When a lock sticks, jams, or stops turning, the first question is usually straightforward: can it be repaired, or does it need to be replaced? The answer depends on what is broken, how old the lock is, and how much security you need from it. This guide explains the common lock problems that can be fixed, the situations where replacement makes more sense, and the typical cost ranges for both.
You will also find the factors that push prices up or down, a simple way to decide between doing the work yourself and hiring a professional, and the questions worth asking before any work begins.
Why Locks Stop Working
Most lock failures come from a handful of causes. Wear and dirt are the most common. Dust, grit, and old lubricant build up inside the cylinder and make the pins drag, which is why a key may suddenly feel stiff or grind as it turns.
Misalignment is the next big cause. When a door swells, sags, or settles, the bolt no longer lines up with the hole in the frame. The lock itself is fine, but it cannot close or open smoothly. Forced entry, a broken key, and simple old age round out the list.
Common signs a lock needs attention
- The key turns with difficulty or stops partway.
- The key spins freely without locking or unlocking anything.
- The handle or knob feels loose, wobbly, or sagging.
- The deadbolt does not extend fully into the door frame.
- A key has snapped off inside the cylinder.
- The lock housing is cracked, bent, or visibly damaged.
Repair or Replace? How to Decide
In most cases, the deciding factor is whether the damage is to the moving parts or to the body of the lock itself.
- Repair is usually enough when the problem is dirt, stiffness, misalignment, a worn key, or a loose handle. These are mechanical issues that a service visit or a small part can fix.
- Replacement is usually better when the lock body is cracked, the cylinder has been forced, the hardware is very old, or you want a higher level of security than the current lock provides.
- Replacing only the cylinder is a middle option. It keeps the existing hardware but gives you a fresh keyway and a new set of keys.
A useful rule of thumb: if a repair costs more than roughly half the price of a comparable new lock, replacement is often the better value.
Lock Repair Options and Typical Costs
The ranges below are rough estimates for parts and labor. Prices vary widely by market, lock type, and time of service. Emergency or after-hours calls usually cost noticeably more, and many professionals charge a minimum service fee even for small jobs.
Cleaning and lubrication
A stiff or gritty lock often just needs the old lubricant flushed out and a dry, lock-safe lubricant applied. If you do it yourself, the cost is a few dollars for supplies. A professional service call typically runs about $50 to $100, mostly covering the trip and minimum fee.
Rekeying
Rekeying changes the internal pins so that old keys no longer work, while the lock itself stays in place. It is the standard fix after moving into a new home or losing a key. Expect roughly $20 to $60 per lock in parts and labor, with multi-lock discounts common.
Cylinder replacement
If the cylinder is worn, damaged, or you want a different keyway, the cylinder alone can be swapped. Typical cost is about $30 to $100 per cylinder installed, depending on the security level of the replacement.
Broken key extraction
A key that snaps off inside the lock has to be removed before anything else can be done. Extraction generally runs about $50 to $150, and the lock may also need to be rekeyed afterward.
Strike plate, latch, and alignment repair
When a door has settled, the fix is often to adjust or reposition the strike plate, file the opening slightly, or replace the latch. This type of repair commonly costs $50 to $150 including the service visit.
Handle, knob, and deadbolt hardware
Tightening loose screws is a free fix. Replacing a worn handle, knob, or deadbolt mechanism typically costs $20 to $80 for the part, plus labor if a professional installs it.
Lock Replacement Options and Typical Costs
Replacement means installing a completely new lock or lockset. The final price has two parts: the hardware and the installation.
Typical hardware prices
- Basic entry knob or lever: about $15 to $50.
- Standard deadbolt: about $20 to $70.
- Keyed entry set with matching deadbolt: about $40 to $120.
- High-security mechanical lock: about $80 to $250.
- Keypad or smart lock: about $100 to $350.
- Mortise lockset (common on older or commercial doors): about $100 to $400.
Typical installation costs
Professional installation generally runs about $50 to $150 per lock when the new hardware fits the existing holes. If the door needs new holes drilled, a larger cutout, or repairs to the door edge, expect another $75 to $250 per door. Installing a mortise lock or adapting a door for different hardware usually sits at the higher end.
What Affects the Total Cost
- Lock type and security grade: higher-grade hardware costs more but resists forced entry longer.
- Number of locks: per-lock prices usually drop when several locks are done in one visit.
- Door material: solid wood, metal, and glass-panel doors take more time and different tools than a standard hollow door.
- Whether door modification is needed: drilling or enlarging holes adds labor.
- Time of service: nights, weekends, and holidays often carry surcharges.
- Local labor rates: the same job can cost noticeably more in one market than another.
- Parts availability: uncommon sizes or older hardware may need to be ordered.
Do It Yourself or Hire a Professional?
Some jobs are reasonable to handle yourself. Others are best left to a professional.
Good do-it-yourself tasks: tightening loose screws, lubricating a stiff cylinder, replacing a like-for-like knob or deadbolt that fits existing holes, and cleaning debris out of a latch opening.
Better left to a professional: rekeying, broken key extraction, mortise lock work, any job that requires drilling new holes, locks that have been forced, and high-security or commercial hardware.
If you are renting, check your lease before changing any lock. Many leases require the landlord to handle lock work or to receive a copy of any new key.
How to Keep Costs Down
- Bundle several locks into one service visit instead of calling for each one separately.
- Schedule work during normal business hours when possible.
- Ask whether rekeying would solve the problem instead of full replacement.
- Choose hardware that fits your existing holes so no door modification is needed.
- Keep locks clean and lightly lubricated to prevent repeat service calls.
- Get a written estimate before work begins, including parts and any trip fee.
Questions to Ask Before Work Begins
- Is repair possible, or is replacement necessary?
- What is the total price, including parts, labor, and any service fee?
- Is the replacement hardware the same size as the existing lock?
- Will new keys be provided, and how many?
- Is there a warranty on the parts and the work?
Conclusion
Most lock problems fall into two groups: issues with moving parts, which are usually repairable for around $50 to $150, and damage to the lock body itself, which calls for replacement. Rekeying is the cheapest way to get new keys without new hardware, while full replacement costs roughly $70 to $500 per door once hardware and installation are combined.
The simplest next step is to identify exactly what is failing. If the key turns but the lock does not engage, or the bolt will not reach the frame, the problem may be alignment rather than the lock — often the least expensive fix of all. If the hardware is cracked or has been forced, plan for replacement and budget for the hardware, the installation, and any door preparation needed.
For more practical answers to everyday home and repair questions, explore the other guides on this site.