Northeast Wisconsin’s commercial security specialist




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Locksmith Services

No Auto or Residential Available

Master Key Services

Utilizing a high end masterkeying software, Lappen Security has the ability to design a Masterkey system for any size commercial or industrial building. Our software also features a customer key management software which allows you to be in control of your system and on the same page with us, and updates that link together so we are always on the same page. CAD drawings for your building are also a service we offer which allows for detailed visibility of how your building’s Masterkey system is designed and will work.

Local Commercial Locksmith

Centrally located in the Fox Valley, Lappen Security has a certified locksmith on staff. We cover the Appleton, Green Bay, Oshkosh, and Sheboygan WI area. Need a key replacement or an extra set of keys made for your office? Looking to change a lock after an employee leaves the company? Turn to Lappen! We cut keys, re-key locks and supply/install commercial locks and door hardware to help you maximize business security.


High Security Locks & Hardware

  • Bi-Level
  • Keymark X4
  • Available in Rim, Mortise, Key-in-Knob, Padlock, Interchangeable Core Cylinders
  • Medeco door locks are UL437 Tested
  • Medeco & KeyMark Patented Key Control
  • Certified & Trained Locksmith

Our security service technicians are trained to:

  • Install high-security door locks
  • Service entry door, keyless door and deadbolt locks
  • Repair door hardware and door closers
  • Re-key door locks and master key systems
  • Re-key high security door locks, including Medeco
  • Provide wide-ranging panic hardware including electronic and retrofit

PLEASE NOTE: We do not provide any automotive-related key or locksmith services.