A room rental agreement in Washington State is a written contract between the person who controls a home and someone paying to live in a room inside it, and it falls under the state’s Residential Landlord-Tenant Act at RCW 59.18.1Washington State Legislature. Washington Code RCW 59.18 – Residential Landlord-Tenant Act That means the agreement has to do more than describe the room and the rent. It has to carry the specific terms, disclosures, and procedures the statute requires, and the landlord has to deliver a fully executed copy to the tenant within fourteen days of signing.2Washington State Legislature. Washington Code RCW 59.18.065 – Landlord Duty to Provide Notice of Rental Agreement, Safety Features, and Tenant Rights
A room renter has the same core protections as someone leasing a whole apartment: a habitable space, exclusive possession of the rented room, and proper notice before entry. Clauses purporting to waive those rights are unenforceable.
What the Written Agreement Must Spell Out
Start with identification. Both parties’ full legal names, the street address, and a specific description of which room is being rented, along with any storage or parking that comes with it. “The upstairs bedroom” is not specific when the house has three.
Then the money terms. Vague financial language is where most room-rental disputes start, so write them out:
- The exact monthly rent and the day it is due.
- Late fees. Washington bars a late fee until rent is more than five days past due. There is no statewide cap on the amount, but the agreement should state the specific charge.
- Utilities. Say whether they are included or split, and if split, the method. Shared-housing agreements often divide costs by the share of square footage each person occupies, or build a flat utility charge into the rent.
- The security deposit amount, which must match the figure on the required move-in checklist.
Then the shared-living terms. House rules for the kitchen, bathroom, and laundry. Guest policies, quiet hours, smoking, cleaning. These feel awkward to negotiate on day one and much worse to argue about on day ninety. State whether the tenancy is month-to-month or for a fixed term, because the rules for ending each differ.
If you prefer not to draft from scratch, standardized templates are available through the Washington LawHelp portal and local housing authority websites.
Disclosures You Have to Hand Over
Washington requires landlords to give the tenant several written disclosures at or before signing. These are not optional add-ons.
Mold
Information from the Washington Department of Health on the health risks of indoor mold and how to control growth. It can be delivered individually in writing or posted in a visible common area.3Washington State Legislature. Washington Code RCW 59.18.060 – Landlord Duties
Smoke Detectors and Fire Safety
A written notice that the unit has a smoke detection device and that the tenant is responsible for keeping it working. Multifamily buildings require a longer disclosure covering alarm type, sprinklers, smoking policy, and evacuation plans; a single-family home only needs the basic smoke-detector notice.3Washington State Legislature. Washington Code RCW 59.18.060 – Landlord Duties
Lead-Based Paint
For any home built before 1978, federal law requires disclosure of known lead-based paint hazards, delivery of any available records, and a copy of the EPA pamphlet “Protect Your Family From Lead in Your Home.” A lead warning statement must be included in or attached to the lease.4United States Environmental Protection Agency. Lead-Based Paint Disclosure Rule, Section 1018 of Title X
Local Rules
Some Washington cities, including Seattle, require landlords to provide a summary of local landlord-tenant laws alongside the agreement. Check your city before finalizing the lease; local rules sometimes go further than state law.
Security Deposit Rules
Washington’s deposit rules are strict, and landlords who skip steps often end up owing more than the deposit itself.
The Move-In Checklist Comes First
A landlord cannot collect any deposit unless the rental agreement is in writing and the landlord provides a written checklist describing the condition of the premises at the start of the tenancy. Both parties sign and date it, and the tenant gets a copy.5Washington State Legislature. Washington Code RCW 59.18.260 – Moneys Paid as Deposit or Security for Performance by Tenant For a room rental, document the room itself plus any shared areas named in the agreement. Take photos and attach them. If the landlord refuses to do a walk-through, fill out the checklist yourself, sign and date it, send the original to the landlord, and keep a copy.
Where the Money Sits
The deposit must be held in a trust account at a financial institution in Washington State. The landlord has to give the tenant written notice of the institution’s name and address. Failing to hold or disclose the funds properly can leave the landlord on the hook for returning the full deposit regardless of damage.
The 30-Day Return Deadline
Once the tenant has vacated, the landlord has 30 days to either return the full deposit or deliver a specific written statement showing what was deducted and why, with copies of estimates, invoices, or receipts. If the landlord or their employee did the repair work, the documentation has to list materials used, hourly rate, and time spent.6Washington State Legislature. Washington Code RCW 59.18.280 – Moneys Paid as Deposit or Security for Performance by Tenant – Deposit Return
A landlord who misses the 30-day window forfeits the right to keep any portion of the deposit and owes the tenant the full amount. A court can award up to twice the deposit if the landlord intentionally refused to send the statement or refund, and the prevailing party in a deposit dispute recovers attorney fees and court costs.7Washington State Legislature. Washington Code RCW 59.18 – Residential Landlord-Tenant Act, Full Chapter – Section: RCW 59.18.280
Ending the Tenancy
If the Tenant Wants to Leave
A tenant on a month-to-month room rental ends the tenancy by giving at least 20 days’ written notice before the end of a rental period.8Washington State Legislature. Washington Code 59.18.200 – Tenancy From Month to Month Rent due on the first means notice has to be delivered at least 20 days before the next first. A fixed-term lease runs to its end date unless the agreement says otherwise.
If the Landlord Wants the Tenant Out
Washington requires just cause. The landlord cannot simply decide they want the room back. The grounds most relevant to room rentals include:
- Nonpayment of rent, after a written pay-or-vacate notice goes unanswered.
- Substantial breach of a material lease term, after at least 10 days’ written notice to cure.
- Nuisance or illegal activity, after at least three days’ written notice.
- Owner or immediate family moving in as a primary residence, with at least 90 days’ written notice.
- Sale of a single-family home, with at least 90 days’ written notice.9Washington State Legislature. Washington Code RCW 59.18.650 – Eviction of Tenant, Refusal to Continue Tenancy, End of Periodic Tenancy
No Lockouts, No Utility Shutoffs
A landlord who wants a room renter out has to go through the court system. Changing the locks, removing belongings, or cutting off utilities to pressure someone to leave are illegal. Lockouts without a court order violate RCW 59.18.290, and intentional utility shutoffs violate RCW 59.18.300. This matters in room-rental situations because the landlord often lives in the same house and may feel entitled to handle the problem personally. They are not.
Fair Housing When You’re Renting Out a Room
The federal Fair Housing Act prohibits housing discrimination based on race, color, religion, sex, disability, familial status, and national origin.10Office of the Law Revision Counsel. 42 USC 3604 – Discrimination in the Sale or Rental of Housing A limited exemption, sometimes called the “Mrs. Murphy exemption,” applies to owner-occupied buildings with four or fewer rental units. If you live in the home and rent out a room, you may have more latitude in choosing a tenant.11Office of the Law Revision Counsel. 42 USC 3603 – Effective Dates of Certain Prohibitions
The exemption does not reach advertising. Even when you qualify for Mrs. Murphy in choosing a roommate, your listing cannot express preferences based on protected characteristics. “No children,” “Christians preferred,” or “seeking Indian female” all violate the advertising prohibition regardless of your living situation. The one recognized exception: someone sharing a bathroom or kitchen may advertise for a roommate of the same sex for privacy reasons.
Disability has its own stricter rules. Refusing to accommodate a trained service animal would still violate the Fair Housing Act even under the Mrs. Murphy exemption. HUD issued an enforcement memorandum in May 2026 adopting the ADA’s definition of a service animal for fair housing complaints, so HUD will pursue cases involving animals individually trained to perform disability-related tasks. The Fair Housing Act itself has not changed, and a tenant denied a reasonable accommodation for an assistance animal can still bring a private lawsuit in federal or state court. Washington law may provide broader protections independently.
Rental Income on Your Taxes
Every dollar of rent you collect from the room is taxable income, reported on Schedule E (Form 1040).12Internal Revenue Service. Topic No. 414, Rental Income and Expenses You can deduct a proportional share of mortgage interest, property taxes, insurance, utilities, and repairs, and you can claim depreciation on the rented portion using Form 4562. The IRS has special rules for renting part of a home you also live in, laid out in IRS Topic 415; in practice you figure the rented room’s share of the home’s square footage and apply that percentage to shared expenses.
Keep records of every payment received and every expense claimed. A security deposit you return in full is not taxable income. Any portion you keep for damages becomes taxable in the year you keep it.