[5] The company was established by a former joiner, John Muir, in 1973,[6][7] following his departure as managing director of Scothomes, part of Scottish Homes.

[5] During late 2017, it was announced that Muir Group planned to build up to 75 per cent more new homes each year in a bid to ensure the availability of adequate affordable housing.

[15] In the early 2020s, Muir Group announced that it would be building a greater proportion of bungalows in some of its housing schemes in response to demographic changes.

[18] That sane year, Muir Group completed a stock transfer with Manchester Jewish Housing Association to expand its independent living provision.

[19] By 2023, Muir Group comprised six subsidiaries, including construction, homes, timber systems, property development, and property investment arms, as well as owning and operating Deer Park Golf and Country Club in Livingston;[20] by this point, the company had developed £1.5 billion's worth of commercial buildings across the UK and had built in excess of 4,000 homes across Scotland.