1675 indicate that the current A428 to Dunchurch initially fell to the west of Upper Harlestone, skirting down past Althorp, leading to Kingsthorpe in Northampton. By 1738, the Northampton to Dunchurch turnpike had been established on the eastern side where the A428 now travels. In 1715, Thomas Andrew built Harlestone House, a grand neo-classical mansion on the edge of a lake, surrounded by heath parkland. In 1753, they also acquired the Bulmer Estate, which, when added to the sequestered lands of Sir Lewis Dyve, brought the majority of Harlestone under Andrew’s control. The enclosure of Harlestone occurred in 1766, with the main gainer being Robert Andrew. Many of the large farms in the area are enclosure farms, including Mill Farm, Glebe Farm and Fleetland Farm. Many of the other farms in the village remain from earlier strip farming, such as Rock Farm. Between 1809 and 1811, Robert Andrew employed the noted architects and landscape designers, Humphrey and John Adey Repton, to make alterations to Harlestone House. The house was demolished in 1940, but the Grade II* listed stables, the classically designed dam bridge and boathouse, and the paddocks still exist. In 1829, Robert Andrew sold the Harlestone Estate to Earl Spencer of Althorp. Many properties were built in the 19th century under the Althorp Estate, particularly worker’s cottages, like the sets of Ten Cottages in Upper and Lower Harlestone. A quarry face, possibly from this time, is still visible along Port Road, near to Park Farmhouse. The consistent architectural style pervades building of this time in Harlestone and the neighbouring villages. The Althorp Estate is still the major land owner in the village, and some properties may have possible applicable covenants. The 1834 foundation of the Union for Poor Law Administration saw Harlestone in the Brixworth Union, and the village workhouse was built, now forming several houses on Port Road, Upper Harlestone. Non-conformist religion was very popular in Northamptonshire, and land for the former Baptist Chapel in Upper Harlestone, now a dwelling, was granted by the Fifth Earl Spencer in 1873. In the 1870s, the Imperial Gazetteer of England and Wales described the parish as follows: "a parish in Brixworth district, Northamptonshire; 2½ miles WSW of Brampton railway station, and 4 NW of Northampton. It has a post-office under Northampton. Acres, 2,530. Real property, £4,314. Pop., 615. Houses, 138. The property is divided among a few. The manor belongs to