In almost every case, yes — you have to tell your landlord if someone is moving in with you. Standard residential leases include an occupancy clause, a guest policy, or both, and adding a person to your household without notifying the landlord violates at least one of them. Even if your lease is silent, a visitor who stays long enough will be treated as an occupant, and that shift can put your tenancy at risk.
What Your Lease Requires
Start with the document you signed. Three sections do the work.
The occupancy clause, sometimes labeled “Use of Premises,” states the maximum number of people allowed in the unit and often names every approved resident. Exceeding that limit is a straightforward lease violation, and many landlords tie the cap to local housing codes based on square footage and bedroom count.
The guest policy sets how long a visitor can stay before the landlord treats them as a resident. Many leases draw the line at 10 to 14 consecutive days. Once a guest passes that threshold, the lease typically requires written landlord approval or a formal addition to the agreement. If your lease uses a different number, that number controls.
Subletting and assignment clauses matter too. Adding a roommate isn’t technically subletting, which means transferring your interest in the unit to someone else. But these clauses often carry broader language prohibiting any unapproved person from residing in the unit, and that language covers a live-in partner or roommate just as effectively as a formal sublet.
Read all three sections before you decide what to do. If any of them require notice or approval, you are obligated to give it.
When a Guest Becomes an Occupant
If your lease doesn’t spell out a guest policy, landlords and courts look at behavior to decide whether someone has established residency. Several factors signal that shift:
- They spend most nights at the unit, stay for consecutive weeks, or no longer maintain another primary residence.
- They contribute financially by paying part of the rent, splitting utilities, or otherwise covering housing costs.
- They’ve moved in furniture, clothing, or a significant amount of personal belongings.
- They receive mail or packages at your address.
- They have their own key or access code.
No single factor decides the question, but when several overlap, most landlords and courts will conclude the person lives there. There’s a secondary risk worth knowing about: by collecting money from someone who isn’t on the lease, you may inadvertently create a landlord-tenant relationship between the two of you. If the arrangement sours, you could end up needing to formally evict your own guest.
What Happens If You Don’t Tell the Landlord
Hiding an occupant rarely lasts. Neighbors notice. Deliveries and vehicles give it away. Once the landlord documents the violation, the consequences move fast.
Eviction
The usual first step is a written notice demanding you cure the violation within a set number of days, either by having the person leave or by getting them added to the lease. These notice periods vary by jurisdiction but commonly run 10 to 30 days. If you don’t resolve it, the landlord can file an eviction lawsuit based on a material lease breach. An eviction on your record follows you for years and makes finding your next apartment significantly harder.
Personal Financial Liability
Because the unauthorized person isn’t on the lease, you carry sole responsibility for anything they do to the property. Damage they cause is billed to you. If they engage in illegal activity on the premises, you face the fallout. The landlord has no agreement with your guest and no reason to look anywhere but at the name on the lease.
Insurance Gaps
Renters insurance typically covers only the people named on the policy. If an unauthorized occupant’s belongings are stolen or destroyed in a fire, your policy likely won’t reimburse them. More significantly, if the person injures someone in the unit and a lawsuit follows, your liability coverage may not respond, because the person who caused the harm wasn’t a covered resident. People rarely think about this gap until the loss has already happened.
How to Add Someone to the Lease
The safe approach is to ask before the person moves in, not after. Send the request in writing — email or certified mail — so you have a record. Include the person’s full name, your unit address, and a short explanation. Note that they’re prepared to complete a rental application and consent to background and credit screening.
The landlord will typically run a screening that may cover credit history, rental history, income verification, and criminal background. Expect an application fee; the amount varies widely, with some states capping what landlords can charge and others setting no limit. Once the prospective occupant clears screening, the landlord drafts a lease addendum or a new lease for everyone to sign. That paperwork formally makes the new person a co-tenant, jointly responsible for rent and every other lease obligation.
Do not let the person move in until the paperwork is signed. This is the single most common mistake in the process and the hardest one to undo. Once someone is living in your unit without approval, you’ve already breached the lease, and every negotiation from that point happens on worse terms.
If the Landlord Says No
A landlord can deny your request, but only for legitimate, nondiscriminatory reasons. Common valid grounds include poor credit history, insufficient income, a recent eviction record, or a relevant criminal conviction. Applied consistently, these hold up.
What a landlord cannot do is deny the request based on a protected characteristic. The Fair Housing Act prohibits discrimination based on race, color, national origin, religion, sex, disability, and familial status.1Office of the Law Revision Counsel. 42 USC 3604 – Discrimination in the Sale or Rental of Housing If your landlord refuses your partner because they have children, or rejects a prospective roommate based on race or national origin, that’s illegal. You can file a complaint with HUD or your state’s fair housing agency. Many states and cities add protected classes beyond the federal list, such as sexual orientation or source of income.
Occupancy caps can also run into fair housing limits. HUD’s longstanding guidance treats two people per bedroom as generally reasonable, though the reasonableness of any policy depends on bedroom size, unit layout, and other property-specific factors.2U.S. Department of Housing and Urban Development. Fair Housing Enforcement Policy – Occupancy Standards A one-bedroom apartment generally should house at least two to three people, and policies that limit children specifically are more vulnerable to a discrimination challenge than those that cap total occupants.
If the denial is lawful but you disagree, your options narrow. You can ask the landlord to reconsider, offer a larger security deposit, or propose a shorter trial period. A landlord who has applied consistent, lawful screening criteria has the right to say no, and moving the person in anyway turns a disagreement into a lease violation.
Costs That Can Change When You Add Someone
Getting approval isn’t purely paperwork. Adding a co-tenant can shift the financial terms of your tenancy, and you should anticipate the changes before you ask.
Security Deposit
When you sign a new lease or addendum to add a co-tenant, the landlord can legally increase the security deposit. Most states cap total deposits at a multiple of monthly rent, commonly one to two months’ worth. If your existing deposit is already at the state maximum and the rent hasn’t changed, there may be no room to raise it. If the rent goes up at the same time, a higher cap may apply.
Rent
A landlord generally cannot raise rent mid-term unless the lease allows it. But signing a new agreement to add a co-tenant is a new contract, and the landlord can propose different terms, including higher rent. On a month-to-month arrangement, the landlord can raise rent with proper notice regardless. Having a second income earner on the lease can work in your favor during that conversation.
Joint and Several Liability
Most leases include a joint and several liability clause. It means every person on the lease is individually responsible for the entire rent, not just their share. If your roommate stops paying, the landlord doesn’t split the loss. The landlord comes to you for the full amount, and collecting from the roommate is your problem. That liability runs the full term of the lease. Consider carefully how much you trust the person’s finances before putting both names on the same contract.