Bathroom Remodel Permit in Cerritos, CA (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

Yes — any full bathroom remodel involving fixture relocation, new electrical circuits, exhaust fan work, or wall changes requires a permit from the City of Cerritos Building Department. Surface-only cosmetic work (tile, vanity swap in place, faucet replacement) does not.

Cerritos, unlike some smaller LA County municipalities, enforces full plan review for bathroom remodels that involve structural or system changes — meaning you cannot pull a standard 'bathroom cosmetic' permit and ignore plumbing/electrical upgrades. The city also requires that all bathroom electrical work be performed by a licensed electrician (you cannot do it as an owner-builder), which differs from some neighboring jurisdictions that allow owner-builder electrical under limited circumstances. Cerritos Building Department uses the 2022 California Building Code, adopted locally, and applies it strictly for moisture barriers in showers (IRC R702.4.2 waterproofing assembly certification is mandatory — cement board plus approved membrane or equivalent system must be documented). The city's online permit portal (accessible via the Cerritos city website) allows digital submission, though plan review typically requires in-person or phone clarification. Expect 3–4 weeks for plan review and $300–$700 in permit fees depending on project valuation. The key local twist: Cerritos Building Department will ask for detailed exhaust fan duct routing on the plan (IRC M1505), and they scrutinize trap-arm lengths on relocated drains — this detail often causes plan rejections in the city, so having a licensed plumber draft the schematic saves time.

What happens if you skip the permit (and you needed one)

Stop-work order and $1,000–$2,500 fine if the city or a neighbor reports unpermitted work; you'll be forced to pull a retroactive permit at double the standard fee ($600–$1,400 extra).
Insurance claim denial — homeowner's policies exclude coverage for unpermitted plumbing or electrical work, leaving you liable for repair costs if a water leak or electrical fault occurs post-remodel ($5,000–$50,000+ exposure).
Title transfer and refinance blocking — unpermitted bathroom work must be disclosed on sale or refinance; lenders and buyers often require costly remediation or escrow holds ($10,000–$30,000 contingency).
Removal order — Cerritos Building Department can require full removal and re-installation to code, at your cost, if inspection uncovers major violations like improper waterproofing or missing GFCI circuits ($8,000–$25,000 for redo).

Cerritos full bathroom remodel permits — the key details

The threshold for a permit in Cerritos is straightforward: if you're moving any plumbing fixture (toilet, sink, shower/tub), adding new electrical circuits, installing a new exhaust fan duct, converting a tub to shower (or vice versa), or moving any walls, you need a permit. The Cerritos Building Department applies the 2022 California Building Code, which incorporates the International Residential Code (IRC) by reference. The critical sections you'll hear about are IRC P2706 (drainage fittings and trap sizing — especially important if you're relocating a toilet or sink to a different wall, because the trap arm from the fixture to the main vent cannot exceed 6 feet without additional venting), IRC M1505 (exhaust fan ventilation — requires continuous duct to exterior with no damper on the duct itself, only on the wall cap), IRC E3902 (GFCI protection for all bathroom receptacles), and IRC R702.4.2 (waterproofing assembly for tub and shower enclosures — must specify cement board + waterproof membrane, or equivalent pre-approved system). What often trips up homeowners is that Cerritos requires you to specify your shower waterproofing system on the permit application itself — you cannot just say 'waterproof' and figure it out later. The city will reject plans that don't list the exact product or system (brand and type: e.g., 'Schluter Kerdi waterproofing system' or 'cement board + Redgard membrane'). This is a city-specific enforcement quirk; neighboring Long Beach is less rigorous on this detail.

Electrical work in a Cerritos bathroom remodel cannot be done as owner-builder work — you must hire a licensed electrician. This is a state requirement (California Business and Professions Code Section 7044 allows owner-builder exemptions for certain work, but not for electrical in bathrooms), and Cerritos Building Department enforces it strictly. The electrical plan must show GFCI-protected circuits for all receptacles within 6 feet of the sink or tub, and if you're adding a new exhaust fan or heated towel rack, those circuits must be on a separate AFCI (Arc Fault Circuit Interrupter) breaker or a combination AFCI receptacle. The plan must clearly label which circuit is GFCI and which is AFCI; vague labeling causes rejections. Similarly, plumbing work can be done as owner-builder if you pull a separate plumbing permit, but many homeowners hire a licensed plumber to avoid the complexity and inspection failures. If you do plumbing yourself, know that Cerritos will require you to identify the trap size (typically 1.5 inch for sink, 3 inch for toilet), the trap arm length (max 6 feet to vent or main stack), and the drain slope (minimum 1/4 inch per foot). Incorrect trap arm length is the #1 reason plumbing plans get rejected in Cerritos.

