Home Addition ROI Calculator
Does adding square footage make financial sense? Estimate cost, value added, and cost recovery.
Estimate Addition ROI →Estimate Your Addition ROI
Results update as you change any input.
Estimates are for educational purposes only · Not a guarantee of value increase
The Formula This Calculator Uses
$180,000 home addition, $122,000 estimated value added:
Cost recovery = $122,000 ÷ $180,000 = 68%
Net difference = $122,000 − $180,000 = −$58,000.
Frequently Asked Questions
Does added square footage always increase home value dollar-for-dollar?
No. This comparison is a scenario estimate — added square footage does not necessarily translate dollar-for-dollar into market value. The relationship depends heavily on your neighborhood, comparable sales and buyer expectations.
How is cost per added square foot different from a home's overall price per square foot?
Cost per added square foot reflects only the marginal cost of the new construction — foundation, framing, finishes for the addition itself. It is often higher than a home's blended overall price per square foot, which includes land value and existing structure.
Could my addition make my home too big for the neighborhood?
Possibly. Homes that become unusually large relative to nearby comparable sales sometimes see reduced value recovery, since buyers and appraisers often reference nearby homes of similar size. Consider typical home sizes nearby before finalizing scope.
Is it cheaper to add space or move to a bigger home?
It depends on your local market, the cost of the addition, and the price of a comparable larger home. Use the Remodel vs. Move comparison after running your addition numbers to see a side-by-side estimate.
What is not included in this calculator?
This calculator does not estimate neighborhood-specific value impact without your own comparable-sales input, and does not guarantee any specific increase in appraised or sale value. It is a scenario estimate based on the numbers you enter.
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Educational Use Only: Reaixo provides estimates and scenario calculations for informational and educational purposes. Reaixo is not an appraiser, contractor, real-estate broker, lender, financial advisor, or investment advisor. Remodeling costs, construction costs, property-value changes and cost recovery vary significantly by property, location, project scope, workmanship, permits and market conditions. Calculator results are not an appraisal or guarantee of increased property value.