How much does it cost to finish a basement in Ottawa?

Put in the floor area and get the per-square-foot range an Ottawa renovation company publishes for a finished basement, plus the City of Ottawa building permit fee worked out from the City's own rate.

Free, no email, nothing to submit. Published 2026-08-28 on Ottawa Service Directory.

The finished floor area, not the footprint of the house. The cost source publishes totals at 500, 700, 900, 1,000 and 1,200 square feet, and entering any of those returns its figures.

The City’s three conditions, quoted
  • Under the Building Code Act, a building permit is required for the construction of a new building, an addition, or alteration of any building or structure with a building area of over 10 square metres (approximately 108 square feet).
  • The City publishes a first review target of 5 business days, based on the Council-approved enhanced service level, and asks that inspections be booked 48 hours in advance.
  • For a finished basement the City lists up to seven inspections: excavation, underground plumbing, plumbing rough-in, framing, insulation and vapour barrier, final plumbing, and final.

Quoted from City of Ottawa, Finishing a basement - Do I need a building permit?, read 2026-08-28.

Estimated project cost

$40,510 to $81,020

Basement finishing
$40,000 to $80,000
City of Ottawa building permit
$510 to $1,020
Per square foot
$50 to $100

Construction cost from Done Right Renovations, Basement Renovation Cost in Ottawa (2026): Complete Pricing Guide, published 2026-07-16, read 2026-08-28. Permit fee from City of Ottawa, Comprehensive Building Code Fee Schedule, January 1, 2026, read 2026-08-28: $12.75 per $1,000 or part thereof of the assessed valuation of the work, with a minimum fee of $117.00.

The City defines construction valuation as the total value of all materials, labour, overhead and professional fees for the project, so the finishing cost above is what the fee is worked out on.

A range, not a quote. It multiplies published per-unit figures by the size you entered; it cannot see your site, your access or your soil.

Rated basement renovation companies in Ottawa

19 of the 21 basement renovation companies listed here carry a sourced public rating, and the highest-rated is AMA United Company Inc. at 5.0 stars from 180 Google reviews. They are listed by the published rating score, highest first. No business pays for a listing.

  1. Featured

    AMA United Company Inc.

    Barrhaven +6

    5.0(180)on GoogleChecked Aug 2026Fencing

    AMA United Company Inc. is a fence contractor in Ottawa. Rated 5 from 179 Google reviews.

    View AMA United Company Inc.
    View AMA United Company Inc. directory profile
  2. Featured

    JD Swallow Heating & Cooling

    4.9(1,466)on GoogleChecked Aug 2026Duct Cleaning

    JD Swallow Heating & Cooling is an air duct cleaning service in Ottawa offering heating and cooling. Rated 4.9 from 1466 Google reviews.

    View JD Swallow Heating & Cooling
    View JD Swallow Heating & Cooling directory profile
  3. Featured

    Capital Bathroom Renovation

    Stittsville

    5.0(109)on GoogleChecked Aug 2026Kitchen & Bath Renovation

    Capital Bathroom Renovation is a bathroom remodeler in Stittsville, Ottawa. Rated 5 from 109 Google reviews.

    View Capital Bathroom Renovation
    View Capital Bathroom Renovation directory profile
  4. Featured

    Braden Foundation Construction

    5.0(105)on GoogleChecked Aug 2026Basement Finishing

    Braden Foundation Construction is a waterproofing service in Ottawa offering concrete work and drainage. Rated 5 from 105 Google reviews.

    View Braden Foundation Construction
    View Braden Foundation Construction directory profile
  5. Featured

    Vanguard Contracting

    Kanata +7

    5.0(84)on GoogleChecked Aug 2026Basement Finishing

    Vanguard Contracting is an Ottawa basement renovation company serving homeowners across the city, offering basement finishing and basement renovation. It holds a 5.0-star average across 82 Google reviews.

    View Vanguard Contracting
    View Vanguard Contracting directory profile

  6. Westend Windows and Doors

    Barrhaven +5

    4.9(140)on GoogleChecked Aug 2026Windows & Doors

    Westend Windows and Doors is a door supplier in Ottawa offering window installation and windows. Rated 4.9 from 140 Google reviews.

    View Westend Windows and Doors
    View Westend Windows and Doors directory profile
  7. Featured

    Select Urban General Contractors

    Nepean +6

    5.0(67)on GoogleChecked Aug 2026General Contractors

    Ottawa residential renovation contractor offering full-home, kitchen, bathroom, and basement renovations plus additions, coach houses, and accessible renovations with in-house design and 3D planning. BBB-accredited with an A+ rating and serves neighbourhoods across the city.

