Lost a key, moved into a new home, or concerned about security? The choice comes down to changing your existing locks or replacing them entirely.
Here’s the simple breakdown: rekeying changes the internal pins of your lock cylinder so old keys stop working, while replacement removes the old hardware and installs brand-new locks. Updating the lock with new keys is quicker and more affordable, while full lock replacement is a better choice when the hardware is worn, damaged, or outdated.
For homeowners across Eastern Pennsylvania, the right choice depends on your current locks’ condition, how you use the property, and the security level you need for your door locks. This guide explains both options clearly, without pressure to overspend.
Rekey Locks: What It Means and When It Works Best
Lock rekeying means adjusting the internal components of a lock cylinder so it works with a new key. The exterior hardware stays the same. A locksmith removes the cylinder plug, changes the pins and springs, and cuts a key that matches the updated configuration.
This lock update is common in residential settings because it resolves access issues without replacing door hardware that still works properly.
When Lock Rekeying Makes Sense:
- Moving into a new home and unsure who has copies
- Lost or stolen keys
- Tenant turnover or rental properties
- Wanting multiple exterior doors to work with the same key
- Updating access without changing the existing hardware style
Advantages:
- Lower cost than full lock replacement
- Quick service, typically completed in one visit
- Keeps your current knobs, levers, and deadbolts
- Prevents old keys from working immediately
Limits to Rekeying:
Rekeying locks won’t fix mechanical wear. If the lock cylinder sticks, grinds, or fails to turn smoothly, it only changes access, not durability or strength. That gritty feeling when the cylinder turns signals the parts are worn out, no matter how many new pins you install.
In cases like this, deadbolt lock repair or full replacement may be needed to restore smooth operation and reliable security.
When Lock Replacement Is the Better Choice
Lock replacement involves removing existing hardware and installing new locks. This includes new cylinders, screws, plates, and often a new deadbolt lock or handle set.
Replacement is recommended when the lock itself is the weak point, not just the key. Understanding the different types of door locks—from standard deadbolts to multi-point systems—helps homeowners choose hardware that matches their security needs.
Situations That Call for Lock Replacement:
- Break-ins or forced entry damaged the lock
- Old, rusty, or builder-grade locks on exterior doors
- Frequent jamming or failure to turn
- Upgrading to higher security deadbolts
- Switching to smart locks or keyless entry
- Multi-point locks that no longer align properly
Benefits of Replacing Locks:
- Stronger security with modern lock types
- Opportunity to upgrade style and finish
- Better resistance to tampering and break-ins
- Improved reliability on the front door and main entry points
Replacement costs more upfront, but it can save money long term when current locks are already near failure.
Cost Comparison: Rekeying vs. Replacement
Cost is frequently the deciding factor for homeowners, and the price gap between rekeying and replacement can be significant.
Cost to Update Your Locks
Rekeying is generally the lowest-cost way to secure your home. Most lock-updating services cost around $15–$50 per cylinder, depending on the number of locks and whether you already have an existing key.
For a typical three-door house, a full rekeying job usually lands in the $150–$250 range, including the service call. No new hardware is needed, which keeps costs down and makes this a popular option for new homeowners and tenants.
Lock Replacement Cost
Lock replacement includes new hardware, installation, and setup, so the price is higher. Standard residential lock replacement usually ranges from $80–$200 per lock, depending on the brand, lock grade, and style.
Grade 1 deadbolts generally fall between $100–$300 per lock, while smart locks and high-security models can exceed $300 per unit. Professional installation typically adds $75–$100 per hour in labor, especially if adjustments are needed.
A practical rule: if your door locks are 7–10 years old and showing mechanical wear, or if they’re builder-grade locks more than 5–7 years old, replacement usually makes more sense than rekeying again. Higher-quality locks, with normal use and basic maintenance, can last 15–20 years, making the upfront cost easier to justify over time.
Which Option Is Safer for Your Home?
FBI Uniform Crime Reporting data shows residential burglaries remain common. In 2019, about 55.7% involved forced entry, with average losses of $2,661, and homes accounted for nearly 63% of all burglaries, highlighting the value of upgrading to higher-grade locks.
After a break-in or forced entry, calling an emergency locksmith in Pennsylvania helps secure the door immediately and prevents further access risks.
Security With Rekeying:
Rekeying locks stops previous keys from working. As long as existing hardware is solid, this provides effective security after lost keys or a move. It is safe when the lock body, cylinder, and deadbolt are still in good shape.
