Pan Abode Homes is a prominent company selling ADU’s (Accessory Dwelling Units), DDU’s ( Detached Accessory Dwelling Unit) buildings for traditional single family residential lots.

Continue living in your home and let the ADU / DDU rental generate steady monthly income.
Listing it with Airbnb is a good option to monetize your property.

Many states have promulgated middle housing ordinance to promote ADU’s.
At least 15 states have enacted significant zoning preemption laws that override local municipal restrictions to allow denser housing in areas previously reserved exclusively for single-family homes.
Washington State: Enacted sweeping "middle housing" legislation requiring larger municipalities to allow duplexes, triplexes, or fourplexes on any lot traditionally zoned for single-family homes.
Under Washington State’s House Bill 1337 (codified under RCW 36.70A.680), cities and counties fully planning under the Growth Management Act (GMA) must allow up to two ADUs (Attached or Detached) on any single-family residential lot within an Urban Growth Area (UGA).

Key State Regulations
State law sets baseline standards that local municipalities must follow. These prevent cities from heavily restricting the creation of Accessory Dwelling Units (ADUs) or Detached Accessory Dwelling Units (DADUs):
• Unit Count: Municipalities must allow at least two ADUs per lot (either attached, detached, or a mix) in addition to the principal home.
• Size: Local governments cannot force ADUs to be smaller than 1,000 square feet.
• Owner-Occupancy: State law prohibits jurisdictions from requiring the property owner to live on-site in either the principal unit or the ADUs (unless the property is used as a short-term rental).
• Parking: Parking requirements are strictly limited. No on-site parking can be required for ADUs located within a 0.5-mile radius of a major transit stop