The cost to rekey a house depends on the number of locks being changed, the type and condition of the hardware, how the locks are configured, how many new keys are needed, and whether any doors require repair or replacement instead of a simple rekey.
Because residential lock setups vary so much, there is no single price that accurately applies to every home.
The most useful way to think about rekeying cost is to look at the scope of the job. A home with one compatible exterior lock is a very different project from a property with several deadbolts, knob locks, garage-entry locks, mixed brands, damaged cylinders, and multiple keying requirements.
If you recently purchased a home and your main question is whether and how to rekey after moving in, see How Lock Rekeying Works for New Homeowners.
Summary
- There is no universal cost to rekey a house.
- The number of lock cylinders is one of the biggest factors affecting job scope.
- Lock type and compatibility can affect whether a lock can be rekeyed normally.
- The condition of the existing hardware matters.
- Asking several compatible locks to work with one key can change the scope of the job.
- The number of new keys requested can also affect the service.
- Some locks may need repair or replacement rather than rekeying.
- Mixed lock brands or keyways can make a whole-house rekey more complicated.
- A locksmith can provide a more accurate quote when given the number of doors, lock types, and desired keying setup in advance.
- Rekeying and replacing locks are different services and should not be treated as interchangeable.
Best Way to Get an Accurate Rekeying Quote
The best way to understand the likely scope of a rekeying job is to inventory the locks before contacting a locksmith.
For each exterior opening, note:
- How many locks are on the door
- Whether there is a deadbolt
- Whether there is a knob or lever lock
- Whether both locks currently use the same key
- Whether different doors use different keys
- Whether any hardware is loose, damaged, or difficult to operate
- Whether you want several locks to work from one key
- How many new keys you need
Photos of the existing hardware may also help the locksmith understand what is installed.
"The cost of rekeying is driven by the actual lock setup, not simply by the number of doors in the house. Two homes with the same number of entrances can involve very different numbers and types of cylinders." - KeyMe Locksmiths
What Does Rekeying a Lock Mean?
Rekeying changes a compatible lock so that a different key operates it.
The existing lock hardware may remain installed, but the internal keying is changed so the old key no longer works as before.
That makes rekeying different from:
- Replacing the entire lock
- Installing a new deadbolt
- Repairing damaged hardware
- Copying an existing key
This distinction matters when comparing quotes.
A locksmith may arrive expecting a rekeying job and discover that some of the existing hardware is damaged, incompatible, or otherwise unsuitable for rekeying.
At that point, the scope changes.
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What Affects the Cost to Rekey a House?
Several factors can influence the final quote.
1. Number of Lock Cylinders
A house with one lock cylinder involves less work than a house with several.
For example, a home might have:
- Front-door deadbolt
- Front-door knob lock
- Back-door deadbolt
- Back-door lever lock
- Garage-entry deadbolt
- Side-door lock
That is six possible cylinders even though there are only three doors.
This is why asking "How much does it cost per door?" can be misleading.
A better question is:
How many lock cylinders need to be rekeyed?
2. Type of Lock
Different locks can use different cylinder designs, keyways, and rekeying procedures.
Residential hardware may include:
- Deadbolts
- Knob locks
- Lever locks
- Mortise cylinders
- Rim cylinders
- Smart locks with mechanical cylinders
- Other compatible residential hardware
The exact lock type matters because not every lock is serviced the same way.
3. Lock Brand and Keyway Compatibility
A homeowner may want every exterior door to operate from one key.
That can be possible when the hardware is compatible.
But locks from different manufacturers or different keyway families may not necessarily be able to accept the same physical key.
If the existing hardware is incompatible, the locksmith may need to explain other options.
This is another reason a whole-house rekey is not simply "one lock times the number of doors."
4. Condition of Existing Hardware
Rekeying assumes the existing lock is suitable for continued use.
If a locksmith finds:
- Damaged cylinder
- Loose hardware
- Worn components
- Binding latch
- Broken key inside the lock
- Misaligned door or strike
- Lock that no longer operates normally
the issue may require more than rekeying.
That could change the scope to include repair or replacement.
For hardware-condition questions, see lock repair and installation.
5. Number of New Keys Needed
After the locks are rekeyed, new physical keys may need to be produced.
A household may need keys for:
- Homeowners
- Family members
- Trusted caregivers
- Other authorized users
The number of keys requested can be part of the overall job.
If additional household keys are needed later, KeyMe also offers key duplication for supported keys.
6. Whether Locks Should Be Keyed Alike
Some homeowners want multiple compatible locks to operate using one key.
For example:
Front door + back door + garage entry → one household key
That can simplify day-to-day key management when the installed hardware supports the same keyway.
Other homeowners may intentionally want different keys for different doors.
The desired configuration should be discussed before the locksmith begins work.
7. Whether Some Locks Need Replacement Instead
A rekey changes which key operates the existing compatible cylinder.
It does not make damaged or unsuitable hardware new again.
