Addition vs. Renovation
An addition increases the square footage of a home; a renovation improves existing space without changing the footprint.
These two terms describe fundamentally different types of projects with different costs, permitting requirements, and impact on home value. A renovation (or remodel) improves or changes the use of existing space—updating a kitchen, finishing a basement, opening a floor plan. No new square footage is added; the work stays within the existing building envelope.
An addition creates new square footage by extending the footprint (a room addition, bump-out, or garage conversion with new exterior walls) or building upward (second-story addition). Additions require full structural design, foundation work, exterior framing, roofing, and tie-in to all mechanical systems. They are substantially more complex and expensive per square foot than renovations.
Cost benchmarks: additions typically run $150–$350+ per square foot of new space; renovations of existing space run $80–$200+ per square foot depending on trade intensity. Both require permits. Return on investment varies—kitchens and baths typically return 60–80% of cost; additions that add bedrooms or create functional flex space can return more in high-demand markets.
Real-World Example
Rather than an addition costing $75,000, the family chose a renovation that converted the underused formal dining room into a home office for $22,000.