How to Choose a Deadbolt
Choosing the right deadbolt is one of the most consequential security decisions a homeowner, renter, or property manager can make, because the lock on an entry door is the first physical barrier between a building’s occupants and forced entry. A deadbolt that looks sturdy on a shelf can fail in the field if it lacks proper bolt throw depth, a hardened strike plate, or a pick-resistant cylinder — details that are easy to overlook without a structured selection process. This guide explains what those details mean, how to evaluate them, and when the job calls for a licensed locksmith rather than a DIY installation.
How to Choose a Deadbolt Overview
A deadbolt is a lock mechanism in which a solid metal bolt extends into the door frame when locked and can only be retracted by rotating a key or thumb turn — unlike a spring latch, which retracts automatically on contact. That manual-only operation is what makes deadbolts significantly more resistant to shimming and credit-card attacks. The bolt itself, the cylinder that drives it, and the hardware anchoring the assembly to the frame all contribute equally to overall security.
Deadbolts are available in single-cylinder, double-cylinder, and keypad or smart-lock configurations. Single-cylinder models use a key on the exterior and a thumb turn on the interior. Double-cylinder models require a key on both sides, which can improve security against glass-adjacent doors but introduces a life-safety concern during emergencies. Smart and electronic deadbolts add keypad, Bluetooth, or Wi-Fi access while retaining a physical key backup on most models.
Before selecting any specific product, measure the door’s backset — the distance from the edge of the door to the center of the bore hole — which is typically 2-3/8 inches or 2-3/4 inches in US residential construction. Confirm the cross bore diameter (usually 2-1/8 inches) and note whether the door is solid-core wood, hollow-core wood, steel, or fiberglass, since each material affects installation hardware and reinforcement requirements.
Key Factors in Deadbolt Selection
The ANSI/BHMA grading system is the most reliable starting point when comparing deadbolts. Grade 1 is the highest residential and light commercial rating, requiring the lock to withstand 250,000 open-close cycles and 10 strikes at 75 foot-pounds without failure. Grade 2 suits most residential applications and must endure 150,000 cycles and 5 strikes. Grade 3 is the minimum residential standard and is best reserved for interior or secondary doors. For an entry door on a house, apartment, or rental unit, Grade 1 is the practical standard worth reaching for.
Bolt throw — the length the bolt extends into the strike plate when locked — should be at least 1 inch on any door that faces an external threat. Many builder-grade deadbolts ship with a 3/4-inch throw, which is technically compliant with older standards but leaves less engagement with the frame. Paired with a short bolt, a weak strike plate is the most common point of failure in kick-in attacks. The strike plate should be heavy-gauge steel secured with 3-inch wood screws that reach the structural framing, not just the door casing.
The cylinder is the keyway component that must resist picking, bumping, and drilling. Look for cylinders that carry an ANSI/BHMA pick-resistance or security rating, or that explicitly feature security pins such as spool or serrated pins. Manufacturers such as Medeco lock products, Mul-T-Lock, Abloy, and ASSA Abloy produce cylinders with verified pick and bump resistance. Many standard retail deadbolts use five-pin cylinders that a skilled picker can defeat in under a minute; upgrading the cylinder while keeping a quality housing is a cost-effective option when budget is a constraint.
For apartment renters, additional considerations apply. Leases often restrict permanent modifications, so a deadbolt that replaces rather than supplements the landlord’s lock may require written permission. Portable door security bars and surface-mount deadbolts exist for temporary use, but a conversation with the landlord about upgrading to a Grade 1 deadbolt — and who bears the cost — is often the most practical path. In many jurisdictions, landlords are legally required to provide functioning deadbolts on entry doors.
Costs and Risks
Hardware costs for a quality Grade 1 single-cylinder deadbolt range from roughly $40 on the low end to $200 or more for high-security cylinders with restricted keyways. Smart deadbolts with Wi-Fi or Bluetooth connectivity typically run $100–$300 depending on brand and feature set. These prices cover the hardware only; professional installation adds to the total but also reduces the risk of errors that compromise security.
Average: $125 · Range: $75–$250 · Travel: free in service area. That range reflects a straightforward deadbolt installation on a properly prepared door with an existing bore hole. Doors that need new bore holes drilled, frames that require reinforcement, or locks that are part of a rekeying project may carry additional labor costs. A locksmith can provide an accurate estimate after assessing the door in person.
