A Waterloo couple's labour of love has become the first mid-century modern heritage home in the region.

The house, on 222 Stanley Dr. in Waterloo's Westmount neighbourhood, is officially a heritage landmark after a vote by Waterloo council's finance and strategic planning committee Monday.

Built in 1956 and designed by Minnesota architect Carl Graffunder, the home is a "good representation of residential, mid-century modern architecture arising from the International Style," city staff wrote in a report.

The heritage designation means the owners of the property, Mary and R.J. Stadus, will have to first get the OK from council before it makes any changes to heritage features.

The building is "characteristically simple and elegant in its use of materials, design and form," staff said.

Key features include the spare front facade, the low roofline, elongated grey bricks, the cantilevered garage roof and the six metal poles supporting it.