Home Addition in Weldon Spring sees strong homeowner demand across the St. Louis Metro.
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Typical Range
$40,000 to $150,000
Typical Home Addition projects in Weldon Spring run $40,000 to $150,000.
Mid-range cost and resale value from the 2025 Remodeling Cost vs. Value report. Weldon Spring 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.
Regional ROI by year
| Year | ROI |
|---|---|
| 2020 | 66.8% |
| 2021 | 63.2% |
| 2022 | 62.1% |
| 2023 | 39.8% |
| 2024 | 68.2% |
| 2025 | 88.5% |
Source: Remodeling Cost vs Value data, 2020 to 2025.
Weldon Spring Market
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Nearby areas: St. Louis
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Converting an attached garage to living space costs $15,000–$50,000 depending on scope. ROI is 65–80% — better than most additions. But there are real tradeoffs in cold climates and HOA neighborhoods.
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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.