The risks of a poorly chosen or improperly installed deadbolt are concrete. A misaligned bolt that doesn’t fully engage the strike box puts mechanical stress on the cylinder and can cause the lock to feel stiff or fail to latch reliably. A cylinder installed with the set screws overtightened can crack the housing, while one installed too loosely can be extracted with pliers in a pry attack. Shimmed strike plates — installed without long screws reaching the stud — are the leading cause of successful kick-in entries on doors that visually appear well-secured.
Electronic deadbolts introduce an additional risk category: battery failure. Most smart deadbolts signal low battery well in advance and include a physical key override, but a homeowner who ignores low-battery warnings and loses the physical key simultaneously can face a lockout. Maintaining a spare key with a trusted person and testing the physical key regularly eliminates that scenario. Network-connected deadbolts also carry a cybersecurity surface area; purchasing from manufacturers that publish security update histories and provide firmware updates reduces that exposure.
When to Call a Locksmith
A locksmith should handle deadbolt selection and installation whenever the door situation involves non-standard conditions. These include doors with misaligned frames from settling or water damage, steel doors where bore holes must be cut without cracking the skin, doors with existing damage from a prior forced entry, or any application where the wrong installation could void a manufacturer’s warranty or a rental agreement. Locksmiths carry the proper tools — including hole saws, door prep jigs, and alignment gauges — that reduce the chance of boring a hole even a few millimeters off-center, which would compromise both the lock and the door’s structural integrity.
Rekeying is a separate but related service that frequently accompanies deadbolt replacement. When a tenant moves into an apartment or a homeowner purchases a used property, the keying history of the existing locks is unknown. A locksmith can rekey the new deadbolt to match existing keys, or rekey all locks in a home to a single key, which simplifies daily use without requiring full hardware replacement on every door. This service is typically faster and less expensive than replacing all hardware.
Locksmiths also provide security assessments that evaluate the full door assembly — frame, hinges, strike plate depth, and lock grade — rather than the deadbolt in isolation. A Grade 1 deadbolt on a hollow-core door with a three-quarter-inch strike plate and half-inch screws provides very little real security. A professional assessment catches those mismatches and recommends targeted fixes. Requesting a security consultation before purchasing hardware can prevent buying the wrong product for a given door configuration.
Emergency lockouts, lock failures after an attempted break-in, and situations where a key has been lost or stolen are all cases where calling a licensed locksmith is the immediate right step. Attempting to bypass or force a jammed deadbolt without proper tools can deform the bolt or damage the strike, turning a minor issue into a door replacement. A mobile locksmith can typically reach a residential location within 30–60 minutes and has the tools to open the lock non-destructively in the majority of cases.
Recommended Next Steps
Start by auditing the current door hardware. Note the ANSI grade of any existing deadbolts — this is usually printed on the packaging if the lock was recently installed, or can be identified by a locksmith on-site. Check the strike plate screws: if they back out with a standard screwdriver after only a few turns, they are likely too short to reach the framing. Tightening them or replacing them with 3-inch screws is a low-cost immediate improvement regardless of what deadbolt is installed.
Research cylinders separately from housings. A high-quality cylinder can be ordered to fit many standard deadbolt housings, allowing an upgrade of the most attack-vulnerable component without replacing the entire lock. Confirm that the replacement cylinder uses the same keyway standard and that the set screw arrangement matches before ordering. A locksmith can source and install cylinders that are not available through retail channels, including restricted-keyway cylinders that require proof of ownership to duplicate.
For renters selecting a deadbolt for an apartment, document all communication with the landlord in writing before purchasing hardware, and retain receipts. In some cases, the landlord may agree to reimburse hardware costs in exchange for leaving the improved lock in place at the end of the tenancy. If the landlord declines any modification, a door security bar or portable brace installed at the base of the door is a non-invasive alternative that adds meaningful resistance to kick-in attacks.
Finally, consider the full keying ecosystem. A property with multiple entry doors — front, back, garage entrance — benefits from a master-keyed or keyed-alike system so that a single key operates all locks. This is a task best handled by a locksmith who can order or rekey locks to a common key code. Doing this at the time of deadbolt replacement is significantly more efficient than returning to address keying later. Keep a written record of the key code in a secure location so that future replacements can be matched without disassembling the lock.
Related from Low Rate Locksmith: Cylinder Security.
Call Low Rate Locksmith
Low Rate Locksmith provides deadbolt installation, cylinder upgrades, rekeying, and security assessments for residential and commercial properties across the US and Canada, available 24 hours a day, seven days a week. Whether the need is a straightforward deadbolt swap on a rental unit or a full door-hardware assessment on a property with multiple entry points, the team arrives with the tools and hardware to complete the work in a single visit. To schedule a service call or request an estimate, contact Low Rate Locksmith at (833) 439-8636.