Illinois · 5 modeled metros
Roof Replacement Cost in Illinois
We model a full roof replacement in 5 Illinois metros. A typical job runs from about $11,000 in Peoria to about $13,000 in Chicago. Each figure is the national range for a full roof replacement multiplied by that metro's cost index, so the whole difference between two Illinois cities on this page is the index.
There is no single Illinois number here, on purpose. The model carries an index for each metro, not for the state, and averaging them would invent a figure nobody modeled. Outside these metros the national baseline applies.
Illinois metros side by side
| Metro | Index | Per square, typical | Typical job | Low – high |
|---|---|---|---|---|
| Peoria | 1.00× | $550 | $11,000 | $5,600–$27,000 |
| Rockford | 1.02× | $560 | $11,000 | $5,700–$27,500 |
| Aurora | 1.12× | $615 | $12,500 | $6,300–$30,000 |
| Naperville | 1.14× | $625 | $12,500 | $6,400–$31,000 |
| Chicago | 1.18× | $650 | $13,000 | $6,600–$32,000 |
Modeled estimates, rounded. Job figures assume a 15–30 square roof (20 for the typical case): a complete tear-off and re-roof in architectural asphalt shingle, including underlayment, drip edge, flashing and ridge cap. Each city name opens that metro’s full guide with the arithmetic shown.
Why the Illinois figures differ
Each index is our editorial estimate of where local labor, overhead and permitting sit against the national middle — not a feed of local quotes. Here is the reasoning for each, as stated on its guide.
Peoria1.00 · at the national baseline
A central Illinois market at roughly the national middle for construction labor. Modeled at baseline.
Rockford1.02 · about 2% above the national baseline
A mid-size northern Illinois market outside the Chicago wage band, with costs closer to the national middle. Modeled at or just above baseline.
Aurora1.12 · about 12% above the national baseline
Inside the Chicago metro labor market with slightly lower prevailing costs than the affluent western suburbs. Modeled above baseline.
Naperville1.14 · about 14% above the national baseline
A high-income western suburb inside the Chicago labor market. Wages track the metro, while suburban lots are easier to work than city sites. Modeled above baseline, a little under Chicago itself.
Chicago1.18 · about 18% above the national baseline
A large, high-wage metro with strong construction-trade wage levels, dense urban sites, parking and staging constraints, and substantial permitting and insurance overhead. Modeled well above baseline — the highest index in this dataset.
Who may do the work in Illinois
State license
Illinois has a genuine dedicated state roofing license — one of the few states with a stand-alone roofing licensing act. Under the Illinois Roofing Industry Licensing Act (225 ILCS 335), administered by IDFPR with a Roofing Advisory Board, any person or entity engaging in roofing contracting must hold either a LIMITED license (residential properties of 8 units or less) or an UNLIMITED license (residential, commercial and industrial). There is no dollar threshold. The applicant business designates a qualifying party who must pass the IDFPR roofing qualifying-party examination and be a genuine W-2 employee supervising day-to-day roofing operations. A continuous surety bond of $10,000 (limited) or $25,000 (unlimited) must be filed and maintained, along with $500,000 per-occurrence liability and $250,000 per-occurrence property damage insurance, workers' compensation coverage, and a current Illinois unemployment insurance account. The application fee is $125.
Sources: IDFPR — Roofing Contractor (license page, forms, exam, Act and rules) · 225 ILCS 335 — Illinois Roofing Industry Licensing Act (full text, Illinois General Assembly) · IDFPR Form RF — Roofing Contractor Licensure application (license classes, bond forms BD-LRF/BD-URF, RF-INS insurance minimums, $125 fee) · 68 Ill. Adm. Code Part 1460 — Roofing Industry Licensing rules (JCAR) · IDFPR — License Look-Up · IDFPR — Check a License landing page. Checked August 2026. Full Illinois licensing rules
Storm season and what it does to scheduling
Peak season: April–July. Illinois sits at the eastern edge of the plains severe-weather corridor and takes both discrete supercells and the long-lived, fast-moving straight-line windstorms known as derechos, which can damage roofs across many counties in a single afternoon. Hail and damaging wind are the routine events, and the season is weighted to late spring and early summer. Winter storms are a second, separate season, where snow loading and ice replace uplift as the mechanism.