The waterproofing assembly for a tub-to-shower conversion (or new shower enclosure) is the third major code point. If your remodel includes converting an existing tub to a shower, the waterproofing requirements change significantly. Per IRC R702.4.2, the entire shower enclosure wall (floor to ceiling, back wall and sides) must be lined with an approved waterproof material. The Cerritos Building Department accepts either (a) cement board (at least 1/2 inch) with a waterproof membrane (like Redgard, Kerdi, or similar); or (b) pre-fabricated waterproofed systems (like Schluter Kerdi, Durock DensShield, or equivalent). Tile alone does not meet code — the substrate must be waterproof. Many homeowners tile over drywall in existing bathrooms, which is a violation; during remodel, the city will catch this. You must submit the specific waterproofing product with your permit application, and inspectors will verify it during rough framing and before drywall/tile. If you specify tile without a waterproofing membrane below it, the permit will be rejected.

Fixture relocation, especially toilet and sink drain relocation, triggers vent and trap-arm rules. If you're moving a toilet to a different wall, the new drain line must slope downward (minimum 1/4 inch per foot) to the main stack or a secondary vent. The trap arm (the section of pipe between the toilet's trap and the vent fitting) cannot exceed 6 feet in length. If your layout requires a longer run, you must install an additional vent (a secondary vent line to the roof) — this adds cost and complexity. The Cerritos Building Department requires a plumbing schematic showing drain runs, trap arms, and vent lines. If your plan doesn't clearly show these, it will be rejected and you'll need a licensed plumber to redraw it. Sink relocation is less restrictive (trap arm max 12 inches for most sinks under 8 inches diameter, or 18 inches for larger sinks — verify with the code), but the Cerritos plan-review team will measure this and hold you to it.

Finally, the exhaust fan requirement: if you're adding a new exhaust fan or replacing an existing one, it must be ducted continuously to the exterior (roof or wall), with a damper on the wall cap (not in the duct itself). The duct diameter must match the fan output (typically 4 inch for 80 CFM or higher fans), and the duct run should not exceed 25 feet — longer runs lose efficiency. If your duct run is over 25 feet, you need a larger-diameter duct or a booster fan. The Cerritos permit will ask for duct routing details and termination location. Common rejections include ducts terminating into the attic (code violation — must exit to exterior), ducts with no damper, or duct diameter mismatches. Have these details on your plan before you submit. The city will inspect the rough duct installation before drywall, so get it right the first time to avoid costly rework.

Three Cerritos bathroom remodel (full) scenarios

Scenario A

Tile and vanity swap in existing bathroom — no fixture relocation, no new electrical, same drain/vent (Cerritos townhome, cosmetic update)

You're replacing the old tile surround with new tile, ripping out the existing vanity and installing a new one in the same location and drain hole, and maybe swapping out the faucet. The toilet, tub, and exhaust fan all stay in place. This is pure cosmetic work — surface-level renovation with no system changes. Cerritos Building Department does not require a permit for this scope. No permit application, no fees, no inspections. However — and this is critical — if the existing walls behind the tile are just drywall or plaster, and you're removing tile, you're exposing the wall. Before you re-tile, you should install a waterproof substrate (cement board or equivalent) and a waterproof membrane per IRC R702.4.2. This is a gray area: the city won't require a permit for cosmetic re-tiling, but if an inspector happens to see the wall being prepped, they might flag it as code non-compliance if you don't use a proper waterproof assembly under the new tile. To be safe, use cement board and a waterproof membrane even on a cosmetic re-tile; the extra cost is $300–$500 and prevents future moisture damage and potential liability. Total cost for this scope: $2,000–$5,000 (tile, vanity, labor), zero permit fees.

Scenario B

Relocate toilet and sink, new shower valve, add exhaust fan duct — Cerritos single-story home, moving drain lines and adding circuits

