MEP Plans in Bonita, CA

Bonita project facts we design around

County	San Diego County (unincorporated)
Title 24 climate zone	Climate Zone 7, confirmed by ZIP for every project
Electric utility (most addresses)	San Diego Gas & Electric (SDG&E)
Permits issued by	San Diego County Planning & Development Services – Building Division
ADU permits issued, 2021–2025	76
ADU approval timeline	Approve or deny within 60 days of a complete application (state law)

ADU building activity in Bonita

San Diego County issued 76 ADU building permits from 2021 through 2025 for addresses in Bonita, based on the county's reports to the state. Permits went from 20 in 2021 to 9 in 2025.

2021	2022	2023	2024	2025
20	6	17	24	9

Source: California Department of Housing and Community Development, Annual Progress Report data (ADU building permits by year).

Title 24 in Climate Zone 7

• Windows: U-factor 0.30 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%).
• Solar PV sized by the CEC formula kW = (floor area x 0.572) / 1000 + 1.15; no PV is required if that is under 1.8 kWdc, which for a single ADU works out to about 1,136 sq ft or smaller.

Climate Zone 7 requirements in full →

HVAC design for Bonita

The California Energy Commission's design-day data for Bonita gives the outdoor conditions a Manual J load calculation uses: a summer design temperature of 81°F and a winter design temperature of 28°F.

Summer design (1%)	81°F dry bulb / 66°F wet bulb
Winter design (median of extremes)	28°F
Daily temperature range	20°F
Elevation	105 ft
Heating degree days	1,864

Both seasons matter here. The heat pump is usually sized for the 81°F cooling condition and then checked to confirm it still covers the heating load at 28°F.

Electrical service from San Diego Gas & Electric (SDG&E)

If the load calculation shows you need a service upgrade, a second meter or a relocated service, San Diego Gas & Electric (SDG&E) handles that through its My Project Center portal, separately from the building permit.

ADU electrical service with San Diego Gas & Electric (SDG&E) →

Plumbing and sewer

The plumbing plan shows the route, slope and cleanouts of the connection to the existing sewer lateral or septic system.

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.