The Pride and Prejudice actress plans to carry out extensive building work to boost security, and has already CCTV and high-security shutters.
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Keira Knightley has been forced to beef up security at her London home after an incident with her stalker.
The actress is "too scared to go outside" after a convicted flasher Mark Revill repeatedly delivered letters, postcards and a USB containing a song he had written for her, The Sun reports.
Revill also made cat noises through the letterbox of the 32-year-old's $6.5 million north London home she shares with her husband James Righton, and their two-year-old daughter Edie.