How do I start an Airbnb in Costa Mesa, California?

Costa Mesa generally prohibits short-term rentals. Do not advertise or accept bookings unless the City confirms that documented activity satisfies the narrow legacy home-sharing exception in Ordinance No. 2021-17.

Does Costa Mesa issue short-term-rental permits?

No general permit program legalizes a new short-term rental. The ordinance preserves only narrowly defined home-sharing that began by December 1, 2020, and says the exception does not otherwise establish home-sharing as a permitted use.

What counts as short-term rental activity in Costa Mesa?

The ordinance generally covers a dwelling, unit, room, or bedroom rented for compensation for 30 or fewer consecutive days, whether or not the owner or occupant is present.

What is Costa Mesa’s legacy home-sharing exception?

A natural person may potentially qualify only when renting a primary residence, lawful ADU, or JADU while residing, occupying, and physically present on the property, with compensated home-sharing begun no later than December 1, 2020.

Can I operate an unhosted Airbnb in Costa Mesa?

No. Ordinance No. 2021-17 prohibits short-term rentals other than qualifying home-sharing, which requires the host to be physically present on the property.

Can I use a Costa Mesa ADU as a short-term rental?

The code’s treatment of an ADU or JADU is confined to potential inclusion in the narrow home-sharing definition. That potential inclusion requires association with a qualifying primary-residence host who is physically present and whose compensated activity began by December 1, 2020.

What Costa Mesa lodging tax applies?

Costa Mesa Municipal Code Chapter IV states an 8% transient occupancy tax for covered hotel or motel rent. Confirm whether the exact lawful operation is taxable and obtain current registration and filing instructions from Finance.

How often is Costa Mesa transient occupancy tax filed?

The code requires a return and remittance by the last day of the month following each calendar quarter unless the Finance Department establishes a different reporting period.

How does Costa Mesa enforce its STR prohibition?

A violation is a public nuisance and may be prosecuted as a misdemeanor or enforced as an infraction. The City FAQ says verified violations may result in fines up to $1,000 per day.

Who can help with Costa Mesa STR due diligence?

Code Enforcement can address ordinance and complaint questions, Planning can address zoning and land use, and Finance can address transient occupancy tax. Obtain written, address-specific guidance before relying on rental income.

Costa Mesa, CA Airbnb Guide

Decision point

Costa Mesa STR Investment Decision

Costa Mesa generally prohibits short-term rentals. A purchase should not depend on new Airbnb or VRBO income unless the City confirms that the proposed operation fits the narrow legacy home-sharing exception.

Confirm the parcel is inside Costa Mesa city limits before applying City rules.
Treat an unhosted or whole-home stay of 30 days or fewer as prohibited.
Do not assume a permit application can legalize a new short-term-rental use.
Review longer-term rental, owner-occupancy, or other lawful-use alternatives before acquisition.
Keep acquisition contingencies open until City, title, private-use, and underwriting diligence is complete.

City rule

Costa Mesa STR Eligibility

Ordinance No. 2021-17 prohibits short-term rentals throughout Costa Mesa except a narrow form of preexisting, host-present home-sharing.

The ordinance covers a dwelling, unit, room, or bedroom rented for compensation for 30 or fewer consecutive days.
Qualifying home-sharing must involve a natural person renting a primary residence, ADU, or JADU while physically present on the property.
The host must have commenced compensated home-sharing no later than December 1, 2020.
New home-sharing activity does not satisfy the ordinance’s legacy-date condition.
Advertising a prohibited short-term rental is itself covered by the prohibition.

Verification sequence

Costa Mesa STR Approval Status

Costa Mesa does not offer a general short-term-rental permit that converts a new hosted or unhosted rental into an allowed use.

Read Ordinance No. 2021-17 before relying on platform listings or third-party summaries.
Ask Code Enforcement whether documented activity satisfies every element of the legacy home-sharing definition.
Obtain written parcel-specific guidance when a transaction depends on a claimed exception.
Confirm any separate zoning, building, fire, business, and tax duties identified by the City.
Do not advertise or accept bookings while eligibility remains unresolved.

