Tenants in Washington must obtain explicit written consent from their landlord before subleasing a rental property. Search short term and month to month rentals.A Washington sublease agreement is a contract used when a tenant wants to rent part or all of their residence to another person. Here is a sample sublease agreement you can fill out or use as a template. Create your Washington sublease agreement and sublet your rental. Rent your unit to a subtenant with our attorney-approved template. If your tenant is trying to rent out the house themselves, it's probably a good idea to let them know about Fair Housing rules.