What Is Hollow Post Concealment? (Stash Tubes)

Hollow post concealment is ordinary dry-item storage inside a post-shaped enclosure, often called a stash tube. The safe approach is to build a separate, nonstructural cabinet around a post or in an open area, not to hollow a load-bearing member. Check framing, services, fireblocking, and local code before building; dimensions and hardware ratings depend on the actual site.

An orderly storage spot can keep small household items off counters and floors, which may reduce clutter and trip hazards. But a concealed cabinet is not a health device, a fire safe, or a security-rated safe. Its value comes from fitting a real storage need without harming the building.

What hollow post concealment means

A hollow post is a vertical, enclosed cabinet made to look like an architectural post or column. A stash tube is a narrow version that holds small, dry items. Both should be independent, nonstructural storage, not a modified support or a hidden route for utilities.

The outer shell may be wood, metal, or another suitable finish. Inside, a removable panel or door gives access to the cavity. The term “concealment” describes the cabinet’s appearance; it does not mean the space is secure against fire, water, or forced entry.

A decorative post wrap is often the safer starting point. It surrounds an existing post without removing material from it. A freestanding post-shaped cabinet may also work where it does not block a path, access panel, or required clearance.

Use the space only for ordinary, lawful dry goods. Do not store flammables, batteries, weapons, or other hazardous items in it. Keep contents light enough for the panel and its hardware, and do not treat the cavity as a substitute for a rated safe.

Planning: Confirm Structure, Services, and Code Constraints

Before choosing a location, identify what the post is, what is inside or behind it, and which rules apply. The adopted building code and local amendments control. If a wall, ceiling, or floor assembly is rated, or the post’s role is unclear, ask the authority having jurisdiction (AHJ) or a qualified building professional.

Start by checking plans, visible framing, and accessible areas. Look for structural posts, beams, studs, connectors, pipes, wiring, ducts, and existing access points. A stud finder can help locate some materials, but it does not prove that a space is clear. Do not cut or drill to “check” a suspected structural member or service route.

A load-bearing post carries weight from the building above. Never hollow, notch, bore, or replace one to create storage. Even if the exterior still looks sound, removing material can reduce capacity. Have a qualified designer assess any proposed change to a structural member. A separate shell around it is a different design.

Check whether the location is part of a fire-rated wall or ceiling, or contains concealed combustible framing. IRC R302.11 calls for fireblocking in specified concealed spaces. A new cavity or continuous hidden route may affect that requirement. Do not assume that a small opening is exempt; confirm the adopted code and an approved detail with the AHJ.

Also check for environmental-air spaces. A return-air plenum is a space used to move air back to a heating or cooling system. Do not turn one into storage. If wiring is in an environmental-air space, NEC 300.22(C) may limit what wiring methods are allowed. Keep storage away from electrical equipment and its required working and access spaces.

A site survey should answer these questions:

• Is the proposed enclosure separate from the structural post?
• Are utilities, fireblocking, and rated assemblies identified?
• Will the cabinet block required access or clearances?
• Is the cavity outside any return-air or other environmental-air space?
• Does the AHJ need to review the proposed work?

Record what you find before closing any surfaces. If you cannot verify a condition, pause and seek a qualified inspection rather than concealing it.

Access and Clearances: Set the Opening and Hardware Requirements

The opening should suit the items you plan to store, while allowing the panel to open and close without rubbing. Fit figures below are practical targets, not code requirements. Measure the finished site, including trim and flooring, before making parts; building surfaces are rarely as square as a drawing suggests.

First, list the intended contents and their largest dimensions. Size the opening to the largest item, then allow about 25 mm (1 in.) of extra handling clearance. This is a starting target, not a universal rule. Leave at least 6 mm (¼ in.) between the moving panel and adjacent finishes that could bind.

For a fitted removable panel, allow about 3 mm (⅛ in.) of perimeter clearance as a practical target. Confirm the actual gap against the panel material, finish thickness, hinge type, and expected movement. Wood can change size with moisture, so a tight fit may bind later. Do not use a friction fit to hold a heavy panel in place.

Choose hinges, latches, and supports from their manufacturer’s published ratings. Their rated capacity must exceed the installed panel weight and expected use. There is no universal hardware rating for this kind of cabinet. A magnetic catch may help keep a light panel closed, but it should not be the sole support or restraint for a heavy panel.

Design item	Practical starting point	Check before building
Extra opening space	25 mm (1 in.) beyond the largest item	Confirm the item can be handled through the opening
Panel perimeter gap	3 mm (⅛ in.)	Verify with the panel and finish materials
Gap to nearby finish	At least 6 mm (¼ in.)	Check trim, flooring, and panel swing
Hardware capacity	Above the installed panel weight and expected use	Use the maker’s published rating
Cavity size	No universal code size	Fit the site and preserve required clearances

These figures do not set code compliance. A rated assembly, accessibility rule, electrical clearance, or local amendment may require a different detail. When those rules apply, follow the approved detail rather than the fit targets.

Execution: Build a Nonstructural Enclosure and Install the Panel

Build an independent cabinet around a structural post or in a location confirmed to be nonstructural. The enclosure should carry its own finish and panel loads without relying on a weakened support. Use materials and fasteners suited to the substrate, and do not cover required service access or inspection points.

A methodical sequence helps prevent rework:

1. Mark the cabinet footprint and panel opening on site. Recheck door swing, walking paths, service access, and required clearances.
2. Confirm the cavity is clear and outside restricted air spaces. Do not cut framing, wiring, pipes, or fireblocking to make room.
3. Build the enclosure as a separate assembly. If it wraps a post, keep the post intact and avoid loading the wrap in a way that changes the post’s role.
4. Fit the panel to measured clearances. Install rated hinges or supports according to the manufacturer’s instructions, then test for binding through the full opening.
5. Finish the surface without sealing over access points or required fire and electrical features.

