BATHROOM REMODELING IN MISSION VIEJO, CA

It helps to know which of these groups your project falls into before you talk to Building Services:

• Finish work, such as paint, a new mirror or new towel bars. Check the city's Work Exempt from Building Permits document rather than assuming no permit is needed.
• Fixtures replaced where they are: a toilet, faucet or showerhead swapped in place. Ask Building Services whether the swap needs a permit.
• Plumbing that moves: a relocated drain, a rebuilt shower with a new valve, or a tub-to-shower conversion. Plan on a permit, and read the Residential Bathroom Remodel 2026 handout first.
• New electrical work: a heated floor, an added outlet, new lighting or an exhaust fan circuit. The city publishes Residential Electrical Requirements.

• City of Mission Viejo: Work Exempt from Building Permits (opens in a new tab)
• City of Mission Viejo: Residential Bathroom Remodel 2026 (opens in a new tab)
• City of Mission Viejo: Residential Electrical Requirements (opens in a new tab)
• City of Mission Viejo: Client Self Service (opens in a new tab)

We have relied on the titles of these city documents, not on their contents. Confirm with Building Services which permit your bathroom needs before demolition starts.

A bathroom is where California's water-conservation law shows up most directly. Civil Code Section 1101.4, added by SB 407 in 2009, says that for building alterations or improvements to a single-family home built on or before January 1, 1994, replacing noncompliant plumbing fixtures with water-conserving ones is a condition of final permit approval. Section 1101.3 defines what counts as noncompliant:

• A toilet that uses more than 1.6 gallons per flush.
• A showerhead with a flow capacity of more than 2.5 gallons per minute.
• An interior faucet that emits more than 2.2 gallons per minute.

Two other state codes apply as well. The 2025 Energy Code (Title 24, Part 6), in effect for permit applications from January 1, 2026, has residential lighting rules in Section 150.0(k): new installed lighting is to be high efficacy, and at least one installed luminaire in each bathroom is controlled by an occupancy or vacancy sensor that turns it off automatically. The 2025 California Electrical Code calls for ground-fault (GFCI) protection on bathroom receptacles, and bathroom receptacles are supplied by a 20-amp branch circuit.

An exhaust fan, a relocated shower valve or a new circuit can each bring their own permit and inspection. What applies to your bathroom is decided by the city at plan check and inspection, so confirm with the city.

Building Services posts a form that names the bill behind the fixture rule above: the Affidavit for Water Conservation SB 407. SB 407 added Civil Code Section 1101.4 in 2009. If your home was built on or before January 1, 1994, ask the city whether your permit calls for the affidavit, and take stock of every toilet, showerhead and faucet in the house, not only the ones in the bathroom being remodeled.

The city also posts a Smoke and Carbon Monoxide Alarm Self Certification. Ask whether your bathroom permit calls for it, so the alarms are sorted out before the final inspection is requested.

• City of Mission Viejo: Affidavit for Water Conservation SB 407 (opens in a new tab)
• City of Mission Viejo: Smoke and Carbon Monoxide Alarm Self Certification (opens in a new tab)

If your home is in a homeowners association that requires approval for physical changes, Civil Code Section 4765 sets the ground rules for that review: the association's decision is to be in writing, and a disapproval has to explain why and describe how to ask for reconsideration. HOA approval and a city permit are separate. One does not replace the other.

Even when nothing changes outside, an association may set rules for when crews work, where they park and where a debris bin can sit. A new exhaust fan cap or a replaced bathroom window can be visible from outside, so ask about those too.