The principle that no one may

Application pratique:

Under the estoppel principle, the landlord may be barred from evicting if the tenant can prove they reasonably relied on the promise to their detriment (e.g., emails, texts, or witness statements from rejected landlords). The tenant should immediately gather all evidence of the assurance and file a legal challenge within the statutory 2-month notice period. Consulting a property lawyer promptly can prevent costly litigation and secure the lease renewal.

Application pratique:

The seller’s contradictory claim may be inadmissible if the buyer relied on the written assurance to their detriment. The buyer should preserve the seller's statement (letter, email) and evidence of the reduced value (estate agent valuation). They can invoke the principle to seek damages or cancellation of the sale. Urgently instruct a solicitor to send a formal notice of claim, as prescriptive periods for hidden defects are short (2 years from discovery).

Application pratique:

The co-owner’s challenge may be declared inadmissible under the contradiction principle because their initial vote misled other co-owners into incurring expenses (e.g., signed contracts, architect fees). The syndic should argue that the co-owner’s change of position detrimentally affected the community. Document the vote record and the financial commitments made in reliance on it. Seek a swift court ruling to prevent further delays, and stress that preventive legal review of AGM procedures costs far less than litigation.