Seller’s Declaration: 12 Critical Points to Verify

The seller’s declaration (DV) is the most underestimated document in a Quebec real estate transaction. This mandatory form, regulated by the OACIQ, requires the owner to disclose every known or suspected issue concerning their property. Yet too many buyers skim over the critical sections without digging deeper. In 2026, with median single-family home prices in Montreal at $560,000 and plexes reaching $855,000 (+9% according to APCIQ, March 2026), a misread can cost tens of thousands of dollars. For a foundational understanding of the form itself, consult our complete guide to the seller’s declaration in Quebec. In this article, we dissect the 12 most critical points that every informed buyer must examine methodically.

1. Foundation Issues

Foundations are the structural skeleton of any building. In the DV, the seller must indicate any known issue: cracks, settlement, infiltration through the foundation wall, or presence of pyrite beneath slabs. A horizontal crack on a concrete foundation wall is particularly concerning, as it indicates excessive lateral soil pressure that can compromise structural integrity. The cost of foundation repair in Quebec ranges between $15,000 and $80,000, depending on the scope of work required. Check whether the seller mentions any previous stabilization work (piles, epoxy injection, exterior waterproofing membrane). The absence of disclosure does not mean the absence of a problem—this is precisely where the pre-purchase inspection becomes essential. Vertical hairline cracks are generally cosmetic, but any crack wider than 3mm warrants professional engineering assessment.

2. Water Infiltration History

Water is a building’s number one enemy. The DV specifically asks whether the seller has observed water infiltration in the basement, walls, roof, or windows. Pay close attention to vague answers or “don’t know” checkboxes. A seller who has lived in the property for five years and checks “no knowledge” regarding basement infiltration while efflorescence stains are visible could be judged in bad faith by a court. Repairs related to water infiltration cost on average between $5,000 and $25,000 for a French drain system, and up to $40,000 for complete exterior foundation waterproofing. Check whether the seller declares the use of a sump pump, which suggests a history of basement water management. Any mention of previous flooding, even from external causes like municipal sewer backups, should prompt further investigation into drainage adequacy.

3. Roof Age and Condition

The roofing section of the DV is often revealing. The seller must indicate the age of the covering, the type of material (asphalt shingles, TPO/EPDM membrane, metal), and any repair history. Asphalt shingles have a lifespan of 20 to 25 years. If the seller declares an age of 18 years, plan for replacement within the next 5 years: expect between $8,000 and $18,000 for a single-family home. For a flat-roof plex, membrane replacement costs between $12,000 and $30,000. Pay particular attention to mentions of previous leaks. Even when repaired, a leak may have caused hidden structural damage such as wood rot and mold in the attic space. Cross-reference the declared roof age with municipal assessment records for consistency.

4. Plumbing: Pyrite, Cast Iron, and Lead

The plumbing system often hides the most expensive surprises. In the DV, look for information about the material of drain and supply pipes. Properties built before 1970 frequently contain cast iron drain pipes (lifespan of 50 to 75 years) that may be at end-of-life. Complete plumbing replacement for a duplex costs between $20,000 and $45,000. The presence of pyrite beneath the basement slab is another major red flag. A pyrite test costs approximately $500, but corrective work (backfill replacement) can reach $50,000 to $100,000. If the seller declares lead supply pipes, be aware that entry pipe replacement costs between $3,000 and $8,000, and some municipalities offer subsidies for this work. Polybutylene pipes (grey plastic, common in 1980s construction) are also problematic due to their tendency to crack and leak without warning.

5. Electrical: Aluminum Wiring and Outdated Panels

The electrical system deserves particular attention in the DV. The seller must indicate the panel capacity (100A, 200A) and the type of wiring. Aluminum wiring, used extensively between 1965 and 1975, presents a fire risk at connection points due to thermal expansion differences with copper outlets and switches. Bringing it to standard costs between $3,000 and $8,000 (anti-oxidant connectors) or $15,000 to $30,000 for complete rewiring. Federal Pioneer brand panels (Stab-Lok series) are recognized for manufacturing defects with breakers that fail to trip during overloads: their replacement costs between $2,500 and $5,000. Some insurers refuse to cover properties with these panels or aluminum wiring, which directly impacts your ability to secure a mortgage at the current 3.69% rate (5-year fixed). A Zinsco panel carries similar risks and should be flagged for immediate replacement.

