Denver, CO · Flat Roof

Flat Roof Contractors in Denver, Colorado

Commercial or residential flat roof — compare local roofing companies. 21 local roofers listed.

Short answer: Flat and low-slope roofs in Denver are usually TPO ($5.50–$9 a sq ft installed), EPDM ($4.50–$8) or modified bitumen ($3–$7); the membrane lasts 15–25 years, mostly decided by how well the drains are kept clear. In Denver: 0.3 heavy-rain days a year (1 inch+). Ask any roofer for a license number and a certificate of insurance.

Get a free quote See Denver in numbers
  • 0.3heavy-rain days a year (1 inch+)
  • 18 inrain a year
  • 20days a year at 90°F or hotter
  • 50%of homes are not single-family houses

How much life is left in my Denver roof?

Typical lifespans are published ranges for each material; for a Denver house, real life also depends on installation, attic ventilation and the weather Denver gets.

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Flat roofs in Denver take the hardest hit from freeze-thaw cycling: water that infiltrates a membrane seam freezes, expands, and opens the joint further each winter — heat-welded TPO seams hold up better than taped or adhered laps in this climate. Common flat roof systems in Denver include TPO (heat-welded, energy-efficient), EPDM (durable rubber membrane), and modified bitumen — each with different cost, longevity, and maintenance profiles worth discussing with a local contractor.

Denver in numbers

Public records for Denver and its county, not estimates. Each figure shows its source.

  • #2of 209Denver ranks #2 of the 209 cities we cover for freeze-thaw days.
  • #4of 209Denver ranks #4 of the 209 cities we cover for median home value.
  • #194of 209Denver ranks #194 of the 209 cities we cover for yearly rainfall (low end).
  • #171of 209Denver ranks #171 of the 209 cities we cover for damaging thunderstorm-wind days (low end).

Hail reports per year in the county

Hail events per year in the county, 2017 to 2026* 9 2017 4 2018 17 2019 1 2020 9 2021 1 2022 36 2023 33 2024 1 2025 13 2026*
Hail events per year in the county, 2017 to 2026*
20179
20184
201917
20201
20219
20221
202336
202433
20251
2026*13

124 recorded events across 9 full years plus 2026 to June represented in the data, about 12.3 per represented full year. 2023 had the most events among represented full years: 36.

2026 covers only January to June: NOAA's file ends there, so it is not counted as the worst year or in the yearly average.

Source: NOAA hail events, county level · data as of 2017–2026*

When storms hit Denver

Hail reports by month in the county, all years combined 0 Jan 0 Feb 0 Mar 0 Apr 67 May 72 Jun 25 Jul 3 Aug 1 Sep 0 Oct 0 Nov 0 Dec
Hail reports by month in the county, all years combined
Jan0
Feb0
Mar0
Apr0
May67
Jun72
Jul25
Aug3
Sep1
Oct0
Nov0
Dec0

Most hail reports come in June; the season runs May to July. Book inspections and repairs before that window, not after.

Source: NOAA Storm Events · data as of 2014–June 2026

Roofing trade around Denver

  • 103 roofing companies with payroll in the county, employing about 715 people; 76% have fewer than 5 employees.
  • A roofer's median pay here is $55,830 a year (Denver-Aurora-Centennial, CO Metro Area).
Source: Census CBP · data as of 2023 Source: BLS OEWS, roofers · data as of May 2025

Denver storm record: Denver County

What the National Weather Service logged in Denver County in 2014–2026. County level, because storm reports are filed by county, not by city limits.

  • 1858Founded
  • 5,279 ft (1,609 m)Elevation
  • James W. DenverNamed after
  • Mile High CityNickname

Where hail of 1 inch or more was reported in Denver County

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  • 1161 to 1.74 in
  • 231.75 to 2.74 in, golf ball to tennis ball
  • 12.75 in and up, baseball

Largest plotted stone: 2.75 in. Bigger dots are bigger stones.

140 reports of 1 inch or larger have coordinates. Each dot is a reported location, not a storm path.

Sources: NOAA, Census county outline

Biggest hail days

DateLargest hailReports that dayWhere it was reported
May 30, 2024 2.75 in, about the size of a baseball 32 (Den)Denver Intl Arp
May 8, 2017 2.5 in, about the size of a tennis ball 8 Denver
July 15, 2016 2 in, about the size of a hen egg 7 Glendale
“Severe thunderstorm broke out across Denver and the surrounding metro area and produced large damaging hail, strong winds, heavy rain and flash flooding.”
National Weather Service report, May 8, 2017
Source: NOAA Storm Events Database · data as of 2014–2026

Last big hail on record

June 1, 2026

Hail of 1.75 inches (golf ball) or larger fell on 8 days in 2014–2026. Our records end where NOAA's do, so a newer storm may not be listed yet.

Strongest tornado

EF1 · June 24, 2015

It stayed on the ground for 2.8 miles and was up to 50 yards wide. A tornado touched town near Quebec and 6th Ave and lifted near Mount Nebo Memorial Park. This tornado was a non-supercell tornado. This produced localized convergence and wind shear which likely contributed to the rapid formation of the tornado.

