A full analysis of what's legally possible, what each scenario earns, and what your property is genuinely worth — before you commit to a single builder.
This property is a strong candidate for ADU and JADU development under California's current state laws. The lot dimensions, zoning, and absentee owner status combine to make this a particularly attractive opportunity for a homeowner looking to add rental income or an investor evaluating density potential.
The analysis below outlines three legal development scenarios, projects rental income on each, and quantifies the construction cost advantage available through PrefabIQ's factory supply chain versus a California site-built equivalent.
| Location | Santa Monica, CA · West Side |
| Zoning code | SMR1* — Single-Unit Residential (asterisk indicates overlay) |
| Lot dimensions | 50 ft frontage × 160 ft depth |
| Lot area | 7,987 sf (0.183 acres) |
| Existing structure | 1,435 sf single-family residence (1 story) |
| Year built | 1952 |
| Owner type | Absentee (investor signal) |
| Water | Public — connected |
| Sewer | Not on record — verify connection (flag below) |
| 2025 assessed value | $360,912 · land value $240,076 |
Santa Monica R1 zoning establishes the development envelope. The ADU portion is governed by both city ADU ordinance and California state law (whichever is more permissive).
| Standard | Requirement |
|---|---|
| Max height (primary structure) | 28 ft · 2 stories |
| Max height (detached ADU) | 16 ft typical · up to 25 ft for two-story |
| Max parcel coverage | 45% new construction |
| Front setback (primary) | 20 ft minimum |
| Side setbacks (primary) | 5 ft each side on 50ft lot (10% of width) |
| Rear setback (primary) | ~15 ft typical |
| ADU side/rear setbacks | 4 ft minimum (state law) |
| ADU parking required | None — within ½ mile of transit |
| Short-term rentals | Not permitted (30-day minimum lease) |
The following scenarios are arranged from most straightforward to most aggressive. All three are legally permissible under current California state law and Santa Monica's ADU ordinance.
Keep the existing 1,435 sf primary residence intact. Add a single detached ADU of up to 1,200 sf in the rear yard with 4ft side/rear setbacks. Ministerial approval — no hearing required.
Buildable rear envelope: 160ft depth minus 20ft front and ~15ft rear setbacks = 125ft of usable lot depth. At 50ft width minus 8ft of side setbacks = 42ft buildable width. A 1,200 sf ADU fits comfortably in this envelope.
California state law explicitly permits one ADU and one JADU on a single-family R1 lot simultaneously. The detached ADU sits in the rear yard. The JADU is created within the existing primary structure (up to 500 sf, sharing walls with the primary).
This is the highest-yield scenario that does not require an SB-9 lot split. Three completely separate income-generating units on one foundation, one property tax bill.
A 7,987 sf lot qualifies for SB-9 lot split analysis (lots must be at least 2,400 sf with each resulting lot at least 1,200 sf). A split would create two parcels of ~4,000 sf each, with each parcel capable of supporting its own primary residence + ADU.
Note: Santa Monica's SB-9 implementation rules and the SMR1* overlay require specific verification at the planning department. Recommended only if maximum density is the primary goal and the timeline allows for additional permit complexity.
Rental projections below reflect current Santa Monica West Side submarket conditions. Numbers represent the recommended Scenario B (3 units total).
| Unit | Size | Est. monthly rent | Annual income |
|---|---|---|---|
| Primary residence | 1,435 sf | $4,500 – $6,500 | $54k – $78k |
| Detached ADU (new) | 800 – 1,200 sf | $2,800 – $4,200 | $33.6k – $50.4k |
| JADU (within primary) | up to 500 sf | $1,800 – $2,500 | $21.6k – $30k |
| TOTAL ANNUAL — All three units rented | $9,100 – $13,200 /mo | $109k – $158k | |
Your Property Potential Report is delivered in 48 hours. Includes everything you see here — specific to your address, your zoning, your goals.
PrefabIQ is an independent strategic partner connecting California homeowners to proven prefab architects, GCs, and direct factory access through our supply chain. All projections are estimates based on current market conditions and publicly available zoning data. Verify all zoning and permit requirements directly with the relevant municipal authority before committing to any project. Sample report prepared from publicly available data for demonstration purposes.