Smart Lock Installation: Types, Costs and How to Pick One

Quick answer: Smart lock installation is a straightforward project for most homes: a retrofit unit that swaps onto your existing deadbolt takes about 15 to 30 minutes with a screwdriver, while a full replacement lock takes 30 to 60 minutes and may involve drilling. Expect to pay roughly $100 to $300 for the lock itself, plus an estimated $75 to $200 if you hire a locksmith or handyman. The right choice depends on your door, your deadbolt and how you want to unlock it.

A smart lock replaces or upgrades the part of your door that matters most: the deadbolt. Before you buy, it helps to know which style fits your door, which unlock method you will actually use and what a realistic installed price looks like. This guide walks through all of it in plain terms.

If you would rather have a pro handle the work, you can request a free consultation using the form on this page and compare options from vetted providers.

Retrofit vs Full Replacement: Which Smart Lock Installation Is Right for You?

This is the first decision, and it shapes cost, effort and appearance.

Retrofit smart locks

A retrofit lock replaces only the interior thumb-turn. Your exterior keyed deadbolt stays exactly as it is, so the outside of your door looks unchanged.

• Install time: typically 15 to 30 minutes.
• Tools: usually just a screwdriver.
• Best for: renters (it is easy to reverse), people who want to keep their existing key, and quick upgrades.
• Downside: no exterior keypad on most models, and your security is only as good as the deadbolt already on the door.

Full replacement smart locks

These replace the whole deadbolt, inside and out. You get a new exterior with a keypad, fingerprint reader or keyed cylinder.

• Install time: typically 30 to 60 minutes.
• Tools: screwdriver, and occasionally a drill or hole saw if the door is not pre-bored.
• Best for: homeowners who want keyless entry from outside and a fresh, upgraded deadbolt.
• Downside: higher price and a bit more fitting work.

Keypad vs App vs Fingerprint: Choosing How You Unlock

Most smart locks combine several methods. Here is how each one behaves day to day.

• Keypad: Enter a code on the door. No phone required, easy to give guests or cleaners their own codes, and easy to delete later. Codes can be watched over a shoulder, so pick a model with a touchscreen that resists fingerprint smudges.
• App and Bluetooth or Wi-Fi: Unlock from your phone, check lock status and get notifications. Convenient, but it depends on your phone battery and, for remote control, a Wi-Fi connection or hub.
• Fingerprint: Fast and keyless, ideal for households where kids lose keys and forget codes. Sensors can struggle with wet, dirty or worn fingers, so most models keep a backup code or key.
• Voice and auto-unlock: Works with common smart home assistants, but treat voice unlock with caution and require a PIN for safety.

For most families, a keypad plus app is the sweet spot. Add fingerprint if you want the fastest entry. Whatever you choose, make sure there is a physical key or backup power option for the day the batteries die.

The best smart lock is the one that still lets you in when your phone, Wi-Fi and batteries all fail.

Deadbolt Compatibility: Measure Before You Buy

Most U.S. residential doors are built to standard dimensions, but a mismatch is the single most common reason an install goes sideways. Check these before you add anything to your cart.

1. Door thickness: Most locks fit doors roughly 1-3/8 to 2 inches thick. Thicker or thinner doors may need an adapter or a different model.
2. Bore hole size: The large hole through the face of the door is usually 2-1/8 inches. The smaller hole in the door edge is usually 1 inch.
3. Backset: The distance from the door edge to the center of the bore hole is either 2-3/8 or 2-3/4 inches. Many locks adjust to both, but confirm it.
4. Single vs double cylinder: If your deadbolt has a key on both sides (common on doors with glass), a retrofit thumb-turn replacement will not work the same way.
5. Door and frame condition: A sagging door or misaligned strike plate will cause jams no matter how good the lock is. Fix alignment first.

Retrofit models are typically designed for a specific deadbolt brand or style, so verify your existing lock is on the compatibility list. Sliding doors, pocket doors and unusual commercial-style hardware often need a different solution; a guide on how to secure sliding glass doors is a useful companion for those entry points.

Battery Life, Backup Power and Connectivity

Smart locks run on batteries, so planning for them is part of a good install.

