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.

Cosgriff House by Christopher Polly Architect in architecture  Category

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.

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

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

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

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

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

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

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Skylights fill the stairwell and upper hallway with light.

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

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

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Cosgriff House by Christopher Polly Architect in architecture  Category

Photos by Brett Boardman Photography.