Grand Designs: Unbelievable Builds

Lori and Maugan are building a unique, modern home in one of the most historic suburbs in Melbourne, Australia. The house features quirky elements, including a trapeze net, underground car-parking stacker and a 10-foot paper plane garden structure.

A teacher and mechanical engineer with a passion for making things is building a unique, underground home in Australia. The house will be thermally efficient, not requiring heat or air conditioning, and will feature a rooftop garden.

In Mount Tamborine, Australia, a couple builds a home-away-from-home on lush mountain acreage. They combine modern and traditional architecture to build a hybrid home with equal indoor and outdoor space.

In Euroa, Australia, Eddie and Dot are building a dream home with a 360-degree view of their stunning property. Eddie is set on building the massive house himself, but he quickly realizes the big undertaking is more complicated than he planned.

In Tiger Head Bay, Australia, a writer builds a home that's small in square footage but big on exquisite creativity. From the carved timber outdoor tub to the one-of-a-kind artisan fireplace, every part of the design showcases the locale.

Steve had existing plans for a James Bond-style home dangling over a cliff, so he couldn't help himself when he found a steep lot on the coast of Sydney, Australia. He sets out to build the home, but the intense project tests his abilities and budget.

On the coast of Sydney, Craig has a system that might revolutionize how homes are built, and he wants to test it on the massive house he is planning with his wife, Barabara. With endless complications, the build tests his faith, abilities and health.

A couple builds a midcentury modern home that explores the minimalist aesthetic in Byron Bay, Australia. However, they could face challenges when their design interests don't match their budget for building on the edge of a rainforest.

Tony and Tania are building a home in Adelaide, Australia, but their expensive taste doesn't match their budget. As months turn into years, they must decide how to finish the project before costs balloon out of control.

In the Australian rainforest, a couple is building their dream home: a two-story farmhouse inspired by the 15th-century saltbox homes of New England. He installs an extensive solar panel system and does everything possible to protect them from bushfires.