The 89-year-old monarch - who spends most weekends at Windsor - could qualify for "millions" of pounds of compensation aimed at mitigating the effects of noise from a third runway at Heathrow, the Sunday Times reported today.
The 900-year-old castle, where 10 sovereigns, including Henry VIII and Charles I, are buried, is the oldest and largest occupied castle in the world and covers 13 acres.
As well as being an official residence of the Queen, the castle attracts thousands of visitors each year. It is located near a potential "island of noise", according to modelling of the impact of a third runway by the Department for Transport.
"Windsor is comparable to parliament, potentially bigger, and if they do need to insulate the Windsors against noise it will cost a fortune - potentially millions.
Also Read
"They will end up spending more on compensation to the Queen than they spent in the past 10 years on noise compensation. Planes can fly pretty low over Windsor," the paper quoted a senior Whitehall source as saying.
Prime Minister David Cameron is now considering whether to allow a third runway at Heathrow, which was backed by an independent airports commission in a report this month.
Heathrow has promised to invest 700 million pounds in noise insulation, as part of a 1 billion pounds compensation scheme if a third runway goes ahead.
Heathrow said more than 160,000 households could be eligible for noise insulation "including in Windsor".
"The final number and location would be dependent on the design of routes...And the actual level of the noise measured," the paper quoted a spokesman as saying.