A full midrange bathroom remodel in the Middle Atlantic region, which includes Hamilton, costs about $30,158, according to the Remodeling 2025 Cost vs. Value Report (www.costvsvalue.com). Nationally, homeowners spent a median of $18,000 on a major remodel of a small bathroom (under 100 square feet) and $30,000 on a larger one in 2025, according to the 2026 U.S. Houzz & Home Study.
Those are the most reliable public numbers for a bathroom near Hamilton. Nobody publishes a Hamilton-only survey, and any contractor quoting you "the Hamilton average" is quoting their own jobs. Below is what the surveys say, what pushes a bathroom above or below them, and how the permit side works in Hamilton Township.
What bathroom remodels cost in 2025
The 2026 U.S. Houzz & Home Study asked U.S. homeowners what they spent on bathroom projects in 2025. It counts a "major" primary bath remodel as one that replaced at least the vanity, countertops and toilet.
| Bathroom size | Median spend | Top 10% spent |
|---|---|---|
| Under 100 sq ft | $18,000 | $44,000 or more |
| 100 sq ft or more | $30,000 | $75,000 or more |
Smaller jobs pull the averages down a lot. Counting every bathroom project of any size, the median spend in 2025 was $15,000 for a primary bath and $7,000 for a guest bath, according to the same study. Those medians include refreshes like a new vanity and paint.
For our region specifically, a midrange bathroom remodel costs about $30,158, according to the Remodeling 2025 Cost vs. Value Report (www.costvsvalue.com). That report prices a defined job: updating a 5-by-7-foot bathroom with a new tub and tile surround, toilet, vanity, tile floor and fixtures.
Small bathroom remodel cost
For a bathroom under 100 square feet, the median major remodel (at least a new vanity, countertop and toilet) cost $18,000 in 2025, and the top 10% of homeowners spent $44,000 or more (2026 U.S. Houzz & Home Study). A lighter refresh costs less: the median guest bathroom project of any scope was $7,000. A powder room with no tub or shower usually sits at the low end, because it has the least tile and plumbing.
Full bathroom remodel cost
A full bathroom has a tub or shower, a toilet and a vanity. The closest published figure is the midrange bathroom remodel in the Remodeling 2025 Cost vs. Value Report: a new tub with a tile surround, toilet, vanity, tile floor and fixtures in a 5-by-7-foot room. It costs about $30,158 in the Middle Atlantic region, according to the Remodeling 2025 Cost vs. Value Report (www.costvsvalue.com). Larger primary bathrooms with a separate shower and a double vanity run higher: the median major remodel of a bathroom 100 square feet or larger was $30,000 in 2025 (2026 U.S. Houzz & Home Study).
What moves the price of a bathroom
- Size and layout. Keeping the toilet, tub and sink where they are is the cheapest path. Moving a drain means new plumbing and a permit.
- How much tile. A tiled floor and tub surround costs far less than floor-to-ceiling tile, a curbless shower and a built-in niche or bench.
- The shower system. A single valve and showerhead is one price. A rain head, handheld and body sprays, plus frameless glass, is another.
- Fixtures and vanity. A stock vanity and a custom one with a stone top can differ by thousands on their own.
- What is behind the walls. In an older house, opening a wall can turn up work nobody could see at the estimate.
Hamilton homes are older than they look
The median home in Hamilton township, Mercer County was built in 1964, and 75% of its 37,628 homes were built before 1980, according to the Census Bureau's American Community Survey (ACS 2024 5-year). That matters for a bathroom in two ways. Older walls and plumbing are more likely to need work once opened. And in a home built before 1978, federal rules require lead-safe work practices when a renovation disturbs painted surfaces (EPA, 40 CFR 745).
| Town | Median year built | Built before 1980 |
|---|---|---|
| Hamilton township, Mercer County | 1964 | 75% |
| Ewing township | 1964 | 72% |
| Princeton | 1965 | 64% |
| Lawrence township (includes Lawrenceville) | 1979 | 51% |
| Hopewell township, Mercer County | 1977 | 53% |
| East Windsor township | 1976 | 60% |
| Plainsboro township | 1986 | 26% |
| West Windsor township | 1990 | 23% |
| Robbinsville township | 1992 | 19% |
Permits for a bathroom in Hamilton Township
Swapping a fixture for a similar one without changing the pipes, or replacing a faucet or shower valve, is ordinary maintenance under N.J.A.C. 5:23-2.7 and needs no permit. Moving a drain or supply line, adding a circuit or changing the layout is not, and needs a construction permit under N.J.A.C. 5:23-2.14.
In Hamilton, permits come from the Hamilton Township construction office at 2090 Greenwood Avenue, (609) 890-3666 (New Jersey DCA roster, as of 2026-09-02).
How long a bathroom remodel takes
Primary bathroom projects averaged 8.4 months of planning and 4.8 months of construction across the U.S. in 2025, according to the 2026 U.S. Houzz & Home Study. Those averages include do-it-yourself projects, which run long. A contractor-run bathroom is set by the scope, the permit and how quickly finishes arrive.
How MHG prices your bathroom
MHG Contracting is a family-owned contractor at 2145 Nottingham Way in Hamilton. Every bathroom gets a free in-home estimate, and the process runs like this:
- A short phone call to hear what you want and set up a visit.
- A first meeting at your house to walk the space.
- A written preconstruction estimate.
- A second pass through the estimate together to settle scope and finishes.
- A deposit, then the final plan, budget and schedule before work starts.
- Week-by-week progress updates while the work is underway.
- A final walkthrough with you before the last payment.
See finished bathrooms in the portfolio, or read about bathroom renovations with MHG.
