Maryland Commercial Law Section 13-307
§ 13-307.
  (a)   (1)   In this section the following terms have the meanings indicated.
    (2)   (i)   "Home appliance" means any device the retail cost of which exceeds $100 and which is generally used in a private residence;
      (ii)   "Home appliance" includes an air conditioner, washing machine, dishwasher, television set, stereo set, oil burner, and any similar item.
    (3)   "Repair company" means any person who repairs home appliances for a fee or consideration.
  (b)   Except as provided in subsection (c) of this section, a repair company shall furnish a written bill for the cost of repairing a home appliance to the person for whom the repair was made. The bill shall include the following information:
    (1)   The hourly labor rate;
    (2)   The time actually used to repair the home appliance;
    (3)   The itemized cost of any new parts used to repair the home appliance;
    (4)   The itemized cost of any used or reconditioned parts used to repair the home appliance and a statement that used or reconditioned parts were used; and
    (5)   Any other charges.
  (c)   This section does not apply if:
    (1)   The repair work is done under a service contract; or
    (2)   A flat price or firm estimate is given before repair of the home appliance.