42 Cowles Road is a heritage-listed historic residence located in the Sydney suburb of Mosman, New South Wales, Australia. The house is also known as Shadwell. It was added to the New South Wales State Heritage Register on 2 April 1999.

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Located behind high hedges and picket fences, this unique, light-filled family home with traditional corrugated iron roofing, bull-nosed return verandah and iron-lace embellishments. Perfectly private, surrounded by country-cottage plantings of roses and gardenias, creating a serene and appealing setting. The house is unspoilt, retaining its history and meticulously presented with wide entry, high ceilings, original polished floors and fireplaces.

42 Cowles Road, Mosman was listed on the New South Wales State Heritage Register on 2 April 1999.

• Australian residential architectural styles

This Wikipedia article was originally based on Building, entry number 00430 in the New South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 under CC-BY 4.0 licence, accessed on 1 June 2018.