What total budget are you planning for the basement?
Angi's 2026 guide reports a typical range of $15,000 to $75,000 with a $32,000 average.
No votes yet. Yours will be the first. · saved on this device
Basement Scope · Cost calculator
Basement finishing cost calculator
This calculator estimates the cost to finish a basement from your finished square footage, a finish tier, a layout complexity level and add-ons such as a bathroom, egress window, interior drainage, radon mitigation, wet bar and backup sump. It is anchored to Angi's 2026 national benchmark and to Fixr, HomeAdvisor and Bob Vila cost guides, and it produces a first budget to bring to written estimates.
Skip to the calculatorBase rates are anchored to: Angi, How Much Does It Cost to Finish a Basement (2026); HomeGuide, Cost to Finish a Basement (2025); HomeAdvisor, How Much Does It Cost to Finish a Basement (2026); Fixr, Basement Remodeling Cost (2025); Fixr, Egress Window Installation Cost (2025); Bob Vila, Basement Waterproofing Cost (Angi data) (2024); HomeAdvisor, How Much Does a Radon Mitigation System Cost (2026); HomeAdvisor, How Much Do Building Permits Cost (2026).
By the numbers
Cost benchmarks behind the calculator
$15,000–$75,000
Typical cost range to finish a basement, $32,000 average
Angi's cost guide, updated July 2026, publishes $15,000 to $75,000 as its headline finishing range with a $32,000 average across project sizes.
Angi, How Much Does It Cost to Finish a Basement (2026)$25–$65 / sq ft
HomeGuide's typical finished-basement cost per square foot
HomeGuide's estimate of $25 to $65 per square foot, or $12,500 to $37,500 for typical sizes, sits between HomeAdvisor's basic range and Fixr's full-remodel range. Use it as a middle-of-the-road benchmark when comparing bids; this figure comes from the guide's 2025 summary.
HomeGuide, Cost to Finish a Basement (2025)$20,000–$30,000
Adding a bathroom to a basement costs about $20,000 to $30,000
Fixr's basement remodeling guide prices a new basement bathroom at $20,000 to $30,000 because it usually needs an ejector pump or below-grade plumbing rough-in. It is the single biggest scope decision in most basement budgets.
Fixr, Basement Remodeling Cost (2025)119 markets
Basement remodels were the most consistent performer across 119 U.S. markets
In Zonda's 38th annual Cost vs. Value Report, covering 28 projects in 119 local markets, basement remodels were the newly added project described as proving most consistent nationwide. Homeowners in basement-heavy regions can expect returns close to the national figure.
Zonda / PR Newswire, 38th Annual Cost vs. Value Report release (2025)Angi's 2026 guide reports a typical basement finish at $15,000–$75,000 with a $32,000 average; HomeAdvisor reports the same average with basic finishing at $7–$23 / sq ft; Fixr sets $50,000 for a complete 900-square-foot remodel. Those figures describe different scopes, and this calculator exists to let you build your scope and see which figure you are heading toward before a professional prices it.
The base rate is a mid-grade national figure per finished square foot. Tiers move it for finish quality; complexity moves it for how many rooms and how much plumbing and mechanical work the layout demands; add-ons are flat amounts from published guides. Read the assumptions under the result, then take the figure to the estimate request.
How does the calculator build a basement estimate?
It starts with finished square footage times a base of $42 per square foot, a mid-grade figure inside HomeGuide's $25 to $65 range and consistent with Angi's $32,000 average on a typical 750-square-foot finish. The finish tier multiplies that: a basic tier for drywall, luxury vinyl plank and standard lighting; a mid tier with better doors, trim and tile in wet areas; a premium tier with custom millwork, engineered flooring and designer fixtures. Complexity then reflects layout: an open room, standard partitioned rooms, or a suite with a bedroom and bathroom.
