Home age in ZIP 80031, Westminster, CO: median built 1985

Home age is not roof age, and the Census does not record replacements. ZIP 80031 in Westminster, CO: median home built 1985; 76% of homes (11,681) are older than 25 years and 10.4% (1,592) were built since 2010, out of 15,377 homes.

U.S. Census Bureau, American Community Survey 2019 to 2023 (5-year estimates), retrieved October 9, 2026. Area = Census ZIP Code Tabulation Area 80031.

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Share of homes in ZIP 80031 by decade builtColumns from the pre-1940 decade on the left to 2020 and later on the right. pre-1940 0.3 percent; 1940s 0.5 percent; 1950s 6.2 percent; 1960s 10.7 percent; 1970s 22.1 percent; 1980s 19.1 percent; 1990s 17.1 percent; 2000s 13.7 percent; 2010s 8.6 percent; 2020+ 1.7 percentpre-1940: 53 homes, 0.3%0.3%pre-1940Adams County: 1.8%1940s: 73 homes, 0.5%0.5%1940sAdams County: 1.6%1950s: 956 homes, 6.2%6.2%1950sAdams County: 10.1%1960s: 1,641 homes, 10.7%10.7%1960sAdams County: 9.9%1970s: 3,396 homes, 22.1%22.1%1970sAdams County: 13.9%1980s: 2,931 homes, 19.1%19.1%1980sAdams County: 12.2%1990s: 2,631 homes, 17.1%17.1%1990sAdams County: 14.8%2000s: 2,104 homes, 13.7%13.7%2000sAdams County: 20.8%2010s: 1,324 homes, 8.6%8.6%2010sAdams County: 12.7%2020+: 268 homes, 1.7%1.7%2020+Adams County: 2.2%Built 1999 or earlier: 76% of homes (11,681)ZIP 80031, built before 2000built 2000 or laterAdams County

Share of the 15,377 housing units in the ZIP, by decade built. The red marks are Adams County. This counts houses, not roofs: a roof is replaced several times in the life of a house, and no federal survey records when.

ZIP 80031 next to Westminster and Adams County

IndicatorZIP 80031WestminsterAdams CountyRank among 3 ZIPs of Westminster on this site
Housing units15,37750,166191,7651st of 3 largest
Median year built1985198719902nd of 3 oldest
Built before 198039.8%34.6%37.3%
Built before 200076%no data64.4%2nd of 3 highest share
Built since 201010.4%no data14.9%
Owner-occupied homes71.5%63.7%68.9%1st of 3 highest share
Single-family units76.8%66.1%no data
Median home value$499,200 (+/- $17,715)$497,400$458,4001st of 3 highest
Median household income$106,244 (+/- $6,533)$96,145no data1st of 3 highest

City figures are for the Census place, county figures for the county; “no data” means the Census file does not publish that figure. Value and income are survey estimates, the plus-or-minus is the 90% margin of error.

Every decade in ZIP 80031

BuiltShare of Adams CountyShare of ZIPHomes in ZIP 80031
2020+2.2%1.7%268
2010s12.7%8.6%1,324
2000s20.8%13.7%2,104
1990s14.8%17.1%2,631
1980s12.2%19.1%2,931
1970s13.9%22.1%3,396
1960s9.9%10.7%1,641
1950s10.1%6.2%956
1940s1.6%0.5%73
pre-19401.8%0.3%53

Counts are Census estimates of housing units by year built (table B25034). If a roof had never been replaced, it would be 3 to 6 years old on a house from the 2020s, 17 to 26 on one from the 2000s, 37 to 46 on one from the 1980s and 87 or more on one from before 1940. Most older houses have had at least one replacement, and the Census does not record when.

What the numbers say about ZIP 80031

ZIP 80031 has 15,377 housing units: 11,681 (76%) were built before 2000, 1,592 (10.4%) in 2010 or later, and 3,396 (22.1%) in the 1970s, its largest era. The median year built is 1985 (Westminster: 1987), so 2 years older than the city.

Housing mix and money, from the same survey: 71.5% of occupied homes are owner-occupied; 76.8% of units are single-family houses; the median owner-occupied home is valued at $499,200, give or take $17,715; median household income is $106,244, give or take $6,533; the ZIP holds 30.7% of the housing units the Census counts in Westminster, 15,377 of them. These are survey estimates with margins of error, and for a small ZIP the margin can be wide.

