Your home’s first line of defense starts with your door locks. At Arch City Locksmith, we offer professional residential lock installation services throughout the St. Louis metro area. Whether you’re moving into a new house, upgrading outdated hardware, or improving your home’s security, our licensed locksmiths are ready to help.
We install high-quality locks on all types of residential doors, including front entries, garage access, side doors, and patio sliders. Each installation is tailored to your security needs and lifestyle.
New lock installation is essential for:
If your current locks are worn, sticking, loose, or easy to pick, it’s time for an upgrade.
The brand on the lock matters less than most homeowners assume. A Grade 1 deadbolt installed with short screws into a hollow door casing provides only a fraction of the protection it was designed to deliver. A mid-range Grade 2 lock, correctly fitted to a solid door with a reinforced strike plate and properly anchored into the stud framing, outperforms a premium lock that was rushed into place.
Professional installation means treating the door, the frame, and the lock as a single system. Every decision, from the backset measurement to the screw length on the strike plate, affects how that system performs under real-world conditions. The sections below cover what goes into getting each of those decisions right on a St. Charles or St. Louis area home.
The page mentions ANSI-rated deadbolts without explaining the grading system. Here is what each grade means and where it belongs in a home.
The lock types listed on this page serve different purposes. Choosing the wrong type for a door wastes money and can create gaps in your overall security setup.
Most lock failures in the first two years after installation are the result of installation errors rather than product defects. These are the most common mistakes we see when called in to correct a previous installation.
| The Mistake | What Goes Wrong | The Correct Approach |
|---|---|---|
| Wrong backset measurement | The lock faceplate does not sit flush. The bolt throw is shortened. The key cylinder sits at the wrong angle for comfortable use. | Measure backset before purchasing. Most residential doors are 2-3/8 inch or 2-3/4 inch. Many locks include both backsets but not all. |
| Short strike plate screws | The plate anchors into door casing only. A firm kick splits the casing away from the frame. The lock looks secure but provides minimal resistance. | Use 3-inch screws that reach through the casing and into the stud framing behind it. This alone significantly increases door resistance to forced entry. |
| Strike plate opening too small | The bolt tip catches on the edge of the opening rather than sliding in cleanly. Causes stiffness, incomplete bolt engagement, and premature wear on the bolt tip. | The strike opening should match the bolt dimensions with a small margin. File or chisel if needed before installing the plate. |
| Bolt and strike not aligned | The bolt extends but does not enter the strike cleanly. Common after door settling. Creates drag that wears both the bolt and the lock mechanism over time. | Test bolt alignment with the door closed before finalizing strike position. Mark the bolt contact point with lipstick or chalk and adjust accordingly. |
| Latch bore and deadbolt bore not centered | The lock body sits crooked in the door. The faceplate does not flush against the door edge. Creates binding that gets worse with temperature changes. | Use a door lock installation kit with the correct hole saw sizes and a center guide to keep both bores perfectly perpendicular to the door face. |
| Mixing brands without checking keyways | Different brands cannot be keyed alike. The homeowner ends up with separate keys for doors they expected to operate with one key. | Confirm all locks being installed share the same keyway family before purchasing. Schlage and Kwikset cannot be made to share a key. |
| No door thickness check for smart locks | Smart lock does not seat flush, leaving a gap that allows the interior component to wobble and the mounting to work loose over time. | Measure door thickness before selecting a smart lock. Standard is 1-3/4 inch. Doors outside that range need an adapter kit or a different model. |
Before any lock is selected, four measurements determine what will fit and what will not. Getting these wrong means buying the wrong lock or having to return it before the job starts.
If you are replacing an existing lock, measure the backset on the current lock before calling. If you are adding a lock to a door that has never had one, we will assess the door on site before selecting hardware. Forcing a lock into a door with incorrect prep dimensions causes the installation problems listed in the table above.
The page covers the installation process but not the frame side of the equation. The strike plate is where the bolt and latch engage the door frame. It is the component that takes the most physical stress during both normal use and forced entry attempts.
In St. Charles and most of the St. Louis metro area, builder-installed strike plates use screws that are three-quarters of an inch or one inch long. Those screws anchor into the door stop molding, which is a thin decorative trim piece, not the structural 2×4 stud framing that sits behind it.
The difference between a short-screw installation and a correctly anchored one can mean the difference between a door that holds under a kick and one that does not. What we do on every lock installation:
If you want all your exterior doors to work with a single key, the planning needs to happen before any hardware is purchased. Here is how to approach it.
