Bathroom Remodel Permit in New London, CT (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel in New London requires a permit if you move fixtures, add electrical circuits, install new exhaust venting, relocate walls, or convert tub-to-shower. Surface-only work (same-location fixture swaps, tile, vanity) is exempt.

New London follows the 2020 Connecticut Building Code (adoption of the 2018 IBC), and bathrooms trigger permitting differently than many neighboring Connecticut municipalities depending on scope. The key New London angle: the city enforces mandatory GFCI/AFCI scheduling on all bathroom circuits—even cosmetic vanity replacements in older homes must show GFCI protection on the permit plan, which catches many DIYers off-guard. Additionally, New London's Building Department uses an online permit portal for intake but requires in-person plan review appointments for bathroom work (not over-the-counter)—you'll need to schedule 5–7 days ahead. Exhaust fan termination is stricter here than in some neighboring towns: ducts must exit the building exterior within 10 feet of the fan and cannot be capped with a roof boot alone (must include damper). Cold-climate drainage traps (zone 5A, 42-inch frost line) are also a frequent inspection failure: if you relocate any drain line below grade or near rim joist, the trap arm cannot exceed 4 feet from the trap weir to the vent, and pitch must be 1/4-inch per foot—New London inspectors check this carefully on relocated main-line drains. Pre-1978 homes get lead-paint protocol on top of standard review, adding 1–2 weeks to approval if renovation area exceeds 20 square feet (nearly all full baths do).

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

Stop-work orders in New London carry fines of $250–$500 per day of unauthorized work, plus forced rip-out of unpermitted bathroom systems at your cost (often $3,000–$8,000 for replumbing/rewiring to code).
Homeowner's insurance will deny claims on water damage, mold, or electrical fire originating in an unpermitted bathroom remodel—a single claim can exceed $50,000.
Title disclosure and resale impact: Connecticut Real Estate Transfer Tax requires seller affidavit of unpermitted work; buyers discover it via lender inspection, killing deals or forcing $15,000–$30,000 escrow hold.
New London Building Department can issue violation liens ($300–$600 per violation) that attach to your deed and block refinancing or equity lines until resolved.

New London full bathroom remodel permits — the key details

The threshold for a full bathroom remodel permit in New London is straightforward but strict: if ANY fixture moves to a new location, or if you add electrical circuits, change plumbing vent routing, install a new exhaust fan, remove/relocate walls, or change a tub-to-shower assembly, you must file a full Interior Remodeling permit with the City of New London Building Department. The permit form is available on the city's website and also by appointment at City Hall (620 Bank Street, New London, CT 06320). You'll need to submit two copies of a floor plan showing existing and proposed bathroom layout, a plumbing riser diagram with trap arm length and vent locations, electrical plan showing GFCI/AFCI breaker assignments, and proof of liability insurance if you're using a contractor. The permit application fee is $25–$50, but the permit valuation fee (based on the cost of work) runs $300–$750 for a typical full bathroom remodel valued at $15,000–$35,000. Plan review takes 2–4 weeks; inspections (rough plumbing, rough electrical, framing, final) must be scheduled through the portal or by phone at least 48 hours in advance.

New London's most overlooked requirement is bathroom GFCI/AFCI circuit protection, mandated by the 2020 Connecticut Building Code (which adopts NEC 210.8(A) for all bathroom countertop and general-use circuits). Even if you're only replacing a vanity, the electrical plan must show that the circuit feeding the new vanity is protected by a GFCI breaker at the panel—not just a GFCI outlet in the wall. If your home has an older 15-amp bathroom circuit serving multiple outlets, you may need to upgrade to a new 20-amp GFCI-protected circuit. The code also requires AFCI (arc-fault circuit interrupter) protection on any new branch circuit in the bathroom (NEC 210.12), which often means a dual-function GFCI/AFCI breaker ($60–$100 per breaker). The Building Department will reject plans that don't specify this protection clearly, adding 1–2 weeks to review.

