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The house was built between 1870 and 1875, on the site of an earlier medieval moated site (now a Scheduled Ancient Monument). The house features a number of subsqeuent alterations.

The gardens were designed soon after by Thomas Mawson, and were completed in 1898. Features included terraces, lawns, banks, tennis court, yew hedges, walls, and borders, as well as some woodland planting.

Site timeline

1920 to 1929: Major and Mrs William Dickins Heywood extended the house with a large bay and window on the Drawing Room and another similar bay to the end of the Dining Room.

People associated with this site

Builder: Messrs Baker

Designer: Thomas Hayton Mawson (born 05/05/1861 died 14/11/1933)



rose garden

The beds in the rose gardens were once separated by box hedges. Some areas were later paved.

tennis lawn


Feature created: After 1917

Major and Mrs William Dickins Heywood put various statues
around the garden.

well head

This feature no longer remains at Little Onn, though it is illustrated in some of the photographs linked to this record. It is an old well head with a wrought iron top. This was taken away to the garden at Tixall on the death of Mrs W D Heywood in 1971.


The rustic summerhouse is commonly attributed to Mawson. It was actually brought by Mr and Mrs William Dickins Heywood from their previous house, Letton Lodge, in Broughton Park, Manchester in 1917.


Feature created: After 1917

Major and Mrs William Dickins Heywood created the 'Dog Bone' shaped pond at Little Onn (with its octagonal ends).