Whether you’re moving into a new home, upgrading your security, or dealing with a break-in, changing your door locks is one of the simplest ways to protect your property and feel safe. But should you do it yourself or call in a professional?
In this guide, we’ll walk you through how to change a door lock, when it’s safe to go the DIY route, and when it’s smarter to call a locksmith — plus, the cheapest way to change locks on your house without compromising security.
How to Change a Door Lock
If you’re wondering how to change a door lock, it’s actually a relatively straightforward process — assuming you’re dealing with a standard lock and have the right tools.
Basic steps include:
- Remove the old lock and hardware using a screwdriver.
- Insert the new lock into the existing hole.
- Secure it with the included screws and mounting plate.
- Test the door latch and key function.
Most lock kits from hardware stores include everything you need and come with instructions.
How to Replace a Door Lock (Without Replacing the Entire Mechanism)
If you’re looking to change the key but not the entire lock, rekeying is an option. Some kits let you rekey a lock yourself using the existing hardware — or you can bring the lock cylinder to a locksmith.
This is often the cheapest way to change locks on a house when you don’t need a full upgrade.
When You Can Change a Lock Yourself
DIY is totally fine in these cases:
- ✅ Replacing a basic knob or deadbolt – Most standard locks take under 30 minutes to install.
- ✅ Rekeying with a kit – If you’re comfortable following instructions, a rekeying kit can save money.
- ✅ Interior doors or privacy locks – These are low-risk and easy to swap.
When You Should Call a Locksmith
Some situations require professional help:
- ❌ After a break-in or attempted break-in – A locksmith can assess the entire doorframe, not just the lock.
- ❌ High-security or smart locks – These often have complex mechanisms or software that require expertise.
- ❌ Lost keys with unknown duplicates – A full rekey or lock change by a pro ensures no stray keys can be used.
What’s the Cheapest Way to Change Locks on a House?
Here are your most cost-effective options:
- Use a rekeying kit if you like your current hardware
- Buy a basic lockset and install it yourself
- Replace only the cylinder, not the entire lock
That said, if you’re unsure or if the lock is critical (e.g., front door), the extra cost of a professional might be well worth the peace of mind.
Final Word
Knowing how to replace a door lock is an essential skill for any homeowner or renter, but not every situation is right for a DIY fix. Evaluate the security risk, your comfort with tools, and the complexity of the lock before deciding. In many cases, a professional locksmith can save you time — and even money — in the long run.
Need a lock replaced? We compared the best locksmiths in your area.
