Installing a smart lock is one of the few home upgrades you can genuinely do in an afternoon, and one of the easiest to get wrong in a way you do not notice until winter. We install these on Seattle doors constantly, from new builds in South Lake Union to 1920s craftsman homes in Wallingford, and the difference between a clean job and a frustrating one almost always comes down to two things: whether the lock fits the door, and whether the bolt lines up with the strike. This is the honest, step-by-step version, including the parts the box instructions skip.
Before you start: will the lock even fit your door?
Most failed smart lock installs are decided before the screwdriver comes out. Smart deadbolts are built to standard door prep, but a lot of older Seattle homes were not built to the standard the locks assume. Spend five minutes measuring and you will know whether this is a quick swap or a job that needs reaming and chiseling first.
The three measurements that matter
Pull the spec sheet for the lock you are considering and check your door against three numbers. The backset is the distance from the edge of the door to the center of the bore hole, and it is almost always either 2 3/8 inch or 2 3/4 inch. The bore hole is the big round hole the lock body sits in, usually 2 1/8 inch across. The door thickness needs to fall in the lock’s range, typically 1 3/8 to 1 3/4 inch. There is also a cross bore on the door edge, around 1 inch, where the bolt slides through. Almost every smart deadbolt sold today handles both common backsets with an adjustable latch, but you still want to confirm before you buy.
What trips up older Seattle homes
Doors in the Central Area, Capitol Hill, and parts of Ballard often have non-standard prep: a thicker slab, a worn or oversized bore from decades of hardware changes, or a backset that was hand-bored and never quite square. A budget smart lock will not seat cleanly into a sloppy bore, and the result is a lock that wobbles or a bolt that drags. If your existing deadbolt already works smoothly and looks like standard prep, you are in good shape. If it has always been finicky, the door is the project, not the lock. Our guide on choosing the right locks for your Seattle home covers how to match hardware to an older door.
Pick the right type of smart lock for your situation
There are two physical install styles, and which one you pick changes the whole job. This is also the single most important choice for renters.
Full-replacement smart deadbolts
These replace your entire deadbolt, inside and out. You remove the old lock and the new one goes in its place, with a keypad or touchscreen outside and a motorized thumb-turn inside. The Schlage Encode and Encode Plus (roughly $200 to $300 for the hardware) are the popular Wi-Fi examples, and Yale Assure and Schlage Sense sit in a similar $150 to $300 band. You get the full feature set, but the door’s keyed cylinder changes, which matters if you rent.
Retrofit smart locks
A retrofit lock, the August Wi-Fi Smart Lock being the best-known example (around $150 to $230), mounts only on the inside over your existing deadbolt’s thumb-turn. The outside of your door does not change at all, and your original key still works. This is the most renter-friendly option in Seattle, because nothing is modified and you can pop it off when you move out. The tradeoff is no outside keypad on most retrofit models, so you control it by phone, auto-unlock, or the original key.
| Install style | What changes | Best for | Example | Approx. hardware |
|---|---|---|---|---|
| Full-replacement deadbolt | Whole lock, inside and out | Owners who want a keypad and full features | Schlage Encode, Yale Assure, Schlage Sense | $150 – $300 |
| Retrofit (interior only) | Inside thumb-turn only; key unchanged | Renters, anyone keeping the existing key | August Wi-Fi Smart Lock | $150 – $230 |
Prices above are approximate market ranges for the hardware only and move with retailer and finish. Professional installation is separate.
Tools and what comes in the box
You need less than you might think. A Phillips screwdriver does most of the work. Keep a tape measure handy for the checks above, plus a pencil and a fresh set of the batteries the lock specifies (usually AA). For an older door that needs fitting, a 1-inch spade or hole-saw bit, a chisel, and a drill help, but do not start cutting unless the lock genuinely will not seat. The box should include the exterior and interior assemblies, the adjustable latch (bolt), a strike plate, a mounting plate, screws, and on smart models the batteries. Lay it all out and read which way the latch faces before you begin.
Step by step: removing the old deadbolt
This part is the same for almost every standard door. Work from the inside.
