St Johns Locksmith Service Team
Local locksmith team
Jun 20, 2026 11 min read
You just picked up the keys to your new home in Highland Park — maybe on Central Avenue near the Ravine, or tucked into one of the quiet streets off Elm Place — and amid the excitement of moving boxes and paint swatches, one urgent question deserves your attention before your first night in: who else has a key to your front door? Previous owners, former tenants, real estate agents, contractors, and neighbors may all have copies you know nothing about. The good news is that you have two solid options to close that security gap fast: rekeying your existing locks or replacing them entirely.
This guide walks you through exactly what each option means, how to choose the right one for your situation, and what to expect when you call a professional. Whether you are dealing with a standard door knob lock, a heavy-duty mortise lock on an older Highland Park home, or a mix of both, the right call depends on a few straightforward factors — and we will spell all of them out below.
## What Does It Mean to Rekey a Lock — and How Does It Work?
Understanding what does it mean to rekey a lock is the first step. Rekeying is the process of reconfiguring the internal pin tumblers inside a lock cylinder so that the old key no longer works and a brand-new key operates the lock instead. The lock hardware itself — the knob, lever, deadbolt, or mortise lock body — stays exactly where it is. Only the internal pin stack changes. This is done by removing the lock cylinder, disassembling it, swapping out the driver pins and key pins to match a new key cut, and reassembling everything. No drilling, no patching, no new hardware installation required.
The practical result is that every key that existed before the rekey becomes useless. Your locksmith will hand you fresh keys cut to the new combination, and you are back in control of who enters your home. For most newly purchased Highland Park homes, rekeying is the fastest and most straightforward way to secure your property without touching the existing hardware — which is particularly valuable when the locks themselves are in great shape.
## Rekeying vs. Replacing: How to Rekey a Lock or Know When to Go Further
Here is a simple decision framework. Choose rekeying when your existing locks are in good working condition, are less than seven to ten years old, and do not show signs of damage, rust, or forced-entry wear. Rekeying is also the right move when you want to consolidate multiple locks onto a single key — a process sometimes called how to rekey a lock to match existing key — so that your front door, back door, and side entry all operate with one key rather than three. A skilled locksmith can rekey each cylinder to a common key cut during a single visit, which is a real convenience in a home with several exterior doors.
Choose replacement when the lock itself is worn, when you are upgrading your security grade — for example, swapping a basic door knob lock for a high-security mortise lock — or when the existing hardware is an older, lower-grade product that a bump key or pick could defeat more easily. Mortise locks, which are recessed into the door edge and controlled by an internal mechanism, offer significantly stronger resistance than surface-mounted cylindrical locks and are a worthwhile upgrade on any primary entry door. If your Highland Park home has vintage mortise lock hardware in good condition, a rekey is almost certainly all you need; if the mortise lock body itself is loose, cracked, or corroded, replacement makes more sense. Call (847) 462-4140 and our team can walk you through the condition of what you have before you commit to anything.
## How Long Does It Take to Rekey a Lock — and What Factors Shape the Cost?
One of the most common questions new residents ask is how long does it take to rekey a lock. For a single standard deadbolt or door knob lock cylinder, a trained locksmith typically completes the rekey in ten to twenty minutes on-site. A full home with three to five exterior door cylinders usually takes under an hour total, including rekeying and cutting new keys. Mortise lock cylinders can take slightly longer depending on the brand and condition, but they are well within the scope of a single appointment.
As for cost, several factors shape the final quote: the number of cylinders being rekeyed, the type of lock (a basic knob cylinder versus a commercial-grade mortise lock cylinder, for example), the time of day you call — our 24-hour emergency locksmith availability means we respond at midnight just as readily as at noon — and the travel distance to your address within the Highland Park area. Parts needed, such as new key blanks or replacement pins for an unusual lock brand, also factor in. We confirm the exact price with you before any work begins, so there are no surprises on the invoice. That transparency matters, especially when you are already managing the expenses of a new home purchase.
## Services St Johns Locksmith Provides Highland Park Residents and Businesses
Whether you need a quick rekey, a full lock upgrade, or an after-hours emergency response, our mobile team covers a wide range of needs across Highland Park's zip code 60035 and surrounding North Shore communities. Our residential services include rekeying door lock cylinders, mortise lock installation and repair, high-security deadbolt installation, door knob lock replacement, smart lock and keypad lock installation, master key system setup, lock-out assistance with ownership verification, sliding door lock reinforcement, garage door lock service, and window lock installation. For drivers, we provide car key replacement, transponder key programming, key fob repair and replacement, ignition cylinder rekeying, and lockout assistance for all major vehicle makes.
On the commercial side, our commercial locksmith services include commercial mortise lock installation, access control system integration, push bar and panic hardware installation, file cabinet and desk lock rekeying, master key system design for multi-tenant buildings, high-security lock grading consultation, lock repair after forced entry, safe installation and combination changes, storefront door lock replacement, and after-hours emergency locksmith response for businesses. We also offer lock hardware consultations to help property managers and business owners in Highland Park choose the right security grade for each entry point — because a side employee entrance and a primary customer-facing door do not always call for the same solution. If you are a building owner asking where can I find a good locksmith for ongoing commercial needs, our team is available around the clock and services the area consistently.