Exhaust ventilation is another common rejection point. New London interprets IRC M1505.2 strictly: any bathroom 5 feet by 8 feet or larger must have mechanical exhaust to the outdoors at a minimum of 50 CFM continuous or 20 minutes per hour of occupancy. The duct must be smooth (no flexible duct runs longer than 10 feet, and any run longer than 6 feet must include an inline damper and support every 4 feet). The duct must terminate outside the building—roof vents are allowed only with a damper and a minimum 12-inch clearance from the roof; wall vents must be at least 3 feet from windows or doors. If you're adding a ceiling exhaust fan in a second-story bathroom above an insulated attic, you must size the duct for your fan (typically 4-inch duct for a 80–110 CFM fan) and slope it 1/4-inch per foot back to the exterior or a condensate drain pan. Many New London inspectors will reject ductwork that isn't sized on the permit plan or that terminates into an attic soffit.

Plumbing and waterproofing rules in New London's Zone 5A climate add complexity. Any relocated drain line must follow trap-arm geometry strictly: the distance from the trap weir to the vent stack cannot exceed 4 feet, and the drain pitch must be 1/4-inch per foot (never negative pitch). For tub-to-shower conversions, IRC R702.4.2 requires a waterproofing assembly—either a cement-board base with a liquid membrane (like Kerdi or RedGard) or a prefab shower pan system—which must be shown on the plan. Many inspectors will stop work if the waterproofing specification is missing. For new showers, a pressure-balanced or thermostatic mixing valve is required (ICC A117.1) to protect against scalding; this must be specified on the plan and installed before framing closure inspection. Also critical in Zone 5A: if your remodel disturbs any exterior wall or rim joist (common in older New London homes), the inspector will verify that new plumbing doesn't compromise the rim board connection or frost line protection (frost depth is 42 inches, and any below-grade drain line must be sloped away from the foundation).

Lead-paint rules apply to all pre-1978 homes in New London. If your remodel disturbs more than 20 square feet of painted surface (nearly all full bathroom remodels do, especially if you're removing walls or tile), Connecticut's lead-safe work practices (CT DEEP, 22a-6k-3) require notification to the Building Department and may trigger lead inspection as part of plan review. This adds 1–2 weeks to the timeline and requires contractors to be EPA lead-certified or the homeowner to complete a lead awareness course. If you're an owner-builder (allowed in New London for owner-occupied homes), you're exempt from contractor licensing but not from lead-paint disclosure or Building Department inspection. Have your plan review appointment ready to discuss whether lead testing or lead-safe dust containment will be required before work starts.

Three New London bathroom remodel (full) scenarios

Scenario A

Master bathroom gut-remodel with relocated toilet, new shower enclosure, and upgraded exhaust fan in a 1950s Cape in the downtown historic district

You're removing the existing bathtub and moving the toilet from the center of the room to the opposite wall to free up floor space. You'll install a new 5-by-8-foot walk-in shower with a frameless glass door, a pressure-balanced valve, and a tile base on a cement-board waterproofing assembly (RedGard). You're upgrading the exhaust fan from a 50-year-old louvered vent to a new 100-CFM inline fan with a 4-inch duct running through the attic to a wall cap. The remodel is valued at $28,000. New London's Building Department will require a full Interior Remodeling permit ($350 permit fee plus application). Your plan must include: (1) floor plan showing toilet relocation with new trap-arm run—the inspector will verify that the new toilet drain line doesn't exceed 4 feet from trap to vent and has proper 1/4-inch-per-foot pitch; (2) plumbing riser showing the shower trap, valve, and vent stack location; (3) electrical plan showing a dedicated 20-amp GFCI-protected circuit for the bathroom (new circuit from panel) with AFCI protection; (4) exhaust duct schematic showing 4-inch duct, inline damper, slope, and wall-cap termination; (5) shower waterproofing detail with cement board and membrane specified (not just 'waterproofed'); (6) pressure-balanced valve spec (e.g., Moen 1225 or equivalent). Because your home is in the downtown historic district (New London's overlay), the Building Department may require a Historic Properties Review if visible exterior work (like the exhaust duct wall cap) is planned—add 1–2 weeks for that review. Lead-paint notification is mandatory (pre-1978 home, >20 sq ft disturbance), adding another 1–2 weeks unless the home has documented lead abatement. Rough plumbing inspection (1–2 weeks after permit), rough electrical (same window), framing/waterproofing (before drywall closure), final inspection. Total timeline: 5–7 weeks. Cost: $350 permit + $3,000–$6,000 contractor labor + $15,000–$22,000 materials.

