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Report ready APN 8421020002

18314 E BROOKPORT ST COVINA CA 91722

Los Angeles area · COVINA CA, CA 91722-2731
Lot size
6,139
sq ft · 0.14 ac
Zoning
—
Residential
Existing home
971
sq ft · 3 BR / 1 BA
Year built
1954
15.8% lot coverage
Buildability verdict
Likely buildable
Your parcel clears the major regulatory checks. 1 of 13 overlays passed cleanly.
Based on 13 regulatory overlays and your zoning designation.
13 LA City Overlays

Every overlay your parcel intersects

We run the same checks the LA Planning department would. Flags don't mean stop — they mean an extra review step.
1 pass 12 n/a
01 Zoning (single-family base)
Zoning unknown
02 Hillside Ordinance Area
Outside City of LA overlay data
03 Coastal Zone
Outside City of LA overlay data
04 Very High Fire Hazard Severity Zone
Outside City of LA overlay data
05 Methane Hazard Site
Outside City of LA overlay data
06 Flood Hazard Zone
Outside City of LA overlay data
07 Historic Preservation Overlay (HPOZ)
Outside City of LA overlay data
08 Historic-Cultural Monument
Outside City of LA overlay data
09 Rent Stabilization Ordinance
Outside City of LA overlay data
10 Alquist-Priolo Fault Zone
Outside City of LA overlay data
11 Earthquake-Induced Liquefaction
Outside City of LA overlay data
12 Earthquake-Induced Landslide
Outside City of LA overlay data
13 Specific Plan Area
Outside City of LA overlay data
ADU Size & Setbacks

What you can put on this lot

The maximum ADU size, height, and setbacks allowed under Los Angeles and California state ADU law.
Max detached ADU
1,200 sq ft
Up to 16' tall · per Los Angeles + CA state ADU law
Interior JADU
500 sq ft
Carved from your existing home

Detached ADU may be up to 50% of primary dwelling sq ft, not to exceed 1,200 sq ft. Attached ADU limited to 50% of primary dwelling.

Required setbacks
Side
4 ft
each side
Rear
4 ft
minimum
Front
Match home
existing setback

Fire Zone 1 and hillside properties may require additional setbacks.

Max height
16 ft · 25 ft attached
18 ft permitted within ½ mile of a major transit stop.
Parking required
No
Replacement parking not required. Most of LA is within ½ mile of transit.
Permit fees
$10k–$22k
Fees include plan check, permit issuance, school fees, and fire/safety review. Fees vary significantly by size and location.
Source · Los Angeles planning code
Jurisdiction Rules

What Los Angeles requires

City-specific ADU conditions on top of California state law. The full rules page has every setback, size, and fee detail.
Local conditions
Special ADU rules in Los Angeles
Full Los Angeles ADU rules
  • ADU Standard Plan Program available — pre-approved plans can reduce permit review time by 4–6 weeks.
  • Very High Fire Hazard Severity Zone (VHFHSZ) properties require Class A roofing, fire-resistant exterior materials, and ember-resistant vents.
  • Coastal Zone properties along the Pacific Coast corridor may require a Coastal Development Permit from the California Coastal Commission.
  • Historic Preservation Overlay Zones (HPOZs) require design review for any new structure visible from the public right-of-way.
  • Owner-occupancy not required (AB 976, effective Jan 2023).

Source: Los Angeles planning code · Last updated 2026-05-27. ADU rules change frequently — verify with the local building department.

