Walk-In Tub or No-Step Shower: What Changes at the Drain
The building difference comes down to the drain. A walk-in tub set where the old tub was, on the same piping, can stay on the maintenance side of New Jersey's construction code, while a curbless or walk-in shower that moves the drain or valve piping is a plumbing alteration with a permit and a licensed plumber. Which one suits the person is theirs to decide, ideally with their doctor or an occupational therapist.
Where the permit line falls in a bathroom
New Jersey's construction code draws the line at the piping, not at the product. Under N.J.A.C. 5:23-2.7(c)2, ordinary plumbing maintenance includes replacing faucets, replacing valves including a shower or combination tub and shower valve, and replacing a fixture with a similar fixture provided the piping arrangement does not change. Ordinary maintenance needs no permit, inspection or notice. But N.J.A.C. 5:23-2.7(b) takes the addition, alteration, replacement or relocation of any water supply, drainage, waste or vent piping, and any electrical wiring, off that list. Between the two sits minor work under N.J.A.C. 5:23-2.17A, such as new fixtures in existing space that need no increase in the water distribution system or the house drain, which may start after notice to the construction office with a permit application filed within five business days. Where a bathroom project lands on that scale shapes its timeline and its trades more than the choice of tub or shower does.
What a walk-in tub involves
A walk-in tub goes where the old tub was, and when it connects to the same drain and supply without changing the piping arrangement, it can sit on the fixture replacement side of the line. Two things can move it across. If the model needs a new circuit for a heater or pump, that is electrical wiring, which the code takes out of ordinary maintenance and which needs a licensed electrician. And if the drain or supply has to move to suit the new tub, it becomes a plumbing alteration. On paying for one, the facts are not encouraging: the VA's HISA benefit lists spa or jetted tubs among its excluded alterations, and Medicare's equipment reference list marks bathtub lifts and bathtub seats as denied. Ask whoever quotes a walk-in tub to say in writing whether the piping or wiring changes, because that one answer tells you whether a permit is involved.
What a curbless shower involves
A curbless or low-threshold shower usually means taking the tub out and building a shower floor that meets the bathroom floor, which in most houses moves the drain, the valve or both. That is a plumbing alteration: a permit, and under N.J.A.C. 5:23-2.15 plumbing done by a licensed plumber, named with a license number on the permit application, unless a single-family homeowner does it on their own house. For the dimensions, the U.S. Access Board's guide to ADA bathing rooms is a sensible reference: it permits a roll-in shower threshold of up to half an inch if properly beveled, prefers trench drains and other designs that give a flush transition, and where there is no seat calls for grab bars on three walls, with controls at least 1 1/2 inches above the grab bar. The Access Board is also clear that the ADA does not apply to single family homes, so those figures are guidance for your bathroom, not a legal requirement on it.
How the two compare on paying for the work
The programs that help pay toward bathroom changes in New Jersey tend to describe showers rather than tubs. The VA's HISA benefit names roll-in showers among the essential lavatory and sanitary facilities it provides for eligible veterans, and lists spa or jetted tubs as excluded. New Jersey Medicaid's residential modifications service names modifications of bathrooms among the adaptations a member's plan of care can require, up to $15,000 over a lifetime and through a provider the member's managed care plan has credentialed. IRS Publication 502 lists support bars and other bathroom modifications among the improvements whose reasonable cost can count as a medical expense above 7.5% of adjusted gross income. None of that means a program will pay for your bathroom. It does mean the choice between a tub and a shower can change which doors are open, so check before the design is settled.
When the existing tub can stay
Sometimes neither is needed. If the tub works and the hard part is getting in, out and steady, the CDC's home safety checklist advises grab bars next to and inside the tub and next to the toilet, and grab bars, a shower seat and a handheld shower all sit on the maintenance side of the code. That can be an afternoon's work for a capable relative, with no permit and no contractor from us. If the bathroom does need rebuilding, send us photos of it, which floor it is on, whether there is a second bathroom in the house, and any date you are working to. We connect you with a registered local contractor, licensed and insured for the plumbing the job needs, who builds the kind of bathroom you are asking about rather than selling one product.
Sources used in this guide
N.J.A.C. 5:23-2.7(c)2 lists as ordinary plumbing maintenance the replacement of faucets, the replacement of valves including shower or combination bath and shower valves, and the replacement of fixtures with a similar fixture provided that no change in the piping arrangement is made.
Source: New Jersey Administrative Code as published by the New Jersey Office of Administrative Law, via New Jersey Department of Community Affairs, accessed 2026-09-22
N.J.A.C. 5:23-2.7(b) states that ordinary maintenance does not include cutting away any loadbearing wall or partition, removing or cutting any structural beam or bearing support, any work affecting structural or fire safety, or the addition, alteration, replacement or relocation of any water supply, sewer, drainage, gas, soil, waste, vent or similar piping, or of electrical wiring.