You're gutting the bathroom: moving the toilet to the opposite wall (new drain line, new vent requirement), moving the sink to a corner (new supply lines, new drain), replacing the tub with a walk-in shower (new drain, new waterproof assembly, new pressure-balanced valve), and installing a new exhaust fan with ducting. This is a full remodel and absolutely requires a permit. The drain relocation for the toilet is the key trigger — you'll need to run a new 3-inch drain line from the toilet's new location back to the main stack (or install a secondary vent if the run exceeds 6 feet from the existing vent). The sink drain (1.5 inch) must also slope downward and connect to the main drain. The shower conversion triggers the waterproofing requirement: you must submit a waterproofing system (cement board + Redgard, Schluter Kerdi, or equivalent) on the permit plan. The new shower valve must be pressure-balanced (ASSE 1016 or equivalent) — this is code and the inspector will check the rough valve before drywall. Electrical work includes GFCI circuits for the new exhaust fan and any receptacles. The permit will require a plumbing plan (drain/vent schematic), an electrical plan (GFCI/AFCI circuits), and a waterproofing detail (product name and location). Expect to hire a licensed plumber (you cannot do the plumbing permit as owner-builder if you do the fixture relocation — the complexity is too high and Cerritos will likely require licensed work). The Cerritos Building Department will issue a permit application (fee $400–$700 depending on valuation), then conduct plan review (2–3 weeks), then schedule inspections: rough plumbing, rough electrical, framing, shower waterproofing (before drywall), and final. Total timeline: 4–6 weeks from permit issuance to final inspection. Total cost: $8,000–$18,000 (materials, labor, permits).

Scenario C

Add new electrical circuits and GFCI outlets, new exhaust fan, replace tub surround tile in place — Cerritos condo, no fixture relocation

Your bathroom has an old exhaust fan that doesn't duct to the exterior (it terminates in the attic — a code violation), and you want to install a proper ducted exhaust fan. You're also adding new GFCI-protected receptacles (the existing outlets are unprotected). You're re-tiling the tub surround but keeping the tub and toilet in their current locations, and you're not moving the sink. The trigger here is electrical work (new circuits and GFCI protection) and the new exhaust fan duct. You must pull a permit because you're adding new electrical circuits and changing the exhaust fan system. The plumbing portion (re-tiling the surround) is cosmetic and doesn't trigger a separate plumbing permit, but since you're doing electrical, one permit covers both. The electrical plan must show new GFCI circuits for all receptacles within 6 feet of the tub/sink, and the exhaust fan must have its own circuit (typically 20 amp). The duct must run continuously from the fan to the exterior (roof or wall), with a damper on the wall cap. You cannot leave the old vent ducting in the attic — it must be capped or removed. A licensed electrician must pull the electrical permit and do the work; you cannot do this as owner-builder. If you hire an electrician to do the electrical work, they can typically coordinate the exhaust fan duct installation as well, or you can hire an HVAC contractor. The permit fee for this scope is typically $250–$400 (lower than a full remodel because no plumbing fixture relocation). Plan review takes 1–2 weeks. Inspections: rough electrical, exhaust fan duct (before drywall), and final. Total timeline: 2–3 weeks. Total cost: $3,000–$7,000 (electrician, exhaust fan, duct, tile, labor).

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Cerritos waterproofing and shower code — why the city is strict, and what it costs

Cerritos, like all of Los Angeles County, sits in a coastal climate (Zone 3B–3C) with salt spray exposure and occasional heavy rain. The 2022 California Building Code adopted by Cerritos is especially strict about shower and tub waterproofing because moisture intrusion leads to mold, structural rot, and long-term liability. IRC R702.4.2 mandates a waterproof assembly for all shower enclosures. The Cerritos Building Department interprets this to mean a physical waterproof membrane (not just grout) under tile. Cement board alone is not waterproof — you must add a liquid-applied membrane (like Redgard or Aqua Defense) or a sheet-applied membrane (like Schluter Kerdi board or Durock DensShield). The city's plan-review team will ask for the product name and data sheet on the permit application.

The cost of a proper waterproofing assembly is roughly $400–$800 in materials and labor, depending on the shower size. A 5-by-8-foot shower surround (three walls, floor) with cement board and Redgard membrane typically costs $600–$1,000 installed. If you use a pre-fabricated waterproofed panel system (like Schluter Kerdi or Durock DensShield), the cost is similar but the installation is faster and more foolproof. Skipping the membrane and just tiling over drywall (or old tile) is tempting and saves $300–$500 upfront — but it's a code violation and a recipe for hidden mold and water damage. Cerritos inspectors will catch improper waterproofing during the shower waterproofing inspection (which happens before drywall and tile), so you cannot hide it. Get it right the first time.

The waterproofing assembly also includes the shower pan (floor). If you're replacing the tub with a shower and pouring a new pan, the pan must slope (minimum 1/4 inch per foot) toward the drain, and the entire pan floor must be waterproofed (slope pan + mortar bed + waterproof membrane + tile). Alternatively, you can use a pre-formed shower pan (plastic or fiberglass) with a waterproof surround. The Cerritos Building Department accepts both methods. If you go the slope-pan-and-tile route, you'll need a licensed plumber or tile contractor experienced in this method — it's technical and easy to mess up. The pre-formed pan is simpler and more foolproof.

