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Cosgriff House by Christopher Polly Architect
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Keeping the original shell of the home, the Cosgriff House was given an environmental and economic renovation and extension designed by architect Christopher Polly. A ground floor living area was inserted beneath the original living space and an extension was added on in the rear that opens up towards the garden.

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Located in Annandale, Sydney, Australia, the modestly-sized house expands with the two-story extension that features a uniquely-shaped roof form that allows light to flood both floors.

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The lower floor completely opens up to the backyard with sliding glass doors that dissolve the boundaries between indoors and out.

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White walls and ceilings and polished concrete floors unify the long, narrow space.

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Blinds can be lowered for privacy on both floors of the extension.

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Skylights fill the stairwell and upper hallway with light.

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The upper floor renovation adds a new main bedroom, bathroom, and an adaptable bedroom that can work as a study in the future.

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Photos by Brett Boardman Photography.

Caroline Williamson is Editorial Director of Design Milk. She has a BFA in photography from SCAD and can usually be found searching for vintage wares, doing New York Times crossword puzzles in pen, or reworking playlists on Spotify.