- Remove the interior assembly. Unscrew the two screws on the inside plate (the side with the thumb-turn) and pull the interior half off the door.
- Pull the exterior half. With the inside off, the outside cylinder or keypad lifts away. Set it aside.
- Take out the latch. Open the door and remove the two screws holding the latch faceplate on the door edge. Slide the old bolt straight out of the cross bore.
- Remove the strike plate. Unscrew the strike from the door frame. You will replace it, and this is where the most important upgrade happens, covered below.
If you are installing a retrofit lock like the August instead, you skip almost all of this. You only remove the interior thumb-turn, leave the exterior cylinder and the bolt exactly where they are, and the smart unit mounts onto the adapter in place of the old thumb-turn.
Step by step: installing the smart lock
With the old hardware out, the new lock goes in the same prep. Take it slowly and do not fully tighten anything until the bolt moves freely.
- Set the new latch. Adjust the latch to your backset if it is the universal type, slide it into the cross bore with the bolt facing the frame, and screw the faceplate to the door edge. The angled face of a deadbolt latch usually does not apply, but make sure the keyway orientation marking faces out.
- Mount the exterior assembly. From outside, feed the cable and the tailpiece or torque blade through the bore and the latch, holding the keypad straight.
- Attach the mounting plate. Inside, place the mounting plate over the posts and snug the screws, keeping the plate level. Tuck any cable so it is not pinched.
- Connect and seat the interior unit. Plug in the connector if your model has one, then set the interior smart assembly onto the plate and tighten its screws evenly. Even pressure keeps the lock from binding.
- Install the batteries and test by hand. Add the batteries, then throw the bolt several times with the door open. It should extend and retract smoothly with no grinding. If it drags, loosen the mounting screws slightly and re-square the lock.
For a retrofit lock, the install is mostly steps three through five: attach the adapter over the existing thumb-turn, clip the smart unit on, add batteries, and test. It is genuinely a 15-minute job on most doors.
App setup, Wi-Fi, and hub pairing
The hardware is half the job. The other half is getting the lock onto your network so the smart features work, and this is where people lose patience. Download the brand’s app first, create an account, and follow the in-app pairing, which usually means scanning a code on the lock or holding it near your phone over Bluetooth.
The Wi-Fi step is where Seattle homes hit a snag. Most smart locks, including the Schlage Encode and August, connect to 2.4 GHz Wi-Fi only, not 5 GHz. If your router broadcasts both bands under one name, the app may try to join the 5 GHz band and fail. Stand near your router during setup, and if it will not connect, temporarily split your bands or create a dedicated 2.4 GHz network. Some locks (older August units, Schlage Sense) need a separate bridge or your phone’s Bluetooth and a HomeKit or Alexa hub to get remote access, so confirm whether your model has Wi-Fi built in or needs a hub before you expect to control it from work downtown. Once it is online, set your codes, name the lock, and test a remote lock and unlock from your phone before you call it done.
The strike plate: the step almost everyone skips
This is the part that has nothing to do with how smart your lock is, and everything to do with whether it actually protects you. The strike plate is the metal piece on the door frame that the bolt lands in, and on most factory doors it is held by two short screws biting into thin trim. Under a hard kick the frame splits and the bolt goes with it. The lock never failed; the wood did.
When you put the new strike on, swap the factory screws for 3-inch screws that reach past the trim into the wall framing, and add a reinforced strike box if the lock came with one or if you buy one separately. It is the cheapest, most effective security upgrade on any door, smart or not. This matters in Seattle: Seattle recorded 7,915 burglaries over the trailing twelve months, with the highest counts in Queen Anne (640), Capitol Hill (632), South Lake Union and Cascade (494), and south Ballard (428). A smart lock that alerts your phone is useful, but a bolt seated into solid framing is what stops the kick in the first place. Source: Seattle Police Department Crime Data, City of Seattle Open Data portal (data.seattle.gov), analyzed by WA Lock & Key. Trailing twelve months, June 2025 to June 2026.
Common problems and how to fix them
If something feels off after install, it is almost always one of these.
