Yes — you can convert part of an existing warehouse into a U.S. Customs bonded warehouse. You don’t need to build a new facility, and you don’t need to own the building. Under 19 CFR 19.2, a lessee can apply directly, as long as the space, security, and recordkeeping meet CBP’s standards.
The reason it’s worth doing: goods sitting in a bonded warehouse haven’t been entered into U.S. commerce yet, so the duty on them isn’t due yet either. You defer it until the inventory actually sells, moves, or gets re-exported. If you’re carrying six or seven figures of inventory at any given time, that’s not a one-time discount — it’s ongoing working capital you’re currently giving up.
This article covers what CBP actually requires, what the process looks like in practice, and when a bonded warehouse is the right call versus a Foreign-Trade Zone. For how a bonded program actually gets built and run inside a working facility, see how Navco does it below.
What a Class 3 Bonded Warehouse Is
CBP recognizes nine classes of bonded warehouse. For a company converting part of an existing distribution center, the answer is almost always a Class 3 — a public bonded warehouse that can store merchandise belonging to more than one importer (19 CFR 19.1(a)). It allows light handling — cleaning, sorting, repacking — but not manufacturing. If your operation needs assembly or production, you’re looking at a Foreign-Trade Zone instead (see the comparison below).
Is This Feasible for Your Facility?
This is usually where the idea stalls out, and it shouldn’t:
- You don’t need to own the building. 19 CFR 19.2 explicitly allows an owner or lessee to apply. Your lease just needs to address what happens to bonded merchandise if the lease ends.
- You don’t need to bond the whole building. CBP routinely approves bonded space covering only part of a facility, as long as it’s physically separated from non-bonded operations to the Port Director’s satisfaction (19 CFR 19.4).
- There’s no fixed spec for that separation. Walls, fencing, or marked lines can all work — it depends on what your specific port wants to see.
In practice, this means a 3PL, importer, or distributor operating out of a leased DC can typically convert part of that space without a new build or a new lease.
What the Process Actually Involves
Approval is a written application to the CBP Port Director nearest your facility — there’s no online portal or single form. CBP wants to see that you can run the space securely and account for inventory: a written procedures manual, evidence the site is secure, and a customs bond.
The bond is a continuous bond, not a per-shipment bond, with a CBP-set minimum of $25,000 per building. The premium itself is a commercial cost you’d get from a surety or your broker, not a number CBP publishes.
Once you’re operating, CBP expects ongoing discipline: inventory tracked to the entry level, records kept for 5 years, and an annual report (CBP Form 300) summarizing activity. None of this is exotic — it’s the same discipline a well-run 3PL should already have. The difference is that CBP will actually check.
The real work isn’t the paperwork. It’s building a system — inventory control, security, procedures — that holds up when CBP asks to see it. That’s the part most companies underestimate, and it’s the part a broker who has stood up bonded space before can get right the first time.
What It Costs and How Long It Takes
CBP doesn’t publish a standard cost or timeline for approval — anyone quoting you an exact number without knowing your facility is guessing. What’s structurally certain: the bond (minimum $25,000 per building, set by CBP), facility modifications for security and segregation, and the cost of inventory control that meets CBP’s standard. Timeline depends on your port and how complete your application is — get a real estimate from a broker who’s recently taken an application through your specific port.
Bonded Warehouse or FTZ?
Both defer duty. They’re built for different operations, and the right one depends on what you’re actually doing with the inventory.
| Class 3 Bonded Warehouse | Foreign-Trade Zone | |
|---|---|---|
| What it’s for | Storage, sorting, light handling — no manufacturing | Storage plus manufacturing and assembly |
| Storage duration | Capped at 5 years from import date (19 U.S.C. 1557) | No comparable cap in the bonded-warehouse sense |
| Who approves it | CBP Port Director — single agency | Foreign-Trade Zones Board, then CBP activation — two agencies |
| Typical approval track | Faster, port-level review | New zone ≈ 10 months; production authority ≈ up to 12 months |
If you’re doing pure storage, sorting, and light handling, a Class 3 bonded warehouse is the faster path. If you need to assemble or manufacture, an FTZ is the right tool. Some companies eventually run both.
How Navco Turns Your Warehouse Into a Bonded Warehouse
Meeting CBP’s requirements is where most companies get stuck — not because the rules are secret, but because writing a procedures manual that survives a CBP review, configuring inventory control that ties to entry-level detail, and negotiating a physical security determination with a specific port takes someone who’s done it before.
Navco’s In-House Bonded / In-Bond Program is built to do exactly that inside your existing facility, start to finish: procedures manual, inventory-control system, physical security determination with the port, bond execution, and ongoing Form 300 and recordkeeping once you’re operating — part of Navco’s broader Trade & Logistics Advisory practice.
Navco operates under a national CBP permit and manages 200,000+ square feet of bonded and general warehousing across South Texas, including bonded facilities in Brownsville and Los Indios — both within five miles of a commercial border crossing. Once part of your facility is bonded, the next conversation is usually how long inventory sits before it sells, and whether tariff exposure elsewhere in your supply chain can be deferred or recovered the same way (see Fulfillment-from-Bond and TERM).
If you’re evaluating whether part of your own distribution center can become bonded space, that’s a conversation about your specific facility, lease, merchandise, and port — not a generic answer. Talk to Navco.
This is a general overview, not legal advice — your specific facility, lease, and merchandise mix should be reviewed with your customs broker or trade counsel before you apply.
Frequently Asked Questions
Can I bond only part of my warehouse, not the whole building?
Yes. CBP routinely approves bonded space covering part of a facility. The Port Director determines how bonded and non-bonded areas must be separated based on the specific facility (19 CFR 19.4).
Do I need to own the building to get CBP approval?
No. 19 CFR 19.2 explicitly allows an owner or lessee to apply. If you lease, your lease needs to address how bonded merchandise will be handled if the lease ends.
What’s the difference between a bonded warehouse and an FTZ?
A bonded warehouse (Class 3) covers storage, sorting, and repacking, with a 5-year storage cap and CBP Port Director approval. An FTZ additionally allows manufacturing and assembly and is approved by the Foreign-Trade Zones Board — a separate, generally longer process.
How long does CBP take to approve a bonded warehouse application?
CBP does not publish a fixed timeline. It depends on application completeness and the specific port’s workload.
What does the bond cost?
CBP’s published schedule sets a $25,000 minimum per building under the custodial bond. The premium a surety charges is a separate, commercial cost that varies by principal.
Can I manufacture or assemble products in a bonded warehouse?
No. Cleaning, sorting, repacking, and similar manipulation are allowed, but not manufacturing. Assembly or production requires an FTZ with production authority.
How long can merchandise stay in a bonded warehouse?
Up to 5 years from the date of importation, under 19 U.S.C. 1557, with extensions available only at CBP’s discretion for good cause shown.