One more detail: if the shower enclosure is larger than 60 inches wide or includes a recessed niche, Cerritos will require additional waterproofing behind the niche (to prevent water pooling). Specify this on the permit plan to avoid a rejection.

Trap arm, vent routing, and drain slope in Cerritos — why your plumber must get this right

When you relocate a toilet or sink in Cerritos, the new drain line must comply with IRC P2706 (trap sizing and trap arm length). For a toilet, the trap arm (the horizontal pipe between the toilet's P-trap and the vent fitting or main drain) cannot exceed 6 feet without an additional vent. If your bathroom layout requires a longer run, you must install a secondary vent line that runs separately to the roof — a costly addition ($800–$1,500). The Cerritos Building Department will measure this on the permit plan and during rough plumbing inspection. A mistake here means a plan rejection and rework.

Drain slope is another critical detail: all drain lines must slope downward at a minimum of 1/4 inch per foot (or maximum 1/2 inch per foot for larger drains). Horizontal runs that are too flat allow water and solids to settle in the pipe, causing clogs. Runs that are too steep (over 1/2 inch per foot) allow water to separate from solids and create air locks and odors. Cerritos inspectors measure slope with a level during rough plumbing inspection. If the slope is off, the line must be re-run — expensive and disruptive after framing is done.

The vent routing is equally important. All fixture drains must connect to a vent stack that runs continuously to the roof or connects to an existing vent stack. If you're relocating a sink or toilet far from the existing main stack, you may need to run a new vent line — another cost and complexity. The Cerritos Building Department requires a clear plumbing schematic on the permit plan showing all drain runs, trap arms, vent connections, and slope direction. Vague or unlabeled sketches get rejected. This is why many homeowners hire a licensed plumber for the permit plan alone ($200–$400) rather than risk a rejection and rework.

In Cerritos townhomes and condos with shared walls, vent routing is often constrained by the shared structure — you may not be able to run new vent lines without hitting the neighbor's wall. In these cases, you need an alternative venting strategy (like a Studor vent or AAV — air admittance valve — though Cerritos has strict rules on when these are allowed). Coordinate with the building management and the city early to avoid discovering a venting conflict mid-project.

City of Cerritos Building Department
18125 Bloomfield Ave, Cerritos, CA 90703
Phone: (562) 916-1200 | https://www.cerritos.us/government/departments-services/building-planning
Monday–Friday, 8:00 AM–5:00 PM (verify for holidays)

Common questions

Can I do the plumbing work myself on a bathroom remodel in Cerritos?

Yes, you can pull a plumbing permit as an owner-builder under California Business and Professions Code Section 7044, but only if the work is on your own property and you're not a licensed contractor. Cerritos will allow owner-builder plumbing permits for fixture relocation and drain line work. However, if the job is complex (long trap arms, secondary venting, major rerouting), the city's plan-review team may recommend hiring a licensed plumber because mistakes are costly. If you do pull an owner-builder plumbing permit, you must inspect the work yourself before rough inspection and fix any code violations. The inspection fee is the same ($100–$150) whether licensed or owner-builder. Many homeowners hire a licensed plumber anyway to avoid inspection failures and rework costs.

Do I need to pull separate permits for plumbing and electrical in a bathroom remodel in Cerritos?

Yes. If your remodel involves plumbing work (fixture relocation, drain lines, new vent), you pull a plumbing permit. If it involves electrical work (new circuits, GFCI/AFCI protection, exhaust fan), you pull an electrical permit. Both can be submitted together in one application, but they are tracked separately by the Cerritos Building Department. The fees are separate as well (typically $150–$250 each, or combined $300–$500 for a full remodel). The inspection schedule is coordinated — rough plumbing and rough electrical are often scheduled on the same day — but they are separate inspections.

What is the most common reason bathroom remodel permits are rejected in Cerritos?

Improper waterproofing specification. If your permit application doesn't list a specific waterproof product (brand, type, and location), the Cerritos Building Department will reject the plan and ask you to resubmit with details. The second most common reason is trap arm length on a relocated toilet or sink — if the plan doesn't show the trap arm measurement and vent connection, it gets rejected. The third is exhaust fan duct termination — if the duct terminates into the attic instead of the exterior, the plan is rejected. Submit a clear plumbing schematic with all drains, traps, vents, and slopes labeled, and a waterproofing product name (e.g., 'Schluter Kerdi system') to avoid rejection.

How long does plan review take for a bathroom remodel permit in Cerritos?

