Tenant Screening

Can landlords require co-signers for rental approval?

Washington rental guidance and tenant-landlord operational information.
Published April 5, 2026 State-specific rental guidance Update This Question
Reviewed by Tenants & Landlords Editorial Team

This rental guidance was reviewed by the Tenants & Landlords Intelligence Team, specializing in lease agreements, notices, rent disputes, deposits, evictions, and tenant-landlord operational procedures.

Asked 59 days ago · Washington

Can Landlords in Washington Require Co-Signers for Rental Approval?

In Washington State, landlords have broad discretion in establishing tenant screening criteria to help ensure reliable tenancy and timely rent payments. Requiring a co-signer (also referred to as a guarantor) is a common practice when a prospective tenant’s financial profile raises concerns. This guide explains key points landlords should consider when necessitating co-signers for rental approval under Washington landlord-tenant law.


Understanding the Role of a Co-Signer

A co-signer typically agrees to be legally responsible for rent payments and other lease obligations if the primary tenant fails to comply. This effectively reduces the landlord’s risk by adding a financially dependable party capable of covering rent or damages.


Can Washington Landlords Require a Co-Signer?

Yes, landlords in Washington may require a co-signer as a condition of rental approval, provided certain requirements and legal considerations are met.

Reasons for Requiring a Co-Signer

Landlords often ask for a co-signer when a tenant:

  • Has a limited or poor credit history.
  • Insufficient income or unstable employment.
  • Lack of an established rental history.
  • Past evictions or lease violations.
  • Is a student or young adult without a steady income.

Important Legal Considerations

When requiring a co-signer in Washington, landlords should be aware of the following:

  • Non-Discrimination: Landlords cannot use co-signer requirements to discriminate based on protected classes such as race, color, national origin, religion, sex, familial status, disability, sexual orientation, or other federally and state-protected categories under the Washington Law Against Discrimination (WLAD).
  • Consistent Application: Screening policies should be applied evenly to all applicants to avoid claims of unfair treatment. If co-signers are required only for certain applicants, the rationale must be consistent with legitimate business reasons.
  • Written Agreement: The co-signer must sign a guaranty agreement clearly outlining their obligations. This agreement is legally enforceable and should specify that the co-signer is jointly and severally liable for rent, damages, and any other tenant obligations under the lease.
  • Screening the Co-Signer: Landlords are entitled to screen co-signers regarding creditworthiness and background to assess their ability to fulfill the financial guarantee.
  • Disclosure Requirements: The landlord must disclose all screening criteria, including co-signer requirements, upfront in advertising or during the application process to comply with Washington’s Rental Housing Opportunity Act and avoid claims of undisclosed conditions.

Practical Steps for Washington Landlords When Using Co-Signers

  1. Establish Clear Criteria:
- Define circumstances when co-signers are required. - State income thresholds, credit score minimums, or other relevant factors.
  1. Inform Applicants Early:
- Include co-signer requirements in rental listings, application forms, or tenant information packets. - Ensure applicants understand the process and legal obligations.
  1. Screen the Co-Signer Thoroughly:
- Request financial documentation (pay stubs, tax returns). - Perform credit and background checks with proper authorization. - Confirm identity and residency to avoid fraudulent guarantees.
  1. Prepare a Written Guaranty:
- Draft a separate co-signer agreement or include guarantor language in the lease. - Secure signatures before lease execution. - Review legal language to ensure enforceability and compliance.
  1. Maintain Documentation:
- Keep copies of the co-signer agreement, screening reports, and any correspondence. - Document reasons for requiring a co-signer as part of the tenant selection process.

Potential Risks and Considerations

  • Enforcement Challenges: While co-signer agreements are legally binding, pursuing a guarantor for unpaid rent or damages may require additional legal action such as filing a claim in small claims court.
  • Privacy Compliance: When collecting sensitive financial information from co-signers, landlords must follow applicable privacy and data protection laws.
  • Fair Housing Compliance: Always review policies regularly to ensure they comply with evolving fair housing standards and state laws.

Summary

In Washington, landlords can require co-signers for rental approval as a protective measure against financial risk. This practice is lawful if applied fairly, conscientiously, and documented thoroughly. Incorporating clear guidelines and transparent communication during tenant screening helps reduce misunderstandings and potential legal issues.

Landlords should couple a co-signer requirement with comprehensive tenant screening, including background and credit checks, to make informed leasing decisions while maintaining compliance with Washington landlord-tenant and fair housing laws.

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