All-in Cost Estimate

Six ways to ADU this property

Cost includes design, permits, materials, labor, soft costs, and site work. Based on LADU's project history in similar lots — not a quote.
JADU — inside existing home
JADU — inside existing home
Studio / 1 BA · up to 500 sf
All-in cost estimate
$97k–$124k
construction $87k–$102k · fees $10k–$22k
11–15 mo total build 6–10 mo
Carved from existing footprint. Fastest path, lowest permit risk.
Refine in calculator
Garage Conversion
Garage Conversion
1 BR / 1 BA · up to 420 sf
All-in cost estimate
$88k–$113k
construction $78k–$91k · fees $10k–$22k
11–15 mo total build 6–10 mo
Existing structure — no new foundation. Streamlined permitting.
Refine in calculator
Best fit
Detached 1 BR
Detached 1 BR
1 BR / 1 BA · up to 750 sf
All-in cost estimate
$235k–$285k
construction $225k–$263k · fees $10k–$22k
11–15 mo total build 6–10 mo
New construction, factory-built shell. Best yield per dollar.
Refine in calculator
Detached 2 BR
Detached 2 BR
2 BR / 2 BA · up to 1100 sf
All-in cost estimate
$340k–$407k
construction $330k–$385k · fees $10k–$22k
11–15 mo total build 6–10 mo
Maxes allowable detached size. Highest resale lift.
Refine in calculator
Prefab 1 BR
Prefab 1 BR
1 BR / 1 BA · up to 600 sf
All-in cost estimate
$190k–$202k
unit $180k · fees $10k–$22k
9–11 mo total build 4–6 mo
Factory-built unit. Fastest install once the site is ready.
Refine in calculator
Prefab 2 BR
Prefab 2 BR
2 BR / 2 BA · up to 1200 sf
All-in cost estimate
$380k–$392k
unit $370k · fees $10k–$22k
9–11 mo total build 4–6 mo
Full-size factory-built unit. Speed of prefab at max size.
Refine in calculator
Property Value

What this property is worth today

An estimate derived from public assessor records. Use it as a starting point for financing, not as an appraisal.
Estimated market value
$580,000 – $760,000
Midpoint $670,000
$580,000 $760,000
From the LA County Assessor
Assessed land
$228,093
Assessed improvements
$163,650
Total assessed value
$391,743
Prop-13 base year
2011

Prop-13-corrected: the assessed value can rise at most 2%/yr, so a long-held home is assessed far below market. We re-grow the base-year value at LA County's actual home-price appreciation (1.71× here). Indicative only — not an appraisal. Source: LA County Assessor public records.

LADU Timeline

From today to move-in ready

LADU handles every step — design, permits, build, inspection. You make 5–7 decisions total.
From kickoff to keys
Traditional build vs. prefab
Prefab ≈ 3 mo faster
Traditional build Site-built, stick framing
11–15 mo
Construction 6–10 mo · approvals add ~5 mo
Prefab ADU Factory-built, installed on site
9–11 mo
Construction 4–6 mo · approvals add ~5 mo
Site visit Design Permit submittal City review Construction Final inspection
Nearby ADUs

ADUs near this address

LADU's own completed projects. LADU pins show the neighborhood only — never a client's street address.
This property LADU projects (8)

LADU project pins show the neighborhood only — client addresses are kept private. Permit pins are public records from LA County Building & Safety.

LADU projects near 18314 E BROOKPORT ST COVINA CA 91722

  • Legalization in Arcadia, 91006 — 7.4 miles away
  • Legalization in El Monte, 91731 — 7.8 miles away
  • Legalization in Rosemead, 91770 — 10.3 miles away
  • Legalization in Rosemead, 91770 — 11 miles away
  • Design / build in San Gabriel, 91775 — 13 miles away
  • Legalization in Pico Rivera, 90660 — 13.3 miles away
  • Legalization in Pasadena, 91104 — 13.8 miles away
  • Legalization in Pasadena, 91104 — 14.6 miles away
One team, one process, zero headache
Ready to talk to an ADU expert?
We'll come measure 18314 E BROOKPORT ST COVINA CA 91722, walk you through your options, and give you a firm bid.
Schedule a free site visit (213) 855-3334
Report generated June 20, 2026 · Sources: City of LA ZIMAS, LA County Assessor, CA HCD, LA City Building & Safety