Scenario B

Second-floor bathroom vanity and toilet replacement in-place, new overhead exhaust fan (no ductwork moved), in a 1980s ranch

You're replacing the vanity with a new 48-inch cabinet and faucet in the same location, replacing the toilet with a low-flow model in the same location, and adding a new ceiling exhaust fan where none existed before (the old bathroom relied on a window). The fan will be a 75-CFM unit with a 4-inch flex duct run through the attic to a roof vent (15 feet of duct). You're not moving any walls, drains, or supply lines. New London's Building Department treats this as a borderline permit case: the vanity and toilet in-place typically don't require a permit (considered appliance replacement), but the NEW exhaust fan duct and electrical circuit for the fan do trigger permitting. You'll need to file an Interior Remodeling permit because you're adding new mechanical ventilation (IRC M1505 compliance). The permit application will be brief: floor plan showing the new exhaust fan location and duct routing (attic to roof vent), electrical plan showing a new 15-amp circuit (likely GFCI-protected from the nearest bathroom circuit, though the fan itself can be on a separate circuit), and the exhaust fan spec. The permit fee will be lower, around $200–$300, because the valuation is lower ($5,000–$8,000 just for the fan and installation). Plan review: 2–3 weeks. Inspections: rough electrical (before duct installation), final (after ductwork and fan are in place). Rough plumbing inspection is NOT required because you're not touching drains. Lead notification is required (post-1980 home, but the work is >20 sq ft if including the ceiling opening)—actually, for a second-floor bathroom with window removal/duct penetration, this is borderline; call the Building Department to confirm if lead notification applies (typically yes). Timeline: 4–6 weeks. Note: if your roof duct termination doesn't include a damper, the inspector will flag it and require a retrofit; many inspectors also want to see the duct sloped slightly back toward the fan to prevent condensation from running back into the fan motor.

Scenario C

Full bathroom gut-remodel in a 2005 suburban colonial with tub-to-shower conversion, all fixtures relocated, and electrical panel upgrade (adding second 20-amp GFCI breaker)

You're completely gutting a 7-by-9-foot bathroom: removing the old tub, moving the toilet to a new wall, relocating the vanity 6 feet to the left, and installing a 6-by-3-foot tile shower with a sloped concrete base, waterproofing membrane, and a pressure-balanced valve. You're adding a new exhaust fan (replacing a broken louvered vent) with ductwork to the outside. You're upgrading the electrical from a single 15-amp circuit serving the vanity and exhaust to a new 20-amp GFCI-protected circuit for the vanity and a separate 15-amp circuit for the exhaust fan (both from a new subpanel or main panel upgrade). The remodel is valued at $22,000. This is a full Interior Remodeling permit case requiring detailed plans. You'll file with the City of New London Building Department: floor plan (existing vs. proposed layout), plumbing riser (all three fixtures with trap arms and vent stack routing), electrical plan (two circuits, GFCI and AFCI breakers shown), exhaust duct routing, and shower waterproofing detail. The tub-to-shower conversion requires IRC R702.4.2 waterproofing spec—concrete base with 6-mil polyethylene vapor barrier plus liquid membrane or a prefab shower pan system (either must be called out on the plan). The toilet relocation is the crux: new rough-in location 6 feet from the current trap, requiring a new branch drain from the main stack or a new 2-inch drain line. The inspector will verify trap-arm length and pitch during rough plumbing inspection. New exhaust fan ductwork must be sized (4-inch for a 75–100 CFM fan) with damper and proper support. Electrical: two dedicated circuits, both with GFCI and AFCI protection per NEC 210.8(A) and 210.12. Permit fee: $350–$450 (valuation $22,000). Lead notification: not required (post-1978 home). Plan review: 3–4 weeks. Inspections: rough plumbing (trap geometry, vent routing), rough electrical (circuit routing, GFCI/AFCI breaker), framing/waterproofing (before drywall closure—inspector will verify cement board and membrane installation), final. Timeline: 6–8 weeks. The most likely rejection point: if the shower waterproofing detail isn't explicitly shown on the plan or if the electrical plan doesn't clearly label both GFCI and AFCI protection, the Building Department will request a revised plan (add 1 week).