Operating limits

Costa Mesa Home-Sharing Duties

A potentially exempt home-sharing operation remains tied to the host, primary residence, physical presence, and pre-December 2020 activity described in the ordinance.

Preserve records showing the host is a natural person and the property is the host’s primary residence.
Preserve evidence that compensated home-sharing began by December 1, 2020.
Maintain physical host presence during each stay rather than operating an unhosted rental.
Confirm whether the dwelling, ADU, or JADU is otherwise lawful and safe for occupancy.
Recheck City guidance before changing ownership, occupancy, unit configuration, or operating model.

Tax duties

Costa Mesa Transient Occupancy Tax

Costa Mesa Municipal Code Chapter IV imposes an 8% transient occupancy tax on taxable hotel or motel rent and assigns collection, registration, return, and recordkeeping duties to operators.

Collect the 8% tax when rent is collected and state it separately from rent.
Register with the Finance Department within 30 days after commencing a covered business.
Post the Transient Occupancy Registration Certificate as required by the code.
File returns and remit tax by the last day of the month following each calendar quarter unless Finance sets another period.
Keep records needed to determine tax liability for three years and confirm application to the exact operation with Finance.

Compliance

Costa Mesa STR Enforcement

Operating or advertising a prohibited short-term rental can trigger City enforcement under Ordinance No. 2021-17.

A violation is declared a public nuisance.
The City may prosecute a violation as a misdemeanor or enforce it as an infraction.
The official FAQ states verified violations may produce fines of up to $1,000 per day.
Neighbors and other parties can report suspected short-term rentals to Code Enforcement.
Do not treat continued platform availability as proof that an operation is lawful.

Property review

Costa Mesa Property Underwriting

Underwriting should reflect the Citywide prohibition rather than unsupported revenue, occupancy, ADR, appreciation, or return estimates.

Exclude short-term-rental income unless City-confirmed eligibility is documented.
Model a lawful alternative use and its vacancy, maintenance, management, insurance, and reserve costs.
Review HOA, condominium, deed, lease, lender, and insurance restrictions separately.
Inspect the property and verify permits, unit legality, life-safety work, and deferred maintenance.
Price legal, tax, conversion, and enforcement risk before removing contingencies.

Cost planning

Costa Mesa STR Costs and Contingencies

No standard budget can resolve a use that City law prohibits. Property-level diligence should come before furnishings, launch spending, or platform setup.

Budget for zoning, title, legal, tax, insurance, inspection, and building-record review.
Do not buy furniture or accept reservations before legal-use confirmation.
Model the City’s 8% TOT only where Finance confirms the stay is taxable and the operation is lawful.
Allow for repairs, utilities, cleaning, management, reserves, and lawful-use conversion costs.
Keep a contingency for enforcement exposure if existing operation records are incomplete.

Local contacts

Costa Mesa STR Contacts and Support

Use City departments for current, address-specific answers rather than relying on listings, sellers, or generalized market pages.

Contact Code Enforcement at (714) 754-5623 or CodeEnforcement@costamesaca.gov about suspected violations and ordinance questions.
Contact Planning at (714) 754-5245 for zoning and land-use guidance.
Contact the Finance Department at (714) 754-5241 or revenue@costamesaca.gov for TOT registration and filing questions.
Request written guidance when acquisition depends on a claimed legacy home-sharing exception.
Keep dated copies of City responses, tax filings, registration records, and supporting documents.

Primary sources

Costa Mesa Official STR Sources

The controlling decision should rest on current City law, City guidance, parcel records, and written department responses.

Before waiving acquisition contingencies, plan a Costa Mesa property strategy call to review City prohibition evidence, legacy-exception records, lawful alternatives, property condition, and underwriting inputs.

Costa Mesa Airbnb Rules & Investment Guide (2026)

Costa Mesa Rental Review