San Gabriel is a mix of historic bungalows, post-war ranch homes, and multi-generational properties clustered around the Mission District, Del Mar Ave, and the neighborhoods that stretch toward Temple City and Alhambra. Many lots are modest in width but deep enough to tuck in a compact cottage. Older detached garages sit on generous rear setbacks, perfect for conversion. Local demand for long-term rentals stays strong thanks to the broader San Gabriel Valley job market and quick access to Pasadena, Downtown LA, and transit corridors. That combination makes an ADU one of the smartest value plays in town.
Short version: land here is expensive; building up livable square footage on land you already own is usually cheaper than moving. If you plan well, the numbers pencil.
An Accessory Dwelling Unit is a self-contained residential unit on the same legal lot as a primary dwelling. It needs its own cooking, bathing, and sleeping areas. You can build it detached, attach it to the main house, convert existing permitted space like a garage, or carve out an internal unit. A Junior ADU (JADU) is a bite-sized unit, up to 500 sq ft, created entirely within the footprint of the primary home, and it can share a bath when certain requirements are met.
Why you should care: The path you choose affects setbacks, parking, utility tie-ins, and review time.
You do not need a discretionary hearing for a code-compliant ADU; review is ministerial. The City must act on a complete application within 60 days. Minimum side and rear setbacks for new detached or attached ADUs are 4 ft. Converting an existing permitted structure generally lets you keep the current setbacks unless fire rules say otherwise. You cannot be forced to replace parking lost when you convert a garage. Owner occupancy cannot be required for standard ADUs approved through 2025. Impact fees are waived for ADUs under 750 sq ft. These state-level protections are why ADUs have exploded across the San Gabriel Valley.
We track local implementation notes so your plans line up with both state law and the way San Gabriel reviews submittals in practice.
Every property is unique, but some patterns repeat.
Deep R1 Lots With Rear Alley Or Drive Access: Great for a new detached ADU in the back corner, often 400 to 1,000 sq ft, depending on lot coverage and utilities. Keep at least 4 ft clear at sides and rear; more is better for maintenance.
Older Detached Garage On Slab: Ideal for a conversion ADU. We inspect foundation condition, slab moisture, and framing. Many 1940s and 1950s garages need structural upgrades, new stem wall or thickened edge, and full insulation, but keeping the footprint saves setback headaches.
Side Yard Additions On Narrow Lots: Sometimes an attached ADU bump out makes more sense than a detached build, especially when the sewer connection is closer to the front.
Multi-Unit And Mixed-Use Parcels: You may add up to two detached ADUs (max 800 sq ft each, 16 ft high) or create interior conversion units in non-habitable space up to 25 percent of the existing unit count. A small apartment court can unlock serious rent.
Nine-foot ceilings in the main living area create volume without blowing height limits. Use vaulted ceilings under gable or hip roofs where allowed. Stack washer-dryer closets in the bathroom zone to save plumbing runs. Use multi-slide or large French doors to open to the yard, bringing in San Gabriel sun. Durable LVP or tile flooring stands up to tenants. Mini split HVAC saves duct space. Use sound-dampening on shared walls if the unit is attached.
We build across the San Gabriel Valley with local crews who know the soils, the inspectors, and the quirks hidden in older framing. Licensed, insured, and experienced with both stick-built and panelized ADU systems. We coordinate soils reports when needed, handle Title 24 energy calcs, and provide transparent budgets you can actually read. Communication matters; you get weekly updates, photo logs, and direct contact with your project lead.
When we scope ADU Construction San Gabriel projects, we always walk utilities, confirm access for concrete trucks, and flag any tree protection rules that could slow you down. That early diligence saves time and money.
How big can I go without impact fees? Under state law, ADUs under 750 sq ft are exempt from development impact fees. Larger units may owe scaled fees.
Do I need to add parking? Often no. Inside a half mile of transit, within an existing structure, or when converting a garage, parking may be waived. Replacement parking for a removed garage is not required.
Can I rent it on Airbnb? Many cities restrict rentals under 30 days. Long-term leases are usually fine. Check current San Gabriel rules before marketing short stays.
Can the City make me live in either unit? No owner occupancy requirement for standard ADUs approved through at least 2025 under state statute. JADUs are different.
How long to permit? Once the City deems your application complete, they must approve or deny within 60 days. Clean plans get through faster.
Have a different question? Ask. We will get you a straight answer.
If you have read this far, you are serious. Use the quick form below to upload photos of your yard, garage, or side lot. We will review zoning, sketch a concept, and schedule an on-site visit. No pressure to consult.
Book your ADU Construction San Gabriel, call today, and let us help you turn unused space into income, family flexibility, and long term property value.
| Zip Code | Area Code | City | County | State |
| 91775 | 323 |626 | San Gabriel | Los Angeles | CA |
| 91776 | 323 |626 |650 | San Gabriel | Los Angeles | CA |
| 91778 | 626 | San Gabriel | Los Angeles | CA |
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