Sir John Gilmour of Craigmillar had also bought
Craigmillar Castle which he made his home while renting out Inch House. His successors, the
Gilmour baronets of Craigmillar, did the same. During the
Jacobite rising of 1745 Government forces were stationed in Inch House. A
west wing was added late in the 18th century. After the death of Sir Alexander Gilmour, 3rd Baronet in 1792, the house was modernised, and the Gilmour family lived there from 1796. Further modifications took place in 1813 and in 1834, including moving the main entrance to the south side of the building.
Sir Robert Gordon Gilmour (1857–1939) inherited the house and in 1889 married Lady Susan Lygon (1870–1962), and they planned a major series of internal and external alterations which took place between 1890 and 1892. They commissioned the leading historical architectural firm
MacGibbon and Ross, who had published a major historical survey of Scotland's towers and stately homes entitled
The Castellated and Domestic Architecture of Scotland from the twelfth to the eighteenth centuries, They were asked by the Gordon Gilmours to make the entrance to the house grander and more impressive and to make the house more comfortable for late 19th century living. MacGibbon and Ross achieved this while retaining much of the earlier historic character of the building. The modernisation and embellishment included enhancing the main entrance by creating an elaborate pilastered and pedimented porch, above which is inscribed the Gilmour family motto ‘
Nil Penna Sed Usus’ ('the practice not the penmanship'). This doorway led to a grand entrance hallway and staircase. A fire destroyed this staircase in 1979, and it was replaced with one in a similar style. There were also external and internal modifications made to the 18th century west wing. The internal modifications included enlarging ground floor and first floor rooms by removing internal walls, enlarging windows, creating west-facing bay windows and stripping the plasterwork in the ground floor room of the tower to make the original stonework a feature. Externally the west wing was made to look grander with the addition of angle turrets and dormer windows. There was further major expansion of the building at this time with the addition of a
north wing which resulted in the formation of an inner courtyard. The 1890 modifications also included building a chimney on the original tower building to vent a very large fireplace created in the ground floor. == 20th century ==