Replacement may be more appropriate when:
- Hardware is broken
- Lock cannot be rekeyed
- Homeowner wants a different lock type
- Hardware no longer functions properly
- Existing locks are incompatible with the desired keying setup
The decision between those services belongs in Rekeying vs. Replacing Your Locks.
8. Overall Service Scope
The final job may involve more than changing pins or internal keying.
A locksmith may also need to:
- Remove and reinstall hardware
- Inspect existing cylinders
- Identify compatible keyways
- Cut new keys
- Test each lock
- Confirm that old keys no longer operate the rekeyed locks
- Address hardware issues discovered during service
The more complex the property and hardware configuration, the more variables are involved in the quote.
Why the Number of Doors Does Not Tell the Whole Story
Consider two houses.
House A
- Front door with one deadbolt
- Back door with one deadbolt
Total: two cylinders.
House B
- Front door with deadbolt and knob lock
- Back door with deadbolt and lever lock
- Side door with deadbolt
- Garage-entry door with deadbolt and knob lock
Total: seven possible cylinders.
Both may be described casually as "a house with a few doors."
The actual rekeying scope is very different.
That is why counting locks and cylinders is more useful than counting only doors.
Does Rekeying Every Lock to One Key Affect the Job?
It can.
Keying compatible locks alike may require the locksmith to configure each cylinder so it accepts the same new key.
The feasibility depends on the existing hardware.
If every lock uses a compatible keyway, the setup may be straightforward.
If the home contains multiple incompatible lock families, the homeowner may need a different plan.
That is something to identify before assuming the entire house can use one key.
Does a Smart Lock Need to Be Rekeyed?
Some smart locks still include a traditional mechanical key cylinder.
If so, the mechanical cylinder may be relevant to a rekeying project.
Other smart locks use different physical designs.
The electronic access settings and the mechanical keying should be treated as separate systems.
A homeowner updating digital access should follow the lock manufacturer's instructions for:
- User codes
- App access
- Guest permissions
- Digital credentials
while a locksmith can address compatible mechanical keying.
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Can You Rekey Only Some Locks in the House?
Yes.
The job can be scoped to the locks the homeowner wants changed, assuming the hardware is compatible.
For example, someone may choose to rekey:
- Exterior doors
- Garage-entry door
- Detached garage
- Storage room
without changing interior privacy locks.
The quote should reflect the actual set of cylinders being serviced.
Should You Rekey a Lock That Is Hard to Turn?
Not automatically.
A difficult lock may have a keying problem, but it may also involve:
- Worn key
- Worn lock
- Misaligned door
- Misaligned strike
- Latch pressure
- Loose hardware
- Other mechanical issues
Rekeying changes which key operates the cylinder.
It does not automatically correct every mechanical problem with the door or lock.
If the lock already operates poorly, mention that when requesting service.
Rekeying vs. Replacing: Why the Difference Matters for Cost
These are separate services.
Rekeying
Changes the lock's internal keying so a new key works.
Replacing
Removes the existing hardware and installs different hardware.
A homeowner comparing quotes should make sure each provider is quoting the same scope.
A quote to rekey six compatible cylinders should not be directly compared with a quote that includes replacing several locks.
For the complete decision framework, see Rekeying vs. Replacing Your Locks.
What Should You Tell the Locksmith Before Requesting a Quote?
The more accurate the information, the more useful the initial estimate can be.
Provide:
Number of Exterior Doors
List the entrances you want included.
Number of Locks on Each Door
Specify whether each has:
- Deadbolt
- Knob lock
- Lever lock
- Other cylinder
Lock Brands if Known
This can help identify possible compatibility issues.
Current Keying Setup
Explain whether:
- One key already works several doors
- Every door has a different key
- You are not sure which key goes where
Desired Final Setup
For example:
- One key for all compatible exterior locks
- Different keys for selected areas
- Rekey only certain entrances
Hardware Problems
Mention anything that:
- Sticks
- Binds
- Feels loose
- Has a broken key
- Does not latch correctly
Number of New Keys
Tell the provider how many household copies you expect to need.
What If You Just Bought the House?
Buying a home is a common reason to reconsider who has working keys.
However, the cost page should stay focused on the quote and job scope.
For the broader move-in question, including why new homeowners may choose to establish new key control, which doors to review, and how the process fits into a move-in checklist, see How Lock Rekeying Works for New Homeowners.
What If You Lost a House Key?
A lost key creates a different decision than simply planning a routine whole-house rekey.
The homeowner may need to consider:
- Where the key was lost
- Whether it identifies the property
- Whether other copies still exist
- Which locks the missing key operates
That incident-response intent belongs in What to Do After Losing Your House Keys.
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How KeyMe Locksmiths Can Help With Rekeying
For supported residential locks, KeyMe offers lock rekeying services.
Related residential services include:
The appropriate service depends on the existing hardware and what the homeowner wants to change.
