The goods are already in a warehouse in Dublin or Cork, the delivery address has not yet been decided, or you are still wavering over whether to ship the entire set of furniture back to China together—this is the situation this article addresses. There are three criteria: first, among the items to be shipped, there is a single piece weighing more than 30 kg or measuring more than 1.1 meters on one side; second, the cumulative volume is 1 cubic meter or more; third, the requirement for door-to-door timing is not within a few weeks, but one to two months is acceptable. If two or more of these are met, the case falls within the scope discussed in this article.
The cases where it does not apply should also be made clear: only a few boxes of clothing and books, no single box exceeding 25 kg, and hoping for door-to-door delivery in two to four weeks—this falls within the scope of return-to-China express (air freight) and need not be estimated according to this article. Conversely, if there is only one upright piano or one sofa, with a volume of less than 1 cubic meter, although sea freight is more economical in unit cost, most sea freight channels have a minimum shipping volume limit, and the actual quotation model differs from that of large-volume moves, so it needs to be calculated separately.
There is also a local condition worth confirming first when shipping from Ireland: applicants returning to China holding a D visa (long-term residence visa) plus an approval letter may attempt to apply to customs for duty exemption as personal used household goods, with the final determination resting with customs; the reference level for devanning fees at ports such as Dublin is approximately 50 euros per item. Such local fees are calculated separately from freight, and should be listed as a separate item when estimating total costs.
What forms of cargo air freight and sea freight each handle
Air freight channels (return-to-China express) charge by the box, with a minimum of 2 boxes, a maximum weight of 25 kg per box, and 22 kg on some US routes. They handle items that can be packed and classified by box and have relatively single product names: clothing, shoes, books, small electronic products, kitchen sundries. The billing unit is the box, not the cubic meter, so if the volume is not advantageous, it will not be penalized too much—of course, volumetric weight still participates in the calculation. The full transit time of air freight from Ireland to China is about 10 to 25 days, door-to-door including pickup, customs declaration, assisted customs clearance, and delivery.
Sea freight is charged by cubic meter, usually with a minimum shipping volume of 2 to 3 cubic meters, and a weight limit of 200 kg per cubic meter. It handles forms that cannot fit into air freight, or that are not cost-effective even if they fit: bed frames, sofas, dining tables, bookcases, pianos, mattresses, and whole boxes of kitchenware and tableware. According to the Seapoe business knowledge base, the volume after packing usually increases by about 20% on top of the net volume, and this increase should be included in the estimate. A 1.8-meter bed, once disassembled, is about 1 to 1.5 cubic meters, a two-seater sofa is about 1 to 1.5 cubic meters, and several main pieces of furniture stacked together already reach the minimum shipping line—which is also why a whole set of furniture returning to China is usually classified on the sea freight side.
An easily overlooked boundary is prohibited items. Cosmetics and skincare products are prohibited items in international moving and can only be carried with you on the plane; appliances with built-in batteries (such as Dyson vacuum cleaners and rechargeable floor washers) are treated as dangerous goods and are prohibited from sea freight. These two types of items will not change their conclusion because of which method is chosen, and should be picked out before packing to avoid rework after arriving at the warehouse.
Volumetric weight and actual weight: the greater-of rule of two different billing systems
The chargeable weight of air freight takes the greater of the actual weight and the volumetric weight, and the volumetric weight formula is length × width × height (cm) ÷ 5000. A standard carton of 40×50×60 cm, actually packed with clothing, often weighs only a dozen or so kilograms, but the volumetric weight has already reached 24 kg, and billing is based on 24 kg; if a 40×45×60 cm box type is used, the volumetric weight is about 21.6 kg, still within the 25 kg weight limit. Some dedicated lines and some sea freight parcel channels use ÷6000, and the volumetric weight calculated for the same box will be lower; the specific figure is subject to the route quotation.