    View Select Urban General Contractors
    View Select Urban General Contractors directory profile

  8. Ottawa Bath Renovation

    5.0(55)on GoogleChecked Aug 2026Handyman Services

    Ottawa Bath Renovation is a handyman/Handywoman/Handyperson in Ottawa offering bathroom renovation and heating and cooling. Rated 5 from 55 Google reviews.

    View Ottawa Bath Renovation
    View Ottawa Bath Renovation directory profile

Compare all 21 basement renovation companies in Ottawa · How this order is decided

Where these numbers come from

The range is the one Done Right Renovations publishes for this city: most homeowners can expect to pay between $50 and $100 per square foot for a professionally finished basement. There is no finish-level dropdown on this page because that source publishes one per-square-foot range and no separate rate by finish level.

Filling three dropdown options with multipliers it never printed would make the answer look sharper without making it truer.

How it compares against Ottawa figures

  • A second Ottawa firm publishes roughly double these rates for the same work: $80 to $140 per square foot for a basic basement renovation, $140 to $200 mid-range, and $200 to $300 or more for a custom basement. Both are 2026 Ottawa figures from Ottawa companies. Read the output here as the lower half of what Ottawa quotes actually span, and collect your own.

What this does not know

  • This prints a range, not a quote. One number cannot know your ceiling height, your moisture history, whether the slab has a rough-in, or what a contractor's spring looks like.
  • The encoding is checked against the source's own size table. It publishes $25,000 to $50,000 at 500 square feet, $35,000 to $70,000 at 700, $45,000 to $90,000 at 900, $50,000 to $100,000 at 1,000 and $60,000 to $120,000 or more at 1,200. Type any of those areas above and the same figures come back.
  • A straight per-square-foot multiplication is the weakest part of this. The source says so itself: a larger basement does not always cost more per square foot, and open layouts are often cheaper per foot than a small basement chopped into rooms.
  • Bathrooms, wet bars and rental suites are priced by the source as project totals rather than per-square-foot rates, so they are not applied here. It publishes $50,000 to $80,000 for a basement with a bathroom, $60,000 to $90,000 or more for an entertainment basement, and $80,000 to $140,000 or more for a legal secondary dwelling unit.
  • The permit fee is worked out on the finishing cost as the assessed valuation of the work, which is what the City's own definition asks for. Confirm your valuation and whether you need a permit with the City, or by calling 3-1-1.
  • No business pays for a listing on this directory, including the companies shown below this calculator.

Questions people ask

Do I need a building permit to finish a basement in Ottawa?

Almost certainly. The City states that under the Building Code Act a building permit is required for the construction of a new building, an addition, or alteration of any building or structure with a building area of over 10 square metres, which is about 108 square feet.

Very few finished basements come in under that. Adding a bedroom or a secondary dwelling unit brings egress and fire-separation requirements with it, so confirm your case with the City before framing starts.

How much is the basement permit itself?

The City's Comprehensive Building Code Fee Schedule dated January 1, 2026 charges $12.75 per $1,000, or part thereof, of the assessed valuation of the work, with a minimum fee of $117.00. Valuation is the total value of materials, labour, overhead and professional fees.

On a $60,000 basement that is $765. The rate rounds up to the next whole $1,000, so the $117 minimum applies only at or below $9,000 of construction value, which no full basement finish reaches.

What does it cost per square foot to finish a basement in Ottawa?
Done Right Renovations publishes $50 to $100 per square foot for a professionally finished basement, which is the figure this calculator multiplies. Upland Builds, also in Ottawa, publishes $80 to $140 for a basic finish, $140 to $200 mid-range and $200 to $300 or more custom. Two Ottawa companies, the same year, roughly double apart. Get three written quotes rather than trusting any single published rate.
How many inspections does a finished basement need?
The City lists up to seven, depending on scope: excavation, underground plumbing, plumbing rough-in, framing, insulation and vapour barrier, final plumbing, and final. Inspections must be booked 48 hours in advance, and the permit plans have to be on site for the inspector. Its published first-review target for the permit itself is 5 business days.
Is this an estimate or a quote?
An estimate, and a wide one on purpose. It multiplies a published Ottawa per-square-foot range by the area you enter and adds the City's permit fee. Use it to read the quotes you collect, then get those quotes from the companies listed below.

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