Best Key Lock Box – 3 Picks for Spare Keys and Guest Codes

Best key lock box at a glance

The best key lock box for most homes is a simple, battery-free spare key box; step up to a smart lock box only when you share keys with people you want to cut off later. A key lock box is a small locked container, opened by a code instead of a key, that holds house keys outside the door they open.

Here are our three picks in one line each:

• Best for a spare key: Kidde AccessPoint 001166 KeySafe, push-button code, no batteries, holds up to 3 keys.
• Best classic doorknob box: Master Lock 5400D Portable Lock Box, set-your-own 4-digit dial, sliding weather cover.
• Best smart lock box: igloohome Smart Keybox 3, one-time and time-limited PINs from an app, IP66, shackle or wall mount.

The table below compares the three boxes on the details that decide daily use: lock type, power, mounting, weather sealing and what fits inside.

Which one to choose in 10 seconds: one spare key for family, the Kidde; a full key ring and a dial code you set yourself, the Master Lock; codes that expire for cleaners or an Airbnb host’s guests, the igloohome.

The best key lock boxes, reviewed

Each key lock box below comes from the products that several top-ranking guides recommend, and every spec comes from the maker’s own pages. Owner notes come from retailer and maker review pages plus Reddit threads we read; we did not handle these boxes ourselves.

Kidde AccessPoint 001166 KeySafe: Best for a spare key

3.0Best Safe Spec Score out of 5

• Security (lock and build)5/10
• Access (speed and ease)7/10
• Capacity5/10
• Value8/10

No burglary rating and a button-set code owners say opens in any order keep security modest; no batteries and a changeable code help access, but the 3-key space is tight and setup confuses some owners.

How we score

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What we like

• Hangs on a doorknob, fence, railing or pipe with no tools
• Code can be changed as often as needed, with no batteries
• Compact 3-key size, from the KeySafe line that Wirecutter, Swiftlane, ButterflyMX and Bob Vila all recommend

What we don't like

• Owners report the code is confusing to set (screw slots on the back) and that you must re-enter it to relock
• Owners report the same buttons open it in any order, so the effective code space is small

What owners and reviewers say review themes from 8 owner reviews, plus 7 posts and reviews we read

Praised for

• Compact and sturdy feel for the money
• Code is changeable and works for a spare key once programmed

Common complaints

• Instructions and programming (screw slots on the back) confuse many first-time owners
• Must re-enter the combination to relock, and the code opens in any button order

Read on: Shop Kidde: AccessPoint 001166 KeySafe Original 3-Key Portable (owner reviews) (8 reviews)

Who it's for: A homeowner or renter who wants a low-cost spare key for family, a pet sitter or a cleaner; the push-button code is a set of buttons rather than an ordered PIN, so keep it to low-risk spare-key use, not valuables.

For one spare house key that a parent or pet sitter can reach, this little push-button box is where we would start. Wirecutter names a box from the Kidde AccessPoint KeySafe line as its lockbox pick; we could not confirm which exact model, but Swiftlane links this portable 001166 version, and ButterflyMX and Bob Vila also recommend the line. Kidde lists it for up to 3 standard house keys, with an exterior of 4.44 x 5.75 x 1.8 in including the shackle.

The shackle hangs on a doorknob, fence, railing or pipe with no tools. Inside the rubber cover is powder-coated metal, and Kidde says it will never rust and resists water, humidity and UV, though no IP rating is published. There are no batteries to die.

Owners on the Shop Kidde page like the compact, sturdy feel, and one had no trouble programming it. The recurring complaint is setup: several found the screw-slot programming on the back confusing, and owners note you must re-enter the code to relock. Owners also report the buttons open in any order, so treat it as a low-risk spare key box, not storage for anything valuable.

Master Lock 5400D Portable Lock Box: Best classic doorknob box

3.5Best Safe Spec Score out of 5

• Security (lock and build)6/10
• Access (speed and ease)8/10
• Capacity7/10
• Value8/10

A reliable, battery-free dial that is quick to use and easy to reset, but a few owners report thin casing and weather wear, so security is middling; large cavity for a key ring and good value.

How we score

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What we like

• Set-your-own 4-digit combination and no batteries
• Sliding weather cover protects the dials; large cavity avoids jamming with several keys
• Portable shackle fits behind most doorknobs and is easy to take when you move

What we don't like

• Some owners report the casing can be smashed open and that it is not fully weatherproof long term

What owners and reviewers say review themes from 28 owner reviews, plus 8 posts and reviews we read

Praised for

• Easy to open and easy to change to a code the family remembers
• Sturdy metal feel and generous key space for a spare key or house sitter

Common complaints

• Thin casing that a burglar smashed open (owner report)
• Not waterproof long term and the vinyl coating can go tacky

Read on: Master Lock: 5400D product page owner reviews (28 reviews)

Who it's for: A homeowner or renter who wants a portable, no-battery spare key for family or a house sitter that can come along in a move; owners report thin casing, so keep it to a spare key, not master keys.

