Seneca Valley School District's 2026-27 budget lists a median homestead with an assessed value of $26,060. The same document puts that home's market value at about $434,500. The gap exists because Butler County still values property in 1969 dollars. That was the year of its last countywide reassessment, and Cranberry Township's own FAQ calls it "one of the oldest base year assessments in the Commonwealth." The county commissioners have now said publicly that a reassessment is a "not too distant" need.
If you're comparing Cranberry with suburbs across the Allegheny County line, the annual tax figure on a listing looks like the firmest number on the page. It actually rests on the least stable base in the comparison.
The Math on a Median Cranberry Home
Three taxing bodies bill a Cranberry Township property. Here are their current rates, applied to Seneca Valley's median assessed value of $26,060:
| Taxing body | Rate period | Millage | Tax on $26,060 assessed |
|---|---|---|---|
| Butler County | 2026 | 27.62 | about $720 |
| Cranberry Township | 2026 | 15.75 | about $410 |
| Seneca Valley School District | 2026-27 | 148.88 | $3,880 |
| Total | 192.25 | about $5,010 |
The county's 27.62 mills for 2026 break down into 21.89 mills for general purposes, 2.93 for Butler County Community College, and 2.80 for debt service. The township's 15.75 mills include a new 2.5-mill Recreational Investment Fund that supervisors approved on Dec. 11, 2025. Seneca Valley's 148.88 mills were adopted on June 8, 2026, an increase of 5.03 mills over the 143.85 mills levied in 2025-26. The school figure in the table is the district's own. The county and township figures are simple multiplication. The total comes before any homestead exclusion, so treat it as an illustration of how the bill is built, not as a quote for any specific property.
Buyers coming from another county tend to fixate on a combined rate near 192 mills. That rate is large because the assessed values it multiplies are small. The state's common level ratio factor for Butler County, effective July 1, 2026 through June 30, 2027, is 16.67. In other words, recorded assessments across the county average roughly 6% of sale prices. Seneca Valley's median example works out to almost exactly that ratio.
Why the Rate Climbs Even When Nothing Is Reassessed
When the assessment base stays frozen, a taxing body can't raise money from rising home values. Its revenue grows from new construction and from rate increases. Seneca Valley's budget includes a ten-year millage history:
- 2017-18: 126.00 mills, or $3,284 on the median assessed value
- 2021-22: 130.45 mills, or $3,400
- 2024-25: 138.32 mills, or $3,605
- 2026-27: 148.88 mills, or $3,880
The district puts its ten-year average increase at 1.94% a year. Butler County commissioner Leslie Osche described the county's side in March 2026. She said tax revenue has grown "just shy of 2%" a year for the past decade because the county is growing, while total expenses are now rising at about 7% against roughly 6% total revenue growth. On a 1969 base, closing a gap like that means raising the rate.
The Ceiling That Could Force a Reassessment
Pennsylvania caps the millage a county like Butler can levy for general purposes at 25 mills. Butler's general-purpose rate is 21.89, which leaves 3.11 mills of room. According to Osche, one mill raises about $2 million for the county, and a 3-mill increase would raise $6 million. Going past the cap requires court approval. When the 2026 budget was adopted on Dec. 17, 2025, she drew the connection directly:
"Seeking court approval for a larger tax increase could result in a countywide property value reassessment."
That quote is the Butler Eagle's paraphrase of her remarks. The 2026 budget avoided a tax increase only after commissioners erased what would have been an $11.76 million deficit, drawing $12.90 million from a $21 million fund balance. Osche said adopting a 2027 budget without a tax increase "will be even more challenging." Last year's budget was introduced in November, so the 2027 budget cycle is close.
The county hasn't committed to anything. At the March 2026 State of the County event, Osche said there is no reassessment timeline yet. Mark Gordon, the county's economic development and planning chief, pointed to price tags in the millions for reassessments in Mercer and Beaver counties. "We don't want to do this in a poorly planned environment," Osche said.
Allegheny County Just Got a Court Date. Butler Doesn't Have One.