Strongest thunderstorm gust

81 mph · June 6, 2020

What it means for flat roof

Flat and low-slope roofs hold hail on the surface instead of letting it bounce. With 2.75-inch hail on record in Denver County, ask what membrane and cover board the contractor specifies.

Storm data: NOAA Storm Events (public domain). City facts: Wikidata (CC0).

What it costs in Denver

Asphalt-shingle re-roof, 2,000 sq ft home, adjusted for Denver labor and material prices. Your quote depends on roof size, pitch and scope.

That typical price is about 2.1% of the median Denver home value ($586,700).

Source: Census ACS (Denver city) · data as of 2019–2023

Full Denver cost guide by material →

What Denver's climate means for flat roof

  • Denver's freeze-thaw cycling works open membrane seams and flashing laps — heat-welded TPO seams outlast taped or adhered ones in this climate.
  • Under Denver's desert UV, membrane choice and reflective coatings drive lifespan more than anything else — plan on coating renewal to reach full service life.

Roofers in Denver, CO

21 listed, first 20 shown. Roofers we verified against a public registry come first.

This list covers roofing companies generally. Confirm flat roof experience, materials, insurance and current availability with each company. A Verified badge refers to the registry check, not a confirmed specialty.

Flat Roof in Denver: questions

How do I find a flat roof company in Denver?
PickARoofer lists roofing companies serving Denver, CO. This is a general roofing directory; confirm flat roof experience and availability with each company. A Verified badge describes a separate registry check, not a confirmed service specialty or insurance check. Confirm scope, insurance and availability directly. Requests go to one contractor at a time, with up to three attempts; a response or start date is not guaranteed. Free for homeowners.
Will insurance pay for storm-related flat roof in Denver?
Coverage, deductibles and reporting deadlines depend on your policy and circumstances. Document damage safely, contact your insurer promptly and ask for a written repair scope. This directory cannot determine coverage.
When is hail season in Denver?
June is the worst month: 43% of the 168 hail reports NOAA holds for the county came then. Reports run from May to July. Book the inspection before May, while crews still have open dates.
How big does hail get near Denver?
The largest hail NOAA logged near Denver measured 2.75 inches, about the size of a baseball. Hail of an inch or more fell on 31 days in the same record. The biggest day was May 30, 2024, with 32 reports. The National Weather Service calls hail of 1 inch or larger severe; the bigger the stone, the more likely it is to crack a shingle.
How old are the homes in Denver, and does it matter for the roof?
The median home in Denver was built in 1974, and 57.4% of homes date from before 1980 (Census ACS). A roof on a home that old has often been re-covered at least once, so ask the roofer whether there is a second layer underneath: it changes the tear-off cost. The area sees about 147 freeze-thaw days a year, which loosens flashing and sealant.
What does roofing cost in Denver?
For an average 2,000 sq ft home we model asphalt-shingle re-roof at $7,560 to $16,740 in Denver, around $12,150 in the middle. That is about 2.1% of the median home value of $586,700. Your quote moves with roof size, pitch and how many layers come off.
How many roofing companies work around Denver?
The Census Bureau counts 103 roofing companies with payroll in Denver County, employing about 715 people. 75.7% of them have fewer than five employees, so most quotes come from owner-run crews. A roofer's median pay is $55,830 a year (BLS).
What flat roof problems are most common in Denver's climate?
Freeze-thaw cycling attacks flat roof seams and flashing laps: water that infiltrates a membrane joint freezes, expands, and pries the joint further open each cycle. Heat-welded TPO seams are much more resistant to this than taped EPDM laps or torch-applied modified bitumen that relied on adhesion alone. After an ice season in Denver, inspect all penetrations — HVAC curbs, plumbing vents, drains — where differential movement concentrates stress and where most freeze-thaw leaks start.
What is the difference between TPO, EPDM, and modified bitumen for Denver properties?
TPO (thermoplastic polyolefin) uses heat-welded seams and a white reflective surface — the current industry standard for new commercial and residential flat roofs, best for energy efficiency. EPDM (ethylene propylene diene monomer) is a rubber membrane installed with taped or adhesive seams — very durable and forgiving, widely used on residential flat roofs for decades. Modified bitumen is a reinforced asphalt sheet applied by torch or cold adhesive — economical and familiar to many local Denver contractors, though it runs warmer than TPO and may require more frequent coating. Cost, pitch, and building type typically dictate the right choice — a Denver flat-roof specialist can walk you through the tradeoffs for your specific structure.
Do I need a permit for flat roof in Colorado?
Permit requirements depend on the property, scope of work and local jurisdiction. Check with the city or county building department and confirm who will obtain any required permit before work starts.

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Figures above: NOAA Storm Events Database (hail, wind, tornado; county of the city, 2014–2026), U.S. Census Bureau American Community Survey 5-year estimates (housing), NASA POWER (temperature and rain, 2014–2023). Prices: our published price method. How we collect data.