Accessory Dwelling Units and Short Term Rentals

An accessory dwelling unit, such as a garden flat, a converted garage or a backyard studio, may be rentable short term, but it often faces extra conditions beyond those for a main house. The direct answer depends on whether the unit itself was lawfully created, whether its permission allows separate letting, and whether short term use is permitted for accessory units in that zone. A unit that is lawful as a family annexe is not automatically lawful as a short term let.

Accessory units attract attention because they increase housing density on one parcel, and cities regulate them to protect parking, privacy and infrastructure. A host who lists an accessory unit without checking its specific permission risks enforcement against the unit itself, which can be harder to resolve than enforcement against a main house listing.

Accessory units may be created under a general permission, a specific planning permission, a building permit or a combination, depending on the jurisdiction. Each route leaves a paper trail: drawings, conditions and sometimes a restriction that the unit must remain ancillary to the main house or occupied by a family member. That paper trail governs later use, and a unit created as an annexe for relatives may carry a condition that prevents separate commercial letting.

Unpermitted conversions are a particular risk. A garage converted without permission may lack the safety, insulation and escape standards required for sleeping accommodation, and listing it short term compounds a building breach with a rental breach. Hosts should establish the unit's lawful status before furnishing it for guests, because rectifying an unpermitted unit can be costly and may not be possible at all.

Conditions at code structure level include size limits, setback and height rules, parking provision, separate or shared services, and owner occupancy of the main house. Some codes require the owner to live on the parcel while an accessory unit is rented, which prevents an investor from renting both the main house and the accessory unit short term from elsewhere. Other codes cap the number of accessory units per parcel or require a minimum lot size.

Short term specific conditions may add a night limit, a guest limit or a requirement that the accessory unit be registered separately from the main house. Separate registration matters because a licence for the main house does not automatically cover the accessory unit, and platforms may need a separate listing with its own number. Hosts should check whether each unit needs its own permission, licence and tax account.

Accessory units share or duplicate services with the main house: water, drainage, electricity, waste collection and access. A short term accessory unit increases turnover through a shared driveway or garden path, which neighbours experience directly, and parking pressure can become the main source of complaints even when the rental itself is lawful. Management arrangements such as a separate bin, a parking space and a clear access route reduce friction and demonstrate good faith.

Privacy is another neighbour effect, because a backyard unit overlooks gardens that were previously private. Codes address this through window placement, screening and setback rules, and a host who ignores those rules invites complaints that can trigger a broader review of the unit's permission. Respecting the physical conditions of the permission is part of rental compliance, not an optional courtesy.

Hosts sometimes rent the main house and the accessory unit as one listing, sometimes as two, and sometimes rent one while living in the other. Each pattern has a different regulatory reading: a combined listing may be treated as one dwelling with extra bedrooms, while separate listings may be treated as two dwellings with two licences. The pattern chosen must match the permissions held, and changing the pattern later may need a fresh permission or licence.

Tax and insurance treatment can also differ by pattern, with separate units sometimes treated as separate rental activities. Hosts should keep the pattern consistent across the platform listing, the licence, the insurance schedule and the tax records, because inconsistency across those documents creates questions in any investigation. Consistency is a simple discipline that prevents many disputes.

Check the unit's creation permission and conditions, the zone rules for accessory units, any short term specific provisions, and whether separate registration is required. Record dates and sources, and confirm safety compliance for sleeping accommodation before listing.

This guide is general information only, not legal advice for any parcel. Accessory unit rules vary widely, and one city's approach must never be treated as a general rule. Before acting, verify the position with the official municipal code or registration portal for that address.