Hybrid property map
Property possibility reportConfirmed report
Your Property's Possibilities, Clearly Mapped
9900 Gierson Ave Chatsworth 91311
Existing building
2084
Zoning
RE11-1
Lot area · sq ft
10979
Backyard depth · ft
45
Rear lot width · ft
77
Backyard area · sq ft
3477
Perimeter · ft
452
Transportation map
Street view
ZIMAS property map
Possibility 01 · Extra units
Conceptually feasibleDetached Accessory Dwelling Unit
Backyard living opportunity
A private new home may fit in the backyard.
We identified 4 practical concepts to compare. A site survey and City review will confirm the final plan.
Maximum estimated rental potential
800 sq ft ADU Rental Income
Existing main house0 bedrooms · 2,084 sq ftUp to $10,480/month
Detached ADU · 1 bedroom1 bedroom · 800 sq ftUp to $2,250/month
Total potential gross rentUp to $12,730/month$152,760/year before expenses
Preliminary market estimate. Final rent depends on the completed design, property condition, and current market.
Maximum estimated rental potential
1,200 sq ft ADU Rental Income
Existing main house0 bedrooms · 2,084 sq ftUp to $10,480/month
Detached ADU · 2 bedrooms2 bedrooms · 1,200 sq ftUp to $2,800/month
Total potential gross rentUp to $13,280/month$159,360/year before expenses
Preliminary market estimate. Final rent depends on the completed design, property condition, and current market.
Option A · 800 sq ft · One-story detached ADU
A compact first-floor concept sized to the usable yard. Construction is estimated at $215–$235 per square foot.
Option B · 800 sq ft · Two-story detached ADU
A smaller footprint preserves more yard while providing two floors. Construction is estimated at $225–$245 per square foot.
Option C · 1,200 sq ft · One-story detached ADU
A full-size one-story backyard-home concept, shown only when the preliminary mapped site envelope can accommodate it.
Option D · 1,200 sq ft · Two-story detached ADU
A two-story concept with approximately 600 sq ft per floor, shown only when the preliminary mapped site envelope can accommodate it.
Preliminary project cost estimateDetached ADU
Architectural design + permit drawings$4–$6 / sq ft
Structural design + engineering$1–$2.50 / sq ft
Title 24 energy compliance$300 flat
Survey + site plan$1,800–$2,500
Permit coordination$1,500 / permit
Plan check + permit allowance$2,000–$20,000
Design + permit range$11,600–$34,500
Combined planning range$341,600–$484,500
Completed project exampleHatteras One-Bedroom ADU Conversion
View project →
