Adding a Roommate to Your Lease in Washington State

Thinking about adding a roommate in Washington? Before your friend moves in, it’s essential to understand the legal process for adding a roommate to your lease. Doing so the right way keeps you compliant with your rental agreement, helps avoid disputes, and protects your rights as a tenant.

Understanding the Lease and Getting Permission

Your first step is to review your lease agreement. In Washington, most leases require your landlord’s approval before you can add a new roommate—also known as a cotenant. Even if your agreement is silent, Washington state law generally gives landlords the right to approve or deny additional occupants, provided they do not discriminate based on protected characteristics.^[1]

• Always check your current lease terms.
• If unsure, contact your landlord or property manager in writing to request permission to add a roommate.

Landlord Approval: Legal Steps and Written Notice

Washington law does not require landlords to accept every request, but they must comply with the state’s anti-discrimination laws. Typically, your landlord may request to screen the new roommate (for credit, background, etc.) using standard application procedures.

• Submit a written request to your landlord, including your intended roommate's name and desired move-in date.
• Landlords may require the new roommate to fill out a rental application and sign a lease addendum or a new lease.
• Keep records of all written communication.

Relevant Form: Rental Application

• Form Name: Rental Application
• When Used: Your landlord may ask your roommate to complete this when requesting approval. For example, if your friend wants to move in, they fill out the official rental application your landlord provides. The landlord uses this to check eligibility.
• Source: Washington State Office of the Attorney General – Landlord Tenant Section

Relevant Form: Lease Addendum

• Form Name: Lease or Rental Agreement Addendum (no standard state-provided form; landlords typically provide their own)
• When Used: Once the landlord approves your request, they may require all roommates and current tenants to sign a revised lease or an addendum documenting the new arrangement.
• Source: Washington State Attorney General—Landlord Tenant Resources

Your Rights and Responsibilities

When a new roommate is officially added, both (or all) tenants share legal responsibility for the lease. This means:

• Everyone named on the lease is legally responsible for rent, damages, and following rental rules.
• If your roommate fails to pay, you may still owe the full rent.
• Make sure everyone signs any required documents and keeps copies.

If the Landlord Refuses Your Request

Landlords can deny your request based on reasonable screening criteria but not for discriminatory reasons. If you believe you’ve been denied unfairly, you may contact the Washington State Human Rights Commission for help with housing discrimination concerns.

Official Tribunal for Housing Disputes

In Washington, landlord-tenant disputes are generally handled by your local county district or superior court. There is no separate tenancy board. For more about the process, visit the Washington Courts—Landlord-Tenant Resources.

Relevant Legislation

Your rights and responsibilities are governed by the Washington Residential Landlord-Tenant Act (RCW 59.18). This law covers approvals, responsibilities, and eviction procedures for roommates.

Action Steps: How to Add a Roommate to Your Lease

• Review your lease for rules about additional occupants.
• Ask your landlord in writing for permission to add your roommate.
• Your potential roommate completes a rental application (if required).
• Landlord reviews and approves (or denies) the request.
• Everyone signs a lease addendum or updated lease.
• Retain copies of all communications and documents for your records.

Following these steps keeps your rental status secure and prevents misunderstandings.

Frequently Asked Questions

1. Can my landlord refuse my request to add a roommate?
   Yes, your landlord can refuse if the roommate does not pass standard screening or would violate occupancy limits, but not for discriminatory reasons under Washington law.
2. What happens if I add a roommate without landlord approval?
   Moving someone in without permission may violate your lease, risking notice or even eviction. Always follow the proper process and obtain written approval.
3. Does my new roommate have to sign the lease?
   Most landlords require new roommates to sign either a lease addendum or a new lease to make them officially responsible. Confirm with your landlord what is required.
4. Are there occupancy limits in Washington?
   Yes, typically based on local codes or landlord policy. Commonly, two people per bedroom is a standard guideline, but always check your lease and local laws.
5. If my roommate moves out, what should I do?
   Notify your landlord, update your lease, and clarify your responsibility for the full rent. If you want to add a new roommate, repeat the process above.

Conclusion: Key Takeaways

• Always check your lease before adding a roommate and get the landlord’s written approval.
• Use official forms (rental application or lease addendum) and keep records for protection.
• If you have issues, reach out for support—resources are available to Washington renters.

Adding a roommate can be simple with the right steps and open communication. Protect your rights and keep your tenancy secure by following all legal requirements.

Need Help? Resources for Renters

• Washington State Attorney General – Landlord Tenant Section
• Washington Residential Landlord-Tenant Act (RCW 59.18)
• Washington Courts – Landlord-Tenant Process
• Washington State Human Rights Commission (Discrimination Complaints)

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1. Washington Residential Landlord-Tenant Act (RCW 59.18)

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