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New London's lead-paint protocol and full-bathroom remodeling timeline impact

Connecticut's lead-paint rule (CT DEEP regulation 22a-6k-3) applies to any home built before 1978 where renovation, repair, or painting disturbs more than 20 square feet of painted surface. A full bathroom remodel easily exceeds this threshold—removing old tile, drywall, trim, and cabinets will trigger lead notification to the Building Department. The notification must be filed at least 10 days before work begins; failure to notify can result in fines of $500–$2,000 and project shutdown.

If the building was constructed before 1978 and notification is required, New London's Building Department may conduct a lead inspection as part of plan review or during rough-work stages. The inspection verifies that contractors are using lead-safe work practices (containment, HEPA vacuuming, wet-cleaning, and proper waste disposal). If the home has not been officially lead-abated, the Building Department will require dust-control containment during demolition and cleanup. This adds 1–2 weeks to the overall timeline and typically $2,000–$4,000 to the project cost (for containment setup and certified cleanup).

For owner-builders (homeowners doing their own work), Connecticut exempts you from contractor licensing but not from lead-safe work practices. If you're working in a pre-1978 bathroom remodel, you're responsible for lead notification and compliance. Many owner-builders opt to hire a lead-certified contractor for just the demolition phase ($1,500–$3,000) to avoid fines, then finish the remodel themselves.

Bathroom GFCI/AFCI protection in New London: the inspection trap

New London's Building Department applies NEC 210.8(A) and 210.12 strictly, and it's a major source of permit rejections and re-inspections. The rule: all bathroom countertop circuits must be GFCI-protected, and all new branch circuits in the bathroom must have AFCI protection. Many homeowners assume a GFCI outlet in the wall is sufficient; the Building Department requires a GFCI breaker at the main panel for the entire circuit. This is not optional.

A typical mistake: you replace a vanity and faucet using the existing 15-amp circuit, but the circuit is not GFCI-protected at the breaker. The inspector will request a permit amendment and a new GFCI breaker installation ($60–$100) before final approval. Another mistake: adding a new exhaust fan on the bathroom circuit without AFCI protection; the Building Department will reject the electrical plan and require a dual GFCI/AFCI breaker ($100–$150) instead of a standard GFCI breaker.

If your bathroom has multiple circuits (vanity circuit, exhaust fan circuit, ventilation/lighting), each new circuit needs its own GFCI/AFCI breaker. A full bathroom remodel often requires 2–3 new breakers. At plan-review time, show the Building Department a clear electrical schematic with breaker assignments and protection type (GFCI, AFCI, or dual GFCI/AFCI). During rough electrical inspection, the inspector will verify that the breakers are installed and labeled correctly. This typically delays rough inspection by 1–2 weeks if not caught early.

City of New London Building Department
620 Bank Street, New London, CT 06320
Phone: (860) 437-6200 (Main City Hall line; ask for Building Department) | New London online permit portal (check https://www.ci.new-london.ct.us/ for current portal link or call building dept. for URL)
Monday–Friday, 8:00 AM – 5:00 PM (plan review by appointment; typically 5–7 days ahead)

Common questions

Do I need a permit to replace my bathroom vanity and faucet in the same location?

No permit is required if you're replacing the vanity cabinet and faucet in the same existing location without moving drain or supply lines. However, if the work involves replacing electrical outlets or adding GFCI protection, you should notify the Building Department (optional permit review). If the existing circuit is not GFCI-protected, some inspectors recommend upgrading the breaker even for in-place work; call New London Building Department to confirm for your specific situation.

What's the difference between a GFCI outlet and a GFCI breaker, and which does New London require?

A GFCI outlet is an individual outlet with built-in ground-fault protection (protecting that outlet only). A GFCI breaker protects the entire circuit at the main electrical panel. New London enforces NEC 210.8(A), which requires GFCI protection on all bathroom branch circuits; this is satisfied by a GFCI breaker at the panel. A GFCI outlet alone is not sufficient for code compliance in New London, even though it offers local protection. For a full bathroom remodel, plan for at least one new 20-amp GFCI breaker serving countertop circuits.

