Updown Court is a private residence in windlesham, Surrey, England and is the most expensive private residence that is currently on the market. It is the largest private residence to be built in the United Kingdom since the 19th century and is currently still listed with Savills and Hamptons International, UK. It was launched on the market in 2005 for £70,000,000.

Entered by a $3million heated marble driveway, Updown Court has 103 rooms, of which the 24 bedrooms each has its own marble en-suite bathroom. Among other features, it has a two lane bowling alley, five swimming pools, squash court, floodlit tennis court, wine cellar, and panic room in the event of a terrorist attack, 5 acres (20,000 m2) of more than 30 different types of imported Italian marble, expansive terraces, and a 50-seat cinema. It also features an underground garage, with granite flooring, that has enough room to harbor eight limousines. The first floor is the main residential area, featuring 8 generous bedroom suites. The penthouse floor contains two separate penthouses, each with 2 bedrooms and occupying an entire wing of the property.

The estimated cost for upkeep alone is over £250,000 (Over $360,000 USD) per year. Reference: See Press Release on Updown Court Website.