Rekeying vs. Changing Locks: Which Do You Need?

Rekeying a lock means a professional adjusts the internal pin tumbler mechanism inside your existing lock cylinder so that the old key no longer works and a new key operates it instead. The hardware — the deadbolt, the knob, the strike plate, the mortise lock body — stays exactly where it is. Only the tiny pins inside the cylinder are replaced. This is why rekeying is typically faster: there is no drilling, no removal of door hardware, and no patching of the door frame. A trained locksmith can rekey most standard locks in a matter of minutes per cylinder.

Changing a lock, by contrast, means removing the existing hardware entirely and installing new lock hardware in its place. This is the right move when the lock mechanism itself is worn, damaged, or outdated — for example, a mortise lock on a pre-1980s home in the Brookside neighborhood whose internals have worn down, a door knob lock that spins freely without catching, or a deadbolt whose bolt no longer extends fully. You are paying for both labor and new parts, so the factors that shape your final quote include the lock brand and grade you choose (a Schlage B60N vs. a high-security Grade 1 deadbolt, for instance), the type of door prep already in place, and whether the existing hardware is a mortise lock format or a cylindrical bored-hole style. A1 Newark Locksmith always confirms an exact up-front price before any work begins, so there are no surprises.

Rekeying is the ideal solution in a surprisingly wide range of everyday situations. You just bought a home near the University of Delaware campus and have no idea how many copies of the key the previous owners made — rekey every cylinder and start fresh with one new key. A roommate moved out and you never got their key back — rekey the lock the same day. You gave a spare to a dog walker, a house cleaner, or a relative and the relationship has changed — rekey, don't replace. Do you need to rekey a new lock? Yes, sometimes. Brand-new construction or newly purchased homes often come with builder-grade locks that were opened and closed by contractors, real estate agents, and inspectors. Rekeying ensures you and only you hold a working key, even if the lock itself is brand new.

How do you rekey a lock? At a basic level, a locksmith uses a specialized plug follower tool to remove the lock cylinder, swaps out the driver pins and key pins to match a new key cut, and reassembles the cylinder. It is not a DIY-friendly job for most people — the pin stacks are tiny, the springs are easy to lose, and an improperly reassembled cylinder can leave you locked out of your own home. Rekeying a door lock professionally also ensures the new key cut is verified to work smoothly before the locksmith leaves. If you have multiple locks you want to operate on a single key — a front door deadbolt, a door knob lock, and a back door deadbolt, for example — a locksmith can rekey all of them to the same key pattern in a single visit, which is called a master key or keyed-alike setup.

Some situations call for new hardware, full stop. If the lock is visibly damaged — a mortise lock with a cracked case, a deadbolt whose throw is stiff or incomplete, a door knob lock that rattles or turns without latching — rekeying the cylinder does nothing to fix the mechanical problem underneath. You're essentially putting new pins in a broken engine. The same logic applies if you are upgrading security: moving from a basic builder-grade deadbolt to a high-security mortise lock with a hardened steel insert, anti-drill plates, and a reinforced strike box is a meaningful jump in protection that rekeying alone cannot deliver.

Changing locks is also the right move when the door prep doesn't match any available replacement cylinder — for instance, some older mortise lock formats in historic Newark homes use a non-standard keyway that makes finding matching pins difficult or impossible. It is also worth considering when you want smart lock features: a keypad or connected deadbolt that lets you change the code on a door lock remotely, set temporary access schedules, or receive entry alerts on your phone. Note that smart locks and combination-style locks work differently from traditional pin-tumbler locks — how you change a combination lock code on an electronic model, for example, usually involves holding a programming button and entering a master code sequence per the manufacturer's instructions, rather than any physical rekeying. A1 Newark Locksmith installs and programs a wide range of electronic and smart lock hardware, so if you're unsure which format fits your door, we're one call away at (631) 380-4138.

Not all locks are the same, and the type of lock on your door affects both the service approach and what you should tell a locksmith when you call. A mortise lock is a lock body that fits into a pocket (the 'mortise') cut into the edge of the door, common in older homes, commercial buildings, and higher-security residential installations. Mortise locks often include both a latch and a deadbolt in a single unit, and they are a specialty service that requires experience — not every locksmith is equally comfortable with mortise lock hardware. A1 Newark Locksmith's team is experienced with mortise lock installation, rekeying, and repair across residential and commercial properties throughout the Newark area.

One measurement that matters when you're replacing or sourcing parts for a mortise lock — or any door lock — is the backset. The backset is the horizontal distance from the edge of the door to the center of the keyhole or cylinder. Most residential doors have a backset of either 2-3/8 inches or 2-3/4 inches; commercial and older doors with mortise lock prep can vary. How do you measure a backset on a mortise lock? Close the door, then measure from the edge of the door (the face of the door frame side) straight across to the center of the existing keyhole. That number is your backset, and it determines which replacement hardware will fit without requiring new door prep. Getting this measurement right before ordering parts saves a trip. A door knob lock typically uses the same backset measurement process, though knob locks sit in a bored hole rather than a mortise pocket, so the hardware installation steps are different. If you're unsure, simply describe your door setup when you call and our team will walk you through it.

You may have seen self-service key copy kiosks inside grocery stores and home improvement retailers — some located inside an Acme or similar supermarket chain near you, operated by services that promise to copy any key at their kiosk. These kiosks can duplicate standard residential house keys quickly and conveniently, and they have their place for making spare copies of keys you already trust. However, a kiosk cannot rekey a lock, assess a damaged mortise lock, install new hardware, respond to a lockout, or provide the kind of ownership verification that a professional locksmith does before working on a property or vehicle. They are also unable to cut keys for high-security restricted keyways, transponder car keys, or access cards and fobs, all of which require professional equipment and programming. If your goal is to actually change who has access to your home — not just duplicate an existing key — rekeying or lock replacement by a qualified locksmith is the only real solution. A1 Newark Locksmith handles the full picture: residential rekeying and lock changes, mortise lock service, vehicle locksmith work including transponder key cutting and programming, and emergency locksmith response 24 hours a day across Newark, DE and surrounding communities.

Our team serves addresses throughout Newark — from apartments near Main Street to homes in the Scotts Mill and Nottingham Hills neighborhoods, commercial properties along Route 273, and drivers stranded in University of Delaware parking areas. Whether it's a routine rekey after a tenant change or an emergency locksmith call at 2 a.m., the response and the professionalism are the same. We are insured, and we are available every hour of every day. Call (631) 380-4138 and we'll confirm your exact price before we touch a single lock.