Do I need a permit for an accessory dwelling unit (ADU) in
Loma Linda, California?

Loma Linda ADU permits — the key details

California Government Code 65852.2 and AB 881 (effective Jan 1, 2022) mandate that every city allow ADUs, overriding local zoning and density rules. Loma Linda's 2017 ADU ordinance was updated to comply; the city now must approve detached ADUs on single-family lots as a matter of right, provided they meet objective design standards (setbacks, height, parking if required by zone). The city cannot impose owner-occupancy requirements (once in effect, now prohibited statewide), cannot require a conditional-use permit, and cannot charge more than 'actual and reasonable' plan-review and inspection costs — not standard impact fees. AB 671 imposes a mandatory 60-day shot clock for ADU plan review; if Loma Linda doesn't issue a determination within 60 days of a 'complete application,' the permit is deemed approved. In practice, Loma Linda rarely hits the deadline without a pre-application review; homeowners who submit incomplete drawings trigger a 'clock stop' and add 3–4 weeks. Submit a pre-application packet 30 days before formal filing to confirm setback and utility feasibility and avoid resubmittals.

Setback and lot-size rules are Loma Linda's most common rejection point. The city's zoning code requires detached ADUs to observe standard residential setbacks: 5 feet from side property lines and 20 feet from rear (for R-1 zones). Detached ADUs also cannot exceed 40% of the primary dwelling's footprint on lots under 5,000 sq ft (this is a local addition not mandated by state law, but within Loma Linda's authority). Junior ADUs (JUADUs) — interior conversions of a primary dwelling or garage — are exempt from the footprint cap and many setback rules; AB 881 allows JUADUs up to 500 sq ft with a second entrance as a second kitchen (not required) and are easier to approve on tight lots. If your lot is under 4,000 sq ft and setbacks don't allow a detached ADU, a JUADU is often the path. Height limits in R-1 zones are 35 feet (or match the primary dwelling, whichever is lower); ADUs on hillside lots in unincorporated Loma Linda may trigger a 'hillside development review' if slope exceeds 15% (add 4–6 weeks).

Utility and mechanical systems must be shown in detail on the permit drawings. Loma Linda Building Department requires a separate water meter or sub-meter, separate electrical service or sub-panel, and a separate gas meter if applicable (or gas sub-metering). Sewer can be tied to the primary dwelling's main line, but the ADU's lateral must be sized per Title 24 standards and the grease trap (if kitchen drain is included) must be shown. Plumbing plans must call out the ADU's own shut-off valve on the main line. Electrical plans must show the sub-panel location, breaker count, and load calculations (per NEC 225.30 for secondary dwelling units); a licensed electrician must design and sign the plan. Water pressure and flow calculations are required if the lot is served by a private well or if Loma Linda's water service is tight (normal in the hillside areas of the city). Failure to show sub-metering details is the #2 reason for plan rejections; City staff will ask for a utility engineer's letter confirming feasibility if the primary dwelling's meters are inadequate. Plan for an extra $500–$1,500 in utility consulting if you're on private well, septic, or hillside terrain.

Fire and emergency egress rules are strict because ADUs are now classified as 'second dwelling units' per IRC R310. Every ADU must have a minimum 36-inch egress door (or window, 24-inch min width and sill height not more than 44 inches from floor) opening directly to exterior or a common stairwell (for upper-story ADUs in duplex scenarios, rare in Loma Linda). If the ADU is in a garage conversion, the connecting door to the primary dwelling must be fire-rated (1-hour, self-closing), and any common wall must be fire-rated per IRC R302 or California Title 24. Sprinkler requirements are triggered if total building area on the lot (primary + ADU) exceeds 5,000 sq ft; Loma Linda applies this aggressively — a 2,000 sq ft primary + 800 sq ft ADU = 2,800 sq ft (no sprinklers), but a 3,500 sq ft primary + 1,800 sq ft ADU = 5,300 sq ft (full fire-sprinkler system required, add $4,000–$8,000 and 2 weeks of design). This is a statewide rule, but Loma Linda's inspectors are thorough — ask the Building Department during pre-app whether your lot will trigger sprinklers.

Permitting timeline and fees: Loma Linda charges $3,000–$10,000 in combined permit and plan-review fees (1.5–2% of project valuation for a $150,000–$300,000 ADU, plus a flat $300–$600 per-plan-set fee). The 60-day shot clock begins after you submit a 'complete' application; Loma Linda's definition of complete includes site plan, floor plan, elevations, sections, electrical/plumbing/HVAC one-line diagrams, structural (if detached), energy compliance (Title 24), and a fire-life-safety check memo. Many homeowners submit incomplete packages and trigger a 'deficiency notice,' which stops the clock. Once approved, inspections are: foundation (if detached), framing, rough trades (plumbing/electrical/HVAC rough-in), insulation/drywall, final building, final electrical, and final plumbing — expect 6–8 weeks from permit issuance to final sign-off. Owner-builder can pull the permit and manage work, but licensed electricians, plumbers, and HVAC contractors must pull trade permits for their work (homeowner exception does not override this statewide requirement). Plan for total timeline: 1 week pre-app + 6–8 weeks permitting + 4–6 weeks construction + 2 weeks inspections = 13–17 weeks best case.

