Many include a renewal clause, which provides an option to extend the listing period if both parties agree. Unless otherwise provided in this agreement, the Broker's Fee will be determined on the basis of the sale price (the "Sale Price") or aggregate.Like most contracts, the seller has the right to request a shorter or longer time period if both parties agree. What type of documents give written consent for an intermediary relationship? Expiration, Extension, and Renewal of Listings. A listing agreement is a contract between a real estate agent or broker (the industry professional who will be listing the property for sale) and a home seller. The written listing agreements in real estate must not contain a selfrenewing clause. May be used to amend any Texas REALTORS® Listing Agreement for any reason. Many states do not have a clause that allows the client to cancel the listing agreement unilaterally. Most minor changes can be made right on the contract, but bigger changes might need to be added to an addendum at the end of the agreement.