Treasure Coast Locksmith provides restricted key systems services in Port St. Lucie, Stuart, Fort Pierce, Vero Beach, Jensen Beach, and across the Treasure Coast. Call (772) 758-1322 for mobile service. Restricted key systems (Medeco, Mul-T-Lock, Schlage Primus) combine mechanical and legal restrictions on key duplication. Lost keys cannot be copied at hardware stores. Key duplication requires dealer authorization and is logged in a tracking system.
Ideal for households with employees, rental properties, or high-value concerns.
The biggest security gap in most residential keys is duplication. Any hardware store will copy a Schlage or Kwikset key in 2 minutes for $3, no questions asked. If you lose a key, or if a former employee makes an unauthorized copy, or if a curious contractor pockets your key long enough to run it down the street, there's nothing stopping them.
Restricted key systems solve this problem at two levels. Mechanically, the key uses a proprietary profile that hardware stores cannot cut because they don't have the blanks. Legally, the keyway is protected by the manufacturer - only authorized dealers can cut replacement keys, and they require signed authorization from the registered owner before doing so.
Three brands dominate residential restricted keyways on the Treasure Coast. Medeco M3 is the most common and most affordable. Mul-T-Lock MT5+ is the most restrictive and highest security.
Schlage Primus is the easiest retrofit for existing Schlage hardware. We install and service all three.
What restricted key control gives you
- Legal duplication protection - no hardware-store copies possible.
- Dealer-only key cutting - requires owner authorization.
- Key tracking system - every cut logged in manufacturer database.
- Mechanical restriction - proprietary key profile.
- Pick and bump resistance - most restricted keyways also defeat common attacks.
- Master keying support - restricted systems support full hierarchies.
- Owner control over access - manufacturer won't cut without your signature.
- Insurance benefit in some cases - verified restricted key control may reduce premiums.
When restricted keys matter
The situations where the extra cost of restricted keys pays for itself.
Real scenarios calling for restricted keys
- Homeowner in Jupiter Island has a housekeeper, pool service, and handyman with keys - wants to prevent unauthorized copies being made.
- Treasure Coast vacation rental owner worried about cleaning service duplicating keys for personal use during off-season.
- Family home where a former household employee had a key during their employment and owner wants control over whether it can still be copied.
- Stuart business owner with a home office - wants to ensure no one can duplicate keys to the office without authorization.
- Vero Beach home with multiple adult children who had keys at various times - owner wants to prevent third-party duplication.
- Divorce situation where the former spouse may have duplicated keys; standard locks allow continued unauthorized copies.
- Property management company wants master key control that cannot be duplicated by tenants or maintenance staff.
- High-net-worth homeowner concerned about targeted key duplication by household staff or contractors.
How restricted key control works
Restricted key control combines mechanical and legal mechanisms. Mechanically, the key profile is patented and the blanks are proprietary - only manufacturers like Medeco and Mul-T-Lock have them. Hardware stores cannot cut restricted keys because they can't buy the blanks from anyone except the manufacturer's authorized distributor network.
Legally, authorized dealers sign agreements with the manufacturer committing them to verify key-holder identity before cutting replacement keys. For Medeco, this means the owner needs to provide authorization paperwork (signed by the registered owner) for each new key. For Mul-T-Lock, the factory key card must be produced.
The authorized dealer logs each duplication in the manufacturer's tracking system.
The result is a multi-layer protection against unauthorized duplication. A lost key cannot be copied at a hardware store (no blank). A friend or contractor cannot secretly duplicate it at an authorized dealer (no paperwork).
And every legitimate duplication is logged so you have a record of who made copies and when.
How a restricted key system install works
Consultation call
Call (772) 758-1322. We discuss your access control needs and recommend a brand.
Authorization setup
Owner signs the registration paperwork required for the chosen brand.
Onsite installation
Cylinders installed with matched keying and your authorized signatures on file.
Documentation handoff
You receive the authorization paperwork required for future key duplication.
Restricted key ownership tips
- Store your authorization paperwork securely - without it, you cannot get replacement keys.
