MEP Plans in Santa Clara County, CA
Permit-ready mechanical, electrical and plumbing plans for ADUs, garage conversions, additions and single-family homes anywhere in Santa Clara County, in its cities and in unincorporated areas, with Title 24 available in the same order.
Santa Clara County project facts we design around
| County seat | San Jose |
|---|---|
| Population | 1,926,325 (Census 2024 estimate) |
| Incorporated cities | 15 |
| Unincorporated residents | About 90,066 (5% of the county) |
| Permits in unincorporated areas | Santa Clara County Department of Planning and Development |
| Title 24 climate zones | Climate Zone 4. Confirmed by ZIP for every project |
| ADU approval timeline | Approve or deny within 60 days of a complete application (state law) |
HVAC design across Santa Clara County
Climate Zone 4: mild Bay Area climate.
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
Unincorporated Santa Clara 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 a Santa Clara 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.
Santa Clara County cities and communities
| Place | Climate zone | Electric utility |
|---|---|---|
| Campbell | CZ 4 | Pacific Gas and Electric (PG&E) |
| Cupertino | CZ 4 | Pacific Gas and Electric (PG&E) |
| Gilroy | CZ 4 | Pacific Gas and Electric (PG&E) |
| Los Altos | CZ 4 | Pacific Gas and Electric (PG&E) |
| Los Altos Hills | CZ 4 | Pacific Gas and Electric (PG&E) |
| Los Gatos | CZ 4 | Pacific Gas and Electric (PG&E) |
| Milpitas | CZ 4 | Pacific Gas and Electric (PG&E) |
| Monte Sereno | CZ 4 | Pacific Gas and Electric (PG&E) |
| Morgan Hill | CZ 4 | Pacific Gas and Electric (PG&E) |
| Mountain View | CZ 4 | Pacific Gas and Electric (PG&E) |
| Palo Alto | CZ 4 | City of Palo Alto Utilities |
| San Jose | CZ 4 | Pacific Gas and Electric (PG&E) |
| San Martin (unincorporated) | CZ 4 | Pacific Gas and Electric (PG&E) |
| Santa Clara | CZ 4 | Silicon Valley Power |
| Saratoga | CZ 4 | Pacific Gas and Electric (PG&E) |
| Sunnyvale | CZ 4 | Pacific Gas and Electric (PG&E) |
Shown for most addresses in each city. We also serve every unincorporated community in the county.
Santa Clara County ADU MEP questions
Who issues building permits for an ADU in unincorporated Santa Clara County?
In unincorporated areas, home to about 90,066 residents (5% of the county), ADU and residential permits go through Santa Clara County Department of Planning and Development. Inside the county's 15 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 Santa Clara County?
All of Santa Clara County is in California Climate Zone 4 on the Energy Commission's ZIP-code list. The climate zone drives the Title 24 energy calculation and the HVAC sizing.
Who provides electric service in Santa Clara County?
It depends on the address. In the Santa Clara County places listed on this page, most addresses are served by Pacific Gas and Electric (PG&E), City of Palo Alto Utilities or Silicon Valley Power. 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 Santa Clara 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 Santa Clara 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 Santa Clara County projects
Ready for permit-ready MEP plans in Santa Clara 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 Santa Clara County Department of Planning and Development or your city's building department.