Typical plan review is 2–3 weeks for a full bathroom remodel (with plumbing, electrical, and waterproofing). Simple projects (electrical and exhaust fan only, no fixture relocation) may review in 1–2 weeks. Rejections add 1–2 weeks per cycle if you need to resubmit. Once approved, you receive the permit and can schedule inspections. The full timeline from application to final inspection is typically 4–6 weeks for a full remodel. Expedited review is not available for residential bathroom permits in Cerritos.

Do I need a contractor's license to pull a bathroom remodel permit in Cerritos?

No. Homeowners can pull residential building permits directly without a contractor's license. However, licensed contractors must be hired for electrical work (all electrical in bathrooms) and plumbing work is restricted to licensed plumbers if you want to avoid owner-builder complexity. In practice, most homeowners hire a general contractor or licensed plumber/electrician to pull the permit and do the work, because the detail and code compliance requirements are high. If you pull the permit yourself as an owner-builder (which Cerritos allows for plumbing only, not electrical), you must be present for all inspections and certify the work.

What inspections do I need for a full bathroom remodel in Cerritos?

For a full remodel (fixture relocation, new electrical, exhaust fan, waterproofing), expect 5 inspections: (1) Rough Plumbing — after drain lines, vent, and supply are in place but before walls close; (2) Rough Electrical — after circuits, outlets, and exhaust fan wiring are in place but before drywall; (3) Framing — after walls are framed and openings are sized (if any walls are moved); (4) Shower Waterproofing — before drywall and tile, to verify cement board and membrane are installed correctly; (5) Final — after all work is complete, including tile, fixtures, and trim. Each inspection requires 24–48 hours advance notice. The city will schedule inspections within 2–3 days of your request. Expect 1–2 weeks for the full inspection sequence if no failures occur.

What is a GFCI outlet and why does it matter in a bathroom remodel in Cerritos?

A GFCI (Ground Fault Circuit Interrupter) outlet detects electrical current leaks (like water splashing on an outlet) and cuts power in milliseconds, preventing electrocution. Per IRC E3902, all bathroom receptacles within 6 feet of a sink or tub must be GFCI-protected. This is a code requirement in Cerritos and all of California. In a bathroom remodel, your electrician will either install GFCI outlets (outlets with GFCI built-in) or install a GFCI breaker in the panel that protects an entire circuit. Both approaches are acceptable. The inspector will test the GFCI during rough electrical and final inspection to verify it is functioning. If any receptacle is unprotected, the permit fails final inspection.

If I need to move the toilet, how much does the plumbing work cost in Cerritos?

Relocating a toilet in a Cerritos bathroom typically costs $2,500–$5,000 in plumbing labor and materials, depending on distance and complexity. If the new location is close to the existing main stack (within 6 feet), the work is straightforward: reroute the 3-inch drain line and connect to the existing vent — cost $2,500–$3,500. If the new location is far from the stack and requires a secondary vent line to the roof, add $800–$1,500 for the new vent. Supply line relocation (hot and cold water) is simpler — $300–$800. Excavation or concrete cutting (if you have a slab-on-grade foundation, which is common in Cerritos) adds $500–$1,500. Always get a plumber estimate before finalizing the bathroom layout.

Can I do a tub-to-shower conversion without a permit in Cerritos?

No. A tub-to-shower conversion changes the waterproofing assembly requirement (per IRC R702.4.2) and may involve drain or vent modifications. Cerritos requires a permit if you're removing the tub and installing a shower, even if the drain location doesn't move. The waterproofing system (cement board and membrane, or equivalent) must be specified on the permit plan and inspected before drywall. Unpermitted tub-to-shower conversions are code violations and can trigger enforcement action, stop-work orders, and removal mandates.

What should I include in my permit application for a bathroom remodel in Cerritos?

Submit: (1) a completed building permit application form (available from the Cerritos Building Department website or in person); (2) architectural or plumbing/electrical plans showing new fixture locations, drain and vent routing, electrical circuits, and exhaust fan duct details (scale drawings, not sketches); (3) waterproofing product specification (brand name, type, e.g., 'Schluter Kerdi system' or 'cement board + Redgard membrane'); (4) contractor license numbers (if using licensed plumber/electrician); (5) proof of property ownership or authorization (deed or lease). For owner-builder permits, include a declaration that you are the property owner and that the work will be done by you or your household members. Submit applications in person at Cerritos Building Department or check the city website for digital submission options. Call (562) 916-1200 to confirm current submission methods and required forms.

Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current bathroom remodel (full) permit requirements with the City of Cerritos Building Department before starting your project.

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