The Wealth of Nations by Part 5 Chapter 2 Page 91

The next tax of this kind was a tax of two shillings upon every dwelling-house inhabited. A house with ten windows to pay four shillings more. A house with twenty windows and upwards to pay eight shillings. This tax was afterwards so far altered that houses with twenty windows, and with less than thirty, were ordered to pay ten shillings, and those with thirty windows and upwards to pay twenty shillings. The number of windows can, in most cases, be counted from the outside, and, in all cases, without entering every room in the house.

The visit of the tax-gatherer, therefore, was less offensive in this tax than in the hearth-money.

This tax was afterwards repealed, and in the room of it was established the window-tax, which has undergone, too, several alterations and augmentations. The window-tax, as it stands at present