The supermodel's luxury £10m mansion is one of several exclusive properties, and it is said her basement was particularly badly hit.
Speaking to The Sun newspaper, a fellow resident said: "I know Kate's basement flooded.
"It cost thousands in repairs to fix the lining."
Other homeowners on her street have reportedly blamed £50m works at the nearby Witanhurt mansion in north London for the flood.
The 65-room home hosted now-defunct BBC talent show Fame Academy in 2002, and recent work saw a two-storey underground expansion with a bar, gym, 70-foot swimming pool , cinema and 25-space car park - although Camden Council representatives have said pre-planning assessments found no significant risk of flood.
In happier news for the 39-year-old star, it was recently reported she is going to record a song with her husband Jamie Hince - guitarist for indie rockers The Kills - to celebrate her 40th birthday.
A source had revealed: "She's working on the song at the moment with husband Jamie Hince. It's shaping up to be a rocky number about her iconic career.
"Kate really wanted to mark the milestone birthday by recording the track and playing it at the big party she'll be having."
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