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

Standard plan review takes 2–4 weeks from submission. If your plans are missing details (waterproofing spec, exhaust duct routing, GFCI/AFCI breaker assignments, or lead-paint notification for pre-1978 homes), the Building Department will issue a revision request, adding 1–2 weeks. Plan review appointments are required (not over-the-counter) and must be scheduled 5–7 days in advance. Historic district homes or those requiring lead inspection may add another 1–2 weeks.

Can I pull a permit for a bathroom remodel as an owner-builder in New London?

Yes, owner-builders are permitted in New London for owner-occupied homes. You can pull the permit yourself (no contractor license required), but you must obtain the required inspections, follow all codes, and comply with lead-paint notification rules if the home was built before 1978. You'll be responsible for all labor and materials, and the permit fees ($200–$450) are the same. You must be present for all inspections or arrange for your contractor to be there.

What inspection schedule should I expect for a full bathroom remodel in New London?

A typical full remodel requires 4 inspections: (1) rough plumbing (trap arms, vent routing, trap geometry verified); (2) rough electrical (circuit routing, GFCI/AFCI breakers confirmed); (3) framing/waterproofing (if applicable—cement board and membrane installation checked); (4) final (all systems complete, fixtures installed). Each inspection must be scheduled 48 hours in advance. Inspections usually occur within 1–2 weeks of request, though scheduling can extend the project by 2–3 weeks if you don't request them promptly.

Do I need to specify the shower waterproofing system on the permit plan for a tub-to-shower conversion?

Yes, absolutely. IRC R702.4.2 requires a waterproofing assembly for any tub-to-shower conversion. You must specify on the plan whether you're using a cement-board base with a liquid membrane (like Kerdi or RedGard), a prefab shower pan, or another approved system. The plan should include a detail drawing or product spec. If you don't specify the waterproofing system, the Building Department will reject the plan during review. During the waterproofing inspection (usually combined with framing), the inspector will verify that the system is installed correctly.

What's the maximum length allowed for a toilet drain trap arm in New London (Zone 5A)?

The trap arm (horizontal distance from the trap weir to the vent stack) cannot exceed 4 feet per IRC P3201.7. If you're relocating a toilet more than 4 feet from the existing vent stack, you must run a new vent line or move the main vent stack. The drain must also be pitched at 1/4-inch per foot (never negative pitch). New London inspectors verify this during rough plumbing inspection; if the distance exceeds code, you'll be required to reroute the drain, adding cost and delay.

Is a pressure-balanced valve required for a new shower in New London?

Yes, any new shower valve must be pressure-balanced or thermostatic per ICC A117.1 (scald protection). This is a code requirement for all new shower installations. The valve spec (e.g., Moen 1225, Kohler Rite-Temp) must be shown on the plumbing plan. A standard two-handle valve is not acceptable for new work. Failure to specify or install a pressure-balanced valve will result in rough plumbing inspection rejection.

What happens if I start a bathroom remodel without pulling a permit in New London?

If the Building Department discovers unpermitted work (typically via a neighbor complaint or utility work), they will issue a stop-work order and you'll be fined $250–$500 per day. You'll be required to rip out unpermitted systems (often $3,000–$8,000 for plumbing/electrical) and re-pull the permit with double fees. Your homeowner's insurance will likely deny water-damage or electrical-fire claims. If you're selling the home, Connecticut requires disclosure of unpermitted work, which can kill the deal or trigger a $15,000–$30,000 escrow hold. It's far cheaper and faster to pull the permit upfront.

Does the exhaust fan duct need a damper, and where does it terminate in New London?

Yes, all exhaust ducts must include an inline damper (to prevent backflow) and must terminate outside the building with a damper-equipped vent cap. Duct runs longer than 6 feet require an inline damper and support every 4 feet. For roof termination, the vent cap must be at least 12 inches above the roof with a damper; for wall termination, it must be at least 3 feet from windows or doors. Terminating a bathroom exhaust into the attic, crawlspace, or a soffit is not allowed and will fail inspection. If the duct spec is missing from your permit plan, the Building Department will request a revision.

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 New London Building Department before starting your project.

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