The knob on the bathroom door has probably been a small daily fight for months, and you have been handling it without saying so. You can keep handling it. You can also swap the hardware in an afternoon, or you can pay someone to do it. This guide is for making that decision at the kitchen table, before anything gets ordered or booked.
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Start with the lock type, not the handle
Every interior door has one of three lock types, and the type decides how much care the swap needs. A passage set has no lock at all and is usually on hallway and closet doors. A privacy set has a push button or thumb turn inside and a small release hole outside. An entry set has a key on the outside and is usually on exterior doors. Look at the back of the handle or the inside of the door and identify which one you have.
If it is a privacy set, find the outside release hole and check whether a thin tool can reach it. A replacement set has to keep that release working. Test it on the old set before you remove anything, and test it again on the new set before you close the door for good.
Measure four things before anyone buys
Take these measurements yourself. Do not rely on the name of the handle or the photo on the box.
The backset is the distance from the door edge to the center of the round hole where the handle goes. Common backsets are two and three-eighths inches or two and three-quarters inches. Your old hole tells you which one you need, and a new set that does not match will not seat.
The bore hole is the large round hole through the door face. Check its diameter and whether the old set sits in the same hole. The door thickness matters too, because the latch has to reach the strike plate on the frame. Finally, note which way the door swings in and which side the lever points toward. A set bought for the wrong hand will be installed backward, and you will have to return it.
Decide whether you do it yourself
Swap it yourself if the door is a standard interior door, the old holes match a set you can buy with the same backset, the door is not warped, and the job is only removing the old hardware and mounting the new one. If the strike plate lines up with the new latch when you close the door, you are very likely finished.
Also check whether you rent. If you do, ask the landlord before you buy anything, and keep the old hardware so you can put it back at move-out.
Decide whether you hire it out
Hire the job if the door is exterior or fire-rated, if the new set needs a different bore than the old one, if the holes need to be drilled or chiseled into the edge of the door, or if the latch does not line up with the frame and the fix means moving the strike plate or reshaping the mortise. Hire it too if you have several doors to do and no time to test each one.
When you ask a handyman or contractor for a quote, ask these things in writing. Who supplies the hardware, and does it match the backset and the hand you measured? Does the job include testing the outside release on every privacy door? Who patches the old holes if the new set does not cover them? Does the invoice list the model numbers? Will they remove and keep or dispose of the old hardware? Compare the answers across quotes, not just the total at the bottom.
Set the rule before you start
Decide in one sitting, with one other person in the house if you can, whether this is a yes or a no. Write the date you will do it, or the date you will call. A handle job that turns into a second project is a common way for a small fix to eat a whole weekend, and you do not have a weekend to spare right now. If the answer is hire, call the list of local resources for home repair options before you call a stranger.