Do I need a permit for a full bathroom remodel in
Campbell, California?

Campbell bathroom remodel permits — the key details

Campbell requires permits for any full bathroom remodel that involves fixture relocation, new electrical circuits, exhaust fan installation, tub-to-shower conversion, or wall movement. The threshold is clear: if you touch plumbing lines, electrical wiring, or structural framing, you need a permit. The only true exemption is cosmetic work—replacing a faucet, toilet, vanity, or tile without moving drains, supply lines, or outlets. Per IRC M1505 and California Title 24, every bathroom must have mechanical exhaust ventilation ducted to the exterior (not into an attic or soffit); if you're adding or relocating an exhaust fan, the ductwork termination must be shown on your plans. Pressure-balanced or thermostatic mixing valves (required by IRC R2708.3 for anti-scald protection) must be specified on your plumbing plan if you're installing any new shower or tub valve. Campbell's Building Department will not approve a plan that omits this detail.

Electrical work in Campbell bathrooms is heavily regulated because of California's Title 24 energy code and arc-fault protection rules. Per NEC 210.8 and California amendments, all 15- and 20-amp circuits in bathrooms must be GFCI-protected (ground-fault circuit interrupter—the outlet itself or the breaker). In Campbell homes built 2020 onward (and increasingly for retrofits), AFCI (arc-fault circuit interrupter) protection is required on all branch circuits in the bathroom, not just wet-location circuits. If you're adding a new exhaust fan or ventilation duct, you'll need a dedicated 20-amp circuit; most bathroom exhaust fans require 12 AWG wire and a dedicated breaker. Do not underestimate the electrical plan requirements: Campbell inspectors will reject a permit application that doesn't clearly show GFCI and AFCI protection, wire gauge, breaker size, and disconnect switch location (required within 6 feet of exhaust fan per NEC 430.102). An electrical contractor licensed in California is required; owner-builders cannot pull electrical permits in Campbell.

Shower and tub waterproofing is where Campbell's code interpretation diverges notably from some nearby jurisdictions. Per IRC R702.4.2 and California Title 24, any tub-to-shower conversion or new shower installation requires a waterproofing assembly—not just drywall tape and mud. Campbell's inspectors expect to see one of three systems: (1) cementitious backer board (CBU or equivalent) with a liquid-applied or sheet membrane covering all substrate below the finished tile, or (2) waterproofing membrane board system (like Schluter or equivalent), or (3) pre-fabricated waterproof panel (PVC or acrylic). Generic 'moisture barrier' or standard drywall with sealant is not acceptable in Campbell. You must specify the product (brand and type) on your plan; during rough framing inspection, the inspector will look for complete coverage behind all future tile or cladding, including the wall-to-tub junction (which must be sealed per IRC R707.2). Lead paint is a secondary concern: if your home was built before 1978 and you disturb paint (even by demo or sanding), you must hire an RRP-certified contractor or complete EPA RRP training yourself if you're the owner-builder. Campbell does not require RRP paperwork filing, but disclosure and certification are mandatory—do not ignore this for pre-1978 homes.

Drain and vent (DWV) work on relocated fixtures is heavily governed by IRC P2706 (fixture trap arm and vent installation). If you're moving a toilet, sink, or shower to a new location, the drain line must slope at 1/4 inch per foot (minimum) to the main stack, and the trap arm (the horizontal section from the trap to the vent) must not exceed 6 feet in length without an auxiliary vent. Campbell's Building Department will measure trap-arm runs and flag non-compliant installations. If your home is in an older neighborhood (like Rose Garden or downtown Campbell), you may discover that the existing drain stack is in a tight location, forcing you to either add a new secondary vent stack or limit fixture relocation—this is not something you can discover during permitting; it requires a pre-permit plumbing consultation. Vents must exit through the roof; Campbell does not allow auxiliary vents to terminate in attics or soffits per California Title 24 amendments to the IRC. A licensed plumber is required for all DWV relocation work; owner-builders cannot pull plumbing permits in Campbell.

Timeline and inspection sequence in Campbell typically runs 2–5 weeks for plan review, followed by four inspections: (1) Rough Plumbing (after DWV is roughed but before walls are covered), (2) Rough Electrical (after wiring and boxes are installed but before drywall), (3) Framing/Waterproofing (if walls are being moved or shower waterproofing membranes installed—drywall inspection can be combined or waived if no structural changes), and (4) Final Inspection (after all finishes are complete and GFCI/AFCI are tested). Campbell's ePermitting portal allows online status checks and some jurisdictions allow digital photo submission for inspections, but call ahead to confirm. Permit fees for a full bathroom remodel in Campbell range from $250–$700 depending on valuation; the city typically charges 1–2% of project cost (so a $20,000 remodel might incur a $400–$500 permit fee plus plan-review surcharge if revisions are needed). Plan review is included; expedited review (5 business days vs. 10–15) costs an additional $100–$200. Once you pull a permit, the work must start within 180 days and be completed within 6 months; extensions are available for $50–$100 each.