The comparison many Cranberry shoppers make is with suburbs just south of the county line, and that comparison changed in August. A state court ordered Allegheny County to reassess after a lawsuit by a homeowner. The county has until 2032 to finish, with reassessments every five years after that.
Allegheny's current system has its own friction for buyers. The Center Square reported that properties there are assessed at about half their value, and that school districts often file appeals when new residents move in, leaving buyers with a doubled tax bill after closing.
So a buyer weighing a Cranberry home against an Allegheny County suburb is comparing a tax base with a court-ordered reset scheduled against one with no timeline. The Allegheny bill is likely to be recalculated within a few years. The Cranberry bill depends on decisions Butler's commissioners haven't made yet.
What a Reassessment Has Looked Like Next Door
Beaver County shows what a reset involves. A county judge ordered a reassessment in 2017, the first since 1982, and the first tax bills on the new values went out in January 2024. The county's total assessed value rose from $2 billion to $15 billion, and its millage dropped from 26 to 3.67. Chief county assessor Joshua Eckelberger said some owners saw their tax bill fall even though their assessment rose 60% or 70%.
That outcome follows from state law. Under 53 Pa.C.S. §8823, in the first year after a countywide reassessment, covered taxing districts must set a rate that keeps their total levy from exceeding the prior year's. They can then vote separately to raise it, but by no more than 10% above the prior-year levy. Seneca Valley falls under a different provision, because the statute excludes school districts covered by the Taxpayer Relief Act's own rules. Overall, a reassessment redistributes the existing tax burden more than it raises it. Individual bills move up or down depending on how far each property's 1969-based value has drifted from its current market value.
Statewide pressure is building too. A Senate bill from Sen. Wayne Fontana that would require reassessment every five years has sat in committee for more than a year. The committee chair, Sen. Dawn Keefer, cites a projected cost of $3.6 million per county and an average completion time of more than two and a half years. Butler Radio reported in August that two other lawmakers plan to introduce a bill requiring reassessment on a 10-year cycle.
Deadlines That Apply Right Now
Until any reassessment happens, Butler County's existing appeal rules apply. Under rules adopted in June 2025, the process works like this:
- Annual appeals are due by 4:30 p.m. on August 1. Mailed appeals count only if postmarked by that date.
- Appeals of a new assessment or a revision made during the year must be received within 40 days of the notice of change.
- Appeals are filed in person at the Butler County Assessment Office, 124 W Diamond Street, Butler, on weekdays from 8:30 a.m. to 4:30 p.m., or by mail to P.O. Box 1208, Butler, PA 16003.
- The Board sends each appellant a hearing date and time at least 20 days in advance.
The August 1, 2026 deadline has passed, so the next annual window closes August 1, 2027. The 40-day window matters more for anyone buying new construction or a home with recent additions, since those generate assessment-change notices during the year.
Common Questions
Why does Cranberry's tax rate look so much higher than rates in other counties? The rate is applied to assessments that average roughly 6% of market value, based on the state's 16.67 factor for July 2026 through June 2027. The dollar amount on the bill is what to compare, not the millage.
Does a reassessment mean higher taxes? Not necessarily for any one property. State law limits first-year levy growth for covered taxing districts, and in Beaver County some owners paid less even after their assessments rose sharply. Individual results depend on how each property's current value compares with its 1969-based value.
Is a Butler County reassessment scheduled? No. As of March 2026, commissioners said no timeline has been set. The county's general-purpose rate is 3.11 mills below its 25-mill cap, and Osche has said that seeking court approval to exceed the cap could lead to a reassessment.
Who sends which bill? Cranberry's FAQ explains that county and township taxes arrive on one combined bill, and Seneca Valley bills separately.
None of this is tax advice. For a specific property, the county assessment record and the current rate sheets are the starting point.
If you're weighing a Cranberry home against one across the county line, The Slivka / Reilley Team can show you the actual assessed values and tax history on the properties you're considering, so you compare dollar amounts rather than millage rates. Start with an Instant Home Valuation, then ask us for the assessment record that goes with it.