The bolt is stiff or the motor jams
Nine times out of ten this is alignment. With the door open, the bolt moves freely; with the door closed, it drags or the motor struggles and the lock beeps an error. That means the bolt is not lined up with the strike hole. Mark where the bolt hits, then enlarge or re-drill the strike hole slightly so the bolt drops in clean. Many smart locks run a calibration cycle in the app after install, and it will fail if the alignment is off, so fix the mechanics first. Seattle’s damp seasons swell wood doors, so a lock that worked fine in August can bind in January; that is the door moving, not the lock failing.
The door sags or the gap has shifted
Older homes settle. If the strike no longer lines up at all, the hinges may have loosened or the door dropped. Tightening the top hinge screws (or replacing one with a long screw into the framing) often lifts the door back into line so the bolt seats again.
Battery drains fast
A smart lock that eats batteries in weeks usually has a motor fighting a misaligned bolt every cycle, the same root cause as a stiff bolt. Fix the alignment and battery life jumps back to the normal 6 to 12 months. Use good alkaline batteries, not the bargain pack, and never mix old and new.
Wi-Fi keeps dropping
If the lock pairs but keeps going offline, it is usually a weak 2.4 GHz signal at the door or a band-steering router pushing it to 5 GHz. A mesh node or extender near the entry, or a split 2.4 GHz network, usually settles it.
Should you DIY or call a locksmith?
A retrofit lock on a working deadbolt, or a full-replacement deadbolt on a clean modern door, is a fair weekend project if you are comfortable with a screwdriver and patient with an app. Where it goes sideways is the older Seattle door: an odd backset, a worn bore, a strike that has not lined up in years, or a slab that swelled. A lock that binds or does not fully throw is worse than the one you replaced, because it feels secure when it is not. A locksmith carries the bits to ream a bore, chisel a strike, reinforce the frame, and will pair the lock so the codes, Wi-Fi, and app all work before leaving. For where this fits among rekeys, lockouts, and other work, our guide to locksmith costs in Seattle lays out the full picture.
Frequently asked questions
How long does it take to install a smart lock?
On a clean, standard door prep, a deadbolt-replacement smart lock like a Schlage Encode usually takes 20 to 40 minutes, and a retrofit model like the August that mounts over your existing deadbolt can take under 15. App and Wi-Fi setup adds another 10 to 20 minutes. Older Seattle doors with worn bores, odd backsets, or a strike that no longer lines up take longer, since you have to fix the fit before the lock will seat right.
How do I know if a smart lock will fit my door?
Check three measurements against the lock’s spec sheet: the backset (2 3/8 inch or 2 3/4 inch from the door edge to the center of the bore), the bore hole diameter (usually 2 1/8 inch), and the door thickness (most locks fit 1 3/8 to 1 3/4 inch). Also confirm the cross bore on the edge is about 1 inch. If your door already has a standard deadbolt, most smart deadbolts will drop into the same prep.
Can I install a smart lock in a Seattle rental?
Often yes, but get your landlord’s written approval first. A retrofit lock like the August Wi-Fi Smart Lock mounts over the inside of your existing deadbolt and leaves the keyed cylinder in place, so the door is unchanged and you can remove it when you move out. Keep the original interior thumb-turn and confirm who holds a backup key or master code.
Do smart locks still work if the Wi-Fi or power goes out?
Yes. Smart locks run on their own batteries, not your home’s power, so a Seattle windstorm outage will not lock you out. If the Wi-Fi drops, the keypad and the key still work locally; you just lose remote app control until the connection returns. Most keypad models also accept a physical key or a 9-volt jump terminal as backup, and battery life typically runs 6 to 12 months.
Want it installed right the first time? Call WA Lock & Key
WA Lock & Key is a Seattle-based 24/7 mobile locksmith. We install smart locks of every type for homeowners, renters, and property managers, match the hardware to your door, square the bolt to the strike, reinforce the frame, and set up the app and Wi-Fi so everything works before we leave. If your door has always been a little stubborn, or you just want it done once and done right, call us and we will come to you anywhere in the Seattle metro.
