In 1720, the building was in such a poor state of repair that the minister, the Rev. Charles Campbell, thought it would possibly fall down. In September 1725, the Marquess of Lothian presented plans for a new church to Dalkeith Presbytery and the heritors (landowners). Edinburgh architect Mr Alexander McGill had drawn up these plans, and, although the project was approved, work did not commence on the new building, and on a clean site, until 1727. The design included making use of material from the old Church, where suitable, in the construction. In fact a considerable amount of stonework was transferred, to such an extent that all that remained of the old Church was the Crypt, which remained as the Burial Chamber for the Kerr/Lothian family. The completion year is generally accepted as 1729.