Reading this for roofs, carefully: the Census records when a house was built, never when its roof was last replaced. If every roof were still the one installed with its house, 9,050 units (58.9%, built before 1990) would be past the 30-year top of the usual asphalt-shingle range, 2,631 (17.1%, the 1990s) would mostly sit past it, 2,104 (13.7%, the 2000s) would mostly be inside the 20 to 30 year window and 1,592 (10.4%, 2010 onward) would be younger than it. Most older roofs have been replaced, so treat these as the pool of houses where an old roof is possible, not as a count of old roofs.

Roof age calculator for ZIP 80031

Enter the year your house was built, and the year the roof was last replaced if you know it. It starts at the median year built for this ZIP. The share of neighbours’ homes older than yours comes from this ZIP’s own decade counts.

–years old (roof)
–of homes in ZIP 80031 are older
–vs. the ZIP median year built

Material ranges are general planning figures (the same ones as on our roof-age page), not warranties. Sun, storms, attic ventilation and installation quality move them. The decade shares assume homes were built evenly within each decade. This is not an inspection: a roofer on the roof decides.

Map: ZIP 80031 among Westminster’s ZIP areas

Map of ZIP 80031 and nearby ZIP areas, shaded by the share of homes built before 2000ZIP 80004: 15,447 homes, 91.9% built before 2000, median year 197380004ZIP 80003: 14,193 homes, 91.3% built before 2000, median year 197680003ZIP 80234: 12,814 homes, 75.1% built before 2000, median year 199180234ZIP 80005: 11,397 homes, 82.7% built before 2000, median year 198080005ZIP 80212: 10,870 homes, 77.2% built before 2000, median year 195780212ZIP 80002: 9,960 homes, 65.2% built before 2000, median year 197980002ZIP 80216: 6,924 homes, 45.8% built before 2000, median year 200580216ZIP 80030: 6,823 homes, 93.7% built before 2000, median year 196580030ZIP 80031: 15,377 homes, 76% built before 2000, median year 198580031
  • under 20% built before 2000
  • 40 to 60%
  • 80% or more
  • Dot size = housing units. Red ring = ZIP 80031. Click a dot to open that ZIP.

Closest ZIP areas

ZIPMilesMedian builtPre-2000
800303.0 S196593.7%
802343.1 NE199175.1%
800033.6 S197691.3%
800055.1 W198082.7%
800046.1 SW197391.9%
800026.7 SW197965.2%

Distance is between Census ZIP centres.

Storm backdrop: Adams County

A ZIP is too small for its own hail record, so this is the county. FEMA’s National Risk Index rates Adams County Relatively Moderate overall (91.2 of 100), Very High for hail (99.7), Relatively High for strong wind (91.8) and Relatively High for tornado (93.5). NOAA logged 170 hail reports in the county, on 38 days with hail of 1 inch or more in the full years 2014 to 2025.

FEMA National Risk Index, December 2025 version, county level. This product uses FEMA’s National Risk Index data but is not endorsed by FEMA.

Where to go from here

Other roofing cities near ZIP 80031: Arvada, CO (6 miles), Denver, CO (10 miles), Boulder, CO (16 miles).

Questions

How old are the homes in ZIP 80031?

Of the 15,377 housing units, 6,119 (39.8%) were built before 1980, 11,681 (76%) before 2000 and 1,592 (10.4%) from 2010 on (Census ACS 2019 to 2023, survey estimate).

Does a house's age tell me how old its roof is in 80031?

No. ACS records the year the structure was built, not the year the roof was last replaced. With 6,119 units built before 1980 in this ZIP, many roofs are replacements rather than originals. Ask the seller for permit records or have a roofer inspect the roof.

Which nearby ZIP has the oldest housing?

Of the 6 closest ZIP areas we cover, 80030 (3.0 miles S) has the largest share built before 2000, 93.7%, against 76% in 80031.

Source: U.S. Census Bureau, American Community Survey 5-year estimates 2019 to 2023, tables B25034 (year structure built), B25035, B25003, B25024, B25077 and B19013, ZIP Code Tabulation Areas; ZIP-to-city assignment from the Census 2020 ZCTA-to-place relationship file (a ZIP is assigned to a city when more than half of its land area lies inside it). A ZCTA is not a USPS ZIP code: it approximates one and can differ at the edges. Public domain. The 12 ZIP-specific figures above differ from ZIP to ZIP.

Information only, not a roof inspection. Pickaroofer does not know the condition of any individual roof.