A lost house key or worn-out original can trap you in inconvenient situations—but duplication is straightforward and affordable. Understanding the cost structure and process upfront saves you time and helps you avoid overpaying or choosing a poor copy. Here's what you need to know before you visit a key cutter.
What Determines House Key Duplication Cost
House key duplication typically costs $2 to $10 per key at most retail locations, though specialty or high-security keys can run $15–$50 or more. The price depends on several factors:
- Key type: Standard brass or nickel keys are cheapest; laser-cut, smart keys, or high-security blanks cost significantly more
- Where you go: Big-box hardware stores (Home Depot, Lowe's) and supermarkets usually undercut locksmiths, but locksmiths often handle complex or worn originals better
- Blank availability: If the cutter must special-order a blank, expect a delay and a higher fee
- Volume discounts: Ordering 3+ copies sometimes triggers a per-key discount
If your key is worn, damaged, or an unusual profile, a locksmith will typically charge more because hand-fitting or additional inspection time is required.
The Duplication Process: Step by Step
A competent key cutter follows a consistent method to ensure your duplicate works reliably.
1. Inspect the original key The cutter examines your key's profile, depth cuts, and overall condition. Worn or corroded originals may not produce accurate copies; they'll ask if you want them to proceed anyway (and may recommend getting a new original).
2. Select the correct blank The cutter matches your key's profile to a blank that mirrors its shaft diameter, head shape, and tooth spacing. This is where experience matters—a wrong blank wastes time and money.
3. Secure the original and blank Both keys clamp into the machine's vise, with the original on one side and the blank on the other. Proper alignment here is critical for accuracy.
4. Cut the duplicate A rotating cutting wheel traces the original's cuts onto the blank. The process takes 30 seconds to 2 minutes depending on equipment and key complexity. Laser-cut or security keys may require specialized machines and take longer.
5. Test and finish The cutter tries the duplicate in a sample lock (if available) or checks its teeth against the original under magnification. Light filing or deburring smooths any rough edges.
The entire process usually takes 5–15 minutes for standard keys at a walk-in location.
Where to Get House Keys Duplicated
Hardware stores and supermarkets Fastest option for standard keys; staff turnover means quality varies. Usually $2–$5 per key with no appointment needed. Best for simple brass keys you're confident about.
Dedicated locksmiths Slower and pricier ($8–$15+), but they handle tricky originals, worn keys, and specialty blanks. They'll often inspect your key more carefully and flag potential issues. Useful if your original is old or you've had bad copies before.
Big-box retailers (Home Depot, Lowe's) Similar pricing to supermarkets; in-store kiosks operate during store hours. Sometimes they refuse worn keys or unusual profiles outright, so call ahead if you're uncertain.
Online key cutting services A handful of companies ship you pre-cut keys based on photos or measurements. This works only if your key is standard and you're comfortable with remote ordering. Turnaround is 5–10 business days, and prices range $5–$15 per key plus shipping.
Mercoly helps you compare and find trusted key cutting and duplication providers in your area, making it easy to check reviews and availability before you visit.
Red Flags to Watch
Avoid cutters who refuse to inspect your original closely, guarantee a perfect copy on damaged keys, or seem unfamiliar with your key's profile. If a duplicate doesn't work smoothly in your lock after testing, ask for a redo immediately—reputable cutters warranty their work for at least one free replacement.
Frequently Asked Questions
Q: How can I tell if my key is "high-security"? High-security keys have an unusual or patented profile, often with dimples or asymmetrical cuts that don't match standard blanks; your locksmith will identify this instantly, or you can ask your building manager or original key supplier.
Q: Can I duplicate a key from a photo? Some online services accept detailed photos, but accuracy drops significantly without holding the original—use this only for backup copies if you've already tested a working duplicate.
Q: What if my original key is too worn to copy accurately? A locksmith can often re-key your lock and create a new original from scratch, typically costing $15–$40 depending on lock type; this is cheaper than replacing the lock entirely.
Compare local key cutting providers on Mercoly to find the fastest, most affordable option near you.