Thurlow House is of state significance as a finely designed and well-executed example of Modernist residential architecture. It is one of the finest and most intact houses that survives from the first half of the 1950s in NSW. The house demonstrates advanced planning and split level configuration, and demonstrates convincingly and well the characteristics of the Modern Movement residential architecture. The aesthetic value of the house is due in part to the exploitation of its structural system to provide dramatic spatial qualities and architectural form. It also provides evidence of advanced residential technology and amenity from this period, such as fluorescent and other lighting, kitchen design and surviving joinery, built in joinery items including the cabinet in the living room, which accommodated stereo equipment, and early passive sun control devices.
