How much does it cost to finish a basement?
Finishing a basement costs $30 to $50 per square foot, or $15,000 to $75,000 for 500 to 1,500 square feet, per HomeGuide.
Finishing and remodelling are different jobs at different prices, and the words get used interchangeably. HomeGuide defines finishing as changing a basement from bare concrete into a livable space with floors, walls and windows, at $30 to $50 per square foot. It defines remodelling as changing the look or function of a space that is already finished, at $25 to $65 per square foot or $12,500 to $37,500 total. Partially finishing a basement runs $2,500 to $20,000 on its figures.
This page is general information, not professional advice. Remodeling prices move with your local labor market, the condition of what is already there, the finishes you pick and what your building department requires, and the only number that counts is a written quote from a contractor who has walked the job.
Basement finishing cost by size
| Basement size | Open plan | Three rooms |
|---|---|---|
| 300 sq ft | $9,000 – $12,000 | $12,000 – $15,000 |
| 500 sq ft | $15,000 – $20,000 | $20,000 – $25,000 |
| 800 sq ft | $24,000 – $32,000 | $32,000 – $40,000 |
| 1,000 sq ft | $30,000 – $40,000 | $40,000 – $50,000 |
| 1,500 sq ft | $45,000 – $60,000 | $60,000 – $75,000 |
| 2,000 sq ft | $60,000 – $80,000 | $80,000 – $100,000 |
Source: HomeGuide
The gap between the two columns is the walls. HomeGuide's own note on the table is that choosing an open floor plan could save thousands in lumber, drywall and insulation, and its second note is the one people trip over: a basement room needs a window, a closet and a door before it counts as a bedroom. A 1,000-square-foot basement is $30,000 to $40,000 open and $40,000 to $50,000 divided.
Source: HomeGuide
What each room costs to finish
| Room | Average cost to finish |
|---|---|
| Hallway | $1,000 – $2,500 |
| Bathroom | $2,500 – $12,500 |
| Bedroom (each) | $3,000 – $12,000 |
| Kitchenette | $5,000 – $20,000 |
| Living area | $6,000 – $16,000 |
Source: HomeGuide
A separate basement bathroom addition runs $10,000 to $25,000 on HomeGuide's figures, and the difference between that and the $2,500 to $12,500 finishing line is whether the plumbing is already roughed in. Its plumbing rates are $450 to $1,800 per fixture, or $4 to $6 per square foot to rough in piping, with plumbers at $45 to $150 per hour.
Source: HomeGuide
A finished basement has to be heated for its square footage to count toward the home's living space at all. That is HomeGuide's line, and it is the difference between adding value and adding a rec room.
The lines that are not optional
Four of them, on HomeGuide's tables. Waterproofing at $1,900 to $6,300 as a finishing line, or $6,000 to $18,000 for the full job of sealing the walls and adding a pump and a drain. An egress window at $2,000 to $5,000 installed, which every basement bedroom or living area is required to have. Heating and cooling at $5,000 to $11,000, because of the heated-space rule above. And a permit at $200 to $1,000, or 1% to 2% of the total. HomeGuide also lists radon testing at $125 to $400 and a mold inspection at $300 to $650 as common on basement projects.
Ceiling height is the check to make before any of that. HomeGuide says a basement must be 7 to 8 feet tall to count as living space, that its ceilings must be at least 7 feet, and that digging and lowering a basement floor costs $50 to $100 per square foot while lifting a house costs $10,000 to $40,000. On a 1,000-square-foot basement, lowering the floor would cost more than finishing it.
The contractor's own share of that number, which the cost guides do not break out: what it costs to hire a contractor to finish a basement.
Compare estimates from companies with several years of basement work behind them, and read the waterproofing line on each one. These are the general contractors AI assistants actually name when homeowners ask. Nobody can pay to be on these lists.
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Questions people ask next
- How much does it cost to finish a 1,000 sq ft basement?
- HomeGuide publishes $30,000 to $40,000 for a 1,000-square-foot open-plan finish and $40,000 to $50,000 for the same space divided into three rooms, at its $30 to $50 per square foot.
- Does finishing a basement add value?
- HomeGuide puts the return on investment for a basement remodel at 65% to 70%, and says the amount depends on the scope and the square footage. It also says the space has to be properly finished, heated and fitted with the required egress before it counts toward the home's living area.
- What is the cheapest way to finish a basement?
- On HomeGuide's own figures, an open floor plan — it publishes $30,000 to $40,000 for 1,000 square feet open against $40,000 to $50,000 for three rooms, and says the saving is in lumber, drywall and insulation. Partially finishing runs $2,500 to $20,000 on HomeGuide's figures.
- How long does finishing a basement take?
- HomeGuide puts a basement remodel at 3 to 8 weeks on average, and says demolition, structural changes or materials on backorder push it longer.
Written for homeowners by Most Recommended Contractors, which measures which general contractors AI assistants actually recommend in 26 U.S. metros. Nobody can pay to be on those lists. How we measure.