Three Loma Linda accessory dwelling unit (adu) scenarios

Loma Linda's local ADU ordinance vs. state law: what the city can and cannot do

California's statewide ADU laws (Gov. Code 65852.2, AB 881, SB 9) set a floor — every city must allow ADUs, JUADUs, and multiple ADUs on single-family lots. But cities can impose 'objective design standards' (setbacks, height, lot size) that are compatible with state law. Loma Linda's local code does this: it requires detached ADUs to meet standard setbacks (5 ft side, 20 ft rear, 35 ft height in R-1 zones) and caps footprint at 40% of primary dwelling on small lots. These rules are Loma Linda-specific and stricter than some neighbors; San Bernardino County (unincorporated), for example, allows detached ADUs on lots as small as 2,500 sq ft with 10 ft rear setback. Loma Linda's 5,000 sq ft threshold and 40% footprint cap effectively block detached ADUs on smaller lots — but that's where JUADUs fill the gap.

Loma Linda explicitly waived owner-occupancy requirements (which were common pre-2022) and parking minimums under SB 166. The city cannot charge impact fees beyond actual plan-review and building-inspection costs — typically 1.5–2% of valuation for standard residential, not the 10–15% some cities charge for new units. However, Loma Linda can (and does) require utility sub-metering, fire-life-safety compliance, and CEQA analysis if the project is not categorically exempt. Categorically exempt ADUs (under 750 sq ft, not on sensitive land, no endangered species) skip full CEQA review; Loma Linda uses a 'categorical exemption memo' (1–2 pages) in lieu of an Environmental Assessment. If your ADU is on a hillside with sensitive habitat or near a fault line, full CEQA may apply (adds 8–12 weeks and $3,000–$5,000). Ask the Building Department upfront: 'Is this lot CEQA-exempt for an ADU?'

One key local difference: Loma Linda's 60-day clock (per AB 671) only starts after a 'complete application.' The city's checklist is posted online; if you miss even one item (e.g., energy-compliance form, fire-life-safety memo), the clock pauses. Pre-application review with the planning staff (free, 30 min) catches these before formal submission. Loma Linda's online portal (permitting platform) has improved over 2022–2023; submitting digital plans via the portal triggers faster staff review than in-person counter service. Some neighboring cities (e.g., San Bernardino) have slower portals or still prefer paper submissions — Loma Linda's is one of the more modern in the region.

Utility complexity on Loma Linda's topography: water, sewer, well, and septic scenarios

Loma Linda's geography spans coastal flatlands (near Loma Linda University) to foothill terrain. City water and sewer service is reliable in the flat areas; on hillsides and rural edges, private wells and septic systems are common. For city-service ADUs, Loma Linda requires a separate water meter or sub-meter for the ADU; the City's water engineering staff will confirm available pressure and flow during plan review. Some addresses get low-pressure zones (below 50 psi); if so, you may need a pressure-regulating valve or booster pump — adds $500–$1,500 and 1–2 weeks. Sewer can tie to the primary dwelling's main lateral, but Loma Linda (or San Bernardino County if unincorporated) requires the ADU's lateral to be sized for the ADU's fixture count per Title 24; oversized primaries may not need upsizing if the combined load still flows. Grease trap is required if the ADU has a full kitchen; sizing is by fixture count (1 BDR kitchen = 8–10 gallons per day, typically a 500-gallon trap). Failure to show a grease trap on kitchen ADU plans is an automatic rejection.

Private well ADUs are far more complex. Loma Linda's Building Department (or County Health if unincorporated) requires a well-capacity test (pump test showing sustained GPM) before approval. California Title 22 requires a minimum 15 GPM for a single-family dwelling; add another 5–7 GPM for a 1–2 bedroom ADU. If the primary dwelling's well only yields 12 GPM, you cannot add an ADU without drilling a new well (+$8,000–$12,000) or implementing water conservation (low-flow fixtures, drought-resistant landscaping). Septic systems are sized by bedrooms and occupancy; current Title 22 standards are roughly 250 sq ft of leach field per bedroom. A 2-bedroom ADU on a primary dwelling's septic requires either a new septic system or expansion of the existing one — often not feasible on small lots. Loma Linda's EHS (Environmental Health Services) conducts a perc test and soil evaluation ($1,500–$2,500, 3–4 weeks). If percolation is poor (rocky, clay, high water table), a pump-and-pressure system is mandated — adds $3,000–$5,000 and delays by 2–4 weeks. Budget heavily for private-utility ADUs: well $8,000–$12,000 + septic or pump system $3,000–$8,000 + testing $2,000–$3,000 = $13,000–$23,000 in utilities alone, plus 8–12 weeks.

Common questions