The ADU/JADU Opportunity
Accessory Dwelling Units (ADUs) and Junior ADUs (JADUs) have fundamentally changed the calculus of California residential development. Recent state legislation has dramatically expanded where and how ADUs can be built, removed most owner-occupancy requirements, and reduced permitting friction to historic lows.
When properly stacked with the primary structure, ADUs and JADUs can add 20–40% additional income or sale value to a project — without a proportional increase in land cost.
ADU vs. JADU — Key Differences
- ADU: A fully independent unit with its own kitchen, bath, and entrance. Can be detached or attached. Up to 1,200 sq ft.
- JADU: A Junior ADU carved out of the primary residence. Maximum 500 sq ft. Must share a wall with the primary unit and include an efficiency kitchen.
- Stacking: A single parcel can now legally accommodate a primary unit, a JADU within the primary structure, and a detached ADU — three income-producing units on what was previously a single-family lot.
The SKDM Stacking Methodology
SKDM has refined an ADU/JADU stacking methodology across multiple completed projects. Our approach maximizes allowable square footage within setback and FAR constraints, while navigating the specific owner-occupancy and utility requirements that vary by municipality across LA, Riverside, and San Bernardino.
- Site analysis to determine maximum ADU/JADU yield per parcel
- Design coordination to optimize primary unit + ADU + JADU layouts simultaneously
- Permitting strategy tailored to each municipality's specific ADU ordinance
- Financial modeling to quantify rental income vs. sale value scenarios
SKDM Action Item
Own a property in California? Contact SKDM for a complimentary ADU feasibility review. We'll assess your parcel's ADU/JADU potential, model the financial impact, and outline a path to maximizing your site's value.