California ADU rules · Los Angeles County
Can I Build an ADU in Lynwood?
Yes — you can build an ADU in Lynwood. California's statewide ADU law requires every city, including Lynwood, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
CA state law1 ADU + 1 JADU
At least one ADU and one JADU per single-family lot (a conversion ADU may also be possible).
Units on a multifamily lot
CA state lawConversion ADUs (≥1, up to 25% of units) + up to 8 detached
Conversions of non-livable space (at least 1, or up to 25% of existing units) plus up to 8 detached ADUs on a lot with existing multifamily — never exceeding the number of existing units. JADUs are single-family only.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
CA state law1,200 sq ft
Statewide default cap for detached new-construction ADUs in the absence of a compliant local ADU ordinance. The unconditional by-right floor a city must always allow is 800 sq ft (see Guaranteed minimum size); a city with a compliant ordinance may set its own ceiling.
Max attached ADU size
CA state law50% of the primary dwelling, but ≥850 sq ft (≥1,000 sq ft for 2+ bedrooms) is always allowed
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
Setbacks
Side setback
CA state law4 ft
A city cannot require more than 4 ft side or rear setback; conversions of existing structures are exempt.
Rear setback
CA state law4 ft
Front setback
CA state lawNo front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone
Separation from main house
Local rule10 ft
Lynwood requires a minimum 10-ft wall-to-wall separation between a detached ADU and the primary residence (20 ft if either building is 25 ft or taller; 6 ft to a non-habitable accessory structure). State law sets no separation; a statewide-exemption (≤800 sq ft, ≥4-ft setbacks) ADU need only comply 'to the extent feasible,' and conversions/interior ADUs are exempt.
Parking
Parking required
CA state lawUp to 1 space
At most 1 space per ADU (or per bedroom, whichever is less) — and waived in the common cases below.
Transit parking exemption
CA state lawYes — no parking required near transit & for conversions
No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.
Garage-conversion replacement parking
CA state lawNot required
When a garage/carport is demolished or converted to build an ADU, replacement parking cannot be required.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
CA state lawOnly for a JADU
No owner-occupancy requirement for ADUs (the prior sunset was removed). A JADU may require owner-occupancy, principally where it shares sanitation with the main house.
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
CA state lawBuilding permit
Only a ministerial building permit — no conditional use permit or discretionary design review for a qualifying ADU.
Lynwood-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Objective design standards — match the primary dwelling
Lynwood requires the ADU's architectural treatment to match the primary dwelling and comply with the Lynwood Residential Design Guidelines and the design standards in LMC § 25-20-4.B–G / § 25-20-8.F. Only objective standards may be enforced as approval conditions.
Art in Public Places in-lieu fee
An ADU/JADU with a building valuation greater than $100,000 is subject to Lynwood's 1.5% Art in Public Places in-lieu fee — an extra cost on larger ADU projects not present in most cities.
No short-term rentals (30-day minimum)
Lynwood prohibits short-term rentals; an ADU/JADU may only be rented for terms of at least 30 days, and a recorded covenant enforces this. Building an ADU as a vacation rental is not permitted.
Lynwood does have a local ADU ordinance — a modernized, categorized (A–E) framework in its Zoning Code (LMC § 25-20), not a deferral to state law. It allows a detached ADU up to 1,200 sq ft (16-ft height), one ADU plus a JADU on a single-family lot, and no owner-occupancy for ADUs. The distinctive local rules are a 10-ft wall-to-wall separation between residences, objective design standards requiring the ADU to match the primary dwelling, a 30-day minimum rental term (short-term rentals barred via recorded covenant), and a 1.5% Art-in-Public-Places in-lieu fee on projects valued over $100,000. Verify the current category and subsections with Lynwood Community Development.
Frequently asked questions
Can I build an ADU in Lynwood?
Yes. California's statewide ADU law requires Lynwood to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Lynwood?
A detached ADU of at least 1,200 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Lynwood?
Side and rear setbacks are limited to 4 ft. No front setback may block the mandatory 800 sq ft / 16-ft / 4-ft-setback ADU; otherwise per base zone.
Is parking required for an ADU in Lynwood?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Lynwood?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Lynwood?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Lynwood Mun. Code § 25-20 (Zoning Code, Art. 20 — Residential Districts, ADU provisions)
- Lynwood Mun. Code § 25-20 (Distance Between Structures); City of Lynwood ADU/JADU Guide, Category A
- Lynwood Mun. Code § 25-20-8.F (Design)
- City of Lynwood ADU/JADU Guide, Important Notes
- City of Lynwood ADU/JADU Guide, Short-Term Rentals
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
- Cal. Gov. Code § 66314 (local ordinance standards)
- Cal. Gov. Code § 66315 (owner-occupancy)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated 2026-06-28. This is an AI-assisted summary of Lynwood's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Lynwood Planning before relying on it.
Will an ADU work on your Lynwood lot?
Ask GoCodebook about your address and get the size, setback, parking and permit rules that actually apply to your parcel — with the exact citation.
Check my parcel free