Use this form when the seller is agreeing to stop actively marketing their home while the buyer tries to sell their current property. A sales contingency is when you will need to sell your current home in order to close on the house you're offering to buy.The contingency clause gives a party to a contract the right to renegotiate or cancel the deal if specific circumstances turn out to be unsatisfactory. In real estate, contingent describes a transaction that's currently in place but will only be completed if specific conditions are met. Real estate contracts in Philadelphia typically include several contingencies, such as financing, inspection, and appraisal contingencies. The home sale contingency clause can be complicated to both structure and present to your buyer or seller. A contingency is a clause in a real estate purchase agreement that specifies a requirement or action that must be met to make the contract legally binding.