Midtown Home Improvements
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Get a Free QuoteTypical cost range · Union
Home Addition across the Union typically costs $40,000 to $150,000, with strong homeowner demand across the St. Louis Metro.
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Mid-range cost and resale value from the 2025 Remodeling Cost vs. Value report. Union is benchmarked using the West North Central regional average.
| Project | Cost | Resale Value | ROI |
|---|---|---|---|
| Deck Addition | Wood | $18,263 | $17,323 | 95% |
| Deck Addition | Composite | $25,096 | $22,199 | 89% |
| Bathroom Addition | Midrange | $60,645 | $32,347 | 53% |
| Bathroom Addition | Upscale | $111,255 | $40,526 | 36% |
| Primary Suite Addition | Midrange | $170,517 | $55,097 | 32% |
| Primary Suite Addition | Upscale | $351,613 | $63,136 | 18% |
Source: Remodeling Magazine 2025 Cost vs. Value. Mid-range tier.
Union Market
Bump-outs cost $5,000–$30,000 and expand a room 2–15 feet without new foundation work. Full additions cost $30,000–$100,000+ and require foundation, framing, and roof extension. Here's how to know which your project actually needs.
Midwest home additions cost $150–$300 per square foot and return 50–65% at resale. Here's which additions pencil out, which don't, and how to decide for your home.
Before you commit to a kitchen overhaul or deck addition, see exactly what each project returns at resale. Our ROI calculator uses 2025 Cost vs. Value data to show you the numbers in seconds.
Home additions cost $150–$310 per square foot for finished living space, with second-story additions running 25–40% more. Use our estimator to get a realistic budget range before you meet with a general contractor.
All home additions require permits for structural, electrical, plumbing, and HVAC work. Permit costs run 0.5–2% of project cost. Here's what gets inspected, how long approval takes, and what happens if you skip it.
Most homeowners sign contractor contracts they don't fully understand. Here are the 8 clauses that create risk — and the 5 things every legitimate contract must include.
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Nearby areas: St. Louis