Tenancies in Singapore sit on a layer of statute over a base of common law contract. The governing instrument for dealings in leasehold interests is the Conveyancing and Law of Property Act 1886 (CLPA), and two of its provisions do the heavy lifting on any transfer. Section 10 provides that the rent and the benefit of the tenant's covenants run with the reversion, and Section 11 binds the obligations of the landlord's covenants to whoever holds the reversion. Together they create privity of estate, the doctrine that makes the burdens and benefits of a lease "run with the land" so that a successor is bound by the covenants without renegotiating them. When you assign a tenancy, you are relying on that machinery to carry the original terms across to the incoming tenant unchanged.
The consent point is governed by Section 17 CLPA, which is easy to overlook and expensive to ignore. Where a lease contains a covenant against assigning without licence or consent, the section implies a proviso that no fine or premium may be charged for granting that consent, though the landlord may recover a reasonable sum for the legal expense of preparing the licence. A landlord who demands a lump sum simply to approve a substitute tenant is acting outside the statute. Separately, if you want a legal (rather than merely equitable) assignment enforceable in the assignee's own name, the assignment must be absolute, in writing and signed, with written notice given to the landlord, tracking the requirements under section 6(c) of the Civil Law Act 1909.
Case law keeps this live. In Century Housing Services Pte Ltd v Koh Chiep Chong [2026] SGMC 11, the court confirmed that a party stepping into a lease inherits both the rights and the ability to enforce the tenant's covenants, including the covenant against unauthorised subletting, and can elect whether to continue or end a predecessor's waiver. The Registry of Deeds and Torrens registration questions are set out by the Singapore Land Authority, and the statute itself is available in full through the Singapore Statutes Online record of the Conveyancing and Law of Property Act 1886. Where the premises is an HDB flat, the transfer is additionally constrained by HDB subletting eligibility rules layered on top of the CLPA.