In the later 20th century the house was used as offices, first by Cumbernauld Development Corporation, then North Lanarkshire Council, and latterly by DH Morris, who went into liquidation in March 2007.

William Adam was the foremost architect in Scotland during the first half of the 18th century, and Cumbernauld House is a particularly good example of his work.

Rather than stay in Cumbernauld House, the commander, Lord George Murray, slept in the village's Black Bull Inn, where he could enforce closer discipline on his soldiers.

The last Lord Fleming, Charles, 7th Earl of Wigtown, died childless in 1747, and the estates passed to the Elphinstone family.

Cornwallis was killed in action fighting the Boers as a Captain of the Grenadier Guards at Majuba Hill, Transvaal, in 1881.

[8] Groome's Gazetteer has "Cumbernauld House, standing amid an extensive park, ¼ mile ESE of the town, superseded an ancient castle, which, with its barony, passed about 1306 from the Comyns to Sir Robert Fleming, whose grandson, Sir Malcolm, was lord of both Biggar and Cumbernauld; it is now a seat of John William Burns, Esq.

Other mansions are Dullatur House, Nether Croy, and Greenfaulds; and 4 proprietors hold each an annual value of £500 and upwards, 16 of between £100 and £500,12 of from £50 to £100, and 35 of from £20 to £50.

Three public schools- Cumbernauld, Condorrat, and Arns-and Drumglass Church school, with respective accommodation for 350, 229,50, and 195 children, had (1880) an average attendance of 225,98,30, and 171, and grants of £230, 6s.

Cumbernauld HIT, a CDC sponsored comedy film from 1977, features the exterior and interior of the house.

Cumbernauld House is not part of a historical conservation area running from the listed kirk and manse at Baronhill, through the Village conservation area with its Lang Riggs, to the site of Cumbernauld Castle and beyond that to the Comyn Motte and adjacent lime kilns.

The whole represents the classic 'herringbone' layout of the mediaeval Scottish burgh with its principal street running from the castle to the church, along the summit of a ridge, with long narrow gardens (the Lang Riggs) stretching out behind.