A Residential Sublease Agreement is a contract between an existing tenant (the sublessor) and a new occupant (the sublessee or subtenant) that allows the sublessee to live in all or part of the rental property for a specified period while the original tenant retains their lease with the landlord. The sublessor remains legally responsible under the original lease, meaning they are liable for any rent the sublessee fails to pay and any damage the sublessee causes to the property. This creates a triangular legal relationship between the landlord, original tenant, and sublessee.

Residential subleasing is governed by state landlord-tenant statutes and the terms of the original lease. Most residential leases either prohibit subleasing entirely or require the landlord's prior written consent. Under the Restatement (Second) of Property Section 15.2, these consent requirements are generally enforceable. However, some jurisdictions provide tenant protections. New York City's Real Property Law Section 226-b grants tenants in buildings with four or more units the right to sublease with landlord consent, which cannot be unreasonably withheld. San Francisco's Rent Ordinance similarly restricts landlords from unreasonably withholding sublease consent in rent-controlled units.

The legal distinction between a sublease and an assignment is critical. In a sublease, the original tenant retains a reversionary interest (the right to return after the sublease term ends) and remains in privity of estate with the landlord. In an assignment, the original tenant transfers all remaining rights under the lease to the new tenant. Courts examine the substance of the arrangement rather than the label the parties use, so a document titled as a sublease may be treated as an assignment if it covers the entire remaining lease term.

A residential sublease agreement is most commonly needed when a tenant needs to leave their rental temporarily but wants to maintain their lease rather than break it. College students leaving for summer break, study abroad programs, or internships in other cities frequently sublease their apartments to avoid paying rent on unoccupied space while preserving their housing for when they return. Tenants relocating temporarily for work assignments, military deployments, or family caregiving obligations use subleases to cover their rent obligations during their absence.

Tenants who want to share their apartment with a roommate who is not on the original lease need a sublease agreement to formalize the arrangement, even when the landlord has approved the additional occupant. This protects the original tenant by documenting the sublessee's financial obligations and house rules. Tenants in rent-controlled or rent-stabilized apartments have particular incentive to sublease rather than terminate their lease, as they would lose below-market rental rates that cannot be recaptured.

Couples separating where one partner wants to stay in the shared rental may use a sublease structure when the departing partner is the named tenant on the original lease. Tenants who need to break their lease early may sublease for the remaining term to avoid early termination penalties, which can include liability for rent through the end of the lease term or forfeiture of the security deposit. In jurisdictions that impose a duty to mitigate damages on landlords, a ready sublessee strengthens the tenant's position in negotiating a lease termination.

A residential sublease agreement must identify the property address, unit number, and the specific rooms or areas the sublessee is authorized to occupy, particularly in partial sublease situations where the sublessor retains use of certain areas. Include the sublease start and end dates, which must fall within the remaining term of the original lease, and specify whether the sublease is for a fixed term or converts to a month-to-month arrangement. Attach a copy of the original lease and the landlord's written consent to sublease as exhibits.

Rent provisions should state the monthly sublease rent, the due date, acceptable payment methods, grace period, and late fee amount. Clarify whether the sublessee pays rent to the sublessor or directly to the landlord, and specify responsibility for utilities, internet, parking, and other recurring expenses. Address the security deposit amount, which is subject to the same state security deposit statutes that govern the original lease, including deposit limits (many states cap deposits at one to two months' rent), permissible deductions, and return timelines. In California, Civil Code Section 1950.5 limits residential security deposits to two months' rent and requires return within 21 days of vacating.

The sublease must incorporate the original lease terms that bind the sublessee, including noise restrictions, pet policies, parking rules, guest policies, and prohibited activities. Specify the condition of the property at sublease commencement using a move-in inspection checklist with photographs, and define the sublessee's obligation to return the property in the same condition less normal wear and tear. Address the sublessor's right to enter the subleased premises for inspections, which must comply with state notice requirements (typically 24 to 48 hours advance notice). Include provisions for early termination by either party, consequences of sublessee default including eviction procedures that must follow state landlord-tenant law, and the sublessor's remedies if the sublessee abandons the property before the sublease term expires.