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A basement remodel typically costs 30–50% less than a home addition, averaging $25,000 to $70,000 depending on design scope, finishes, and layout. Because the structure already exists, basement renovations offer one of the best returns on investment among major remodeling projects.

Converting a basement into a rental suite or ADU typically costs $40,000 to $120,000, depending on layout, plumbing, and finishes. The average price per square foot ranges from $20 to $45, and rental income can offset costs within five to seven years.

The average cost to finish a basement ranges from $7 to $23 per square foot, depending on materials, design complexity, and contractor rates. In Denver, homeowners typically spend $40,000–$70,000 for a finished basement with livable amenities like bathrooms, offices, or media rooms.

To finish a basement adds valuable living space and boosts property value, but the cost can vary widely on design and materials. According to sources and trends, the average cost to finish a basement ranges between $7 and $23 per square foot. For a 2,500-square-foot basement, homeowners can expect to invest between $17,500 and $57,500 on average.

In early November 2025, Littleton voters approved Ballot Question 3A by a margin of approximately 55 percent, enshrining single-family zoning protections into the city’s charter. (The Colorado Sun) The new amendment freezes zoning rules in most residential districts as of January 1, 2025, and requires voter approval for city-initiated rezoning of those districts. (littletonco.gov)