Looking for an addition contractor in Marion, IA? Describe your project once and up to three addition contractors who work in Marion and Linn County get back to you with a quote. It's free and there is no obligation.
Marion is home to about 42,542 people (2024 Census Bureau estimate), a growing community (+2.4% since 2020). With 2,363 people per sq mi, it is a suburban area. Growing families here often add space instead of moving.
Marion at a glance
- Population (Census Bureau estimate, 2024)
- 42,542 (+2.4% since 2020)
- Rank in Iowa
- 13th of 940 cities and towns
- Land area
- 18 sq mi
- Population density
- 2,363 people per sq mi (suburban)
- Type
- City (Marion city)
- Main county
- Linn County
What to check before hiring in Marion
- Zoning: check Marion's setbacks, lot coverage and height limits first.
- License and permit: in Iowa, additions are built by licensed contractors under a permit.
- Structure: second stories need an engineer to check the existing house.
- Price drivers: size, foundation, roof tie-in, plumbing and finishes.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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NAHB
Official information and guidance.
Services available in Marion
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Room addition
Ground-floor addition with foundation, framing, roof and finishes.
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Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in Marion
How much does an addition cost in Marion, IA?
It depends on size, foundation and finishes. Describe your project: contractors who serve Marion reply with a quote.
How long does it take?
Often a few months, plus design and permits.
Does an addition raise property taxes?
Usually, since it increases the assessed value.
Which addition contractors will contact me?
Up to three independent addition contractors who serve Marion and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.