ADUs in Compton
Generous lot sizes and accelerating rents make Compton one of the highest-ROI ADU markets in South LA.
- Permit authority
- Compton Building & Safetya
Figures are typical ranges for the Compton market — not a quote. See methodology & sources below for how each number is derived.
What an ADU costs in Compton.
Turnkey pricing — design, permits, and construction included.
≈ 400 sq ft
Garage conversion
from $130K
Fastest path to keys
480 sq ft
Detached studio
from $160K
750 sq ft
Detached 1-BR
from $255K
1,000 sq ft
Detached 2-BR
from $350K
Highest long-term ROI
- Garage conversion$130K
- Detached studio$160K
- Detached 1-BR$255K
- Detached 2-BR$350K
The path through Compton Building &.
SoCal Edison territory — service upgrades typically 4–6 wks.
- Plan check window
- 70–120 days
- Permit + impact fees
- $16K–$26K
- Authority
- Compton Building & Safety
- Standard plans
- Custom plans typical
From contract to certificate of occupancy.
- 011–3 wks
Feasibility & survey
APN pull, zoning, overlays, utility records.
- 024–8 wks
Design & Title 24
Schematic, structural, energy compliance.
- 03see above
Permitting
Plan check at the local jurisdiction.
- 048–12 wks
Foundation & framing
Mobilize, pour, frame, dry-in.
- 0510–14 wks
MEP & finishes
Rough-in, drywall, kitchen, bath, paint.
- 062–3 wks
Inspections & closeout
Final inspections, certificate of occupancy.
- Feasibility & survey1–3 wks
- Design & Title 244–8 wks
- Foundation & framing8–12 wks
- MEP & finishes10–14 wks
- Inspections & closeout2–3 wks
§ IV · Local notes
- 01State ADU law dominates; few local overlays slow projects down.
- 02Wide R-1 lots support detached 2-BR units with rear-yard access.
- 03Strong workforce-housing demand from nearby logistics corridors.
What's true only in Compton.
Microclimate, ground, history, and economics — the inputs to a design that fits here.
CEC Zone 8
Inland coastal — warmer than Long Beach, cooler than Downey.
Summer high
86°F avg
Winter low
48°F avg
Marine layer
Light morning, gone by 10am.
Wildfire zone (WUI)
None
Coastal Commission
Not in zone
Best break-ground
October — past summer monsoon dust.
How we set foundations here.
What looks at home in Compton.
Designs that read as native get approved faster and rent for more.
- California Bungalow
- Spanish Revival
- Post-war Ranch
- Painted stucco
- Brick wainscot
- Composition siding
Money on the table, specifically here.
- SCE heat-pump rebate$1,250
- Metro Water turf$3/sq ft
- TECH Clean CA range$500
The stuff you only learn by showing up.
Anchors we use when scheduling deliveries, inspections, and tenant tours.
- Aprilia Ave
- Slater St
- S Wilmington Ave
Zoning, compliance, fees & market — Compton.
Editorial typicals — verify against your specific lot and the cited ordinance.
Zoning specifics
- Max ADU size
- 1,200 detached · 1,000 attached
- Height limit
- 16 ft · 18 ft transit-adjacent
- Setbacks (rear / side)
- 4 ft rear · 4 ft side
- Owner occupancy
- Not required
- JADU rules
- Max 500 sq ft
- Short-term rental
- No dedicated STR ordinance — defaults to residential use rules
Compliance triggers
- Fire sprinkler trigger
- Required only if primary has them
- Solar PV required
- Yes — new detached
- EV charger required
- EV-ready required
- Defensible space (WUI)
- N/A
- Stormwater / LID
- Required (LA County MS4)
Fees & inspections
- Impact-fee waiver
- <750 sq ft fee-exempt
- School-facility fee
- $4.79/sq ft (Compton USD)
- Typical inspections
- 7–9
- Construction hours
- Mon–Fri 7:00am–7:00pm · Sat 8:00am–5:00pm · Sun prohibited
Market data
- Median home value
- ≈ $620K
- 5-yr appreciation
- +38% (highest growth in this list)
- Typical cap rate
- 6.0–7.5%
- Rental days-on-market
- 12–20 days
"640 sq ft 1-BR garage conversion off Aprilia — leased $1,950/mo, Aug 2024"
Phase I ESA recommended on parcels with pre-1970s industrial history (residual oil/lead).
- City of Compton planning ↗
- CA HCD ADU Handbook (2024) ↗
- CA Title 24, Part 6 (2022) — solar PV requirements ↗
- Zillow Research — home value & rent index ↗
Figures are editorial typicals compiled from public planning ordinances, CA HCD guidance, and publicly reported market data. Always confirm against your APN, current city counter handouts, and a licensed surveyor's findings before financial decisions.
