Grafton's property tax rate has fallen sharply over the past eight years. Ask most people why, and the answer stops at fiscal discipline: a well-run village board, careful budgeting, a community that doesn't overspend. That answer is comfortable and it is also incomplete. The real driver is growth, and growth is a different kind of story for a buyer to hear, because growth changes what happens to your bill next, not just this year.
Here is the number that gets repeated at open houses and in listing conversations: this year's mill rate sits at $6.24 per $1,000 of assessed value, down 80 cents from last year and $5.03 lower than eight years ago. Village leaders shared those figures at Grafton's State of the Community event in early 2026, alongside a second number that explains the first: the village added $62 million in property valuation last year and collected $1.36 million in permit fees. Village President Dan Delorit told the room that Grafton continues to be a "retail powerhouse," and the math backs him up. A falling rate divided into a growing base is what a tax bill looks like when a town is adding buildings faster than it's adding spending. It is not what a tax bill looks like when a town is cutting costs.
That distinction matters for anyone comparing Grafton to a neighboring village on rate alone, because a rate is only half the equation.
The Part the Rate Doesn't Show You
A mill rate is a levy divided by a tax base. When the base grows faster than the levy, the rate falls, even if your own property's assessed value is climbing right along with it. That's the mechanic buyers need to sit with before they treat "the rate is dropping" as shorthand for "my bill will drop."
In 2025, the Village of Grafton ran a village-wide property assessment revaluation through its contracted assessor, Associated Appraisals. Unlike the village's last revaluation in 2020, this one was done entirely off market data, with no on-site inspections. The stated goal was to bring every property's assessed value in line with what it would actually sell for today. For a home that hadn't been reassessed in years, that can mean a jump in assessed value that outruns the falling rate, so the bill goes up even while the headline number everyone quotes goes down.
The county-level data backs up how uneven that landing can be. Ownwell's tracking of Ozaukee County property taxes puts Grafton's median effective property tax rate at 1.31 percent, above the national median of 1.02 percent though below Wisconsin's statewide median of 1.58 percent. The median annual tax bill in Grafton runs $3,863, well above the $2,400 national median. But that median hides a wide spread: the 25th percentile bill sits around $3,026, while the 90th percentile climbs to $6,686. Two houses on the same rate can carry very different bills depending on where their assessed value landed after the reval and how recently they last changed hands.
Here's the eight-year mill rate arc, worked back from the figures village leaders reported:
| Period | Mill Rate (per $1,000 assessed value) |
|---|---|
| Eight years ago | $11.27 |
| Last year | $7.04 |
| This year | $6.24 |
The rate has been cut nearly in half over eight years. The tax base that made that possible is still under construction.
The Real Growth Engine Sits on Port Washington Road
The single largest piece of that $62 million valuation story isn't a subdivision. It's a hospital.
Aurora Medical Center–Grafton, on the northwest corner of Highway 60 and Port Washington Road, is in the middle of a 125,000-square-foot, five-story expansion that the Grafton Village Board cleared in January 2026. The addition adds 84 new private patient suites and an expanded emergency department to a hospital that already runs 132 beds, 902 physicians, and 568 nurses across 59 specialties. Construction is underway now, with Aurora's own site listing the patient tower as expected to open in 2028.
That timeline is worth sitting with if you're weighing when to buy near this corridor. A hospital doesn't add 84 suites and an expanded ER without adding staff to run them, and staff need somewhere to live. Grafton already carries the infrastructure a relocating physician looks for: a top-ranked hospital, in this case recognized as the No. 3 hospital in Metro Milwaukee by U.S. News and World Report, an "A" patient safety grade from The Leapfrog Group as of fall 2024, and Healthgrades Outstanding Patient Experience Awards for both 2025 and 2026. The expansion doesn't create that reputation. It scales it, on a two-year build timeline that gives anyone tracking the physician-relocation pipeline into this hospital a fairly specific window to plan around.
There's a wrinkle worth knowing here too, because it's the kind of detail that separates a market read grounded in local knowledge from one built off a spreadsheet. When the village board discussed the expansion, Trustee Lisa Uribe Harbeck asked how the addition would affect the payment in lieu of taxes that Aurora makes, since Aurora is a nonprofit and doesn't pay standard property taxes on the hospital itself. That question points to something buyers rarely think about: the anchor institution driving all this valuation growth doesn't directly fund the levy the way a retail strip does. The tax base expansion shows up in the commercial corridor and the residential rooftops that grow up around the hospital, not in the hospital's own footprint. The growth is real. Where it lands on a tax bill is more specific than "the hospital pays for it."
What Grafton's Retail Push Adds to the Same Story
The hospital isn't carrying this alone. Village leaders confirmed that Ollie's Bargain Outlet and Parker John's BBQ and Pizza were approved and expected to open this year, additions to a retail base that's already been expanding for years along Grafton's commercial corridors. Every one of those approvals adds to the $1.36 million in permit fees the village collected last year, and every dollar of new commercial valuation is a dollar that lets the levy get spread across a bigger base, which is the entire mechanism behind that falling rate.
None of this is unique to Grafton in the abstract sense that towns grow. What's specific to Grafton right now is the combination: an institutional anchor adding capacity on a fixed timeline, a retail base still filling in, and a revaluation that just reset the starting line for individual assessed values. Those three things moving together are what's actually behind the number everyone quotes at face value.
What This Means If You're Shopping Here Now
For a buyer weighing new construction, the current market gives a fairly clear read. Builders including Bielinski Homes and Kaerek Homes are active across Grafton's new construction market right now, with developments like Stonewall Farms and Hawks Ridge underway and new construction listings currently running in the mid-$600,000s. That price point sits well above the county-wide effective tax rate math discussed earlier, which is worth factoring in directly: a higher purchase price on a freshly assessed new build means the reval question is largely moot, since new construction gets assessed at current market value from day one. The bigger unknown belongs to resale buyers purchasing homes that haven't turned over since before the 2025 reval, where the gap between old assessed value and new assessed value is the thing to ask about before writing an offer.
For a relocating physician or hospital staff member timing a move around Aurora's 2028 completion, the practical takeaway is that Grafton's growth story isn't waiting for the tower to finish. The retail buildout, the permit activity, and the valuation growth are already underway, which means housing demand near the Highway 60 corridor is more likely to build steadily over the next two years than to spike suddenly at ribbon-cutting. Buying ahead of that completion date, rather than after, is the version of this timeline that tends to work in a buyer's favor.
A Few Common Questions
If Grafton's tax rate keeps falling, does that mean my tax bill will fall too? Not automatically. Your bill depends on your property's assessed value multiplied by the rate. If your home's assessed value rose through the 2025 revaluation or through market appreciation, a lower rate can still produce a flat or higher bill.
Is the mid-$600,000s new construction price typical of Grafton overall? No. That range reflects current builder activity in developments like Hawks Ridge and Stonewall Farms. Grafton's broader housing stock, including older resale homes, spans a much wider range, and Ozaukee County's tax data shows bills as low as the $3,000s at the 25th percentile.
Should I wait until Aurora's expansion opens in 2028 to buy near the hospital? The growth feeding that corridor, retail approvals, permit activity, and valuation gains, is already happening now rather than waiting for the tower's completion. Buyers timing a purchase around the hospital's growth may be better served by acting ahead of 2028 rather than after it.
Grafton's numbers reward a closer read, not a headline glance. If you're comparing this market against another North Shore suburb, or trying to figure out what a specific address's tax history actually means for your offer, Kurtin Realty can walk through the assessment records and the growth pipeline with you, house by house. Request Your Free Home Valuation and let's look at your specific number, not just the village average.
