That's our range to finish a dry basement, with a typical cost of about $37.50 per sq ft. For 800 sq ft that's roughly $20,000 – $35,000. An open plan sits lower; bedrooms, a bathroom, egress windows or waterproofing push it higher.
Estimate Our range, based on sources [1][2][3]. Planning numbers, not quotes. Moisture, egress and plumbing can change the number a lot.
Basement finishing cost by size and layout
The two biggest inputs are how big the space is and how many rooms you build. Walls, doors and extra circuits for separate rooms add up, so an open plan costs less per square foot. We shift our blended rate down $5/sq ft for an open plan and up $5 for a three-room layout, based on the gap HomeGuide reports between the two.[1]
| Basement size | Open plan Estimate $20–$39/sq ft | Three rooms Estimate $30–$49/sq ft |
|---|---|---|
| 500 sq ft | $10,000 – $19,500 | $15,000 – $24,500 |
| 800 sq ft | $16,000 – $31,000 | $24,000 – $39,000 |
| 1,000 sq ft | $20,000 – $39,000 | $30,000 – $49,000 |
| 1,200 sq ft | $24,000 – $47,000 | $36,000 – $59,000 |
| 1,500 sq ft | $30,000 – $58,500 | $45,000 – $73,500 |
Estimate Our range, based on sources [1][2][3]. For each tier we pooled the low, midpoint and high figure each source publishes for a comparable scope (a single benchmark figure counts once), then used the median as Typical and the middle half of the pooled figures as Low–High. Inputs were HomeGuide's open-plan and three-room rates, Angi's per-sq-ft range for lighter finishing, and the Cost vs. Value benchmark converted to $/sq ft after removing its bathroom at the midpoint of HomeGuide's basement-bath range. Bathrooms, egress and waterproofing are extra. See How we build our ranges.
What the sources say Sourced
HomeGuide puts basement finishing at $30 to $50 per sq ft.[1] Angi's 2026 average project is about $32,000, and it uses a much lower $7 to $23 per sq ft for partly finished, smaller-scope basements.[2] The 2025 Cost vs. Value report priced a 20×30 ft entertaining space with a wet bar and a full bathroom at $52,012 nationally.[3] “Finishing” covers everything from paint and carpet to a full suite, so make sure every bid prices the same scope.
Line-item breakdown: 800 sq ft, open plan Estimate
Here's how we'd build the budget for finishing an 800 sq ft dry basement as one open room with no bathroom: framing the outside walls, insulation, drywall, electrical, ductwork, flooring, doors, trim and paint.
| Line item | How we priced it | Amount Estimate |
|---|---|---|
| Perimeter wall framing, about 120 linear ft Installed price | Midpoint of HomeGuide's per-foot framing range[1] × 120 ft | $2,520 |
| Wall insulation, about 960 sq ft Installed price | Midpoint of HomeGuide's per-sq-ft insulation range[1] | $1,920 |
| Drywall, walls and ceiling, about 1,760 sq ft Installed price | Midpoint of HomeGuide's per-sq-ft drywall range[1] | $4,400 |
| Electrical: outlets, switches, lighting circuits, recessed lights Labor | 36 hrs × $30.38/hr median wage for electricians[4] × 1.7 labor burden | $1,860 |
| Electrical materials and fixtures Materials | Our allowance | $1,100 |
| Extend heating and cooling ductwork Installed price | Midpoint of HomeGuide's duct-extension range[1] | $2,450 |
| LVP flooring, 800 sq ft Installed price | Our typical installed LVP rate ($9/sq ft) from the flooring guide | $7,200 |
| Two interior doors, installed Installed price | Midpoint of HomeGuide's installed door range[1] | $1,050 |
| Trim and finish carpentry Labor | 24 hrs × $29.12/hr median wage for carpenters[4] × 1.7 labor burden | $1,190 |
| Trim and hardware Materials | Our allowance | $600 |
| Painting walls and ceiling Labor | 30 hrs × $23.75/hr median wage for painters[4] × 1.7 labor burden | $1,210 |
| Paint and supplies Materials | Our allowance | $450 |
| Cleanup and haul-away Labor | 10 hrs × $22.66/hr median wage for construction laborers[4] × 1.7 labor burden | $390 |
| Dumpster Materials | Our allowance | $450 |
| Permit Fee | Average of the HomeGuide and Angi permit midpoints[1][2] | $1,100 |
| Overhead & profit Our assumption | 20% on the labor and materials lines above. Installed prices and fees already include the installer's margin, so we don't mark them up again. | $1,450 |
| Line-item total | Before contingency and regional adjustment | $29,300 |
Estimate Our line-item build comes to $29,300, about 13% above our blended typical of $26,000 for 800 sq ft, open plan. The build assumes a dry basement with ceilings already tall enough. Method: How we build our ranges.
Add-ons that change the total most Sourced
These are quoted from HomeGuide[1] and used as-is in our calculator: a new basement bathroom with fresh drain and supply lines, $10,000 – $25,000; an egress window, $2,000 – $5,000 each, installed; a full waterproofing system, $6,000 – $18,000.
