Most people assume they can duplicate any key as many times as they want—until they hit a lock that's restricted or patented. Understanding the actual limits, costs, and logistics of key duplication will save you frustration and money.
How Many Copies Can You Actually Get?
There's no hard legal limit on duplicating standard residential or commercial keys. A locksmith can theoretically make unlimited copies of a basic house key, car key, or office key as long as you own or have permission to duplicate the original. However, the practical answer depends on the key type and your access to a locksmith.
Most locksmiths will duplicate a standard key 5–10 times in a single session without question. For larger batches (20+ copies), you may need to schedule an appointment or pay a setup fee. Some services offer package pricing: duplicating 3–5 keys might cost $2–4 per key, while 10–20 copies could drop to $1–2 per key depending on your location and key complexity.
Restricted and Patented Keys: The Real Barriers
This is where duplication hits a wall. Restricted keys—typically for high-security locks—require proof of ownership or authorization from the lock manufacturer. Brands like Medeco, ASSA ABLOY, and Schlage offer restricted keyways specifically to prevent unauthorized duplication.
If you try to duplicate a restricted key at a standard hardware store, they'll likely refuse. Your only legitimate option is to contact the lock manufacturer directly or work with an authorized locksmith who has the proper credentials and equipment. This process takes 1–3 weeks and costs $15–50 per key—significantly more than standard duplication.
Patented keys operate similarly but are protected by intellectual property law rather than just physical restrictions. Attempting to duplicate them without authorization could expose you to legal liability, so verify ownership before proceeding.
When You Actually Need Multiple Copies
Bulk duplication makes sense for specific scenarios:
- Property management: Landlords duplicating keys for 10+ rental units
- Office transitions: Providing copies to new team members during onboarding
- Estate planning: Creating backups for multiple household members
- Emergency preparedness: Making spares for aging parents or trusted neighbors
For each scenario, plan ahead. If you need 15 keys by next week, a hardware store kiosk will take 2–3 minutes per key. If you need 50 keys by next month, a professional locksmith with bulk pricing is more efficient and cost-effective.
Finding and Comparing Duplication Services
Your options break down into three tiers:
Hardware store kiosks ($1–3 per key, 2–5 minute wait): Fast for 1–3 copies, limited to standard keys, minimal customization.
Local independent locksmiths ($3–8 per key, same-day to next-day): Better for restricted keys, faster turnaround on bulk orders, personalized service, but prices vary widely by region.
Franchised locksmith chains ($2–6 per key, consistent pricing): Middle ground between hardware stores and independents, reliable for commercial clients.
If you're comparing multiple locksmiths in your area, Mercoly helps you find and evaluate trusted key cutting and duplication providers in one place—saving the legwork of calling five shops for quotes.
Always ask about:
- Whether they duplicate restricted keys
- Bulk pricing tiers (how much per key at 10, 25, 50 copies)
- Turnaround time for your specific volume
- Whether they accept digital key images or need the original
Cost Expectations by Key Type
Standard residential keys run $1–3 per copy. Car keys (without electronic fobs) cost $3–8 depending on age and make. High-security or restricted keys jump to $15–50 per copy if available at all. Padlock keys typically cost $2–5 per duplicate.
Bulk discounts usually kick in at 10+ copies; expect 15–25% off the per-key rate.
Frequently Asked Questions
Q: Can I get copies made if I've lost the original key? A: Yes, most locksmiths can create new keys from a lock code (found on the lock cylinder or documented registration) or by decoding the lock itself, though this costs $25–75 versus $2–5 for a standard duplicate.
Q: Why would a locksmith refuse to duplicate my key? A: They may suspect it's a restricted or patented key, the key appears worn or damaged in a way that suggests misuse, or they need legal proof of ownership—all legitimate safeguards against unauthorized access.
Q: How do I know if my key is restricted? A: Check the keyway itself for "do not duplicate" markings, consult the lock manufacturer's website with your lock model, or simply ask a locksmith—they can identify restricted keyways instantly.
Use these guidelines to make informed decisions about key duplication costs and timelines for your situation.