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Home Addition Cost Calculator — Oak Park IL

Home addition costs in Oak Park IL, Illinois run close to the national average. Square footage, foundation type, and whether you're adding a bathroom or kitchen are the biggest cost drivers in the Midwest region.

Low estimate$26,200
Average$68,200
High estimate$157,600

Addition square footage

Addition square footage 300

Quality Tier

Standard materials, solid craftsmanship

Scope of Work

Labor

Labor portion of total cost 40%

Home Addition Cost in Oak Park IL: 2026 Guide

Use the calculator above to get a quick estimate. The guide below explains what drives home addition costs in Oak Park IL and what to expect from contractors in Oak Park IL.

Typical Home Addition Costs in Oak Park IL

Project ScopeLowHigh
Simple room bump-out (100–200 sqft)$9,200$17,000
Standard bedroom addition (200–350 sqft)$26,200$57,600
Master suite with bathroom (350–500 sqft)$57,600$68,200
Full in-law suite or major addition (600–1,000 sqft)$68,200$157,600

What Affects Home Addition Costs in Oak Park IL?

Labor rates: Contractors in Oak Park IL charge $47–$94/hour for home addition work — close to the national average.

Material costs: Material prices in the Midwest region are close to national average due to local supply, transportation costs, and market demand.

Project complexity: Site conditions, permitting requirements, and non-standard layouts can add 15–30% to total project cost.

Frequently Asked Questions

How much does a home addition cost in Oak Park IL?
Home additions in Oak Park IL cost $26,200–$157,600 depending on size and scope. A simple bedroom addition (200–300 sqft) runs $26,200–$57,600. A master suite or in-law addition with a bathroom runs $68,200–$157,600.
What is the cost per square foot for a home addition in Oak Park IL?
Home additions in Oak Park IL cost $150–$400 per square foot fully finished. The Midwest region averages close to national rates due to local labor market. Basic additions run $47/sqft; luxury finishes hit $94/sqft+.
How long does a home addition take in Oak Park IL?
A standard bedroom addition (200–400 sqft) takes 2–4 months from permit to completion in Oak Park IL. Additions requiring new plumbing or HVAC take 3–6 months. Permitting adds 4–8 weeks upfront.
Is a home addition worth it vs. moving in Oak Park IL?
In Oak Park IL, home additions often cost less than selling and buying a larger home (especially with closing costs and moving expenses). A $68,200 addition can add $57,600–$68,200 in home value while keeping your current location.

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Estimated cost in Oak Park IL

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Labor$0
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