What it actually feels like in Compton, right now.
Twenty signals a superintendent actually reads before deciding to pour, paint, deck a roof, or send a crane day. Pulled live the moment this page loads — Google Weather + EPA AQI + Pollen — for the exact coordinates of Compton.
Inland coastal — warmer than Long Beach, cooler than Downey.
Reading sky…
Feels — · wind — · humidity —%
Reading the air
Reading pollen…
—
Twenty calls for today's site.
Derived from live feedSource: Google Maps Platform — Weather, Air Quality & Pollen APIs · coords 33.896, -118.220 · —
Hazard profile — Compton
USGS · FEMA · CAL FIRE
Three risks that shape what we build and how we build it: seismicity, flooding, and wildfire WUI.
CBC Seismic Design Category D applies across LA County. Every ADU we build uses pre-engineered shear-wall hold-downs and Simpson Strong-Tie connectors.
Querying FEMA NFHL…
Minimal FEMA exposure. Standard CA grading and drainage practices apply.
Outside the Wildland-Urban Interface — standard CBC exterior assemblies permitted.
Sources: USGS FDSN earthquake catalog (last 30 days, 80 km radius) · FEMA NFHL flood hazard zones (point lookup) · CAL FIRE Fire Hazard Severity Zones (LRA/SRA composite).
Solar potential in Compton
Google Solar API · — imagery
Roof-resolution analysis for the city centroid — apply a specific address above for parcel-level data.
Awaiting imagery
Direct usable solar hours on best roof segment
Standard residential mod
Equivalent metric tons of CO₂ avoided annually
Source: Google Solar API (building-insights, max-config). Energy converted to USD at the statewide residential weighted-average rate (CPUC, 2025). Your exact parcel will deviate based on shading, azimuth, and panel choice.
Pressure-test your Compton ADU before you sign.
Enter a specific address or ZIP to retarget every module below to your parcel — envelope, energy code, and ministerial-approval eligibility.
What fits on a Compton lot.
Live-modeled per California state ADU law (AB 2221). Side and rear setbacks pinned to the 4-ft state minimum; adjust lot size and front conditions below.
- Rear-yard buildable
- 3,024 sq ft
- Max ADU footprint
- 1,200 sq ft
- Side / rear setback
- 4 ft each
- Max height (detached)
- 16 ft
state cap
state minimum
AB 2221
Compton sits in Climate Zone 9 — Inland Valleys.
San Fernando / San Gabriel valleys. Hot summers, cool winters.
- HVAC strategy
- Right-sized heat pump; cool roof required. Whole-house fan adds value.
- Envelope minimums
- Wall R-19 · Ceiling R-38 · Slab perimeter R-5
- Glazing performance
- U-0.30 · SHGC 0.23
- Compliance cost impact
- moderate vs CZ 6 baseline
Per CEC Reference Appendices JA1. Numbers are 2022 Title 24 Part 6 prescriptive baseline for low-rise residential; performance path may substitute trade-offs.
Do you qualify for the 60-day state path?
California's Gov't Code §65852.2 forces Compton Building & to approve a compliant ADU within 60 days — no discretionary review. Answer six yes/no questions to see if your project qualifies.
- 01
Is your parcel zoned single-family or multi-family residential?
R-1, R-2, R-3, RD — most LA County residential lots qualify.
- 02
Is there an existing or proposed primary dwelling on the lot?
ADUs are accessory by definition — a primary unit must exist.
- 03
Will the ADU be ≤ 1,200 sq ft and ≤ 16 ft tall (detached)?
State law guarantees ministerial approval within these limits.
- 04
Can you meet 4-ft side and rear setbacks?
State minimum — local zoning cannot require more for state-eligible ADUs.
- 05
Will the owner occupy either the primary or the ADU?
Required only for JADUs after Jan 2025; standard ADUs are exempt.
- 06
Is the property free of HOA restrictions that prohibit ADUs?
AB 670 voids HOA bans on ADUs in SFR zones — but check CC&Rs.
Answer all six to see your path.
ADU return modeler — Compton
Interactive
Pre-seeded with Compton pricing and rent. Tune the inputs to model your parcel — the numbers update instantly.
Model assumes a single long-term tenant. STR/MTR scenarios run materially higher but require operator overhead — happy to model those on request. Not a securities offering or financial advice; for planning use only.
Material suppliers near Compton
Google Places · 8 km radius
Live look at where our crews source lumber, hardware, and bulk materials — useful when you want to walk into a yard yourself.
Source: Google Places API (New) · nearby search · ranked by distance from Compton centroid.
Pick your neighborhood — numbers re-tune.
Showing citywide typicals for Compton. Pick a neighborhood above to see lot character, ZIP-level rent ranges, a recent comp, and the permit nuance unique to that block.
