heat pump is usually sized for cooling, then checked to make sure it still carries the heating load at the local winter design temperature. High summer peaks also mean the AC is often the single biggest electrical load, which is what pushes many ADUs into a panel or service upgrade.
- Heat pump sized for cooling and verified for winter heating
- Panel / subpanel sizing that accounts for a large cooling load
- Title 24 envelope and HVAC assumptions that hold up in a demanding zone
Unincorporated Alameda County
Unincorporated communities are permitted by the county, not by a city. County plan check reviews MEP drawings against the same California Mechanical, Electrical and Plumbing Codes and the Title 24 Energy Code as any city, but the submittal checklist, forms and fees are the county's own, so we prepare the set to match. In rural areas, parcels outside a sewer district often rely on a private septic system; adding an ADU can require the county's environmental health division to confirm the system has capacity, and the plumbing plan then shows the connection to the septic tank instead of a sewer lateral.
What's in an Alameda County MEP set
- Mechanical: HVAC layout, Manual J load calculation, equipment schedule, exhaust and whole-unit ventilation
- Electrical: power and lighting plan, panel schedule, NEC 220 load calculation, single-line diagram
- Plumbing: supply and DWV layout, fixture units, water heater, gas (if any), sewer or septic connection
- Title 24 (add-on): energy compliance for your address's climate zone, coordinated with the MEP design so the two documents agree
Pricing is flat statewide: ADU plans from $995, full ADU MEP package from $2,295, Title 24 add-on $240. Standard turnaround is 5 business days with two revisions and corrections included.
Alameda County cities and communities
| Place | Climate zone | Electric utility |
|---|---|---|
| Alameda | CZ 3 | Alameda Municipal Power |
| Albany | CZ 3 | Pacific Gas and Electric (PG&E) |
| Ashland (unincorporated) | CZ 3 | Pacific Gas and Electric (PG&E) |
| Berkeley | CZ 3 | Pacific Gas and Electric (PG&E) |
| Castro Valley (unincorporated) | CZ 3 | Pacific Gas and Electric (PG&E) |
| Cherryland (unincorporated) | CZ 3 | Pacific Gas and Electric (PG&E) |
| Dublin | CZ 12 | Pacific Gas and Electric (PG&E) |
| Emeryville | CZ 3 | Pacific Gas and Electric (PG&E) |
| Fairview (unincorporated) | CZ 3 | Pacific Gas and Electric (PG&E) |
| Fremont | CZ 3 | Pacific Gas and Electric (PG&E) |
| Hayward | CZ 3 | Pacific Gas and Electric (PG&E) |
| Livermore | CZ 12 | Pacific Gas and Electric (PG&E) |
| Newark | CZ 3 | Pacific Gas and Electric (PG&E) |
| Oakland | CZ 3 | Pacific Gas and Electric (PG&E) |
| Piedmont | CZ 3 | Pacific Gas and Electric (PG&E) |
| Pleasanton | CZ 12 | Pacific Gas and Electric (PG&E) |
| San Leandro | CZ 3 | Pacific Gas and Electric (PG&E) |
| San Lorenzo (unincorporated) | CZ 3 | Pacific Gas and Electric (PG&E) |
| Union City | CZ 3 | Pacific Gas and Electric (PG&E) |
Shown for most addresses in each city. We also serve every unincorporated community in the county.
Alameda County ADU MEP questions
Who issues building permits for an ADU in unincorporated Alameda County?
In unincorporated areas, home to about 144,067 residents (9% of the county), ADU and residential permits go through Alameda County Public Works Agency – Building Inspection Division. Inside the county's 14 incorporated cities, that city's own building department reviews the plans instead. We prepare the MEP set for whichever office has jurisdiction over your address.
What Title 24 climate zones are in Alameda County?
Alameda County spans 2 Title 24 climate zones: CZ 3 (about 87% of residents), CZ 12 (about 13% of residents). Zones follow ZIP-code boundaries, so we confirm the zone from your project address before sizing the HVAC or running the Title 24 report.
Who provides electric service in Alameda County?
It depends on the address. In the Alameda County places listed on this page, most addresses are served by Alameda Municipal Power or Pacific Gas and Electric (PG&E). We confirm the serving utility for every project, because service upgrades and new meters are requested from the utility, separately from the building permit.
How much do ADU MEP plans cost in Alameda County?
Our pricing is flat across California: single-discipline ADU plans start at $995, a full MEP package for an ADU up to 600 SF is $2,295, and a Title 24 report can be added for $240. Residential (single-family) full MEP packages start at $3,495. Standard turnaround is 5 business days, and corrections are included.
How long does ADU approval take in Alameda County?
California law requires local agencies, counties included, to approve or deny a complete ADU permit application within 60 days. Incomplete or inconsistent drawings are the most common reason the clock restarts, which is why MEP plans that match the architectural set, and a Title 24 report that matches the MEP design, matter.
Guides for Alameda County projects
Ready for permit-ready MEP plans in Alameda County?
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. Population figures are Census Bureau 2024 estimates; climate zones are from the California Energy Commission's ZIP-code list, weighted by population. Requirements vary by project: confirm with Alameda County Public Works Agency – Building Inspection Division or your city's building department.