Myrle (now spelt Merley) was an ancient manor in the tithing of Great Canford, situated a mile south of Wimborne, and belonging to the ancient Lords of Canford. In 1712 , then spelt Merly, the estate was sold by Harry Constantine to Windham Ash, who in 1751 sold it to Ralph Willett.

In 1752 Willet started building the now current Merley House, much grander than it's predecessor. He designed the house himself, consisting of three storeys and cellars with walls of brick, rendered on three sides with the centre of the north side in Portland stone. This front has three balconies and four Ionic pilasters supporting an entablature with pulvinated frieze and a pediment. The house was completed in 1760.

As happened to so many historic houses, at the outbreak of war in 1939 the estate was requisitioned by the War Office and a large camp was built in the grounds, the house being used by the offices. In 1942 the house changed hands once again, being bought by the 2nd Viscount Wimborne, but he never lived there as the Army did not leave until 1946 and the house was then sold again at auction.

The house was then converted to flats and little repair work was carried out. A caravan park was started in 1960 to the south east of the house with the idea that the income would help the house.

The present owners bought the house and caravan park and set about upgrading the park to further increase the income and fund the re-development of the house.

In 1998 the ground floor was closed to the public and for two years stood empty. In June 2000, Professional Computer Group Ltd moved in and the gracious, high-ceilinged rooms now house the staff of PCGL as well as being utilised for the legal seminars and training sessions.

Recently, PCGL expanded to the first floor of Merley House and restored the front central room to its former glory. From this Conference Room, one has a panoramic view of Wimborne and the Wimborne Minster.