D.C. Mun. Regs. tit. 16, r. 16-630
All consumer goods repair dealers shall display a sign, designed and approved by the Department, summarizing the major requirements which govern the consumer goods repair industry in the District. The sign shall be conspicuously posted in the business transaction areas of all repair service facilities.
Prior to making any home visit for the purpose of making repairs or estimating the cost of repairs, a consumer goods repair dealer shall fully disclose any service charge or other fees which will be imposed whether or not repair services are performed.
A consumer goods repair dealer may reserve the right to require customers to authorize in writing any substantive changes in or additions to repairs authorized by the customer.
If there is a dispute between the customer and the consumer goods repair dealer regarding charges, adequacy of service, or compliance with any of the provisions of this chapter, the consumer goods repair dealer shall have a lien by operation of law on the goods, if the customer refuses to pay the charges itemized on the written estimate, until the dispute has been resolved by referral to and action by the Department, as provided in §§ 620 through 623, unless the customer posts a bond or security according to rules promulgated by the Department.
If a repair dealer subcontracts repair services on consumer goods or parts of those goods to other consumer goods repair dealers, the original dealer shall be responsible and liable for the quality and adequacy of the subcontracted work and all of the parts involved.
If a new part is installed in making repairs, the warranty card covering the new part, if any, shall be delivered to the customer by attaching the warranty card to the final bill.
D.C. Mun. Regs. tit. 16, r. 16-630