Sydney-based architect Melonie Bayl-Smith of Bijl Architecture takes us inside her best work and deconstructs one of her favourite projects.

Her pick is a Federation-style duplex that sits within a Heritage Conservation area of Kirribilli.

Kirribilli is an affluent suburb of Sydney.

It's best known as the suburb where the Australian Prime Minister's official Sydney residence is located.

But as you're about to discover, doing anything that changes the built environment in a suburb that's full of high-value, heritage-conservation assets, is no walk in the park.

Full project details, including a word-for-word transcript, key products used, photo gallery, and plans elevations, and sections are at Builtworks.com.au