What to do with old LEGO has one simple answer: swap the whole tub. Gather the loose bricks, the part-built sets and the instructions into one lot, list it, and say broadly what you would take back. A family a couple of years behind yours wants all of it. What comes back does not have to be LEGO at all.
That last line is the part most people miss, and it is where this article spends its time.
There is a tub in your house already. It is heavy, it belongs to nobody now, and it has moved from a bedroom to a landing to the loft without being opened once. It is finished rather than broken.
Why the tub is the unit that works
A single minifigure is easy to give away and hard to swap. On its own there is too little behind it for us to be confident, so the model says it does not know rather than guessing. An item with nothing to go on gets no band at all and stays out of matching. That is the honest answer, and we would rather give it than a confident wrong one.
A tub is a different object. A crate of mixed bricks, a complete set with its instructions, the whole Technic shelf — a family wants those in one go, and the model has enough to work with. Our valuation genuinely holds up across toys and games, which is more than we can say for clothes or shoes.
So gather it first. A single lot is quicker for you to write up, and far easier for the family at the other end to say yes to.
Route one: swap it for more LEGO
This is the obvious move and a good one.
Your eight year old has finished with the big creative tubs and wants the harder Technic builds. Somewhere there is a household going the other way: done with Technic, ready for open bricks. Both lofts hold exactly what the other is trying to clear.
That is what the matcher looks for. You list the tub, you say what you would take, and a pair is only suggested when it works in both directions. The useful version of that is not "here is a stranger with LEGO". It is "here is a stranger who wants yours as much as you want theirs". If you want to see how builders describe sets before you write your own, the guide to swapping LEGO sets covers set numbers and completeness in detail.
Two things that make this easier than a private deal
Agreeing a figure never comes up. Each side sits in a band, and a band is all either of you sees. A pairing reads as roughly even, or it reads as lopsided. That single change removes the haggling that kills most private swaps before they start. Nothing is bought and nothing is sold here.
You can be vague about the far end. A private swap needs one specific person holding one specific thing. Here you name a direction and wait.
Closing a small gap with a second item
If two sides do not quite balance, one side adds something small. The box of Duplo that was going anyway. A baseplate. A bag of wheels and axles. That extra item is called a sweetener and it is the only way a gap ever closes here.
Money is never an option here, and there is nothing on the site resembling a balance or a credit. If the gap is too wide for anything either of you owns, the honest outcome is that the swap does not happen.
Route two: swap it for something beyond the toy box
Here is the interesting half.
A tub of bricks can land in the same band as plenty of things that have nothing to do with children. A band is a position on one scale, and that scale runs across every category on the site at once. Category is a filter for finding things, not a wall around what can trade.
So the question to ask is wider than it first looks. Instead of "who else has LEGO", ask which idle things in other people's houses share a band with your tub. Put that way, the answer is most of a house.
What a tub could come back as
Real pairings people set up, with the thing worth checking before you agree.
| What comes back | Why it can sit alongside a tub | Worth checking first |
|---|---|---|
| A cordless drill and a case of bits | Tools lose value slowly and are wanted all year | Battery health, and whether the charger is there |
| A family tent | Bulky, seasonal, and often outgrown in one go | Pole count, and that it has been dried properly |
| An acoustic guitar | A beginner instrument that stopped being played | Neck straightness, and whether it holds tuning |
| A run of board games | Similar audience, similar shelf life | Missing pieces, which is the one thing that matters |
| A turntable | Settled second hand life, easy to describe | Whether the stylus is worn |
| A bundle of children's bikes | Also bulky, also outgrown on a schedule | Frame size and brakes |
None of those are toys. All of them are things a household genuinely needs at some point. You can see roughly where your own tub sits before you list anything, with no account and no sign up, using the swap checker. It runs the real model in your browser.
How to word what you want
Name a direction rather than one object. "Power tools." "Camping gear." "Anything in Garden." "Instruments for a beginner."
A narrow want on a young site can sit quiet for weeks. A broad one tends to find something within days, because it can be satisfied by far more of what is already listed. It also helps to go and look: browse what is up for swap and you will spot categories you had not thought of.
A worked example: one loft, three routes
Say the tub is a crate of mixed bricks, two half-finished Technic sets with their instructions, and three large baseplates. One listing, photographed spread out on a dining table.
- Route one. A parent two years behind swaps a complete set of wooden train track and a tub of Duplo. Both sides are clearing a stage and buying the next one at the same time.
- Route two. A retired builder swaps a cordless drill, a sander and a case of bits, because the grandchildren are the right age for bricks and the workshop is being emptied.
- Route three. Nothing lands for a month, then a pairing appears for a four-berth tent. The tub had sat in the loft for three years, so one more month cost nothing.
Route two is the one people fail to predict, and in practice it is the most common of the three.
Questions people ask about swapping a LEGO tub
Does the LEGO need sorting first?
Sorting by colour or part type makes a listing more appealing, and plenty of people take an unsorted crate happily. Say which it is. A photograph of the bricks spread flat tells someone more than any description.
Do the instructions matter?
Less than missing parts. LEGO publishes building instructions for most sets as free downloads, so a paper booklet is a bonus rather than a requirement. A handful of absent pieces is the thing to mention.
Is a mixed tub better than one boxed set?
They suit different people. A boxed set with its number is specific and easy to value well. A mixed tub solves a bigger problem for whoever takes it. The tub tends to attract families and the set tends to attract builders.
Can one tub cover two swaps?
Split it into two listings and each one is valued and matched on its own. Smaller lots match more slowly, so keep each one substantial.
What about faded or chewed bricks?
Say so plainly and set the condition honestly. Condition feeds into the band, so a well-used crate and a pristine one sit in different places. People are far more relaxed about a stated fault than a surprise one.
The honest limits
A listing is a photo and a title, and we check neither against the other. Somebody could write "complete Millennium Falcon" and photograph a shoebox. We inspect nothing, and we make no promise that we have. The real safeguard sits at the far end: a swap only completes once each side has said the goods arrived.
Each side posts their own. There is no money moving through the site, so there is nothing to pay a courier with. A tub of bricks is heavy, which usually makes a local handover the sensible version. Mark it collection only and say the rough area.
A wide band means we are unsure. Where evidence is thin the range we show gets wider rather than tighter. Read a wide band as the model admitting it, and treat the pairing accordingly.
Chains of three or more people are refused in code. Your tub to one household, their tent to a second, that second house back to you — we will not build that shape, and it is a deliberate limit rather than a feature waiting to be switched on. Every trade is between two people, both ways. If you have run rounds on a hobby forum, read why a two-party matcher works differently from a math trade first.
The short version
A tub of old LEGO is bulky, worth little to a shop, worth a great deal to one specific family, and something our model can place properly. That combination is rarer than it sounds.
Gather it into one lot. Say what you want broadly. Expect the best pairing to come from outside the toy box entirely.