Do not route ordinary wiring through the cavity as a shortcut. Do not use the cabinet as a duct, return-air path, or place to hide defects or services that must remain accessible. If the work touches a rated assembly, use an approved construction detail and materials that preserve the required rating.

Before closing the enclosure, photograph concealed conditions and keep the record with the home’s maintenance documents. This is useful for later repairs and for anyone who needs to inspect the area. It is not a substitute for permits or an inspection where either is required.

Installation Scenarios: What Works and What Does Not

These examples are planning scenarios, not documented code approvals or universal designs. They show how the same storage idea changes with the building conditions. In each case, the deciding factor is whether the enclosure stays independent and preserves structure, fire protection, and service access.

Scenario A: Wrap around a known structural post. The post remains untouched, and a separate cabinet shell provides the storage cavity. This may be feasible if the wrap does not obstruct a route or access point. Confirm attachment details and clearances on site; do not assume the post can support added loads.

Scenario B: Narrow cabinet in an open room. A freestanding post-shaped cabinet may avoid changes to framing. It still needs a stable base, suitable panel hardware, and a location that does not block a path. The cabinet should not tip or shift during normal use.

Scenario C: Proposed cavity beside a return grille. Stop and determine whether the nearby space is part of the return-air system. Do not place storage in a plenum or alter air movement. Ask a qualified HVAC or building professional if the boundary is unclear.

Scenario D: Post inside a rated partition. Do not cut into or penetrate the assembly based on appearance alone. Confirm the rating, adopted code, and approved detail with the AHJ. If the required protection cannot be preserved, choose another location.

The useful lesson is simple: a location that looks empty may still have a structural, fire, electrical, or air-handling role. Verify before building, and choose a separate cabinet when conditions are uncertain.

Verification: Inspect Stability, Fireblocking, and Service Access

Before using the cabinet, check that the post itself remains intact and stable, the enclosure is secure, and the panel opens without binding. Confirm that fireblocking and rated construction remain intact, and that utilities and required access points have not been covered. If the work required a permit or inspection, complete that process before closing the area.

Use this final check:

• No structural member was cut, bored, notched, or replaced.
• The panel and its hardware are supported within published ratings.
• No required electrical working space, service access, or inspection point is blocked.
• The cavity is not used for environmental air or ordinary storage of hazardous items.
• Required fireblocking and rated construction are preserved under an approved detail.
• The cabinet is stable, and the opening clears the surrounding finish.

If any item fails, do not load the cavity. Correct the issue or have a qualified professional review it. Concealment should never make a building condition harder to inspect or repair.

Frequently Asked Questions

What is a stash tube in a house?

A stash tube is a narrow, enclosed storage cavity built into a post-shaped cabinet or similar nonstructural enclosure. It is intended for ordinary dry items. The name does not imply a standard size, code approval, or security rating. Keep it separate from structural members and building services.

Can I hollow out a load-bearing post?

No. Do not hollow, drill, notch, or replace a load-bearing post to make storage. Removing material can reduce its capacity even when the outer surface remains intact. Ask a qualified designer to assess any proposed structural alteration. A separate cabinet around an untouched post is a different approach.

Is hollow post concealment allowed by building code?

There is no universal code size or standard detail for a decorative storage post. Rules depend on the building, location, adopted code, and local amendments. Fireblocking, rated assemblies, access, and electrical requirements may apply. Confirm uncertain work with the AHJ before building or closing the space.

How much clearance should a removable panel have?

As practical starting targets, allow about 3 mm (⅛ in.) around a fitted panel and at least 6 mm (¼ in.) from nearby finishes that could bind. Measure on site and account for material movement, hardware, and finish thickness. These are not code-mandated dimensions.

How large should the opening be?

Measure the largest intended item and add about 25 mm (1 in.) for handling as a starting point. Then check the panel swing, cavity depth, and surrounding clearances. The right opening depends on the site and items; no universal opening dimension applies to every post cabinet.

Can a stash tube go inside a wall or return-air space?

Do not use a return-air or environmental-air space as storage. Such spaces may have restrictions, including wiring rules under NEC 300.22(C). A cavity inside a wall may also affect fireblocking or a rated assembly. Confirm the space and code requirements before work begins.

What hardware should hold the access panel?

Select hinges, supports, and latches with manufacturer-published ratings that exceed the installed panel weight and expected use. There is no universal rating for this application. Do not rely on a friction fit or magnetic catch as the only support for a heavy panel.

Can I store batteries or flammables in the cavity?

No. Keep the enclosure for ordinary, lawful dry items, and exclude flammables, batteries, weapons, and other hazardous items. A concealed cabinet is not designed as a fire-safe or hazardous-material container. Follow product storage instructions and applicable safety requirements.

Does a hidden post cabinet replace a safe?

No. It provides storage, not a tested security or fire rating. Choose storage based on the value and risk of the items, and use a rated product when protection from fire or forced entry is needed. Do not assume that being out of sight makes contents secure.

The safest hollow post is an independent cabinet, not a modified support. Survey the site, confirm code and service conditions, build around rather than into structural members, and verify the finished work before storing anything. When the role of a post or assembly is uncertain, stop and ask the AHJ or a qualified professional.

(This article was written by one of our staff writers, Garrett Vance. Visit our Meet the Team page.)