Home addition builders in Affton, MO

A typical home addition project runs $40,000 to $150,000. Tell us about yours and compare bids from local pros.

A home addition with large sliding glass doors opening to a patio and fire bowl

Free to request

$40K to $150K

typical home addition project

Typical range

How Much Does Home Addition Cost in Affton, MO?

Typical Range

$40,000 to $150,000

The typical Home Addition project range is $40,000 to $150,000, a general range for the service.

Home Addition cost figures for Affton

Home Addition cost figures for Affton, MO, with the source of each figure
Figure	Amount and source
Typical project range	$40,000 to $150,000Typical project range from our service pricing data.

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What affects home addition in Affton?

Licensing
Missouri does not license this trade statewide; check with Affton or the county before hiring.
Source: Missouri Division of Professional Registration, checked September 2026 (opens in a new tab)

Home Addition companies listed for Affton

1 home addition company is listed for Affton. They come from public business records and our own checks. Each one shows what we checked and the date where we have one. Listing is not a recommendation.

Midtown Home Improvements
Midtown Home Improvements has a 4.2 Google rating from 1,891 reviews.
Last checked October 2026
- License checked in state records
- Insurance document checked
- Warranty offered
- BBB accredited
- 36 Years in Business
- Wentzville, MO
Is this your business? Update or remove the listing for Midtown Home Improvements Get bids

About Affton, MO

Population: 19,052; Source: U.S. Census Bureau, American Community Survey, 2024
Median household income bracket: $75,000-$99,999; Source: U.S. Census Bureau, American Community Survey, 2024
Median annual property tax bracket: $2,000 to $2,999; Source: U.S. Census Bureau, American Community Survey, 2024
Climate zone: IECC climate zone 4A; Source: 2021 International Energy Conservation Code climate zone map
Storm history: From 2016 through 2025, St Louis County recorded 150 hail events of 1 inch or larger, 42 severe hail events of 1.75 inches or larger, 125 damaging-wind events of 58 mph or stronger, and 17 tornado events, per NOAA Storm Events data.; Source: NOAA Storm Events Database

ZIP codes in Affton

63123

From our guides

The Certificate of Insurance is a summary document, not a guarantee of coverage. It is a one-page snapshot of what policies existed at the time an insurance agent issued the form.
From How to Read a Contractor's Certificate of Insurance (COI)
A bump-out and a full addition serve different purposes. Choosing the wrong one either overspends on a problem that didn't need a full addition, or undershoots and creates a space that still doesn't work. Here's how to match the right approach to your actual project.
From Bump-Out Addition vs. Full Addition: Which Makes Sense for Your Project?
Midwest homeowners considering an addition in 2025 are weighing a real tension: building costs have increased 30–40% since 2020, but so have home values.
From Home Addition ROI in the Midwest: Is It Worth It in 2026?

Home Addition in Affton: common questions

How much does home addition cost in Affton, MO?

A typical home addition project runs $40,000 to $150,000. That is a general range for the service, not a quote for Affton, MO. Your price depends on size, materials and access, so compare bids for your specific project.

How many home addition companies are listed for Affton, MO?

We list 1 home addition company that serve Affton, MO. They come from public business records and our own checks, and each listing shows what we checked, with the date where we have one. A listing is not a recommendation.

How do I get bids for home addition in Affton, MO?

Describe your project in the bid form on this page. Companies that take this kind of work may contact you with bids. There is no obligation to hire anyone.