6. Insulation and Asbestos

Properties built before 1990 may contain asbestos in insulation (Zonolite-type vermiculite), floor tiles, spray-on fireproofing, or plaster joints. The DV asks the seller to declare any knowledge of asbestos presence. Removal of contaminated vermiculite costs between $8,000 and $20,000 for a standard attic. Encapsulation is sometimes a less costly alternative ($3,000 to $6,000), but it does not permanently resolve the issue and may complicate future renovations. Insufficient insulation is also a point to monitor: a poorly insulated property in Quebec can cost $2,000 to $4,000 more per year in heating. Upgrading insulation (spray foam, cellulose) represents an investment of $5,000 to $15,000 depending on the area. With energy costs continuing to rise, this directly affects the property’s total cost of ownership beyond the mortgage payment.

7. Environmental Contamination

The environmental section of the DV is crucial, especially for properties located near former industrial sites, gas stations, or agricultural land. The seller must declare any known soil or groundwater contamination. In Quebec, the contaminated land protection regime imposes remediation responsibility on the property owner, even if they did not cause the contamination. Remediation costs vary enormously: from $20,000 for minor contamination to several hundred thousand dollars for severe cases. Also check for underground heating oil tanks. Tank removal and soil decontamination cost between $5,000 and $30,000. The MELCCFP contaminated land registry is an essential complementary resource that any buyer should consult before finalizing an offer, especially in historically industrial areas of Montreal such as parts of Saint-Henri, Pointe-Saint-Charles, or the eastern industrial corridor.

8. Easements and Servitudes

Easements directly affect the enjoyment and value of a property. The seller must declare any known easement, whether real (registered at the land registry) or personal. The most common easements include rights of way, view servitudes, Hydro-Québec utility easements, and non-construction servitudes. A right of way can prevent the construction of a garage entrance or swimming pool. Public utility easements may limit expansion projects. The certificate of location, which must be less than 10 years old for the transaction, normally reveals these easements, but the DV can provide additional details about their practical daily exercise. A previously undisclosed easement discovered after purchase can reduce property value by 5% to 20% depending on its nature and impact on usability.

9. Renovations Without Permits

This section of the DV is among the most revealing. The seller must declare all major work performed and indicate whether it was completed with the required permits. Unpermitted renovations can lead to costly consequences: the municipality may require compliance or demolition of non-conforming work. A basement finished without a permit may be considered uninhabitable by the insurer, reducing coverage in the event of a claim. For plexes averaging $855,000, a non-compliant basement apartment can represent a loss of rental income of $12,000 to $18,000 per year if the unit must be vacated. Systematically request contractor receipts and permit confirmations for any declared work. Kitchen and bathroom renovations typically do not require permits, but any work involving structural, electrical, or plumbing modifications does.

10. Insurance Claims History

Insurance claims history is a valuable indicator of a property’s health. The DV asks the seller to declare any claims filed with their insurer. Repeated water damage claims suggest an unresolved chronic problem. A major incident (fire, sewer backup) may have left structural aftereffects even after repair. Claims history also affects your future home insurance premium. Some insurers refuse to cover properties with a heavy claims history or impose elevated deductibles. The HITS (Home Insurance Tracking System) registry allows insurers to consult the claims history for an address regardless of the owner. Ask the seller to provide a copy of their insurance statement. Properties with three or more claims in five years can see premium increases of 30% to 50%, adding $500 to $1,500 annually to your carrying costs.

11. Neighbor Disputes and Shared Walls

Neighbor disputes are rarely documented anywhere other than the DV. The seller must declare any current or past litigation with neighbors. The most common issues include encroachments, disputed fences, noise nuisances, and boundary trees. For semi-detached or row properties, the shared wall question is particularly important. A defective shared wall engages the responsibility of both owners. Repair costs for a shared wall (sound insulation, waterproofing, structural work) range between $10,000 and $40,000, shared between the parties. An unresolved neighbor dispute can make the property difficult to resell and reduce its value by 5% to 15%. Active litigation must be disclosed and may affect your ability to obtain title insurance at standard rates.