This is the over-the-knob box many people picture when they hear realtor lockbox. The Master Lock 5400D uses a set-your-own combination on four dials, with a sliding weather cover over them and a vinyl-coated shackle that will not scratch the doorknob. Master Lock lists it at 6-1/4 x 3-1/4 x 1-1/2 in and 1.16 lb, and calls the interior a large cavity for multiple keys.

That cavity is the quiet advantage. One owner on Master Lock’s own review page fit about five house keys plus a few access cards, which beats the Kidde for a full key ring. It is portable only; the wall-mount sibling is the 5401D.

Owners praise how easy it is to change to a code the family remembers. The complaints are sharper than for the Kidde: one owner says a burglar breached the thin casing, others say it is weather resistant rather than weatherproof over years. Keep it to a spare key, never master keys.

igloohome Smart Keybox 3: Best smart lock box

3.4Best Safe Spec Score out of 5

• Security (lock and build)7/10
• Access (speed and ease)7/10
• Capacity8/10
• Value5/10

Hardened-steel shackle, alloy body, keypad lockout and expiring PINs help security but there is no independent burglary rating; access is quick once set up but depends on batteries and an app, and it costs more than a mechanical box.

How we score

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What we like

• One-time, duration, recurring and permanent PIN codes from an app, working offline
• IP66 rated, zinc and aluminum alloy body with a hardened-steel shackle
• Roomy interior (4.3 x 3.4 x 1.1 in) with a USB-C jump-start if the batteries die

What we don't like

• Real-time activity logs need the separate Bridge; without it, owners can only check unlocks within Bluetooth range
• Runs on 4 AAA batteries and needs an app, so it adds upkeep that a mechanical box does not

What owners and reviewers say review themes from 173 owner reviews, plus 13 posts and reviews we read

Praised for

• Sturdy build and roomy interior that holds several keys and a fob
• Remote and one-time PIN codes make contractor and guest access easy

Common complaints

• Higher cost for what is a key box
• Wi-Fi Bridge can drop offline until set to a dedicated 2.4 GHz network; one owner reported batteries draining fast and got a replacement

Read on: Walmart: customer reviews for igloohome Smart Keybox 3 (8 reviews) · igloohome US store: Smart Keybox 3 customer reviews and technical specs (165 reviews)

Who it's for: An owner or host who shares keys with guests and contractors and wants expiring PINs without Wi-Fi; it needs batteries and a phone, and real-time logs need the separate Bridge.

If you hand keys to a cleaner on Tuesdays, a contractor for a week and Airbnb guests on weekends, a smart lock box earns its extra upkeep. The igloohome Smart Keybox 3 makes PINs in an app (permanent, duration, recurring or one-time code) and those PINs work offline, so the box needs no Wi-Fi. It talks to your phone over Bluetooth and syncs with Airbnb.

Build is the most serious here: a zinc alloy and aluminum alloy body, a hardened steel shackle, an IP66 seal and an operating range of -4°F to 122°F, per igloohome. The keypad locks out after repeated wrong attempts, a basic tamper response. You get two shackle sizes or screw holes for a wall mount, and the 4.3 x 3.4 x 1.1 in interior takes keys, access cards and a car key fob.

Owners on igloohome’s store and at Walmart like the sturdy build and the one-time codes for contractors. The complaints are cost, and the audit trail: without the separate Bridge, one owner notes you can only check unlocks within Bluetooth range. Another Walmart owner had the Bridge drop offline until it got a dedicated 2.4 GHz network.

How we chose these key lock boxes

We picked boxes that several top-ranking guides recommend and that sell as one clear Amazon US listing, then checked every spec against the maker. That left a push-button box, a dial box and a smart box, one of each lock type.

What we compared: lock type and backup entry, interior size against a real key ring, mounting, published weather ratings, and owner complaints from maker and retailer review pages and Reddit. Our scoring rubric is on how we score.

What we could not verify: none of the three publishes a steel gauge, bolt work or an independent burglary rating, so we score security on lock design and build only. Abroad, buyers can look for a UK key safe (Sold Secure, LPS 1175) certification; US boxes rarely carry a common equivalent, and realtor-grade boxes from Supra or larger multi-key boxes from Kingsley sit outside this short list.

From our notes: When we lined up the three spec sheets, the number that stood out was not a code length. It was the weather line. Only igloohome publishes a rating, IP66, plus an operating range down to -4°F. Kidde promises the box will never rust, and Master Lock lists its dial box as weather resistant with a cover, but neither gives a test standard. Then we read owner threads about latches that stiffen with rain, dirt and age, and the gap made sense. A published rating is the one weather claim a buyer can actually check.

How to choose a key lock box

Choose a key lock box by matching the lock type to who needs the code, then the mounting to where it will live, then the interior to what you store. Everything else is detail. Our safe buying checklist walks through the same questions for bigger safes.

Push-button, dial or smart lock

A push-button lock, like the Kidde’s, has no batteries and a resettable code, but owners report the order of buttons does not matter. A set-your-own combination on dials, like the Master Lock’s, is ordered, so the sequence counts. A smart lock box adds expiring codes and an audit trail at the cost of batteries and an app.

