The Thomas House was built in 1850 for Edward Thomas. Thomas was a farmer and by 1877 the house is shown in the Halton County Atlas with an orchard.
The house was designated in 1993 as an exceptional example of an early Gothic Revival farmhouse. It is constructed of local stone that gives it a uniform and elegant look. The rubblestone walls are said to be 18 inches thick (LACAC n.d.). As with farmhouses of this era, the materials for the house likely came from the property or close by. Stones were cut and arranged to create an appealing colour scheme with quoining on the building’s corners as well a stone sills and projecting hoodmold. The central entrance also features a decorative hood mold that is likely carved stone. The stone of the Niagara Escarpment (dolostone, sandstone and limestone) that runs through the Township initially made farming difficult. Later, the stone was viewed as a resource instead of a nuisance and used extensively throughout the Township in the construction of farm houses and as the foundation of many barns and outbuildings.
Typical of the Gothic Revival style, the façade of 4065 Guelph Line is symmetrical and features a central gable with an arched window and decorative woodwork. The Thomas House has a 1908 date stone that was likely added during renovations that show up on assessment records (LACAC n.d.).