Township brief
Northfield Township, measured.
24,744 residential parcels on the official record. Median home built 1969. Every figure below is computed from the county assessor's file, county roof permits, FEMA + First Street flood layers — aggregate only, and never a claim about any specific property.
24,744Homes on the county recordAssessor
1969Median year builtAssessor
1,569Homes with a roof permit on file (6.3%)County permits
19,500–20,000Homes 25+ yrs old with no roof permit on fileDerived · estimate
The stock
What Northfield's housing is made of.
64.7% of Northfield's homes predate 1980. 88.9% carry asphalt-shingle roofs, 26.6% are masonry-walled (not a siding market), and 90.7% have a full or partial basement. 91.6% are owner-occupied.
Flood exposure: 200 homes sit in a FEMA Special Flood Hazard Area, while 1,113 (4.5%) carry a First Street flood factor of 5+ — water risk beyond the mapped floodplain.
The read for contractors
The 19,500–20,000 homes at 25+ years with no roof permit on file are where Northfield's replacement cycle is furthest along — that cohort, minus fresh permits, is the campaign surface.
Stock profileAssessor · county permits
Re-roof waves
Northfield's permit history has a shape.
Roof permits in Northfield cluster into waves — the county file shows the biggest recent years to the right. Homes that didn't replace during a wave are aging on the same clock as the neighbors that did.
The read for contractors
Campaign the non-replacers inside a past wave's footprint — demand that already proved itself once tends to prove itself again.
Biggest recent permit yearsCounty roof permits
| Year | Roof permits |
|---|---|
| 2023 | 523 |
| 2024 | 502 |
| 2022 | 378 |
Want Northfield scored neighborhood by neighborhood?
This page is the township-level read. The Territory X-Ray ranks every Northfield neighborhood on the full model — roof age and size, storm cohort, permit suppression, ownership — with the first campaign chosen.
Request a Northfield Territory X-Ray