Buying a House Without an Inspection:
Renovation Costs You'll Eat

A young couple bought a 1947 brick semi in Hintonburg last spring. They waived inspection because the seller had two other offers. Six weeks after closing they called us to quote a kitchen remodel. We opened the wall behind the stove and found knob-and-tube splices, a cracked cast-iron stack, and a sister joist someone bolted in with deck screws.

That kitchen quote climbed sharply before we touched a single cabinet, because the hidden repairs came first. They paid for those repairs because they had no inspection report to negotiate against. The seller was gone with the money.

This is the most expensive corner Ottawa buyers cut in 2026. A modest inspection fee routinely surfaces deep, deferred repair items worth many times what the inspection costs. Skip it and the math gets ugly fast.

What an Ottawa inspector actually catches

A good Ottawa inspector spends three to four hours in the house. They are looking for the items that are expensive to fix and invisible to a buyer doing a 20-minute walkthrough. Knob-and-tube wiring, polybutylene supply lines, asbestos vermiculite insulation, cracked drain stacks, foundation parging hiding spalled concrete, soft sub-floor under the bathtub, and improper attic ventilation.

None of those show up in MLS photos. All of them are five-figure repairs once you own the house. The inspector does not fix them. They write them down so you can either lower your offer, ask for credit, or walk away.

What an inspection report flags, and what drives the repair cost

A typical Ottawa inspection report flags eight to fifteen items. Most are minor. Two or three are usually significant. Here are the items inspectors most often flag in Ottawa houses we work on, and what makes each one expensive to fix:

• Knob-and-tube replacement, full house: cost driven by the permit and ESA inspection, wall access, and how much fishing of new wire the old plaster allows.
• Galvanized to PEX supply re-pipe: driven by home size, the number of fixtures, and access to the runs behind finished walls.
• Cast-iron stack replacement, basement to roof: driven by stack height, how it is boxed in, and roof penetration work.
• Asbestos vermiculite removal from attic: driven by access, abatement protocol, and the volume of material.
• Foundation crack repair with interior weeping tile: driven by the length of wall, depth of excavation, and whether the slab must be opened.
• Roof deck replacement with shingles: driven by deck condition, roof pitch, and layers to be torn off.
• Soft sub-floor and joist sistering under a bathroom: driven by the extent of rot and how much finished surface must come up to reach it.

Why Ottawa houses are riskier than the national average

Half the housing stock inside the Greenbelt was built between 1900 and 1965. The Glebe, Centretown, Sandy Hill, Old Ottawa South, New Edinburgh and most of Westboro are full of homes with original wiring updated piecemeal, original galvanized supply lines hidden behind one renovation, and original cast-iron stacks that have been sitting in damp clay basements for 80 years.

The post-war suburbs (Alta Vista, Nepean, parts of Orleans) are the next risk pocket. Aluminum branch wiring was used between roughly 1965 and 1976. Insurance companies will deny coverage in Ontario if aluminum is not pigtailed with COPALUM connectors at every device. That re-work alone is a four-figure cost driven by the number of devices in the house.

We have never opened a wall in a pre-1965 Ottawa house and found nothing. The question is only whether the surprise is a small fix or a major one.

The "as-is" trap in hot markets

In bidding wars (Glebe, Westboro, parts of Old Ottawa South in 2024 to 2025), buyers waived inspection to win. Sellers' agents normalized it. The buyers convinced themselves they would deal with issues after closing.

What happens after closing: insurance companies ask for an underwriting inspection within 30 to 60 days. They find the knob-and-tube. They give you 90 days to remediate or they cancel coverage. You cannot get a mortgage without insurance. You are now paying a five-figure sum in cash to keep your mortgage from defaulting, on a house you just emptied your savings to buy.

This is not theoretical. We see it three or four times a year, every year, since 2018.

What to do if you already bought without one

Stop. Do not start the renovation yet. Hire an inspector or a structural engineer to do the post-purchase walk-through before you sign a renovation contract. We do this for clients regularly. The cost depends on whether you need a basic walk-through or a full structural assessment.

The reason matters: a renovation contractor (us included) is not licensed to assess electrical safety beyond what is in scope. We can flag it during demo, but by then you have already signed a fixed-price contract that does not cover the surprise. The inspection scopes the surprises before the contract is written, so the quote covers them.

For a structural review, see what a proper engineer covers on our Ottawa structural engineering page. For permit-stage requirements before renovation, our building permits page walks through what triggers a City of Ottawa permit and the $117 minimum fee.

Three questions to ask before waiving inspection

If you are still tempted to waive inspection in a 2026 Ottawa bidding war, ask yourself three questions before you sign:

1. Do I have a five-figure cushion of liquid cash beyond closing costs? Without it, you cannot absorb a typical surprise repair.
2. Was the house built before 1980? If yes, the probability of a five-figure surprise approaches 70 percent based on what we open up.
3. Is the basement finished? Finished basements hide moisture, foundation cracks, and unpermitted work. If yes, you need an inspector with a moisture meter and infrared camera.

If you cannot answer all three comfortably, do not waive. Walk if you have to.

What good inspection reports save you

The best save we have seen: a Manotick buyer in 2023 had an inspector flag a sloped basement floor and efflorescence on the foundation wall. Inspector wrote "investigate further." Buyer asked for a substantial repair credit at closing. Seller refused. Buyer walked. Three months later that house went back on the market at a steep discount because someone else found the same issue.

Compare to the Stittsville buyer who waived inspection on a 2008 build "because it is new." It was new. It also had a builder shortcut where the basement floor drain was not connected to the weeping tile. They paid a five-figure sum the next spring to break up concrete and connect it after the basement flooded. Even new houses need inspection.

The fee is one tenth of one percent of the purchase price. The downside of skipping is five to fifteen percent of the purchase price. Nobody who has been through a surprise repair ever skips inspection on the next house. Call 613-862-4555 if you need a renovation contractor to walk a house with you before you bid. We do not charge for the first walk-through.