A contract-holder may, with the consent of the landlord that cannot be unreasonably withheld or be subject to unreasonable conditions, make another person a joint contract-holder under the contract.
Ar ôl cael cydsyniad y landlord, na ellir ei wrthod yn afresymol na rhoi amodau afresymol ar y cydsyniad hwnnw, caiff deiliad contract wneud person arall yn gyd-ddeiliad contract o dan y contract.