Quick answer: the polyethylene-body Hayman FS4000B is the contractor-grade default for a fresh slab pour, and the smaller Hayman S1200B covers the same rustproof spec in a tighter footprint; both are premium units at the $$$$ tier. For a first floor-safe install on a normal budget, the steel-body Barska Hidden Floor Safe handles the core concealment job at the $$ tier with a key lock and pry-resistant deadbolts.
How to Shop for an In-Floor Safe
A floor safe is a different purchase from every other safe on this site because the installation is the product. Three things decide whether a specific model works in your house. First, slab depth: budget at least 3 to 4 inches of concrete beyond the safe's own height for the collar it sits in, which rules out most upper-floor wood-subfloor installs outright. Second, body material: polyethylene resists rust and groundwater indefinitely but gives up some pry resistance to steel. Third, moisture: any safe sunk below grade sits in a more humid microclimate than a closet shelf, so plan on a silica gel pack and periodic checks regardless of which body material you buy.
Three Picks That Cover Most Installs
Hayman FS4000B Polyethylene Floor Safe
Rustproof polyethylene body, built to resist water intrusion around the case (the door and lock remain the weak point on any floor safe). The straightforward default for a garage or basement slab install where rot and rust are the long-term concern, not a pry bar.
Check price on Amazon →Hayman S1200B Polyethylene Floor Safe
Same poly-body construction as the FS4000B in a smaller footprint, still at the premium end of the category, for buyers who are storing documents or jewelry rather than a larger cache. Compare interior dimensions on the listing before buying if you have a specific item you need to fit.
Check price on Amazon →Barska Hidden Floor Safe
A 0.22 cubic foot steel unit with a key lock and two built-in pry-resistant deadbolts, designed to sit level within the floor. It gives up the Hayman units' volume and rustproof poly body, so a desiccant pack matters here, but it covers the concealment job at a fraction of the cost and carries a 4.4-star verified-buyer average.
View on Amazon →The Full Field, Side by Side
Specs pulled from current manufacturer listings. Confirm interior dimensions and lock type on the specific listing before buying, since they vary within the same product line.
| Safe | Brand | Body Material | Install Type | Price | Link |
|---|---|---|---|---|---|
| FS4000B | Hayman | Polyethylene | In-ground, flush | $$$$ | View |
| S1200B | Hayman | Polyethylene | In-ground, flush | $$$$ | View |
| Hidden Floor Safe (0.22 cu ft) | Barska | Steel | In-ground, flush | $$ | View |
Price tiers are approximate. $ = under $50, $$ = $50 to 150, $$$ = $150 to 300, $$$$ = over $300. Tap any link for the current Amazon price.
Steel Body vs. Polyethylene: The Real Trade-Off
The comparison that matters most in this category is not brand against brand, it is material against material. Polyethylene never rusts, is noticeably lighter to carry into a hole you just cut, and costs less. Its weak point is pry and drill resistance once someone actually locates the safe. Steel gives up the rust immunity (below-grade steel needs a moisture-control routine, a silica gel pack and periodic checks) but holds up better against a determined attempt once concealment has already failed. For most buyers, concealment is doing more of the real security work than the lock or the body material, which is why the flush, covered install matters more than an automatic step up to a heavier body. A related read for buyers weighing a fixed install against a portable option: our wall safe comparison covers the same concealment logic for a vertical mount instead of a floor cut, and our guide to safes for renters and apartments covers the case where cutting into a floor is not an option at all.
What Buyers Report About Floor Safe Installs
Themes pulled from general owner discussion of concealed floor safes across home security and DIY communities, paraphrased in our own words:
- Underestimating slab depth is the most common install mistake. Owners frequently report cutting the hole to the safe's exact height and then discovering there is no room left for the concrete collar around it, forcing a second, larger cut.
- Concealment beats lock strength for the average burglary. A safe hidden under a rug or furniture defeats a rushed, opportunistic search regardless of body material. Owners who skip a rug or furniture cover and leave the safe's lid visible on bare floor report it gets found immediately.
- Below-grade moisture is an ongoing maintenance item, not a one-time concern. Owners of steel-body units in particular report the need to periodically swap silica gel packs, since condensation forms inside a sealed metal box below grade even when the exterior stays dry.
- The door and lock, not the body, are the actual weak point on a waterproof claim. Owners note that a poly body resisting groundwater does not mean the lock mechanism is submersible; treat any in-floor safe as water-resistant, not waterproof.
These notes are aggregated from general owner discussion of the category. Safe Picked does not own or test the products listed and does not make first-person claims about hands-on use.
Jacob’s read on this category
A floor safe is the one product on this site where the install matters more than the spec sheet. Buyers shop steel-versus-poly like it is the deciding factor, but the deciding factor is almost always whether you measured your slab depth correctly before you started cutting. I would rather see a buyer choose the cheaper poly-body model and get the collar depth right than buy the heavier steel unit and end up with a rushed, undersized install that leaves the lid proud of the floor where anyone can see it. If you are not confident about slab depth, call a concrete contractor before you order a safe, not after.
Common Questions
How deep does a floor need to be for an in-floor safe?
Plan for at least 3 to 4 inches of slab depth beyond the safe's own height, since the unit sits inside a concrete collar poured or cut around it, not just dropped into a shallow notch. A garage or basement slab on grade is the easiest install; an upper-floor installation over a wood subfloor usually is not deep enough and needs a different safe style entirely.
Are in-floor safes waterproof?
Polyethylene-body floor safes are commonly built to resist groundwater intrusion around the body, but the door and lock mechanism are the weak point on every design, so treat any in-floor safe as water-resistant rather than fully submersible. Steel-body units are more vulnerable to below-grade condensation over time and benefit from a silica gel pack inside.
Can a determined burglar still find and open a floor safe?
Concealment, not the lock, is what stops the average burglary. A floor safe under carpet or a rug defeats a rushed, opportunistic search, but a targeted burglar with a metal detector or a contractor who knows what to look for can still find one. Combine a floor safe with furniture placement that does not draw attention, and avoid documenting its existence or location anywhere a burglar could access.
Steel or polyethylene body: which is the better floor safe?
Polyethylene-body floor safes are lighter to maneuver into a fresh install, resist rust indefinitely, and typically cost less. Steel-body floor safes are the sturdier build for pry and drill resistance once installed, at a higher price and weight. Confirm the lock type, key or combination dial, on the specific listing before buying; it varies by model within the same product line.
Selection Criteria
All picks link to live Amazon listings that ship within the United States. Because floor safes are a thinner category than pistol or document safes, this comparison currently draws from a single established manufacturer with a dedicated in-floor product line and multiple SKUs; that will expand as we verify additional brands.
Picks are scored on four factors: body material trade-offs (steel vs. polyethylene), install type (flush in-ground mounting with pre-formed collar), price relative to category, and manufacturer specialization in below-grade safe construction specifically, rather than a general safe maker with one floor model bolted onto a broader line.
If you spot a product that has been discontinued or a price that is stale by more than 15 percent, let us know.