I must admit that I did not read every single word of Kensington Palace (Edward Impey, 2003). A few scenes in my WIP are set there, so I got this book through interlibrary loan in hopes of finding floor plans and images to help me make the setting more vivid. So I skimmed through the details of William and Mary's and Anne's reigns, and I didn't pay much attention to anything after my story's time period.
The floor plans weren't as detailed as I hoped, so I'll just have to fudge a bit. Which may be just as well, because a whole page of, "She sneaked from Room X to Room Y, then ducked out into the passage because there was no connecting door to Room Z," would make for dull reading. But I did get my visuals, so I think I'll be able to make my scenes evoke Kensington Palace rather than Random Great House.