We are often asked at shows for advice on introductory books on Georgian and Regency houses. Here are a few favourites:
Stephen Parisien does a number of good style primers: "Adam Style", "Palladian Style" and "Regency Style" all published in paperback by Phaidon Press. Try also "Georgian and Regency Houses Explained" by Trevor Yorke, published by Countryside Books. These provide a really clear summary supported by useful black and white photographs and annotated line drawings.
For a solid review of social mores and domestic politics in Georgian houses try Amanda Vickery's "Behind closed doors - at home in Georgian England". It's a fascinating glimpse of a totally different world and gives context to some of the aspects of Georgian house use that we think quaint today.