A casita is one of the most underinsured structures in Arizona. It’s the guest house, the mother-in-law suite, the pool house, the detached office. And it’s the exact type of building where a standard homeowners policy might cover only a fraction of the actual rebuild cost — or nothing at all if it’s being rented out. Here’s what Arizona homeowners with a casita on the property actually need to know.

Own a business? See our business insurance in Arizona page for BOP and commercial liability coverage.

What counts as a casita under a homeowners policy?

Under a standard HO-3 policy, a casita is treated as an “other structure” — a detached building on your property (not sharing a wall with the main house). Common examples in Arizona:

  • Detached guest houses (500-1,500 sq ft, kitchenette, bathroom)
  • Pool houses with a full bathroom + kitchenette
  • Detached garages converted to living space
  • Studio casitas used as home offices, art studios, or short-term rentals
  • Mother-in-law suites separated from the main house

The default “other structures” limit — and why it’s usually not enough

Most Arizona HO-3 policies default “other structures” coverage at 10% of dwelling coverage. If your home is insured for $500K dwelling, that’s $50K for the casita AND any other detached structure (garage, workshop, shed, gazebo) combined. In Scottsdale and Paradise Valley, that math breaks fast:

  • Rebuild cost of a 1,000 sq ft Scottsdale casita in 2026: roughly $250K-$350K
  • Default HO-3 coverage: $50K
  • Coverage gap: $200K-$300K

When you need a separate casita endorsement

You need a scheduled casita endorsement (bumping the other structures limit specifically for the casita) if any of these apply:

  • The casita’s rebuild cost is more than 10% of your dwelling coverage
  • The casita has plumbing, HVAC, and a kitchen (higher rebuild cost per square foot)
  • You store expensive equipment or art in it
  • You have both a casita AND a detached garage — they compete for the same 10%

Renting the casita — what changes

The moment you rent your casita (long-term tenant, Airbnb, or a family member paying rent), your HO-3 business-use exclusion likely kicks in. You need either:

  • A short-term rental endorsement on your existing policy — for Airbnb / Vrbo use
  • A landlord (DP-3) policy layered on top — for long-term rentals
  • Increased liability limits — a tenant or paying guest is a much bigger liability exposure than a friend visiting

Casita liability — a specific Arizona risk

Arizona casitas often have their own pool, hot tub, or outdoor kitchen. Guest injuries in these areas are the #1 liability claim we see. Umbrella coverage ($1M-$5M) on top of your homeowners is cheap ($250-500/year) relative to the potential exposure, especially if the casita is rented or hosts guests regularly.

Get a casita insurance quote in Arizona

We write casita coverage — endorsements, standalone landlord policies, umbrella — for Scottsdale, Phoenix, Cave Creek, Paradise Valley, and every AZ address with a detached structure. Get a real quote in 10 minutes: (480) 998-6900 or check our auto and home insurance page.

Related reading: