The congregation has worshipped according to a Unitarian version of the Book of Common Prayer since 1785, currently in its ninth edition.

[citation needed] In 1749, construction began on the current stone structure, which was designed by Peter Harrison and completed in 1754.

The wood was then shipped to Lunenburg, Nova Scotia, where it was used to construct St. John's Anglican Church.

The Loyalist families left for Nova Scotia and England, and those who remained reopened the church in 1782.

Although Freeman still considered King's Chapel to be Episcopalian, the Episcopal Church's first bishop Samuel Seabury refused to ordain him.

[5] It is a member congregation of the Unitarian Universalist Association.Inside, the church is characterized by wooden columns with Corinthian capitals that were hand-carved by William Burbeck and his apprentices in 1758.

Additional seating was provided in balconies on either side of the nave, level with the organ loft and choir benches.

[citation needed] Music has long been an important part of King's Chapel, which acquired its first organ in 1713, bequeathed to the congregation by Puritan minister Thomas Brattle.

[7] For forty-two years starting in 1958,[8] the eminent American composer Daniel Pinkham was the organist and music director at King's Chapel.

Samuel Vassall of London was also named a member of the Company in its 1629 royal charter but never sailed for New England, instead remaining in London to tend to business affairs; his brother William frequently clashed with John Winthrop, and eventually removed himself to Scituate, Massachusetts.