Add-ons are where basement budgets really move, and they are priced from named guides: a basement bathroom at $25,000 (Fixr, $20,000–$30,000), an egress window at $3,500 (Fixr), interior drainage and sump at $4,900 (Bob Vila citing Angi), radon mitigation at $1,000 (HomeAdvisor), a wet bar and a backup sump. A permit line at HomeAdvisor's $1,200–$2,000 is included in the assumptions rather than as a toggle, because a permitted job is the only kind worth pricing.
| Input | What it represents | Anchor |
|---|---|---|
| Base rate | $42 per finished sq ft, mid-grade | HomeGuide $25 to $65; Angi $32,000 average |
| Basic tier | 0.7x: drywall, LVP, standard lighting | HomeAdvisor basic $7 to $23 per sq ft |
| Premium tier | 1.45x: custom millwork, engineered floors | Fixr complete remodel up to $90 per sq ft |
| Suite complexity | 1.3x: bedroom, bathroom rough-in, more partitions | Fixr, Zonda CVV specification |
| Bathroom add-on | $25,000 flat | Fixr $20,000 to $30,000 |
| Egress window add-on | $3,500 flat | Fixr 2025 average |
What does the calculator leave out, and why?
It leaves out structural repair, foundation crack injection, exterior excavation, stair rebuilds, panel upgrades and asbestos or lead abatement in older houses, because each depends on conditions only a site visit reveals. It also leaves out furniture and media equipment, which are not construction. And it uses national figures; coastal metros run higher and some interior markets lower. Zonda's finding that basement remodels are the most consistent project across 119 markets suggests the regional swing is smaller than for most projects, but it is not zero.
The calculator also assumes a dry basement. If water has ever appeared, select the drainage add-on and read the waterproofing page; if there is any chance of a bedroom, select egress. If headroom is under 7 feet 4 inches, expect the ceiling and duct work to add cost the calculator cannot see. The quiz flags those conditions before you rely on the number.
How should you use the result when comparing estimates?
Bring the inputs and the total to each site visit and ask the pro to walk through where their scope differs. A bid 20 to 30 percent under the calculator on the same scope deserves a line-by-line look at allowances, egress and drainage; a bid far above it should be able to point to a specific condition or a local labor rate. Opendoor's guide reminds you that below-grade space appraises at 50–70% of upstairs value, so keep the total in proportion to the house.
Then decide what to phase. Houzz's 2025 study found 84 percent of renovating homeowners paid from savings and only 6% used a HELOC, and Fixr prices a basement bathroom at $20,000–$30,000 and an egress window at $3,500 on average, two add-ons that move the total most. If the total lands above your comfort, the comparison pages show which add-ons can be roughed in now and finished later without reopening walls, and the polls show what others cut first.
A worked example: 750 square feet, mid-grade, with a bathroom and egress
Take a common project: a 750-square-foot family room and guest bedroom with a bathroom, mid-grade finishes, partitioned rooms. The base is 750 times $42, or $31,500, close to Angi's $32,000 average. The mid tier leaves it there; the partitioned complexity leaves it there. Add the bathroom at $25,000 and the egress window at $3,500 and the estimate reaches about $60,000, which is inside Angi's $15,000 to $75,000 range and above Zonda's $52,012 midrange specification, as it should be, because Zonda's project has no bathroom or bedroom.
Now drop the bathroom to a rough-in and defer the bedroom: the total falls back near $32,000 and the room becomes a family room with a future. That is the decision the calculator is built to show. The same 750 square feet in a coastal metro with a wet history and 7 feet 3 inches of headroom would carry drainage, a drywall ceiling around rerouted ducts, and higher labor, and only a site visit prices those. Use the tool to set expectations, then let the service pages refine them.
| Line | Amount | Anchor |
|---|---|---|
| 750 sq ft at $42, mid tier, partitioned rooms | $31,500 | HomeGuide $25 to $65; Angi $32,000 average |
| Full bathroom with ejector pump | $25,000 | Fixr $20,000 to $30,000 |
| Egress window and well | $3,500 | Fixr 2025 average |
| Estimate with bathroom and bedroom | About $60,000 | Inside Angi's $15,000 to $75,000 range |
| Same room, bathroom roughed in only, no bedroom | About $32,000 | Angi average |
Homeowner polls
What other homeowners budgeted
What is your plan for a basement bathroom?
Fixr prices a basement bathroom at $20,000 to $30,000 because of below-grade plumbing.