Richland Farms
ZIP 90221
East Compton
ZIP 90221
West Compton
ZIP 90220
Downtown Compton
ZIP 90220
Recent work in Compton & adjacent submarkets.
- 14Plate № 142025
Compton Workforce 2-BR
Detached 2-BR ADU · 950 sq ft
Local · Compton
- 07Plate № 072025
Culver Conversion
Garage Conversion · 480 sq ft
Adjacent submarket
- 09Plate № 092025
Manhattan Beach Studio
Detached ADU · 550 sq ft
Adjacent submarket
Related research for Compton
- Line-by-line adu pricing for ComptonCost transparency
- Compton ADU return calculatorFinancial modeling
- How owners finance a build like thisCapital options
- ADU in Compton: budget questionsFAQ — Cost & Budget
- ADU permits in Compton: every questionFAQ — Permits & Code
- Realistic timelines for Compton projectsFAQ — Timeline & Phases
- Financing FAQ — loans, escrow, drawsFAQ — Financing & ROI
- Design FAQ — materials, layouts, energy codeFAQ — Design & Specs
- Renting an ADU in Compton — rules and yieldsFAQ — Rental & Tax
- Compare adu in Compton vs Beverly HillsCross-city signal
- Compton owners often also consider Santa MonicaCross-city signal
- Compton owners often also consider PasadenaCross-city signal
- Compare adu in Compton vs Long BeachCross-city signal
- Compton owners often also consider BurbankCross-city signal
- Glendale adu — permits & turnaroundCross-city signal
- Browse every city we build ADUs inService hub
- The anatomy of an LA ADU build, line by lineEditorial deep-dive
- The LA ADU permit timeline, week by weekEditorial deep-dive
- Deep dive — Detached, attached, or conversion: choosing the right ADU typeEditorial deep-dive
- Deep dive — Financing an ADU without overpaying for the privilegeEditorial deep-dive
- See our Compton Workforce 2-BR in ComptonProof of work
- Case study: Culver ConversionProof of work
- LegalPillar guide
- CostPillar guide
- Definition: ADUEntity definition
- Definition: JADUEntity definition
- What is Detached ADU?Entity definition
- What is Attached ADU?Entity definition
How these Compton numbers are derived.
Every figure on this page falls into one of three confidence tiers. We publish the method so you can pressure-test the math before signing.
- Firm
- Pulled from our last 24 months of executed contracts in the region. Quoted ranges, not single points.
- Market data
- Sourced from third-party market trackers (Zillow, Apartments.com, RentCafe) within the last 90 days.
- Modeled
- Estimated from public records, jurisdictional bulletins, and our pro-forma model. Treat as a planning band.
- a
Permit authority & plan check days
Compton Building & Safety is the issuing jurisdiction. Plan-check window of 70–120 days reflects our last twelve submittals here for code-compliant ADU sets; complex sites (hillside, historic, coastal) trend longer. Verified against the jurisdiction's published service-level targets where available.
- b
Median lot size
Modeled from LA County Assessor parcel records (APN database) for R-1 and R-2 zoned residential parcels in the Compton city limits. Excludes commercial, multi-family ≥4 units, and parcels under 2,500 sq ft. Median, not mean — large estate lots do not skew the figure.
- c
1-BR & 2-BR rents
90-day trailing median asking rent for ADU-equivalent units (detached cottages, in-law suites, garage conversions) within the Compton ZIP codes, blended across Zillow Rent Index, Apartments.com, and RentCafe. Excludes furnished short-term listings.
- d
Starting price & cost / sq ft
Firm. Averaged from our last 24 months of signed contracts for comparable scope (Compton or adjacent submarket). Includes design, permits, construction, and standard finish package; excludes site-specific utility upgrades (see permit notes) and owner-furnished appliances. Quoted from $135K.
- e
Estimated annual ROI
Modeled as (annual gross rent − operating expenses) ÷ all-in project cost. Assumes 95% occupancy, 8% opex (insurance, maintenance, vacancy reserve), and the 2-BR rent above. Does not include appreciation, tax benefits, or financing leverage — those typically add 3–6 points. Published range of 13–17% reflects floor and ceiling scenarios.
Numbers refresh quarterly. For a binding figure on your specific parcel, request a feasibility letter — we'll pull live permit history, utility records, and comps within 48 hours.
§ VII · Compton · 7 entries
Questions, answered for Compton.
The answers below use Compton's own permit window, fees, and rents — not generic county-wide ranges. For the full reference, see the Reference Desk.
Don't see your question? The full Reference Desk has every answer across cost, permits, SB-9, rentals, and process.
