Which Customs Code Applies to Your Prefabricated Sauna?

Key Takeaways

• A prefabricated sauna is normally classified under heading 9406, prefabricated buildings, not under Chapter 44 as an article of wood.

• In the EU the code is CN 9406 10 00, of wood, and the third-country duty is 2.70% (EU Access2Markets, accessed July 2026).

• Note 4 to Chapter 94 is the whole test: finished in the factory, or elements entered together to be assembled on site.

• General Interpretative Rule 2(a) pulls a flat-pack kit into the same heading as the finished cabin.

• Norway and Iceland charge no duty under the EEA Agreement, but only against a proof of origin such as a EUR.1 certificate or an origin declaration on the invoice.

• Switzerland removed import duties on all industrial goods on 1 January 2024, so origin no longer changes the Swiss rate.

• The UK third-country rate is 2.00%, dropping to 0% under the Trade and Cooperation Agreement with a statement on origin.

Declare a sauna under the wrong heading and you'll pay the wrong duty, then pay it again when the correction lands. We ship cube and barrel saunas out of KlaipÄ—da, so we write the paperwork your broker keys in. By the end you'll know which heading to claim, how five customs territories treat it, and which document proves it.

which customs code applies to your prefabricated sauna?

The customs code that applies to a prefabricated sauna is heading 9406, prefabricated buildings, and in the EU that means CN 9406 10 00, of wood. The test is Note 4 to Chapter 94. A prefabricated building is one finished in the factory, or put up as elements entered together to be assembled on site. A sauna cabin fits that wording whether it arrives whole on a trailer or flat-packed in a crate. Classify it as an article of wood instead and you're in the wrong chapter at the wrong rate.

That sounds settled. Then you search for it.

The two wrong turns everyone takes

Search the question in English and you'll mostly get American answers. The top results are US Customs rulings and HS lookup sites built on the US tariff schedule. One of them, ruling N304393 from June 2019, does classify a prefabricated sauna under 9406.10.0000. It gets quoted everywhere.

It's also the wrong document to hand your Norwegian broker.

A rate in a US ruling is a US rate. It says nothing about what Tolletaten, Skatturinn or HMRC will charge you, and copying that percentage into a European declaration is how a correction starts.

Now the second wrong turn, which costs more because it looks reasonable. When the shipping document says "wooden cabin" or "timber structure", a broker under time pressure reaches for Chapter 44, articles of wood. It reads sensibly. The walls are wood. The floor is wood. The cladding is wood.

But Note 4 doesn't ask what the thing is made of. It asks what the thing is.

A building finished in the factory is a prefabricated building. Material only decides the subheading after that, which is why 9406 10 00 exists as a separate line from the steel and the other-materials lines under the same heading. Get the heading right and the material question answers itself. Get the heading wrong and the material question was never the question.

How Note 4 and Rule 2(a) decide it

Two rules do all the work here, and both are short enough to read at the loading bay.

Note 4 to Chapter 94 defines a prefabricated building as one finished in the factory, or put up as elements entered together, to be assembled on site. That wording is reproduced in the EU's Combined Nomenclature, currently set by Commission Implementing Regulation (EU) 2025/1926, published on 31 October 2025 and applying from 1 January 2026.

General Interpretative Rule 2(a) closes the other door. A reference to an article includes that article presented unassembled or disassembled. So a kit doesn't escape 9406 by arriving in pieces, as long as the pieces travel together.

That one line in Note 4 is what decides which customs code applies to your prefabricated sauna.

Here's how the five customs territories our partners actually declare into treat the same product.

Rates checked in the EU Access2Markets database and the UK Integrated Online Tariff in July 2026. The EU record showed a last update of 24 July 2026. Check both again before you declare, because they move.

Now put a number on it. Say the customs value of one load is 50,000 euros. At the EU third-country rate of 2.70%, that's 1,350 euros of duty. At the UK rate of 2.00%, it's 1,000 euros. Both go to zero with a valid proof of origin. So that single sheet of paper is worth 1,350 euros a load in the EU, and it's worth nothing at all if it's attached to the wrong code.

Three states, and your last shipment was in one of them. No origin document, so you pay the full rate and file it as freight cost. A document that describes the goods loosely, so it holds until the first audit. A document that carries the same commodity code as the declaration, so it survives one.

The paperwork behind that third state is ordinary factory record-keeping: where the timber came from, where the work happened, what went into the unit. Ours comes from within roughly 200 kilometres of the workshop, which is what we mean by The 200-Kilometre Rule. Your supplier should be able to describe theirs in the same flat, boring way. If they can't, the origin question is going to find you later.

Here's how you check the code before the truck leaves

You don't need a customs consultant for this. You need six answers in writing, before the unit is loaded, from whoever is making the export declaration. Copy these into an e-mail as they are.

1. Which heading do you declare on export, 9406 or something in Chapter 44?

2. Which eight-digit code goes on the invoice line for this unit?

3. Is the unit shipped assembled, or as elements entered together to be assembled on site?

4. What origin do you declare for it, and on which document?

5. If the consignment is above 6,000 euros, what is your REX number?

6. Will the code and the origin statement be printed on the commercial invoice itself, not sent separately?

Question six is the one that matters most, and it's the one most suppliers dodge. A code in an e-mail is a conversation. A code on the invoice is a document your broker can key in and your customs authority can audit. The same logic applies to every other claim a factory makes about itself, which is why it's worth checking how a manufacturer documents its own work before the first container, not after.

And if the unit is going to be craned onto a plot rather than delivered to a yard, the classification question sits next to a second one about whether the build needs a permit at all. Same product, two different authorities, two different files.

You don't need to reclassify your whole catalogue this week. Take the last commercial invoice a supplier sent you, find the line with the commodity code on it, and check whether it says 9406 or something in Chapter 44. If there's no code on the invoice at all, that's your answer already. It's your EORI number on the declaration, not theirs.

Does a sauna count as a prefabricated building under heading 9406?

In most cases, yes. Note 4 to Chapter 94 covers buildings finished in the factory, or put up as elements entered together to be assembled on site, and a sauna cabin meets that wording. A US Customs ruling issued in June 2019 reached the same conclusion for a prefabricated sauna, classifying it as a prefabricated building of wood.

What CN code applies to a sauna kit rather than a finished cabin?

The same one. General Interpretative Rule 2(a) says a reference to an article includes that article presented unassembled or disassembled. A flat-pack sauna whose panels travel in one consignment is still classified as the finished building, so it stays in CN 9406 10 00 where the structure is predominantly wood.

Is a sauna duty-free entering Norway or Switzerland?

Switzerland removed import duties on all industrial goods on 1 January 2024, whatever their origin, although you still lodge a declaration and pay VAT. Norway states that no customs duty applies to building materials and grants EEA preference on originating goods, but the importer still needs a valid proof of origin on file.

How do you get a binding tariff decision for a sauna?

You apply for Binding Tariff Information through the EU Customs Trader Portal, in the member state where you're established or where you'll import. A BTI decision binds all EU customs administrations and the holder, is generally valid for three years, and is requested per product type.

Who pays if the customs code on the declaration turns out to be wrong?

The importer of record, which is usually the reseller rather than the factory. The declaration is lodged in the importer's name and under the importer's EORI number, so any recovery after clearance lands on that account. That's the reason the code belongs on the commercial invoice before the goods move.