Shackle or wall mount

A shackle hangs on a doorknob, gate or railing and leaves with you when you move, which suits renters. A wall-mount lock box screws into brick, concrete or a stud and is far harder to carry off. Only the igloohome offers both.

Capacity and key size

Count what goes inside before you buy. Kidde lists 3 house keys, one owner fit about five in the Master Lock, and igloohome names a car key fob among what fits. A bulky fob is the usual surprise.

Weather resistance

Weather resistant on a box made for a porch is a maker’s claim unless it names a standard. The igloohome’s IP66 rating is the only published one here.

Resettable code and who knows it

Every pick has a resettable code. The habit that matters is changing it after each sitter, cleaner or contractor, and writing the current code somewhere safe away from the box.

Where to put a key lock box and how to mount it

Put a key lock box out of street view and away from the main door, and anchor it as firmly as the wall allows. The box is only as strong as whatever holds it up.

Placement out of street view

Pick a side gate, a back railing or a spot behind a planter, where your helper can reach it but a passerby will not notice it. Avoid hanging it on the front doorknob it unlocks.

Anchoring a wall-mount box

Here is the order we would follow for a screw-mounted box like the igloohome on its own wall:

1. Choose solid masonry or a wall stud, not siding or trim.
2. Use a masonry anchor or long wood screws rated for the material.
3. Where the design allows, keep the screw heads inside the closed box, not exposed on the face.
4. Re-check the screws each season.

Setting and changing the code

Set the code before mounting, open and close it several times with the door open, then write the code down somewhere secure. On the Kidde, budget extra time for the screw-slot setup owners find confusing.

Problems owners run into, and the fix

Most key lock box problems come from mounting, visibility and code habits, not the box itself, and each has a simple fix. These are the five complaints that keep coming up in owner threads.

The box gets pried off or stolen

This is a recurring worry in r/homesecurity and r/AskUK threads, and it does happen: one r/melbourne post reported “two key lockboxes that were bolted into the external walls of our apartment building stolen in the middle of the night” (r/melbourne). The fix is fasteners and placement: anchor into masonry or a stud, hide the screws inside the closed box, and keep it out of sight. A shackle box is easiest to lift with whatever it hangs on, so a renter should pick a sturdy rail out of view.

A visible box tells a thief a key is inside

Homeowners in r/homeowners and r/homesecurity raise this often. One reply sums it up: “the lockbox is more secure but still makes it obvious that there is a key inside” (r/homeowners). Another notes “your cheap lockbox should be fine 99% of the time” against casual thieves (r/homesecurity). So a box still beats a hide a key rock, provided it sits out of view and the code changes after each visitor.

Forgot the code or someone changed it

A resettable code is easy to change by accident. In one r/DIYUK thread, an owner wrote: “My partner managed to take the spare key out, close the box and somehow change the combination” (r/DIYUK). For your own box, the safe path is the maker’s support: ask Kidde or Master Lock what proof of ownership they need to help with a reset. The igloohome avoids most of this because codes live in your app account. Write every code change down, and tell the household before you change it.

Stiff or jammed latch

Owners report covers and tabs that stick, mostly on boxes left out in the rain and sun. One Kidde owner on the Shop Kidde page says the clear tab often sticks on a box kept outside in the weather, and Master Lock’s 5400D owners note the vinyl coating can go tacky over the years. Prevention is a sealed box such as the IP66 igloohome, a spot under an awning or behind a storm door, and a yearly check that the latch moves freely. If your own box still sticks with the right code, contact the maker’s support and ask what they advise for your model.

Dead batteries on a smart box

Being locked out by a dead keypad is a recurring complaint in r/Safes threads, and it applies to any battery lock box. The igloohome runs up to 12 months on 4 AAA cells and has a USB-C jump-start for emergency power. Long-time safe owners on The High Road suggest a schedule: “tape a date when you installed new batteries and just exchange them every year, regardless of use” (The High Road). Keep a backup key with someone you trust.

Key lock box or hide-a-key, smart lock or small safe?

A key lock box is the right tool for a spare house key; it is the wrong tool for valuables, documents or a firearm. Match the container to what you are protecting.

When a lock box is enough

For a landlord and property manager sharing keys with vendors, a pet sitter and caregiver visiting a relative, or a family spare, a key lock box does the job. It is cheap, removable and easy to re-code.

When to step up to a smart lock or small safe

If you are storing passports or deeds, look at a fireproof document safe instead. A handgun belongs in a locking container built for it, such as one of our pistol safe picks, never in a key box, and storage rules vary, so check your state’s official firearm storage page and your local rules; we do not give legal advice. For bigger valuables, our fireproof safe guide compares anchored steel safes.

Our verdict

For that sitter arriving at seven, the key lock box we would hang today is the Kidde AccessPoint 001166 KeySafe: no batteries, a code you change after each visit, room for the house key. It replaces the flowerpot with something a stranger cannot read.

Choose the Master Lock 5400D if you need room for a full key ring and an ordered dial code. Choose the igloohome Smart Keybox 3 if keys go to guests, cleaners and contractors and you want each code to expire. Whichever you pick, mount it out of sight and write the code down somewhere other than your phone’s notes.