If you’d like to make room for visiting friends and family without moving to a larger home, take notes from these accessory dwelling units (ADUs), lower-level guest spaces, and other inventive in-law units that treat Grandma right.

A Site-Conscious ADU in Austin

A Forest Sanctuary Designed to Support Autistic Triplets, Their Parents, and a Host of Caregivers

A Repurposed Horse Barn in Phoenix

A Charming, Spanish-Revival ADU With a Full Kitchen

A Tiny Guesthouse in an Australian Rainforest

A Skylit, Gabled ADU in Austin

A 3D-Printed Tiny Cabin

A Hillside Home in L.A. With a Lower-Level Guest Suite

A Budget-Friendly ADU in Portland (That Became Their Full-Time Home)

A Snug Guesthouse in Upstate New York

A Guesthouse That Hugs the Edges of its Oceanside Lot

A 300-Square-Foot Guesthouse With a Retro Fireplace

A Frank Lloyd Wright–Designed Guesthouse on a Private Island

Fifty miles north of New York City, a controversial home and guesthouse were built from Frank Lloyd Wright’s drawings on a private island. Intriguingly, the main home was completed in 1996 following Wright's original sketches for the 1950s owner of the island, who ultimately instead commissioned a 1,200-square-foot home on the island because of the high cost. Today, that 1,200-square-foot home serves as a three-bedroom guesthouse—the perfect space for extended family to stay." layout="wide" credit="via Douglas Elliman Real Estate" photoUserId=""/>