No votes yet. Yours will be the first. · saved on this device
Cost calculator questions
Why is the calculator's base rate $42 per square foot?
Because it sits in the middle of the published mid-scope ranges: HomeGuide's $25 to $65 per square foot, and Angi's $32,000 average which at a typical 750-square-foot finish is about $43 per foot. HomeAdvisor's $7 to $23 basic range and Fixr's $30 to $90 remodel range bracket it on either side. The tier multipliers move the effective rate across that whole span so the tool covers a shell finish and a full remodel.
Does the estimate include the permit?
Yes, as an assumption rather than a toggle. HomeAdvisor reports basement permits generally cost $1,200 to $2,000, and the result assumes roughly that amount is inside the total. Unpermitted work is not priced because it is not recommended: it creates safety risk, complicates resale and can void insurance claims. Ask each professional to show the permit and inspection fees as a line item in the written proposal.
How much does adding a bathroom change the basement estimate?
It is the largest single add-on. Fixr prices a basement bathroom at $20,000 to $30,000, driven by the sewage ejector pit cut into the slab, the vent path, and the water supply, before tile and fixtures. The calculator uses $25,000. If a bathroom is likely later but not now, ask for a rough-in: ejector pit, drain stubs, vent and supply capped under the slab, which costs a fraction and avoids demolition.
Should I select the drainage add-on if the basement has only been damp once?
Yes, at least to see the number. Bob Vila's guide, citing Angi, puts a typical interior drainage and sump job at $4,920 on average, and the Insurance Information Institute reports water and freezing made up 22.6% of homeowners claims in 2023. Once damp usually means the conditions can recur. The professional's diagnosis may conclude that gutters and grading solve it for far less, but budgeting for drainage and not needing it beats the reverse.
Why is the premium tier only 1.45 times the base?
Because finishes are a smaller share of a basement budget than most homeowners expect. Framing, insulation, electrical, HVAC, plumbing and drywall consume most of the money at any tier; premium flooring, millwork and fixtures add to it but do not double it. Fixr's complete-remodel top of $90 per square foot is about twice the mid figure and includes bathrooms and kitchens, which the calculator prices as add-ons instead.
How long will the project the calculator prices take?
The calculator assumes about four working days per 100 square feet at moderate complexity, which puts a 750-square-foot finish near six weeks of construction, inside Angi's three-to-eight-week range. Add plan review and permits ahead of that and inspections during it, and the whole project runs three to four months. A bathroom, egress excavation or duct rerouting each adds a week or more, mostly through inspection sequencing.
Can I use the calculator for a media room or a partial finish?
Yes. Enter only the square footage you intend to finish, choose the mid or premium tier for a theater, and use the standard-rooms complexity if the room is enclosed. Theater-specific items such as isolation ceilings, conduit and risers are not separate toggles; the media room page lists their typical ranges so you can add them by hand. For a partial finish, remember the shared infrastructure, such as HVAC extensions, still applies.
More free tools
Free toolBasement comparisons: the five decisions estimators get asked about mostSide-by-side tables for the decisions that change the price most.
Free toolIs your basement ready to finish? Take the readiness quiz9 questions that show what you already know and what to check next.
Free toolBasement polls: how other homeowners are weighing the same choicesSee what other planners chose and add your vote.
Price a specific service
Service guideComplete Basement FinishingComplete basement finishing converts unfinished below-grade space into insulated, heated, code-compliant rooms with finished walls, ceilings, floors, lighting and often a bathroom.
Service guideBasement WaterproofingBasement waterproofing is the diagnosis and management of water entering or condensing in a basement, using grading and gutter fixes, interior drainage with a sump, exterior membranes and drains, crack injection, or dehumidification.
Service guideHome Theater & Media RoomsA basement home theater or media room is a finished lower-level space planned around one screen, fixed seating, controlled lighting and sound that stays downstairs, with conduit, dedicated circuits, equipment cooling and isolated framing installed before drywall.
Ready to price your basement finishing?
Tell us the size, the condition of what is there now, and what you want to change. Basement Scope passes your request to independent local professionals, who reply with written, no-obligation estimates. The service is free to use.