• Typical life: Four AA batteries commonly last about 6 to 12 months, depending on how often you use the lock and how much Wi-Fi it uses. Bluetooth-only models usually last longer than Wi-Fi models.
• Low-battery alerts: Most locks warn you by beep, light or app notification well before they die. Do not ignore the first warning.
• Emergency backup: Many locks let you hold a 9-volt battery to external contacts for a temporary boost, or include a hidden key cylinder.
• Hubs and bridges: Wi-Fi-enabled locks connect directly; Z-Wave or Zigbee locks usually need a hub. If you already run a monitored setup, see our guide to home security system installation to check which locks integrate with it.

Power matters outside the lock too. If you rely on Wi-Fi for remote access, an outage can cut you off, which is worth knowing as part of a broader power outage preparedness checklist.

Security Grades and What They Mean

You do not need to be a locksmith to read a lock’s security rating. In the U.S., look for the ANSI/BHMA grade on the box or spec sheet.

• Grade 1: The highest residential and light-commercial rating, built to withstand the most abuse.
• Grade 2: A solid mid-level rating, common on quality residential locks.
• Grade 3: The baseline residential rating. Fine for many homes, but weaker against forced entry.

The ANSI/BHMA standards are published by the Builders Hardware Manufacturers Association; their official site explains how grades are tested. In general, a higher grade means more resistance to kicking, drilling and picking, and it applies to the physical hardware, not the electronics.

Two practical notes: a Grade 1 deadbolt in a weak door frame is still vulnerable, so reinforce the strike plate with long screws that reach the wall stud. And keep the lock’s firmware updated, since app-connected models receive security patches like any other connected device. Our planned article on whether smart locks are safe will go deeper on hacking and break-in risks.

A top-grade lock bolted into a flimsy door frame is only as strong as the screws holding it in.

Smart Lock Installation Cost: DIY vs Professional

All figures below are rough estimates and vary by brand, region and door condition.

• Retrofit smart lock (hardware): about $100 to $200.
• Full replacement smart lock (hardware): about $150 to $350, with fingerprint and premium models at the higher end.
• Professional installation: roughly $75 to $200 per door from a locksmith or handyman, more if the door needs drilling or repair.
• Hub or bridge (if required): about $30 to $100.
• Door or frame repair: varies widely; get a quote if the door is warped or damaged.

DIY is realistic for most retrofit and many full-replacement installs. Hire a pro if your door is not pre-drilled, if you have multiple entry doors to match or if you want the lock tied into a larger system. A smart lock also pairs well with cameras, so see where to put them in our camera placement guide, and compare costs in security camera installation cost.

Smart locks can also support insurance savings when part of a broader setup; read whether security systems lower homeowners insurance to see what discounts typically look like.

A Simple Installation Checklist

1. Measure door thickness, bore hole and backset.
2. Confirm retrofit compatibility or choose a full replacement.
3. Check the ANSI/BHMA grade.
4. Install fresh batteries and test the lock with the door open before closing it.
5. Reinforce the strike plate with 3-inch screws.
6. Set up user codes and delete the factory default.
7. Test every unlock method, including the backup key.

Want help choosing or installing the right lock for your doors? Request a free consultation with the form on this page and get matched with a vetted provider.

Frequently Asked Questions

Can I install a smart lock myself?

Yes, in most cases. Retrofit models need only a screwdriver, and many full replacements fit standard pre-drilled doors. Hire a locksmith if your door needs drilling or has an unusual bore or backset.

Do smart locks work if the power or Wi-Fi goes out?

The lock itself runs on batteries, so a power outage does not stop it. Keypad and physical key access keep working without Wi-Fi, though remote app control and notifications will not.

How long do smart lock batteries last?

Commonly around 6 to 12 months for a set of four AA batteries, depending on usage and connectivity. Heavy use and Wi-Fi models drain them faster, so heed low-battery alerts.

Will a smart lock fit my existing deadbolt?

Often yes, but check door thickness, bore hole size, backset and whether your deadbolt is single or double cylinder. Retrofit locks list the deadbolts they support, so confirm yours before purchasing.