Home project cost
How Much Does It Cost to Finish a Basement?
Finish an 800 sq ft basement into a living area and half bath
DIY range
$4,000-$15,000
Professional range
$18,000-$55,000
What drives the cost
- Moisture control and waterproofing before finishing
- Ceiling height and whether ductwork/plumbing needs rerouting
- Adding a bathroom, which involves plumbing and often a sewage ejector pump
- Egress window requirements if adding a bedroom
Skipping moisture mitigation to save money upfront is the most expensive mistake in basement finishing — mold and rot behind new drywall can cost more to fix than the entire original project.
Where the money goes
- Framing and insulation of exterior walls
- Electrical circuits and lighting, often needing a panel upgrade
- Flooring suited to below-grade moisture, like LVT rather than solid wood
- Bathroom plumbing and a sewage ejector pump if below the main sewer line
Put this into practice
- Project Cost EstimatorWhat will this project cost me?
- Insulation R-Value CalculatorWhat R-value do I need, and how much?
- Drywall CalculatorHow many sheets of drywall do I need?
More cost guides
- How Much Does It Cost to Paint a Room?DIY and professional cost ranges for painting an average bedroom or living room, and what actually moves the price.
- How Much Does New Flooring Cost?Cost ranges per square foot for laminate, LVT, engineered wood, and tile flooring, installed and DIY.
- How Much Does It Cost to Tile a Bathroom?Cost ranges for tiling a bathroom floor and shower surround, DIY and professional, and where the money goes.