Basement Renovation Cost: Published Ranges and Peterborough's Permit Fees

The short answer

Two published Canadian guides put a basement renovation cost at roughly $35 to $100 per square foot. Zoocasa says $35 to $75 in 2025. HomeStars says $50 to $100 in 2026. That is a range, not a quote. A bathroom, plumbing and electrical work, ceiling height, a way out for any bedroom and the condition of the walls can all move the number. The only way to get a real figure is to have someone look at the space.

A range doesn't tell you what your own basement will cost. This page adds what a range leaves out: the City of Peterborough's 2026 permit fees, a worked example with the arithmetic shown, the items that change a basement price, and what an itemised quote should list. Every figure below comes from a named source.

What the published guides say

The figures below are what the two guides showed on October 27, 2026.

The two guides don't count the same things in a per-foot figure. Zoocasa lists permits among what its range covers, while HomeStars lists them as a separate cost. Zoocasa also says Toronto and Vancouver run higher, often $70 or more per square foot, and smaller cities and rural areas closer to $35 to $45.

Neither guide gives a number for Peterborough, and neither says whether its figures include HST. HomeStars' city table lists Barrie and Oshawa at $10,000 to $50,000 and Toronto at $15,000 to $65,000. The guide does not explain how those totals relate to its $50 to $100 per square foot range. Neither guide shows how many basements stand behind its figures or how it got them, so this page can't show that the two are independent of each other. Treat the ranges as approximate. They are not proof of a price, or of what a Peterborough-area basement will cost.

A worked example, with the arithmetic

Say your basement is 786 square feet. That figure comes from CMHC's report on secondary units in Ontario. Its Table 1 gives 786 square feet as the average floor area of existing basement apartments in Peterborough, from 2019 property data. Your basement may be bigger or smaller, so this is a hypothetical, not an estimate for your house.

Together the two cover about $27,500 to $78,500. The top of that is above every Ontario row in HomeStars' own city table, so treat it as the far edge, not a likely middle. Three more things can sit on top:

• A bathroom. If a quote prices it on its own line, HomeStars says a basement bathroom adds $8,000 to $20,000. Zoocasa says adding a bathroom, kitchen or laundry adds $5,000 to $15,000 or more for plumbing and electrical. The two cover different scopes, so use one figure or the other, not both.
• The permit. The next section works it out from the City's own rates. Ask whether a quote has it inside the per-foot figure.
• HST. Ontario's HST rate is 13% (CRA). If a range turns out to be before tax, 13% adds about $3,600 to the low end of this example and about $10,200 to the high end. Ask any quote to say whether HST is in the number.

What the City charges for the permit

The City of Peterborough says a building permit is required for any construction in your basement. Its Basement Finishing Guide lists drywall, plumbing fixtures, new rooms and insulation, and leaves painting and decorating off the list. Its 2026 fee schedule has two residential rows:

The schedule doesn't say which row a basement finish uses, or how the City sets construction value, so ask Building Services before you budget. Here is what each row gives, worked out from the published rates:

These totals are hypothetical. The guides' own permit figures are $500 to $2,500 (HomeStars) and $1,000 to $3,000 for permits and inspections (Zoocasa), so the City's rates land in the same area. A separate fixed-fee row lists a plumbing and mechanical permit for ten fixtures or fewer at $146, or $271 for more, each plus the $62.50 administrative fee.

The City fee is not the whole permit bill. Electrical work is reported to the Electrical Safety Authority by a notification of work, which it also calls a permit. You may draw the plans yourself, or hire a designer with a BCIN (Building Code Identification Number) House qualification, which is another line. A revision fee may apply if the design changes after the permit is issued.

Outside the city limits a different office issues the permit, and renovation permits around Peterborough lists them. What the City asks you to submit is in finishing a basement in Peterborough. Rules and fees differ by property and change, so confirm with the City before you start.

What moves the price

Beyond size, these lines change a basement price.

• A bathroom and the slab under it. HomeStars says most of a basement bathroom's added cost is plumbing rough-in (the pipework done before the finishes), because drain lines have to be cut into the concrete slab when none is in place. The City's guide treats any plumbing, sump pits included, as Part 7 Building Code work, and says a plumber you hire must be licensed with the City. Building Services can confirm that if you ask.
• A bedroom needs a way out. The City's guide says a basement level with a bedroom needs a door to the outside or an egress window (one you can get out through in an emergency), and that a window well needs frost cover for the foundation. The sizes are in the permit and egress page.
• Ceiling height. The Ontario Building Code sets minimum heights for finished rooms, and the City's guide lists them, with alternatives for houses more than five years old (not secondary suites). HomeStars lists very low ceilings, which may need underpinning (deepening the foundation), among the factors that push a total higher.
• Moisture. HomeStars says water problems should be dealt with before any finishing starts. A finishing quote should say what it assumes about moisture, and a repair is a separate price.
• Heat, air and wiring. The City's guide says each basement room needs a heat source and supply and return air, a bathroom needs mechanical exhaust vented to the exterior, and smoke and carbon monoxide alarms must be hard-wired with battery backup.
• Insulation. For houses five years or older, the City's guide sets no required insulation value but says existing insulation must be maintained. Ontario's Home Renovation Savings program lists rebates of up to $7,700 for insulation (attic, wall, foundation, exposed floor) and up to $250 for air sealing. They are for upgrades that start with a home energy assessment and include two or more upgrades. Check the terms before work starts.
• Failed inspections. The City lists common deficiencies, such as a layout that differs from the approved plans, a ceiling that is too low and stair risers that are no longer uniform. It says missing a required inspection may mean removing finishes so it can happen.

