Flat Roof Replacement cost: Green Bay vs Janesville (2026)
The two metros aren't quite in sync on flat roof replacement: Green Bay sits 0% below Janesville, or roughly $10,000 versus $10,050 — about $50 apart.
Green Bay WI
Lower costTypically around $10,000
Janesville WI
Typically around $10,050
Green Bay vs Janesville: full breakdown
| Factor | Green Bay | Janesville |
|---|---|---|
| Typical 2026 cost | $10,000 | $10,050 |
| Estimated range | $5,100–$14,850 | $5,150–$14,950 |
| Labor index (vs US) | ×0.95 | ×0.95 |
| Climate zone | Cold | Cold |
| Climate factor | ×1.03 | ×1.03 |
| Local permit | $250 | $250 |
| Labor share | $6,000 | $6,050 |
| Materials/equipment | $4,000 | $4,000 |
Treat these as 2026 localized estimates for flat roof replacement, not quotes from a contractor.
Is the gap worth worrying about?
At 0%, this gap is small enough that it's usually swallowed by normal quote-to-quote variation for flat roof replacement — focus on the contractor, not the city.
Flat roof replacement by type: Green Bay vs Janesville
Each flat roof replacement option, priced separately for both metros — the same local labor, climate and permit adjustments applied per city, so you can compare like for like.
| Type | Green Bay | Janesville |
|---|---|---|
| EPDM (rubber) | $5,100–$11,950 | $5,150–$12,000 |
| TPO | $6,100–$12,900 | $6,150–$13,000 |
| PVC | $7,050–$14,850 | $7,100–$14,950 |
| Modified bitumen | $5,100–$10,950 | $5,150–$11,050 |
| Built-up roofing (BUR) | $6,600–$13,900 | $6,600–$14,000 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national flat roof replacement range for local labor, climate and permits.
Flat roof replacement by roof size: Green Bay vs Janesville
Flat and low-slope roofs are priced per square (100 sq ft) and run about $3–$11 per sq ft installed, depending on the membrane. The roof area is close to the footprint since there's little pitch.
| Size | Green Bay | Janesville |
|---|---|---|
| 1,000 sq ft (10 squares) | $4,150–$8,550 | $4,150–$8,600 |
| 1,500 sq ft (15 squares) | $5,100–$10,950 | $5,150–$11,050 |
| 2,000 sq ft (20 squares) | $6,100–$13,900 | $6,150–$14,000 |
| 2,500 sq ft (25 squares) | $7,550–$15,850 | $7,600–$15,950 |
| 3,000+ sq ft (30 squares) | $9,000–$18,750 | $9,100–$18,900 |
Treat these as 2026 localized estimates for flat roof replacement, not quotes from a contractor.
Cheapest time for flat roof replacement in either city
Shingles seal properly only in warm, dry conditions, which is exactly when everyone else wants a new roof too — especially right after a summer hailstorm. Lock in a late-fall or winter booking for a spring install and you skip that rush.
Where does a smart roofing budget go in 2026?
Before you compare roofing bids, know that the biggest variables are hidden: whether the crew tears off or lays over, what grade of shingle goes down, and what the decking looks like once it's exposed. Each one can shift the total well past the advertised price.
The value case
For a typical home, the architectural shingle is the default that makes sense. It outlasts 3-tab by a wide margin at a modest premium, and it spares you the cost of metal or tile that most roofs never need to justify.
The risk case
Budget for the unknown: rotten decking found at tear-off is the most common surprise. Get the per-sheet repair rate in writing up front so a "cheap" bid doesn't balloon mid-job.
The do-it-right case
A full tear-off lets the crew replace underlayment, flashing and ventilation while the deck is exposed — the layers that actually keep water out. Covering old shingles with new ones costs less on install day, but the trapped heat shortens shingle life, and many manufacturers won't honor a warranty on an overlay.
A roof's real cost shows up over its lifespan, not on install day. Tear-off, a documented repair rate and a mid-tier shingle grade are what keep that lifetime cost in check.
Green Bay vs Janesville
Is flat roof replacement cheaper in Green Bay or Janesville?
Yes — Janesville costs more. Expect around $10,050 for flat roof replacement there against $10,000 in Green Bay, about $50 (0%) apart in 2026.
Why does flat roof replacement cost more in Janesville than Green Bay?
The main driver is local labor rates: Janesville's labor index is 0.95 versus 0.95 in Green Bay. Climate zone (cold vs cold) also shift the total.
How much is flat roof replacement in Green Bay, WI?
flat roof replacement in Green Bay runs $5,100–$14,850 as of 2026 — most jobs land near $10,000.
When is the cheapest time to buy flat roof replacement — and does it differ by city?
Timing doesn't change by city here — Late spring to early fall (dry, 45–85°F) is the cheapest window in both Green Bay and Janesville, saving roughly 5–10%. Avoid mid-winter and the post-storm rush in either location, when emergency replacements push prices up.
Should I choose where to live based on flat roof replacement cost?
Probably not. Yes, $50 is a real gap, but it's a one-time cost you can partly offset in Janesville with off-season timing and tighter bids. Long-term factors like energy prices and home condition matter more than this one number.
Compare flat roof replacement in other cities
Updated June 2026 · By Serhat Özçelik