Flat Roof Replacement cost: Janesville vs Madison (2026)
In 2026, flat roof replacement is about 3% less expensive in Janesville than in Madison. Most homeowners pay around $10,050 in Janesville versus $10,350 in Madison — a gap of roughly $300.
Janesville WI
Lower costTypically around $10,050
Madison WI
Typically around $10,350
Janesville vs Madison: full breakdown
| Factor | Janesville | Madison |
|---|---|---|
| Typical 2026 cost | $10,050 | $10,350 |
| Estimated range | $5,150–$14,950 | $5,300–$15,350 |
| Labor index (vs US) | ×0.95 | ×0.98 |
| Climate zone | Cold | Cold |
| Climate factor | ×1.03 | ×1.03 |
| Local permit | $250 | $275 |
| Labor share | $6,050 | $6,200 |
| Materials/equipment | $4,000 | $4,150 |
All figures are 2026 localized planning estimates for flat roof replacement — get an actual quote before you commit.
How much should this gap actually matter?
3% is within noise for flat roof replacement — contractor selection and timing move the price more than which of these two metros you're in.
Flat roof replacement by type: Janesville vs Madison
Below, each flat roof replacement option is priced independently for both cities, with identical local labor, climate and permit logic applied — so the comparison holds up.
| Type | Janesville | Madison |
|---|---|---|
| EPDM (rubber) | $5,150–$12,000 | $5,300–$12,350 |
| TPO | $6,150–$13,000 | $6,300–$13,350 |
| PVC | $7,100–$14,950 | $7,300–$15,350 |
| Modified bitumen | $5,150–$11,050 | $5,300–$11,350 |
| Built-up roofing (BUR) | $6,600–$14,000 | $6,800–$14,350 |
Flat roof replacement numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
Flat roof replacement by roof size: Janesville vs Madison
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 | Janesville | Madison |
|---|---|---|
| 1,000 sq ft (10 squares) | $4,150–$8,600 | $4,300–$8,800 |
| 1,500 sq ft (15 squares) | $5,150–$11,050 | $5,300–$11,350 |
| 2,000 sq ft (20 squares) | $6,150–$14,000 | $6,300–$14,350 |
| 2,500 sq ft (25 squares) | $7,600–$15,950 | $7,800–$16,350 |
| 3,000+ sq ft (30 squares) | $9,100–$18,900 | $9,300–$19,400 |
All figures are 2026 localized planning estimates for flat roof replacement — get an actual quote before you commit.
Cheapest time for flat roof replacement in either city
Shingles need warm, dry weather to seal, and demand peaks after summer storms. Booking in the slow late-fall/winter window for a spring install often earns you off-season pricing.
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 risk case
Nail down the per-sheet decking rate in writing before anyone climbs up. Soft or rotted plywood is the most common mid-job discovery, and without an agreed number the crew names the price after they've already found the damage — turning a cheap quote into an open tab.
The do-it-right case
Skipping the tear-off means burying whatever's failing underneath, and a second layer bakes the shingles from below until they curl early. Doing it properly means stripping to the deck, then paying for real underlayment, flashing and airflow — the work that sets how long the roof lasts, not just how it looks the first week.
The value case
Architectural shingles sit between bargain 3-tab and premium metal or tile, and for most houses that middle ground is exactly right. They carry longer wind and wear ratings than 3-tab for a small step up in price, without the four-figure jump metal or tile demands.
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.
Janesville vs Madison
Is flat roof replacement cheaper in Janesville or Madison?
Janesville wins on price: flat roof replacement runs about $10,050 there versus $10,350 in Madison, a gap of roughly $300 (3%) as of 2026.
Why does flat roof replacement cost more in Madison than Janesville?
Madison's higher labor index (0.98 vs 0.95 in Janesville) is the biggest factor, with the cold/cold climate split and permit fee differences playing a smaller role.
How much is flat roof replacement in Janesville, WI?
flat roof replacement in Janesville runs $5,150–$14,950 as of 2026 — most jobs land near $10,050.
When is the cheapest time to buy flat roof replacement — and does it differ by city?
It doesn't vary by location — Late spring to early fall (dry, 45–85°F) is the discount window in both Janesville and Madison (roughly 5–10% off), while mid-winter and the post-storm rush tends to be the most expensive in either city.
Should I choose where to live based on flat roof replacement cost?
Not really — the $300 gap is one-time, and smart timing and tighter quotes in Madison can shrink it. Factors that compound over time, like energy prices and home condition, deserve more weight than a single upfront difference.
Compare flat roof replacement in other cities
Updated June 2026 · By Serhat Özçelik