Cal. Civil Code § 1102.6h

(a) A seller of a single-family residential property who accepts an offer for the sale of the single-family residential property within 18 months from the date that title for the single-family residential property was transferred to the seller shall disclose, in addition to any other disclosure required pursuant to this article, to the buyer both of the following: (1) Any room additions, structural modifications, other alterations, or repairs made to the property since title to the property was transferred to the seller that were performed by a contractor with whom the seller entered into a contract. (2) The name of each contractor with whom the seller entered into a contract with for the room additions, structural modifications, other alterations, or repairs disclosed in paragraph (1) and any contact information for the contractor provided by the contractor to the seller. The obligation to provide the name of the contractor shall only apply to contracts where the aggregate contract price for labor, material, and all other items for the project or undertaking is in excess of the dollar amount specified in Section 7027.2 of the Business and Professions Code. (b) The seller’s obligation to disclose the room additions, structural modifications, other alterations, or repairs made to the property performed by a contractor may also be satisfied by providing a list of room additions, structural modifications, other alterations, or repairs performed by, and provided by, the contractor with whom the seller contracted for the room additions, structural modifications, other alterations, or repairs. (c) (1) If the seller obtained a permit for any room additions, structural modifications, other alterations, or repairs provided to the buyer pursuant to subdivision (a), the seller shall provide a copy of the permit to the buyer. (2) If the seller contracted with a third party for any room additions, structural modifications, or repairs, and the seller was not provided with a copy of any permits obtained, the seller may satisfy the obligation in paragraph (1) by informing the buyer that any information on permits may be obtained from the third party and providing the contact information for the third party provided by the third party to the seller. (d) This section shall apply to the sale of a single-family residential property where the seller accepts an offer from a buyer to purchase the property on or after July 1, 2024.