If the basement will be a suite

A legal suite costs more than a finish. Zoocasa says it can take a total past $100,000, and HomeStars says suites can push a project well above its ranges. The City's rules for a suite are a different decision, set out in building a basement suite in Peterborough. The money side is in paying for a basement suite in Ontario.

Will it pay back when you sell?

None of the sources here gives a return figure for Peterborough. The Appraisal Institute of Canada's consumer guide to the appraisal process (2023) says the return on a renovation "tends to vary from market to market" and is set by what buyers and sellers do in the local market. It also says "It is uncommon to fully re-coup the amount you paid for a renovation." It gives no percentage, and it says appraisers can advise on the contributory value of a proposed renovation (what it adds to the property's value).

The two cost guides do give numbers for basements, and both are estimates with no method shown. HomeStars says a finished basement generally adds back 50% to 75% of the renovation cost in resale value. Zoocasa says finishing a basement can recoup 50% to 70% in most Canadian markets. Treat each as that guide's estimate, not as a fact about Peterborough or your house.

How long it takes

Two published sources disagree, so this page doesn't average them. HomeStars says a basic basement finish typically takes four to eight weeks, and a full renovation with a bathroom, kitchen or suite three to five months, particularly when permits and staged inspections are involved. CAA North & East Ontario's magazine, in an article quoting a Vaughan basement contractor, says most basement finishes take about three to four weeks and a legal basement apartment about six weeks, plus time for inspections. Treat both as typical, not as a promise for any one house.

Two time limits are written into the Building Code. The wording below is from the Ontario.ca compendium as of October 27, 2026, which reflects amendments up to O. Reg. 242/26 (July 22, 2026). O. Reg. 325/26, filed October 2, 2026, changed the date of the Ontario amendments document that the Code adopts, from July 17, 2026 to October 1, 2026. The compendium home page doesn't list it, so confirm the current wording with the City.

The permit. For a house where no dwelling unit sits above another, the building official has 10 days to issue the permit or refuse it in writing (Division C, Article 1.3.1.3). Saturdays, holidays and days the office is closed don't count. The clock starts the day after a complete application is in and the fees due at application are paid. The official isn't held to the 10 days if, within two days, they find that required plans are missing or that the work would break an applicable law, and say so in writing. A basement suite may fall in a different class of building, so ask the City which period applies.

The inspection. After the permit, an inspector must carry out the inspection within two days of your notice (Article 1.3.5.3). The inspector may do it by other means instead of attending in person. Again, Saturdays, holidays and closed days don't count. The City's guide asks for at least 48 hours' notice.

The inspections also set the order of work. The Code lists the stages at which the permit holder must give notice, including framing and heating ductwork, insulation and vapour barriers, air barriers, and drains and plumbing. A municipal by-law may add more stages (Article 1.3.5.2). The City's guide says to pass each inspection before starting the next phase.

What an itemised quote should show

Quotes are easier to compare when these are separate lines, or when a written note says they are included:

• the permit and administrative fee, and who applies and pays;
• drawings, and who prepares them;
• plumbing, including any cutting of the slab, and the plumber;
• electrical work, the Electrical Safety Authority notification of work (which it also calls a permit) and the alarms;
• heating, ducts and bathroom exhaust;
• an egress window and well, if there is a bedroom;
• insulation and air sealing;
• what the quote assumes about moisture, and what happens if the walls turn out to be damp;
• finishes as allowances, so flooring, doors and fixtures can be compared;
• whether HST is in the number;
• who books the inspections, and what happens if one fails;
• how a change after the permit is priced.

Getting a real number

A range can't see your slab, your ceiling or your walls. Gilbert Brothers gives a free estimate at your home, with a quote for the whole job before work starts, and replies to an inquiry within one business day. Send one from the contact page or read about basement renovations.

Frequently asked questions

Do these prices include HST?+

Neither guide says. Ontario's HST rate is 13% according to the CRA, so ask any quote to say whether HST is in the number.

How much is a building permit to finish a basement in Peterborough?+

The City's 2026 schedule charges an administrative fee of $62.50 plus $34.00 per $1,000 of construction value on residential alterations without identifiable gross area, with a $235 minimum permit fee. It does not say which row a basement finish uses, so ask Building Services at City Hall before you budget.

Should I keep money aside for surprises?+

Yes. CMHC says it is a good idea to set aside money for unexpected costs, so you can adjust your plans without renegotiating your finances or reapplying for new funds (CMHC). Ontario.ca adds that changing plans in the middle of a project will cost extra money (Ontario.ca). Neither gives an amount, so this page doesn't suggest one.

Is finishing a basement worth it?+

That depends on what you count as payback. The Appraisal Institute of Canada's brochure on valuing renovations says payback is measured three ways: the value of increasing the selling price, the value of enjoying the renovated space, and the value of maintaining the worth of your property. Its "Top 5" list for enjoyment value includes basement finishing, and its "Top 5" list for return on investment does not. What the AIC and the cost guides say about resale is in the section above.

Will I get my money back when I sell?+

The Appraisal Institute of Canada says the return tends to vary from market to market and that it is uncommon to fully re-coup the amount you paid for a renovation. HomeStars (50% to 75%) and Zoocasa (50% to 70%) give estimates for basements with no method shown. None of them is a Peterborough figure.