Best Key Safe for Outside a House: 5 Secure Picks for Rentals, Guests and Spare Keys

A key safe outside a house solves one problem fast: getting a key to someone without handing it over in person. This roundup covers five wall-mounted combination lock boxes that suit three buyer types — landlords and realtors managing access, homeowners who want a spare key for family or tradespeople, and budget shoppers who just need a simple code box by the door. Every pick below is a real Amazon listing with its ASIN and current price tier noted. The overview table shows the differences at a glance; the reviews explain who each box is actually for.

Overview of the Picks

Product	Key Spec	Best Use	Price Tier
Master Lock 5401D Wall Mounted Key Lock Box	Resettable 4-digit code, 5-key capacity, black/silver	Realtors and property managers who need a durable everyday box	Mid
Puroma Key Lock Box Combo Wall-Mounted Storage Safe	Resettable combination, 5-key capacity, weatherproof	Renters and homeowners who want a cheap, portable spare-key box	Budget
Puroma Key Lock Box Large with Code Lockbox Outdoor Wall Mount	Resettable combination, 5-key capacity, doorknob-mountable	Guests and house-sitters who need a large, flexible box	Budget
Master Lock Wall Mount Key Lock Box with Push Button 5423EC	Push-button combination, 5-key capacity, black	Homeowners who want one-handed access without dialing a code	Mid
Puroma Key Lock Box Outdoor 4 Digit Code Combination Lockbox	Resettable 4-digit code, 5-key capacity, weatherproof	Contractors and realtors who need a high-volume, low-cost box	Budget

Master Lock 5401D Wall Mounted Key Lock Box

Brand: Master Lock
Type: Wall-mounted combination lock box
Code Type: Resettable 4-digit combination
Key Capacity: 5 keys
Finish: Black and silver
Intended Use: Realtors, landlords, property managers

Wall Mounted Key Lock Box For Realtors, Landlords, Property Managers; Secure Key Storage, Resettable 4-digit Code Master Lock 5-Key Combination Safe Black/Silver 5401D

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This is the box most people picture when they think of a key safe: a compact metal unit that screws to a wall, with a resettable four-digit dial and room for five keys. Master Lock builds it for the rental trade, so the housing and shackle are meant to take years of open-and-close use rather than a season by the door. The black-and-silver finish is understated enough for a front porch and heavy enough to read as a serious lock rather than a plastic container.

It earned its place as the mid-tier benchmark because the hardware feels like the point of the purchase, not an afterthought. Realtors and property managers who change the code between tenants get a box that can be re-set repeatedly without loosening up. The trade-off: the four-digit dial is slower to open in the dark than a push-button model, and the price sits well above the plastic budget boxes, so a homeowner who only needs a spare key twice a year may be paying for durability they never use.

Puroma Key Lock Box Combo Wall-Mounted Storage Safe

Brand: Puroma
Type: Wall-mounted combination lock box
Code Type: Resettable combination
Key Capacity: 5 keys
Weather Resistance: Weatherproof
Intended Use: Contractors, guests, realtors

Outside, Portable, Wall Mount, Resettable, Combination, Weatherproof, High-capacity, Hold 5 Keys, Contractor Guest Realtor Puroma Key Lock Box Combo Wall-Mounted Storage Safe Lockbox Home Office

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The cheapest pick in the roundup, and the one to start with if the goal is simply a code box by the door. Puroma lists it as weatherproof, wall-mountable and resettable, with room for five keys — the same headline specs as boxes costing several times more. The housing is plastic, which is what the price tier buys, but for a covered porch or a sheltered side entrance that is usually enough.

It suits renters and homeowners who want a spare key accessible to family, a cleaner or a dog walker without a permanent hardware installation. The portable design means it can move house with the owner. The trade-off: a plastic body and a budget combination mechanism are not built for the repeated code changes and rough handling a busy rental property demands, so landlords should look at the Master Lock models instead.

Puroma Key Lock Box Large with Code Lockbox Outdoor Wall Mount

Brand: Puroma
Type: Large combination lock box
Code Type: Resettable combination
Key Capacity: 5 keys
Mounting: Wall mount or doorknob
Weather Resistance: Weatherproof
Finish: Gray

Resettable Combination, For Guest Realtor & House Outside, High-capacity, Hold 5 Keys, Portable, Doorknob, Weatherproof Puroma Key Lock Box Large with Code Lockbox Outdoor Wall Mount Safe 1 Gray

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This is the flexible option: a large-format box that can be screwed to a wall or hung over a doorknob, which makes it useful for short-term rentals and house-sitting setups where drilling is not an option. Puroma rates it weatherproof and resettable, with the five-key capacity shared across the Puroma line. The gray finish blends into most exterior walls better than a glossy black box.

