"There's an awful lot to do to bring it up to 20th century comfortable living."
She said hide and seek with her sons, Alfred and Vesey, would now be "out of control" in the enormous house.
Lady Edward said: "I'm worried that I might lose them behind a tapestry or down a tunnel - I'm going to put GPS on them."
She added: "I spent three years hoovering and a year of that tidying up. The windows have been cleaned for the first time in 28 years."
The family are currently living in a house on the Haddon estate and are gradually moving their possessions into the hall.
Lady Edward said: "Breathing new life into Haddon comes from us living at Haddon permanently. There is a new energy - for years it's been quietly resting.
"The family left in Queen Anne's reign and we're the first family back in it."
The couple are keen to attract visitors to the historic house and Lady Edwards said: "We want more families to come to Haddon as it is living history."
The big attractions at Haddon this year will include the unveiling of tapestries which haven't been seen for nearly 100 years.