A large house has stood on the site since the seventeenth century, and from 1800 to 1810 it was owned by the architect John Soane, and he rebuilt various aspects to his own designs between 1800 and 1804.
By 1900, it had been acquired by Ealing Council, originally as a Free Public Library, which remained largely until 1984, when it moved out and restoration work began. It wasn't opened again until early 1987, when it became the London Borough of Ealing's museum, known as the PM Gallery & House.
Today, it is open in summer on Tuesday - Friday from 1pm - 5pm and Saturdays from 11am - 5pm. Entry is free. For more, see here.