Check the brand on each exterior lock. Schlage, Kwikset, Yale, and Defiant all use different keyways. Locks from different brands cannot be keyed to share a key without replacing the cylinders or the entire locks.
If you are installing multiple new locks at the same time, selecting all from the same brand and keyway family allows all of them to be keyed alike during the installation visit. This is the simplest path to a single-key home.
Not every door needs the same hardware. Map out which doors need a deadbolt, which need a keyed entry knob or lever only, and which need both. This prevents over-spending on doors that do not require it.
Most smart locks have their own cylinder that may not match the keyway of your other locks. If one door gets a smart lock, plan how that door’s physical backup key will relate to your main key. Some smart lock brands offer cylinders that can be keyed to match your existing hardware.
Many homeowners forget the interior garage-to-home door when planning a one-key setup. This door should be on the same keying plan as the exterior doors rather than operating independently on whatever lock the builder installed.
If you have a specific keying goal, describing it before the visit allows us to bring the right key blanks, rekeying kits, and hardware for all doors in a single trip rather than requiring a return visit.
The St. Louis metro area includes a wide range of housing stock that affects lock installation in specific ways. Knowing which category your home falls into helps you prepare for the visit.
A well-prepared installation visit moves reliableer and requires fewer decisions under time pressure. Here is what helps.
A lock installed correctly on day one does not require a callback, does not develop alignment issues after the first winter, and does not create security gaps that undermine the hardware you just paid for. The details covered here, from backset measurement to strike plate anchoring to keyway planning, are what separate an installation that holds up from one that causes problems within the first year.
Arch City Locksmith provides mobile residential lock installation throughout St. Charles, St. Peters, O’Fallon, Wentzville, and the wider St. Louis metro area. We bring the tools, hardware, and key blanks to your door. Most single-door installations are completed in under an hour. Multi-door jobs with a keying plan are completed in a single visit in most cases.
To schedule a lock installation or discuss your home’s specific setup before committing to hardware, contact Arch City Locksmith directly. You can also review our high-security lock installation and rekeying services if those apply to your situation alongside a new installation.
We offer a wide range of lock options based on your home’s door type, budget, and security goals:
We inspect the door, frame, and current lock setup, then recommend suitable hardware for your needs and budget.
Choose from traditional or smart locks in various finishes (bronze, nickel, black, chrome). We stock high-quality brands like:
Our team ensures compatibility with your door, hardware, and smart home devices like Alexa, Google Home, and Apple HomeKit.
We drill, fit, and secure the new lock with precision, ensuring smooth alignment and tamper resistance.
We test the lock fully and show you how to use any codes, keys, or smart functions.
Our residential lock installation services cover every entry point in your St. Louis home:
Whether you need to secure exterior doors or add privacy to interior spaces, our residential locksmith team has the expertise to install the right lock for each location.
We provide mobile residential lock installation across:
We bring all tools and products to your location—no need to visit a showroom.
Homeowners throughout the St. Louis metro area trust Arch City Locksmith for reliable, professional service. We’re a locally operated mobile locksmith with licensed and insured technicians who bring high-quality hardware and tools directly to your door. Our pricing is honest and transparent with no surprise fees, and we offer flexible scheduling, including evenings and weekends, to fit your busy life. Whether you’re a homeowner, landlord, or property manager, we’re committed to delivering exceptional residential locksmith service you can count on.
Secure your home with professional lock installation from Arch City Locksmith. Whether you need to replace outdated locks or improve your door security, we’re ready to help.
Call (314) 916-3177 to schedule a mobile service visit in St. Louis MO or surrounding cities
Hours: 8:00 AM – 10:00 PM, 7 days a week
Service Area: St. Charles, St. Peters, O’Fallon, Wentzville, and beyond
Residential High-Security Lock Installation, Residential Rekeying Services, Smart Lock Installation, Residential Lockout Services, Residential Lock Repair
Yes, some smart locks replace only the interior side of your deadbolt, preserving the exterior look. Others require full replacement. We'll help you find the right fit for your residential locksmith needs.
Most smart locks offer physical key access or battery backup systems. We'll help you choose one that maintains access during outages.
Yes, you can install multiple smart locks and control them all through a single app. We can help sync and organize your system.
Absolutely. We work with landlords and property managers throughout St. Louis to install and rekey locks between tenants, ensuring complete key control.