The weather that generates roofing work here: straight-line wind, hail, tornado, snow load and winter storms. After a regional hail or wind event, local crews are booked for months and prices firm up; the off-season is where scheduling flexibility is worth money.
NOAA’s Storm Events Database records 11,307 county-level severe-weather events in Illinois from 2016 to 2026, including 2,527 hail reports of 1.00 in or larger. The most recent data year is partial. NOAA publishes storm reports on a rolling basis and the final months are still being processed, so a low count in the last year is not evidence of a quiet year. Source: NOAA NCEI
Illinois storm centerSize your own roof before you read a quote
Every number in this guide is priced against roof area, and roof area is not house area. Put your footprint dimensions and your pitch into the squares calculator and you will know how many squares you are buying — which turns a vague estimate into arithmetic you can check against a bid.
Getting a real quote in Illinois
Everything above is a model. The number that decides your budget is a written quote from someone who has been on your roof — three of them, scoped alike, with the per-sheet decking rate written down before the tear-off starts.
Illinois roofing contractors, by city
- ●Read the national guide for the detail. What is and is not in a replacement price, what pushes a job to the top of the band and the component costs are on the national roof replacement cost guide, and each metro guide applies its index to them.
- ●Compare scope, not just totals. The cheapest bid is often the one that left something out.
How we build these cost ranges
The short version: these are industry-typical ranges, not a quote.
For this page: 5 Illinois metros, indexed from 1.00 (Peoria) to 1.18 (Chicago). There is no state-level index.
These are modeled ranges, not quotes
Every figure on this page is an estimate produced by a model, not a price anyone has been charged. We do not collect invoices, we do not receive bid data from contractors, and we do not have a feed of completed jobs. If you need a number you can rely on, the only source of one is a written quote from a contractor who has been on your roof.
Where the national ranges come from
The national baseline for each work type is an industry-typical installed-price band: the range that published cost guides, manufacturer installation literature and ordinary contractor pricing conventions broadly agree on for 2026. Each band is expressed low / typical / high, and where the work is genuinely sold by the square we show the per-square price and the roof size assumptions separately, so the whole-job figure can be re-derived rather than taken on trust.
Where the city adjustment comes from
Each metro carries a single cost index, with 1.00 meaning the national baseline. The index is our own editorial estimate of where local labor, overhead and permitting sit relative to the national middle, based on the well-established general pattern that construction costs run higher in large, high-wage, densely-built metros and lower in smaller ones. It is not a measured price feed, it is not a licensed location-factor dataset, and it is not derived from local quotes. The city figure is simply the national band multiplied by that index.
What we deliberately do not do
We do not publish invented local statistics. There is no "average roof size in your city" on this site, because we have not measured one. Local context here is limited to climate, geography and building-practice factors that are true of the region and that you can verify independently. We would rather be generic and correct than specific and made up.
Why the numbers are rounded
Modeled figures are rounded before display — to the nearest $500 above $10,000, the nearest $100 above $1,000, and more finely below that. A modeled estimate printed to the exact dollar is claiming a resolution it does not have. The rounding is the honest representation of how coarse these estimates really are.
What the model cannot see
It cannot see your pitch, your decking, how many layers are up there, how a truck reaches your house, what your local supplier quoted this month, or how booked the good crews are after the last storm. Those factors routinely move a real quote further than the entire spread between our low and high figures. Treat these ranges as a way to tell a plausible quote from an implausible one — nothing more than that.
A note on this particular topic
The per-job range spans different roof sizes as well as different unit prices, which is why it is wide. A small simple roof at the low unit price and a large steep roof at the high unit price are both real jobs, and they are genuinely five figures apart.
Cost model version 2026.08. Baselines and the regional index are reviewed periodically; the date shown on each page is the date that page's figures were last reviewed. Contractor listings on this site are compiled from public records — confirm any contractor’s license and insurance with your state licensing board before work begins.
Get three quotes in Illinois
Every figure on this page is modeled. A written quote from a contractor who has been on your roof is the only number worth budgeting from.