Source: New Jersey Administrative Code as published by the New Jersey Office of Administrative Law, via New Jersey Department of Community Affairs, accessed 2026-09-22
Under N.J.A.C. 5:23-2.17A, minor work may start without a permit, but the owner or contractor must give the enforcing agency notice before work begins and file a permit application within five business days. Minor work includes renovation or alteration of an existing one- or two-family dwelling where no primary structural members are altered, replacement of existing plumbing piping with like capacity, new fixtures in existing dwelling space that need no increase in the water distribution system or house drain, and up to five new outlets where existing circuits are adequate. Inspections must be performed within three business days of a request.
Source: New Jersey Administrative Code as published by the New Jersey Office of Administrative Law, via New Jersey Department of Community Affairs, accessed 2026-09-22
N.J.A.C. 5:23-2.15 provides that plumbing, electrical, and heating, ventilating, air conditioning and refrigeration work shall not be undertaken except by persons licensed to perform it, except in the case of a single-family homeowner on his or her own dwelling, and the permit application must carry the name and license number of each such contractor. If the work involves a home improvement by a contractor, the contractor's Contractors' Registration Act number must appear on the permit application.
Source: New Jersey Administrative Code as published by the New Jersey Office of Administrative Law, via New Jersey Department of Community Affairs, accessed 2026-09-22
The U.S. Access Board's guide to the ADA Standards states that the ADA does not apply to individually owned or leased housing in the private sector not used as a public accommodation, including single family homes, condominiums, or apartments.
Source: U.S. Access Board, Guide to the ADA Accessibility Standards, Chapter 1, accessed 2026-09-22
The Access Board's guide to ADA bathing rooms says a roll-in shower threshold of up to 1/2 inch is permitted if properly beveled, and notes that trench drains and other designs allowing a flush transition are preferable. Where a roll-in shower has no seat, grab bars are required on three walls, and shower controls must be at least 1 1/2 inches above the grab bar.
Source: U.S. Access Board, Guide to the ADA Accessibility Standards, Chapter 6: Bathing Rooms, accessed 2026-09-22
The VA Home Improvements and Structural Alterations (HISA) benefit, administered by Prosthetic and Sensory Aids Service, provides medically necessary improvements to a Veteran's primary residence, including entrance and exit access, essential lavatory and sanitary facilities such as roll-in showers, lowered counters and sinks, permanent ramping, and plumbing or electrical changes needed for home medical equipment. The VA lists a $6,800 lifetime benefit for the categories it names. Excluded alterations include exterior decking, spa or jetted tubs, removable equipment such as portable ramps, porch lifts, stair glides, and routine repairs.
Source: U.S. Department of Veterans Affairs, Prosthetic and Sensory Aids Service, accessed 2026-09-22
The Medicare National Coverage Determination Durable Medical Equipment Reference List (NCD 280.1) lists grab bars as denied, a self-help device not primarily medical in nature; stairway elevators as denied, referring to elevators, a convenience item; bathtub lifts and bathtub seats as denied; raised toilet seats as denied; and toilet seats as denied, not medical equipment.
Source: Centers for Medicare and Medicaid Services, Medicare Coverage Database, NCD 280.1, accessed 2026-09-22
The NJ Department of Human Services Division of Medical Assistance and Health Services Housing Supports Services Dictionary defines Residential Modifications and Remediation Services as physical adaptations to a member's private, primary residence required by the plan of care, including ramps and grab bars, widening of doorways and modifications of bathrooms. The service is limited to $15,000 lifetime, excludes modifications of general utility, excludes public areas of communities governed by a homeowner association, and requires the provider to be approved and credentialed by the member's managed care organization. For a home not owned by the member, the owner must approve in writing.
Source: New Jersey Department of Human Services, Division of Medical Assistance and Health Services, Housing Supports Services Dictionary, accessed 2026-09-22
IRS Publication 502 (for 2025 returns) says improvements made to accommodate a home to a disabled condition don't usually increase the value of the home and their cost can be included in full as medical expenses. Its list includes constructing entrance or exit ramps, widening doorways and hallways, installing railings, support bars or other bathroom modifications, installing porch lifts and other lifts (but elevators generally add value to the house), modifying stairways, adding handrails or grab bars anywhere, and grading ground for access. Only reasonable costs count, not additions for architectural or aesthetic reasons, and medical expenses are deductible only above 7.5% of adjusted gross income.
Source: Internal Revenue Service, Publication 502, Medical and Dental Expenses, accessed 2026-09-22
CDC's Check for Safety home fall prevention checklist advises having grab bars put in next to and inside the tub and next to the toilet, making sure handrails are on both sides of the stairs and as long as the stairs, and having an electrician put in an overhead light and a light switch at the top and bottom of the stairs.
Source: Centers for Disease Control and Prevention, STEADI, Check for Safety: A Home Fall Prevention Checklist for Older Adults, accessed 2026-09-22
Services this guide relates to
Need someone to look at it?
Send the details and we will come back to you.