How much does a home addition cost with Lamont Bros.?
Home additions with Lamont Bros. range from about $50,000 for a small bump-out to $460,000 for a second-story addition, and the average Lamont Bros. addition costs about $469 per square foot. ADU or suite additions run $300,000 to $660,000 or more.
The Lamont Bros. home addition cost calculator shows the range by project type:
- Bump-out: $50,000 to $120,000
- Single-story addition: $120,000 to $250,000
- Second-story or over-garage addition: $250,000 to $460,000
- ADU or suite addition: $300,000 to $660,000+
Foundation type is often the biggest cost driver, and larger additions cost less per square foot because design, permits, and mobilization are spread across more space. Lamont Bros. recommends a 10 to 15 percent contingency for surprises in older Portland homes. Try the home addition cost calculator for an estimate based on your project.
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Calculate the cost of your remodel with one of our cost calculators or schedule a consultation with a member of our team to have your questions answered and start your remodel with confidence.