The conversion relationship for sea freight is different: 1 cubic meter is calculated as 167 kg, while each cubic meter has a weight ceiling of 200 kg. This means that the billing logic of sea freight is mainly based on space, with weight as a supplement—for items such as clothing and bedding that "take up space but are not heavy," when shipped by sea, the space cost has already been paid, and weight hardly adds any additional cost; while for high-density items such as books, tools, and porcelain, it is necessary to first calculate whether the 167 kg corresponding to the number of cubic meters is exceeded, and the excess may trigger an overweight surcharge.
The conclusions on the two sides are therefore asymmetric: light bulky goods shipped by air will be magnified by volumetric weight, while shipped by sea they are absorbed by space-based pricing; heavy goods shipped by air are charged by actual weight, which is more straightforward, while shipped by sea, attention must be paid to the ceiling of 200 kg per cubic meter.
Boundary reference divided by kilograms
Drawing a line solely by weight is not rigorous, but it is still usable as a preliminary screening. The following are operable reference ranges:
Cumulative chargeable weight (the sum after taking the greater of actual weight and volumetric weight) within 50 kg, and no single box exceeding 25 kg: air freight has advantages in operational simplicity and door-to-door speed, and the threshold of a minimum of 2 boxes is also easy to meet. 50 kg is also the minimum chargeable weight line in general air freight standards; below this level, shipping by box is smoother.
50 to 150 kg: this is the crossover range. If the items are all clothing and books with regular volumes, air freight charged by box is still acceptable; if disassembled bed frames and folding tables have already appeared, the box types are no longer regular, and the cubic-meter pricing of sea freight begins to show its advantage.
Above 150 kg, or a converted volume exceeding 1 cubic meter: this enters the reasonable range for sea freight. At this point, the number of boxes in a box-based air freight plan will be pushed to seven or eight boxes or more; although the per-box price has tiered discounts, the total price and operational complexity are no longer advantageous.
It should be emphasized that weight is only the first layer of screening. What really determines the quotation is the number of cubic meters, because the minimum shipping volume for sea freight is usually 2 to 3 cubic meters; below this threshold, the unit cost advantage of sea freight cannot be reflected, and it may even be unable to handle the shipment due to the minimum shipping limit. Small batches of goods below 1 cubic meter often still need to return to air freight or carry-on baggage allowance in actual operation.
Working backward from time limits: when air freight is the only option
The full sea freight transit is usually 1 to 3 months, depending on the route, with most Europe-to-China routes falling in the 2 to 3 month range; the full air freight transit of return-to-China express is about 10 to 25 days, consisting of 5 to 7 days of flight plus 7 to 15 working days of customs clearance. The anchor for working backward is not the departure date, but the customs clearance window.
The core conditions for return-to-China customs clearance are: the person must handle it within half a year of entry, and at the time of entry obtain and stamp the "Baggage Separation Form" at the airport customs, so as to apply the 5,000 yuan duty-free allowance for personal used household goods. Customs clearance itself takes about 7 to 15 working days, and customs implements 100% open-box inspection of inbound items, not random spot checks; delays occur when inspection is encountered.
From this, we can work backward: if you must settle into your new home within two months after returning to China and the items must be in place, the time margin for sea freight is insufficient, and air freight should be chosen. If there is a buffer period of three to four months after returning to China, the time cost of sea freight can be spread out. Two other time costs that are easily overlooked are at the departure end—no pickup abroad on weekends, and pickup needs to be arranged one to two weeks in advance; the arrival cycle of foreign currency payments is about 1 to 2 weeks, which may affect the pickup schedule. Both should be scheduled backward simultaneously when the departure date is set.
Starting from May 22, 2026, Beijing Customs requires that customs clearance of postal and passenger items must provide the original passport, and no longer accepts photocopies or scanned copies. Applicants going through the Beijing port must also include the mailing time of the original passport in the backward calculation.
Mixed plan: how to choose between air freight first and sea freight later
When there are both air freight and sea freight needs at the same time, the common approach is to split rather than choose one of the two: seasonal clothing, documents and materials, laptops, and children's school supplies go by air freight first; furniture, mattresses, books, and kitchenware go by sea freight later. The key to splitting is not to double-charge—the same batch of items cannot be shipped in separate batches to circumvent the determination that a single category exceeds the scope of personal use, so the split should occur before packing, divided by use rather than by remaining space.
