Westmont: permits, utilities and drainage

Generated illustration of an imagined residential setting for the Westmont resource — AI-generated illustration; does not depict an actual property or location.

Begin with the address in Westmont

Westmont (Census place 1780645) lies in DuPage County on the January 1, 2024 boundaries; confirm that the parcel is inside the municipal limits before applying local rules.

Drainage and flooding questions appear in the local research; check the parcel's own floodplain and stormwater records. The local questions below return most often to permits, utilities and drainage.

Local requirements, with their limits visible

The 12 local questions below draw on official Westmont and agency material checked on October 6, 2026; the sources do not establish parcel-specific compliance. Confirm the current requirements for legal use with the responsible authority.

When preparing an offer or sale, confirm the current procedure, responsible party, required documents and timing for the exact property. Older documents, unreadable sources and conflicts require confirmation with the responsible office before relying on them.

The May 2026 ordinance may not yet appear in the online code; confirm ADU eligibility and later amendments with Village staff.

Reported home value: $379,100
Monthly owner costs, with mortgage: $2,342

ACS 2020–2024, municipality-wide medians in 2024 inflation-adjusted USD. Open-ended medians display a lower bound. These figures are not a current home valuation or a financing quote.

Housing types: The ACS estimates 11,526 housing units in Westmont. Largest structure categories: 1 unit, detached: 4,704 (± 270), about 41%; 10–19 units: 1,622 (± 271), about 14%; 5–9 units: 1,279 (± 225), about 11%. Source 1
Construction periods: Of 11,526 estimated units, the largest construction periods are 1970 to 1979: 3,196 (± 408), about 28%; 1980 to 1989: 1,781 (± 272), about 15%; 1960 to 1969: 1,671 (± 315), about 14%; about 5% were built in 1939 or earlier. Source 1
Reported home value: The median value reported for owner-occupied units in Westmont is $379,100 (± $22,771), in 2024 inflation-adjusted dollars. Source 1 · Source 2
Monthly owner costs: Median selected monthly owner costs are $2,342 (± $169) with a mortgage and $960 (± $40) without one. Source 1 · Source 2 · Source 3
County context: The 2024 Census polygons place Westmont in DuPage County; verify the parcel's county and taxing bodies in official records. Source 1 · Source 2

How to read these numbers → Compare Westmont with other municipalities →

THE HOMES BEHIND THE NUMBERS

Explore Westmont’s housing stock.

Look at the estimated mix of buildings and construction periods, then use it to shape your property research.

ACS 2020–2024 · Estimated housing units · Tap or focus a row to inspect it.

Select a row for its estimate and uncertainty. A municipality-wide distribution does not describe every individual property.

Read both housing distributions as tables

Westmont · Building types · ACS 2020–2024
Category	Estimated units	Margin of error, units	Share, point estimate
1 unit, detached	4,704	270	40.8%
1 unit, attached	963	202	8.4%
2 units	160	89	1.4%
3–4 units	743	181	6.4%
5–9 units	1,279	225	11.1%
10–19 units	1,622	271	14.1%
20–49 units	837	179	7.3%
50+ units	1,213	211	10.5%
Mobile home	5	9	0.0%
Boat, RV, van, etc.	0	24	0.0%

Westmont · Construction periods · ACS 2020–2024
Category	Estimated units	Margin of error, units	Share, point estimate
2020 or later	154	135	1.3%
2010 to 2019	244	108	2.1%
2000 to 2009	1,314	323	11.4%
1990 to 1999	1,117	209	9.7%
1980 to 1989	1,781	272	15.5%
1970 to 1979	3,196	408	27.7%
1960 to 1969	1,671	315	14.5%
1950 to 1959	1,264	279	11.0%
1940 to 1949	200	112	1.7%
1939 or earlier	585	209	5.1%

Shares use the category estimate divided by its table total. Displayed margins of error apply to the unit counts; percentage uncertainty has not been derived. Read the original Census data · Data definitions.

YOUR QUESTIONS, ROOTED IN THE PLACE

Buying and selling in Westmont.

12 local research questions

Choose the questions that fit your move. These controls narrow the reading links; every answer remains on this page.

Local research topic

12 reading links shown. Direct links always reach the full answer below.

Local research · Buyers & sellers

Where should I verify Westmont's current zoning after the recent amendments?

Westmont’s amended-zoning page says its May 28, 2026 amendments are effective while codification is pending, and directs readers to the dated ordinance PDF. A buyer investigating an accessory dwelling unit or another use should ask Planning and Zoning to confirm the current provisions and parcel conditions rather than rely only on the online code. The page identifies ADUs for qualifying detached-house residential lots, with other housing types treated differently. Confirm the actual proposed unit, building requirements and current ordinance before making rental income or construction assumptions.

Confirm current applicability · Checked 2026-10-06 · Source 1

Local research · Buyers & sellers

Which Westmont office should I contact about permits and older improvement records?

Westmont separates its Permitting Division, which reviews plans and performs construction inspections, from Planning and Zoning, which handles permitted uses and site review. Ask Permitting about the improvement’s issued scope, inspection status and available records, and direct use or development-standard questions to Planning. Its Community Development page also links the DuPage parcel viewer for address research. Use those resources together when evaluating a purchase; a county parcel view does not establish municipal construction approval, and an approved building plan does not resolve every proposed use.