Can a BC seller back out after accepting an offer?

Direct answer

Generally no. Once a Contract of Purchase and Sale is unconditionally accepted, both sides are legally bound to complete, and a seller who walks is in breach. Unconditional means the buyer has removed every subject and the seller has signed. A seller in breach is exposed to: (1) specific-performance lawsuits from the buyer (BC courts have ordered specific performance, i.e. compelled the seller to convey title, for residential transactions where the property is unique, though this remedy is granted less often than damages); (2) damages equal to the buyer's actual losses, typically the difference between the contract price and a higher market price the buyer must pay to acquire equivalent property, plus consequential losses (rent during delay, alternative-housing costs, legal fees). The Home Buyer Rescission Period (HBRP, BC since January 3, 2023) is a BUYER's right; the seller has NO equivalent rescission right. Three narrow exceptions where a seller may legitimately back out: (1) the contract itself is void for fraud or material misrepresentation by the buyer; (2) a subject condition that survives buyer acceptance is not met (e.g., a "subject to court approval" or "subject to probate" provision); (3) the buyer materially breaches first (e.g., fails to deposit the earnest money or fails to complete on the agreed date). Most BC seller "I want out" requests are renegotiation tactics: a strong buyer's lawyer letter usually closes the deal at the original price.