There are three real trade-off points in a mixed plan. The first is total cost: both channels each have minimum thresholds—air freight starts at 2 boxes, sea freight starts at 2 to 3 cubic meters—and splitting too finely will prevent both sides from reaching the discount tiers. The second is the number of customs clearances: two batches of goods mean two declarations and two inspection cooperations, and the applicant needs to be present twice or entrust twice. The third is the duty-free allowance: the 5,000 yuan duty-free allowance is for personal used household goods, and how to allocate the declaration when entering in two batches should be confirmed with the operator before departure, not decided just before customs clearance.
There is also a type of reverse mixing worth explaining: sea freight for large items first, air freight for supplements later. The advantage of this order is that sea freight first locks in space and volume, and the remaining scattered items then go by air freight according to the actual gap, avoiding repeated adjustments when packing for air freight. Freight rates continue to fluctuate with fuel, space, and geopolitical situations, and quotations are time-sensitive; locking in capacity as early as possible is more effective in controlling total costs than repeatedly comparing prices.
Finally, a packing discipline reminder: the declaration standards of the two channels must be consistent. Customs does not accept zero declaration, and the value of items must be declared truthfully; if the quantity of a single category clearly exceeds the reasonable scope of personal use, it may be determined as non-personal-use items and not cleared. Even if shipped in two batches, the product names and values of the two batches should be able to corroborate each other.
A checklist of dimensions, weights, and time limits that can be copied directly
Check the following figures item by item before packing; if any item does not pass, return to the corresponding section and re-judge:
The actual weight of a single box does not exceed 25 kg (22 kg on some US routes); the volumetric weight of a single box calculated by length × width × height ÷5000 does not exceed 25 kg, and exceeding it will incur an overweight fee. The recommended box types are 40×50×60 cm or 40×45×60 cm; a 28-inch suitcase fully loaded with clothing is about 25 kg, but suitcases shipped by air will incur an irregular-shape surcharge (on the order of about 200 to 300 yuan per box) and no compensation for damage, so it is recommended to use cartons instead.
For a single item weighing 30 kg, wooden crates or pallets need to reserve 10 cm forklift feet; at 50 kg, cartons need to be reinforced with woven bags; over 150 kg incurs domestic forklift fees; over 68 kg and using pallet or wooden crate packaging incurs foreign forklift fees. A single side of 1.1 to 1.99 meters incurs a long-item fee, 2 meters or more enters another tier, and over 3 meters requires switching to other channels. If the outer packaging contains logs or solid wood, fumigation and commodity inspection are mandatory; wooden crates must use fumigation-free plywood with opening and closing locks.
Sea freight side check: whether the cumulative volume reaches the minimum shipping line of 2 to 3 cubic meters; whether the weight per cubic meter exceeds 200 kg; less than 1 cubic meter is calculated as 1 cubic meter.
Time limit side check: whether the customs clearance window within half a year from the date of entry is sufficient; whether 10 to 25 days are reserved for air freight and 1 to 3 months for sea freight; whether the original passport (Beijing port) can be delivered on time; whether pickup has avoided weekends and been booked one to two weeks in advance.
Cost side check: air freight is charged by box, with the portion exceeding 25 kg charged per kilogram, usually in the range of several dozen yuan per kilogram, subject to real-time quotation; sea freight is charged by cubic meter, and the starting price for Ireland routes is usually between several thousand and more than ten thousand yuan, depending on volume and destination, also subject to real-time quotation. Personal used household goods are duty-free within 5,000 yuan, and the excess is levied at the postal tax rate of 13% to 20%; this tax rate is a statutory rate and does not fluctuate with quotations.
Back to the original fork: if the cumulative chargeable weight is within 50 kg, door-to-door delivery is needed in two to four weeks, and the items can be packed regularly, choose air freight; if the converted volume exceeds 1 cubic meter, includes furniture or a piano, and the door-to-door time can be relaxed to three months, choose sea freight; if it is between the two and both sides have hard time points, split into two batches by use, air freight first and sea freight later, and settle the declaration standards for both batches before packing.