Three Campbell bathroom remodel (full) scenarios

Campbell's Waterproofing Requirements and Why They Matter for Tub-to-Shower Conversions

Campbell's adoption of 2022 California Building Code (which incorporates ICC/ASTM 12921 waterproofing standards) has created a local reputation for strict shower-waterproofing enforcement. The rule stems from historical water-damage claims in older Campbell neighborhoods (Rose Garden, downtown) where post-1970s shower installations relied on paint-grade drywall and sealant caulk—both of which fail within 10–15 years. The IRC R702.4.2 requirement for a waterproofing membrane was added to the code in 2006, but Campbell's Building Department adopted explicit sub-surface documentation requirements that exceed the minimum text. Specifically, inspectors require that cementitious backer board (CBU) be installed with all seams taped and mudded, then overlaid with a continuous liquid-applied or sheet membrane (like Mapei Aquadefense, Schulter Kerdi, or equivalent product with a published waterproof rating ≥10 years). Membrane must extend from the floor to at least 60 inches above the finished floor on all walls, plus 6 inches horizontally onto the subfloor adjacent to the tub curb.

The practical impact is that you cannot spec a generic 'moisture barrier' or rely on grout sealing alone. Your plumbing or remodel contractor must submit the specific product name and installation method with the permit application. Campbell's inspector will look for product documentation (manufacture spec sheet) showing waterproof rating, and will visually verify during rough waterproofing inspection that the membrane covers all CBU joints and wall-to-pan transitions. If the membrane is damaged during tile installation, the inspector can fail the final inspection and require re-sealing—which delays project completion by 3–5 days. For homeowners, this means buying quality materials upfront (CBU + membrane cost roughly $800–$1,200 for a 5-by-8-foot shower) and hiring a contractor who understands California waterproofing standards, not a handyman doing surface-level tile work.

There's a second layer of Campbell-specific concern: the city is in the Santa Clara County Bay Mud zone (lower elevation areas near downtown and Bascom Avenue) where groundwater and soil moisture are higher. Showers that fail waterproofing in these neighborhoods lead to rotting wall framing within 5–10 years—a $5,000–$15,000 remediation. Campbell's Building Department has seen this repeatedly and now treats waterproofing plans as a critical safety item, not a checklist box. If your home is in a bay-mud zone (the city's GIS map shows soil type; you can check your parcel), the inspector may require an even more robust system—e.g., liquid-applied membrane plus sheet membrane (double layer) or a waterproof panel system like Kerdi Board. Plan ahead for this possibility and budget accordingly.

Electrical Code Complexity in Campbell: GFCI vs. AFCI and Why Your Home's Age Matters

Campbell enforces California Title 24 electrical code, which incorporates NEC (National Electrical Code) amendments as adopted by the California Energy Commission. The critical distinction for bathroom remodels is the difference between GFCI (ground-fault circuit interrupter, protective device against wet-contact shocks) and AFCI (arc-fault circuit interrupter, protective device against arc faults that cause fire). Homes built before 2008 in California typically required only GFCI outlets in bathrooms (NEC 210.8 baseline). Homes built 2008–2016 added GFCI requirement for all 15/20-amp circuits in bathrooms. Homes built 2016 onward (like the Scenario C example home in Campbell Hills) require AFCI protection on all branch circuits in the bathroom per NEC 210.12(B) and California amendments—this is not just an outlet; it's a breaker-level protection, meaning your electrical panel must have an AFCI-rated breaker for any circuit serving the bathroom.

Campbell's inspectors are trained to verify code vintage of the home by checking the permit records (homes built in 2017 onward trigger AFCI review). If your plans show only GFCI outlets for a post-2016 home, the inspector will reject the plan and require AFCI breaker installation. This is a common and frustrating discovery during plan review because homeowners and some contractors don't realize the age-based threshold. An AFCI breaker costs $40–$80 more than a standard breaker and requires an electrician to install at the panel, but it's non-negotiable for homes built 2016 onward in Campbell. Additionally, if you're adding a dedicated circuit for an exhaust fan (required by code if you didn't have one previously), that circuit must also be protected—either with an AFCI breaker or, in some cases, an AFCI outlet at the fan location (though breaker is preferred for cleaner design).

A second electrical complexity: the heated towel rack or other permanently hardwired accessories. If you're adding one, it must have its own 20-amp circuit (not shared with general lighting or fans) and must be on a GFCI outlet (or GFCI breaker if the home is post-2016). Some homeowners try to plug a towel rack into an existing outlet, which is not code-compliant; any permanently mounted electrical load in a bathroom must have a dedicated circuit. During plan review, Campbell's inspector will ask to see the circuit serving the towel rack, and if it's shared with other loads, you'll get a revision request. Budget 2–3 hours of electrician time ($200–$400) to add a dedicated circuit if it wasn't planned initially. The lesson: clarify electrical expectations (fans, outlets, hardwired accessories) with your contractor before permitting, not after.

Common questions