## Settling Into Highland Park — Local Context and Security Tips for New Arrivals
Highland Park sits along the Lake Michigan shoreline in Lake County, Illinois, and is known for its tree-lined residential streets, the Ravinia Festival grounds, and a walkable downtown core centered on St. Johns Avenue and Central Avenue. The city's older housing stock — many homes built in the 1920s through 1950s — frequently features vintage mortise lock hardware that is elegant and repairable but often overlooked by new owners who assume they need a full replacement. In many cases, a skilled rekey of the existing mortise lock cylinder is all that stands between you and complete control of your home's security.
New residents sometimes ask whether Highland Park is a good neighborhood from a safety standpoint — and by most measures, it is a well-established, actively maintained community. That said, security awareness is worthwhile in any city, and the first 48 hours in a new home are statistically the highest-risk window for an unauthorized key to cause a problem. Our advice: do not wait. Schedule a rekeying appointment for your first or second day of occupancy, check that every exterior door has a functioning deadbolt in addition to its knob or handle lock, and consider whether any door with a mortise lock body needs a cylinder upgrade for added pick resistance. If you are moving in on a weekend evening or a holiday, that is exactly what our 24 hour emergency locksmith service exists for — call (847) 462-4140 and we will come to you.
## A Note on Illinois Locksmith Requirements and What to Look for in a Pro
Homeowners sometimes ask about what are the requirements to get a locksmith license in Illinois. Illinois does not currently have a statewide licensing requirement for locksmiths, which means the bar to entry is low and the quality of providers varies. When you are choosing someone to handle your home's security, look for a locksmith who is insured, has verifiable local experience, arrives in a marked vehicle, presents identification before beginning work, and provides a written or verbal price confirmation before touching your locks. Our team at St Johns Locksmith meets all of these standards. We are insured, trained across residential, automotive, and commercial lock systems, and we operate as a legitimate mobile locksmith business serving Highland Park and the surrounding North Shore area — not a dispatch service routing calls to unknown subcontractors.
People also ask where does a locksmith work — the answer for our team is wherever you are. We are fully mobile, meaning we come to your home, your car, or your business address with all the tools and parts needed to complete most jobs on the first visit. There is no shop you need to drop hardware off at, and no waiting for parts to be ordered. Whether the job is a routine rekey of a door knob lock or a more involved mortise lock cylinder replacement, we carry a professional inventory of pins, cylinders, key blanks, and hardware to handle it on the spot.
Frequently asked questions
How do I rekey a lock cylinder myself versus calling a professional?+
You can rekey a lock cylinder yourself if you purchase a rekeying kit matched to your specific lock brand — kits are available for common brands like Schlage and Kwikset and include replacement pins, a follow tool, and key gauges. The process involves removing the lock from the door, using the follow tool to remove the plug, swapping the key pins according to the depth cuts on your new key, and reassembling the cylinder. It takes patience and the right kit, and mistakes can leave you with a cylinder that binds or fails to turn. For a newly purchased home where you are rekeying multiple cylinders — especially mortise lock cylinders, which have more components and tighter tolerances — a trained locksmith completes the work faster, guarantees the result, and can identify any underlying hardware issues while on-site. If you would like a professional to handle it, call (847) 462-4140 and we can schedule a same-day visit.
How long does it take to rekey a lock, and do I need to be home?+
A single standard deadbolt or door knob lock cylinder typically takes ten to twenty minutes to rekey on-site. A full home with four or five exterior cylinders, including a mortise lock or two, usually takes under an hour from start to finish. Yes, someone needs to be present to verify ownership and grant access to the property — we ask for a photo ID and proof of address or ownership before beginning any residential rekey. This is a standard verification step that any reputable locksmith should follow, and it protects you as much as it protects us.
What factors affect how much a rekey or lock replacement costs?+
Several variables determine the final price for any rekeying or lock replacement job: the number of cylinders being serviced, the type of lock involved (a basic door knob lock cylinder is simpler than a commercial mortise lock cylinder), the time of day you call — evening, overnight, and holiday calls involve different logistics than a standard weekday appointment — the travel distance to your location in or around Highland Park, and whether any parts such as new cylinders, key blanks, or replacement hardware are needed. We confirm an exact up-front price before any work begins, so you know the full cost before we touch a single lock. There are no hidden fees added after the job is done.
Should I rekey or fully replace the locks on a home I just purchased in Highland Park?+
For most newly purchased homes in Highland Park, rekeying is the right first move if the existing locks are in sound working condition. It secures your home immediately by voiding every previously cut key, and it is faster than a full replacement. The case for replacement is stronger when the hardware is visibly worn or damaged, when you want to upgrade the security grade — for example, adding a mortise lock where only a knob lock exists — or when the existing locks are low-grade products that do not meet your security expectations. During a rekey visit, our team will assess each lock and let you know honestly whether any of them are candidates for replacement rather than rekeying, so you can make an informed decision with no pressure.