Basement Finishing Cost Planner
A square-foot based planner for framing, drywall, electrical and egress, with an optional bathroom add-on and a moisture-control checklist.
See what's plannedWhat drives the cost up or down
Water comes first
Finishing over a damp basement wastes money. Fix grading, gutters and any seepage before you frame, and budget for a waterproofing system if the walls or floor show water.
Egress and bedrooms
Sleeping rooms below grade generally need an emergency escape window or door, and a room usually needs a window, a closet and a door to be listed as a bedroom. Check your local code before you plan bedrooms.
Adding a bathroom
Below-grade plumbing is often the single biggest add-on, because floors may need to be cut for drains or a sewage ejector added. Placing the bath near the existing stack keeps costs down.
Layout
Every wall adds framing, drywall, a door and outlets. That's why our three-room rate runs $10/sq ft above our open-plan rate.
Heating, cooling and ceilings
Finished space needs heat, and low beams, ducts and pipes can force soffits or a drop ceiling. Our line items include a duct extension but no new equipment.
Contingency Estimate
Cracks, old wiring or poor drainage show up once work starts. We suggest holding back 10% to 20%. That's our planning guidance.
Regional cost differences
Instead of republishing regional tables, we apply our own cost index for each Census division to the typical 800 sq ft open-plan job.
| Region (Census division) | Our cost index Estimate | Typical 800 sq ft, open plan Estimate |
|---|---|---|
| New England CT, ME, MA, NH, RI, VT | 1.04 4% above U.S. | $27,000 |
| Middle Atlantic NJ, NY, PA | 1.13 13% above U.S. | $29,500 |
| South Atlantic DE, DC, FL, GA, MD, NC, SC, VA, WV | 0.98 2% below U.S. | $25,500 |
| U.S. average | 1.00 | $26,000 |
| East North Central IL, IN, MI, OH, WI | 0.96 4% below U.S. | $25,000 |
| East South Central AL, KY, MS, TN | 0.90 10% below U.S. | $23,500 |
| West North Central IA, KS, MN, MO, NE, ND, SD | 1.02 2% above U.S. | $26,500 |
| West South Central AR, LA, OK, TX | 0.89 11% below U.S. | $23,000 |
| Mountain AZ, CO, ID, MT, NV, NM, UT, WY | 0.96 4% below U.S. | $25,000 |
| Pacific AK, CA, HI, OR, WA | 1.07 7% above U.S. | $28,000 |
Estimate Derived, not published. Our interior index divides each division's 2025 Cost vs. Value average for four interior projects (three bathroom remodels and a basement remodel) by the national average and averages the four ratios.[3] The typical column multiplies our national typical by the index. See How we build our ranges.
Basement finishing cost FAQ
How much does it cost to finish a 1,000 sq ft basement?
By our ranges, about $20,000 – $39,000 as an open plan and $30,000 – $49,000 with three rooms, before a bathroom, egress windows or waterproofing.[1][2][3]
Does finishing a basement add value?
Usually some. The 2025 Cost vs. Value basement remodel recouped about 71% of its cost at resale nationally.[3]
How long does it take to finish a basement?
HomeGuide estimates 4 to 16 weeks, depending on size, the number of rooms and the scope.[1] Waterproofing or structural repairs come first and can add time.
Do I need a permit to finish a basement?
In most places, yes, especially for new walls, wiring, plumbing or bedrooms. Our line items budget about $1,100 for permits, but your building department sets the actual fee.
What's the cheapest way to finish a basement?
Keep it open, skip the bathroom or put it near existing plumbing, and choose budget flooring. See our flooring cost guide for per-sq-ft ranges by material.
Related cost guides
Sources
- HomeGuide, “How much does it cost to finish a basement?” (updated Feb 6, 2026). homeguide.com/costs/cost-to-finish-a-basement (accessed Oct 8, 2026).
- Angi, “How Much Does It Cost to Finish a Basement? [2026 Data]” (updated July 9, 2026). angi.com/articles/how-much-does-it-cost-finish-basement.htm (accessed Oct 8, 2026).
- Zonda / Journal of Light Construction, 2025 Cost vs. Value Report: national averages, the Basement Remodel project description and regional pages (New England, Middle Atlantic, South Atlantic, East North Central, East South Central, West North Central, West South Central, Mountain, Pacific) (accessed Oct 8, 2026). © 2025 Zonda Media. We quote a few national figures and use the regional figures only to derive our own cost index. States per division from the U.S. Census Bureau, Census Regions and Divisions.
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics (OEWS), May 2025 national median hourly wages by occupation, retrieved through the BLS Public Data API. bls.gov/oes (accessed Oct 8, 2026).
Quoted figures are labeled Sourced. Everything labeled Estimate is our own arithmetic on these sources, explained in How we build our ranges. Planning numbers only, not quotes. Get itemized local bids before you commit.