12. Building Code Violations and CNESST Notices

The final critical point concerns regulatory violations. The seller must declare any non-compliance notice received from the municipality, the Régie du bâtiment (RBQ), or the CNESST. Common violations include non-compliant smoke detectors, blocked emergency exits, non-conforming electrical or plumbing installations, and illegal dwelling units. For income properties, notices from the Tribunal administratif du logement (TAL) can reveal chronic habitability issues. Bringing a property into compliance can cost from a few thousand to tens of thousands of dollars, depending on the nature of the violations. In extreme cases, the municipality can order building evacuation until work is completed, eliminating all rental income during that period. Check with the municipality directly for any outstanding violations on the property.

What “To the Best of My Knowledge” Really Means Legally

The phrase “to the best of my knowledge” that appears throughout the DV does not constitute an absolute shield for the seller. Quebec case law has established that this expression creates a reasonable disclosure obligation. A seller who has lived in the property for several years cannot claim ignorance of an obvious problem such as recurring basement infiltrations or a leaking roof. Courts evaluate the seller’s knowledge against the standard of a “reasonably prudent and diligent seller.” If a seller checks “no” or “don’t know” for a problem they should have reasonably known about, the buyer can invoke fraud (dol) or hidden defects to obtain compensation. The limitation period for hidden defect claims is three years from discovery of the defect, not from the date of purchase.

Strategic DV Analysis Approach

Your DV analysis should be methodical and systematic. Begin by comparing the seller’s answers with your own observations during the property visit. Inconsistencies—for example, the seller declares no renovations while the basement is clearly recently finished—are warning signals that warrant deeper investigation. Cross-reference the DV with the certificate of location to detect undisclosed easements or encroachments. Use the DV as a guide for the pre-purchase inspection: flag for your inspector any points where the seller answered “don’t know” for a thorough examination. With the Bank of Canada rate at 2.25% and variable rates around 3.35%, financing conditions remain favorable in April 2026, but this does not justify rushing a decision without having analyzed the DV in depth. Every dollar saved on due diligence can cost ten dollars in future repairs.

The Financial Consequences of a Neglected DV

Neglecting the DV can transform a good deal into a financial nightmare. Consider a realistic scenario: you purchase a plex at $855,000 with a 3.69% fixed rate over 5 years. Six months after purchase, you discover pyrite beneath the slab, a defective Federal Pioneer electrical panel, and contaminated vermiculite in the attic. Estimated total cost: pyrite ($75,000) + panel ($4,000) + vermiculite ($15,000) = $94,000. These unexpected expenses add to your monthly mortgage payment and can compromise your financial capacity. A hidden defect claim is possible, but legal proceedings take 18 to 36 months on average and cost between $10,000 and $30,000 in legal fees, with no guarantee of success. Prevention is always more cost-effective than litigation.

FAQ

What does “to the best of my knowledge” mean in the seller’s declaration?

This expression obligates the seller to disclose everything they know or should reasonably know. A court may determine that a seller “should have known” if the problem was visible or if they lived in the property for an extended period. It is not an absolute protection against legal recourse.

Can a seller be sued for a false declaration?

Yes. Under Quebec’s legal warranty of quality (articles 1726 and following of the Civil Code of Quebec), the buyer has three years from the discovery of the defect to file a claim. Damages may include repair costs, diminished property value, and moral damages.

How many sections does the OACIQ DV form contain?

The DV form contains dozens of sections covering structure, roofing, plumbing, electrical systems, environment, easements, and more. The 12 points identified in this article represent the most frequently problematic sections based on real estate litigation data.

Can you buy a property without a seller’s declaration in Quebec?

Technically yes, but it is strongly discouraged. Without a DV, the buyer loses a valuable evidence tool in case of hidden defect discovery. Some mortgage lenders may also require the DV before approving financing, and its absence may signal issues the seller prefers not to disclose.

Article written in collaboration with Hamza Taleb, OACIQ-certified real estate broker, RE/MAX. The information presented is for informational purposes only and does not replace professional legal advice.