How United Build Partners helps La Mirada homeowners
We're an ADU advisory and contractor-matching service, not the construction company. We start with a free review of your La Mirada property and goals, help you understand how state law overrides certain outdated provisions in the city's own ordinance, and — when it's a good fit — connect you with up to three contractors in our network.
A genuine local wrinkle worth knowing about
What we found in the local code
La Mirada's local ADU ordinance (Municipal Code Chapter 21.54) reads as though Junior ADUs are prohibited outright in the city. In practice, this provision is preempted by California state ADU law, which requires every city to allow a Junior ADU alongside a conversion ADU and a new detached ADU (up to 800 square feet) on an eligible single-family lot — regardless of what the older local ordinance text says. In other words: if you're told a JADU isn't allowed in La Mirada based on the letter of the local code, that's out of step with current state law, and you should confirm the current, controlling rule directly with the Planning Division rather than relying on the ordinance text alone.
ADU rules and permitting in La Mirada
La Mirada's ADU standards build on the same statewide floor every California city follows — ministerial review and a 60-day clock on complete applications, with no owner-occupancy mandate for a standard ADU under the statewide bar on such requirements (see our California ADU laws guide).
What we could confirm for La Mirada
- Size: a detached ADU may reach up to 800 square feet under the city's current published standards; the statewide minimum is 150 square feet.
- Height: generally at least one story and 16 feet.
- Setbacks: a minimum of 4 feet from the rear and interior side property lines for new construction.
- Parking: conversion ADUs and Junior ADUs generally don't require additional parking; attached and detached ADUs generally require 1 space, unless the project qualifies for a standard exemption.
Property and lot considerations
Given the gap between La Mirada's published local code and current state law, it's especially worth confirming directly with the city what's actually available on your specific lot — including your JADU eligibility — rather than relying solely on the ordinance text. A property review can help sort through what applies to your property.
Common ADU types for La Mirada homeowners
Homeowners on standard single-family lots often explore a detached ADU up to the city's 800-square-foot standard. Homeowners with an existing garage often consider a garage conversion instead. A Junior ADU remains available under state law despite the outdated local ordinance language, and is often the lowest-cost path for converting existing interior space.
Cost factors in La Mirada
Construction costs in La Mirada generally track the same range as the rest of our Los Angeles County service area — see our full ADU cost guide.
Financing your La Mirada ADU
Most homeowners fund construction through a HELOC, cash-out refinance, or dedicated construction loan — see our ADU financing overview for how each works.
Rental income and property value in La Mirada
La Mirada's established residential neighborhoods support real rental demand for many homeowners, though actual achievable rent depends heavily on your specific neighborhood and unit — we don't have a verified, current rent figure to quote. See our ADU rental income guide and ROI calculator to work through your own numbers.
How our process works
Frequently asked questions
Generally yes — even though La Mirada's local ordinance text reads as though JADUs are prohibited, that provision is preempted by state law, which requires cities to allow a Junior ADU on an eligible single-family lot. Confirm the current, controlling rule with the Planning Division.
The local ordinance appears not to have been fully updated to reflect current state ADU law, which generally requires every California city to permit Junior ADUs. Where local and state rules conflict, state law generally controls.
Up to 800 square feet under the city's current published standards, with a 150-square-foot statewide minimum.