- Limit key distribution to people you trust. Restricted systems are strongest when few keys are in circulation.
- If a key is lost or suspected compromised, rekey immediately rather than assuming the restriction is enough.
- Document every legitimate duplication in your own records in addition to the manufacturer tracking.
- Restricted systems pair well with master keying for households with differential access needs.
- For maximum control, combine restricted keyways with a documented master key hierarchy.
Related services
Other Treasure Coast Locksmith services in this cluster.
Restricted key system FAQs
Common questions about restricted keyway systems for Treasure Coast residences.
What is a restricted keyway?
A restricted keyway is a key profile protected by patent and by manufacturer distribution agreements. Only authorized dealers have the blanks required to cut keys, and they require signed authorization from the registered owner. The result is that lost or borrowed restricted keys cannot be copied without permission.
How much does a restricted key system cost?
Medeco M3 restricted keyway installation runs $345 to $445 per cylinder. Mul-T-Lock MT5+ runs $395 to $545 per cylinder. Schlage Primus cylinder retrofit (existing Schlage deadbolt) runs $185 to $265.
Full-house restricted key systems typically run $1,400 to $2,800 depending on brand and cylinder count.
Can I still lose a restricted key?
Yes. Restricted keys can still be physically lost or stolen. The difference is that the lost key cannot be copied at a hardware store by whoever finds it.
For maximum security after a lost key, we recommend rekeying even if you think the lost key will not be found.
Who has access to cut my restricted keys?
Only authorized dealers for your specific brand. For Medeco, there are dozens of authorized dealers nationally but fewer on the Treasure Coast. We are one of them.
For Mul-T-Lock, the dealer network is smaller. For Schlage Primus, the network is largest. Any authorized dealer can cut your keys with your authorization.
Can I cut restricted keys myself at home?
No. Restricted keys require specialty factory equipment that is not sold to homeowners. Attempting to modify or duplicate a restricted key yourself will damage the key and compromise the lock's security.
Always use authorized dealer services.
What happens if the dealer that installed my restricted system goes out of business?
Your authorization paperwork transfers to any other authorized dealer. You can bring the paperwork to a different Medeco, Mul-T-Lock, or Schlage dealer and they can cut replacement keys from the manufacturer database. Authorization is tied to ownership, not to the original installer.
Can restricted keys be rekeyed?
Yes. Authorized dealers can rekey restricted cylinders the same way as standard cylinders, using the manufacturer pin kits. Rekey runs slightly higher than standard because of the specialty pin work involved.
Typical is $75 to $155 per cylinder depending on brand.
Are restricted keys more durable than standard keys?
Yes, typically. Restricted keys are usually machined from higher-grade brass alloy and finished to tighter tolerances than standard hardware-store keys. They last longer and resist bending better.
Some Mul-T-Lock keys include additional metal reinforcement.
Does a restricted keyway automatically make the lock high-security?
Usually yes, because all three major restricted brands (Medeco, Mul-T-Lock, Primus) also include pick and bump resistance in the cylinder design. It's possible to have a restricted keyway without high security, but the major residential brands combine both features for comprehensive protection.
Can I combine restricted keys with smart locks?
Partially. Smart locks with standard cylinders (Schlage Encode, Yale Assure) have mechanical backup cylinders that can be upgraded to restricted. But the smart lock's digital codes operate independently and don't gain restricted-key protection.
For maximum control, use restricted keyway on the mechanical backup and manage codes carefully.
What if my restricted key breaks?
Bring the pieces to us. We verify your ownership, cut a replacement key from the pieces or from the lock itself, and log the duplication in the tracking system. Key replacement for a broken key typically costs $35 to $75 for Medeco, $45 to $95 for Mul-T-Lock, $25 to $55 for Schlage Primus.
Are restricted keys HOA-approved?
Yes, in most Treasure Coast HOAs. Restricted keyways are installed in standard residential hardware (Schlage bodies, Medeco deadbolts, Mul-T-Lock deadbolts) that meet HOA finish and style requirements. The restriction is in the keyway, not the external appearance of the lock.