Security With Replacement:
New locks offer much better protection against forced entry, especially when you upgrade to ANSI/BHMA Grade 1 deadbolts. These are built for long-term use—typically 10–15 years of normal use—and handle heavy impact far better than basic builder-grade locks.
By comparison, standard Grade 3 locks wear out much faster and offer less resistance, which is why a higher-grade lock is often worth it for main entry doors. Replacement is necessary after break-ins or when the lock itself has structural damage.
Door Locks in Eastern Pennsylvania Homes
Homes in Montgomery, Berks, Bucks, Chester, Delaware, Lehigh, and Northampton counties commonly have a mix of old and new hardware. Older houses may still use original cylinders that don’t hold pins well anymore. Builder-grade locks are common on newer homes and often wear out quickly.
Seasonal humidity also affects locks here. Expansion and contraction can cause misalignment, especially on front doors and storm doors. Knowing local lock types helps determine whether rekeying or replacing is the safer choice.
Note: Pennsylvania experiences a humid continental climate with seasonal variations that can affect metal lock components through thermal expansion and moisture exposure.
How Valley Lock & Door Helps You Decide
Valley Lock & Door approaches this decision with one goal: to choose the option that actually fits your situation. Updating the lock is recommended when the existing hardware is still in good condition. Lock replacement is suggested only when it improves safety or reliability.
As a licensed, bonded, and insured PA contractor (PA084709), VLD evaluates:
- Condition of the lock cylinder and deadbolt
- Door alignment and wear
- Type of access needed for the household
- Budget and long-term security goals
No upselling. No shortcuts. Just clear locksmith services explained in plain terms.
Your Next Step
If you’re deciding between changing your keys or replacing the locks entirely, a professional evaluation can make the choice much clearer. Valley Lock & Door serves homeowners across Eastern Pennsylvania, including Montgomery, Berks, Bucks, Chester, Delaware, Lehigh, and Northampton counties, as well as towns like Boyertown.
A simple inspection can reveal whether updating your existing hardware is sufficient or if full lock replacement is the safer choice, or if replacing locks will keep your home more secure for years to come. You can schedule an inspection or request a quote through our contact page.
Frequently Asked Questions About Changing or Replacing Locks
Is it cheaper to rekey or replace locks?
Changing the keys in your existing locks is usually cheaper than full replacement because it keeps your current hardware and only updates the internal pins. For most homeowners, this approach takes less time, uses fewer parts, and doesn’t require buying new doorknobs or deadbolts.
Lock replacement costs more since you’re paying for new locks, accessories, and installation labor. For example, updating several exterior doors to work with a single key can be a simple, cost-saving solution, while full replacement is better if the locks are worn, damaged, or outdated.
Can I change my door locks without full replacement?
Yes, some locks can be updated as a do-it-yourself project, but it depends on the brand and type of lock you have. Brands like Kwikset and Schlage sell DIY kits at hardware stores, which include the small tools and new pins needed to change which keys work with your existing locks.
That said, updating a lock requires the right tools, steady hands, and patience. One slipped spring can derail the job quickly. Homeowners who want a hassle-free solution can have a professional locksmith handle it efficiently, ensuring every lock works smoothly afterward.
What does it mean to update a lock’s keys?
Updating a lock means changing the internal pins so the old key no longer works, requiring a new key. The exterior hardware remains the same. During this process, a locksmith removes the cylinder plug, swaps the pins, and configures the lock so multiple doors can operate with the same key if desired.
This is common in a new home, after keys are lost, or when tenants move out. In commercial use, rekeying may also be part of a master key system that controls access without replacing every lock.
How much does it usually cost to replace a lock?
The cost to replace a lock varies based on the type of lock, brand, and where it’s installed. A basic replacement on a front door or bathroom door is usually less expensive than installing high-security deadbolts, smart locks, or commercial-grade hardware.
Schlage products often cost more than basic options but last longer. In commercial settings, replacement costs rise because locks are heavier-duty and may need extra accessories or plates. A locksmith can give a clear example price once they see the door and hardware.
Can I replace a lock myself?
Many homeowners can replace a lock themselves if the door and hardware are standard. A round knob or simple deadbolt often comes with screws and instructions, and the job may only take one basic tool.
Still, DIY replacement can run into issues if the door isn’t aligned, the latch doesn’t fit, or the lock doesn’t match existing holes. For commercial doors or older homes with different types of locks, professional help saves time and frustration. The job goes faster, and you avoid carrying the wrong parts back to the shop.