Other cities
Compton reference desk
Questions Compton homeowners ask us
Pulled from our 5,000-answer California reference desk — filtered to permits, costs, ROI, and design calls that actually matter on Compton lots.
What does a ADU cost in Compton in 2026?
In Compton, a turnkey ADU typically starts around $135K and runs $300–$355 per square foot installed, depending on size, finish tier, and site conditions. Permit and impact fees layer $16K–$26K on top of construction, and Compton Building & Safety runs plan check 70–120 days on a clean submittal.What are the actual permit and impact fees for a ADU in Compton?
For a permitted construction scope in Compton, the Compton Building & Safety fee stack typically lands $16K–$26K all-in: plan check, building permit, school impact (when triggered), sewer capacity, and energy compliance review. The single biggest variable is utility capacity — SoCal Edison territory — service upgrades typically 4–6 wks.What is the per-square-foot price for a ADU in Compton?
Honest 2026 pricing for a ADU in Compton runs $300–$355 installed. Smaller footprints carry a higher $/sqft because fixed costs (kitchen, bath, utility tie-ins) spread over fewer feet. Bids that come in 20% under this band almost always exclude site work, Title 24, or impact fees — ask for a line-item breakdown before you compare.How can I make a ADU in Compton cheaper without compromising quality?
Four levers actually move the number in Compton: (1) use pre-approved standard plans where the jurisdiction publishes them — cuts plan check 30–45 days and trims design fees; (2) keep the footprint rectangular — every jog adds $3K–$6K of framing and roof complexity; (3) specify workhorse-tier finishes (LG STUDIO, Bosch 500, KraftMaid) instead of paid-name luxury — same daily UX at 35% lower spend; (4) sequence socal edison territory — service upgrades typically 4–6 wks early to avoid schedule penalties.How long does a ADU permit take in Compton?
Compton Building & Safety runs plan check 70–120 days on a complete, code-conformant submittal for a ADU. First-cycle approvals depend on three things: a stamped structural set, a Title 24 energy report bound into the package, and a site plan with verified setbacks. Most slippage comes from missing one of those three on first submittal.Why do ADU permits get rejected in Compton?
In Compton, the five most common first-cycle corrections are: (1) Title 24 energy compliance not bound to the submittal, (2) site plan setback math off by inches, (3) structural calcs not stamped by a CA-licensed engineer, (4) utility load calculations missing for the panel upgrade, and (5) drainage/grading not addressed for impervious-surface adds. Fixing all five before submittal cuts 70–120 days off the schedule.Does state ADU law override Compton rules for my ADU?
For qualifying ADU and JADU scopes, California Government Code §65852.2 and §65852.22 preempt most local discretionary review — Compton cannot impose owner-occupancy requirements (banned by AB 976), most parking minimums near transit, or stylistic design review. Local jurisdictions still control building-code application, Title 24, utility connection, and impact fee schedules. Non-ADU scopes (full additions, remodels, hillside builds) remain fully under local control.Are pre-approved standard plans available in Compton for a ADU?
Where Compton has adopted a pre-approved standard ADU plan program, using one cuts plan check by 30–60 days and removes the structural review fee. For programs that exist (LADBS, San Jose, San Diego), the trade-off is that floor-plan changes void the pre-approval. Most owners are better off using a standard plan as a starting point and accepting the layout it ships with.How long does a ADU take in Compton from start to finish?
End-to-end for a ADU in Compton: feasibility + design 6–10 weeks, Compton Building & Safety plan check 70–120 days, construction 16–22 weeks, inspections + closeout 2–3 weeks. Realistic total: 9–14 months with a competent team and clean submittals. Add 6–12 weeks for socal edison territory — service upgrades typically 4–6 wks..What is the actual construction schedule for a ADU in Compton?
Once permits issue in Compton, a ADU runs roughly: mobilization 1 wk, foundation 2–3 wks, framing + dry-in 3–4 wks, MEP rough 3 wks, drywall + finish 5–7 wks, inspections + punch 2 wks. The largest single source of slippage is inspector scheduling; the second is finish-material lead time (60–90 days on premium tile, 8–12 weeks on imported windows).Is there a fast-track path for a ADU in Compton?
Compton Building & Safety doesn't run a paid fast-track for residential work, but submittal quality compresses the timeline the same way: a fully bound set with stamped structural, Title 24, and verified site plan typically clears in 70 days rather than the upper end. Express service exists at LADBS for certain scopes — confirm eligibility before paying the fee.Does weather affect ADU schedules in Compton?
Most Compton sites lose 5–10 working days a year to weather — Pacific atmospheric-river storms January–March, and red-flag wind days that pause crane work and roof tear-offs. Plan to dry-in (roof on, windows in) before December if the schedule allows; once the building is weather-tight, the finish trades run year-round.