It suits guests, house-sitters and Airbnb hosts who need a code box that can be repositioned between stays. The doorknob mounting is the feature that earns it a slot here — no other pick in this roundup advertises it. The trade-off: a box that hangs on a knob is easier to remove than one bolted to brick, so it should be treated as a convenience for trusted visitors rather than a high-security solution.

Master Lock Wall Mount Key Lock Box with Push Button 5423EC

Brand: Master Lock
Type: Wall-mounted push-button lock box
Code Type: Push-button combination
Key Capacity: 5 keys
Finish: Black
Intended Use: House keys, outdoor use

Master Lock Wall Mount Key Lock Box with Push Button for House Keys, Outdoor Safe with Combination Lock, 5 Key Capacity, 5423EC , Black

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The push-button mechanism is the reason to pick this one. Instead of dialing a four-digit code, the user presses a sequence of buttons, which is faster and easier to operate one-handed with an arm full of shopping. Master Lock pairs it with the same five-key capacity and outdoor-rated housing as the 5401D, finished in plain black.

It suits homeowners who want a spare key box that elderly relatives or regular visitors can open without reading a dial in low light. The build quality is the same trade-grade standard as the rest of the Master Lock line. The trade-off: push-button codes are typically shorter and offer fewer possible combinations than a four-digit dial, so this box is better for a household spare key than for a property with a constantly changing roster of tenants.

Puroma Key Lock Box Outdoor 4 Digit Code Combination Lockbox

Brand: Puroma
Type: Wall-mounted combination lock box
Code Type: Resettable 4-digit combination
Key Capacity: 5 keys
Weather Resistance: Weatherproof
Finish: Gray
Intended Use: Contractors, guests, realtors

For Contractors Guest Realtor Storage Keys, Portable, Home Wall Mount, Resettable, Combination, Weatherproof, High-capacity Puroma Key Lock Box Outdoor 4 Digit Code Combination Lockbox House, 1 Gray

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The most popular box in this roundup by a wide margin, and the one that hits the sweet spot between price and features. Puroma gives it a resettable four-digit code, weatherproof construction, wall mounting and five-key capacity, all in a gray housing that does not draw attention. It is pitched at contractors, guests and realtors, which is a fair summary of who buys this type of box.

It suits anyone who wants dial-style security without paying Master Lock prices — a solid middle option for a homeowner or a small landlord. The four-digit resettable code is easier to change between users than a fixed push-button sequence. The trade-off: at this price the metal is thinner and the latch less refined than the premium picks, so it is best suited to a sheltered wall rather than a fully exposed gatepost.

Before You Buy

• Material: Metal housings resist prying and weather better than plastic; plastic boxes are lighter and cheaper but suit sheltered spots only.
• Code type: A resettable four-digit dial offers more combinations and easier code changes; push-button models are faster to open one-handed.
• Capacity: Five keys is the standard for this category — enough for a house key, a deadbolt key and a spare, but not for a large keyring.
• Mounting: Wall-mounted boxes need screws and a solid surface; doorknob-hanging models suit rentals where drilling is not permitted.
• Weather resistance: Look for a weatherproof rating if the box faces rain or direct sun, and mount under an overhang where possible.
• Code changes: Resettable combinations matter for landlords and hosts who rotate access between tenants or guests.
• Placement: Keep the box out of plain sight from the street and away from the door it opens, so a found code is not an instant entry.

Frequently Asked Questions

1. What is the best key safe for outside a house?
   The Master Lock 5401D is the strongest all-round pick for durability and repeated code changes, while the Puroma 4-digit box is the best value for most homeowners.

2. Are key safes actually secure?
   A wall-mounted metal box with a four-digit resettable code is a real deterrent, but no key safe is burglar-proof. Mount it out of sight and change the code after each guest or tenant.

3. Can a key safe be mounted on brick or concrete?
   Yes, provided the correct screws and wall plugs are used. Doorknob-hanging models like the Puroma Large avoid drilling entirely.

4. How many keys fit in a standard lock box?
   The picks here all hold five keys, which covers a house key, a deadbolt key and a couple of spares.

5. Do key safes rust outdoors?
   Metal boxes with a weatherproof finish hold up well under an overhang; plastic boxes resist rust but can crack in extreme cold. Shelter matters more than material.

6. Should the code be changed regularly?
   Yes — change it after every tenant, guest or contractor who had access, and avoid obvious sequences like 1234.

Bottom Line

For most buyers, the Master Lock 5401D is the best key safe for outside a house: trade-grade hardware, a resettable four-digit code and five-key capacity that stands up to years of use. Homeowners on a tighter budget should start with the Puroma 4-digit box, and hosts who cannot drill should look at the doorknob-mountable Puroma Large.