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Found Sealed LEGO in the Loft? What to Do First
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Get it out of the loft and somewhere dry and stable before you do anything else, then check for damp, heat damage and crushing. Lofts are the worst place a sealed collection can live, and the damage is often not visible until you look at the boxes properly in daylight.
- Move it out of the loft first. Heat cycling and damp are the real enemies.
- Check for damp swelling, mould smell and crushed lower boxes.
- Do not open anything to check what is inside.
- Write down set numbers as you bring boxes down. It saves doing it twice.
- Loft-stored sets are often perfectly fine. Check rather than assume either way.
This comes up constantly: somebody clears a loft, finds twenty or two hundred sealed boxes, and has no idea whether they are worth anything or whether the loft has ruined them. Both assumptions are usually wrong.
Get it out first
A loft swings between very hot and very cold, often with poor airflow and sometimes with damp. None of that is good for cardboard. Move the boxes somewhere indoors, dry and stable before you start assessing, and give them a day to come back to room temperature.
What to check for
| Check | What you are looking for |
|---|---|
| Damp | Swollen or wavy cardboard, soft patches, a musty smell |
| Mould | Spotting on the card, usually starting at a corner or along an edge |
| Crushing | The boxes at the bottom of a stack, which carry everything above them |
| Heat | Warped card, or tape that has gone brittle or lifted |
| Sun | A faded panel, usually the one that faced a loft window if there is one |
| Pests | Chew marks or droppings. Worth checking even if it is unpleasant |
Do not open anything
The temptation to check a box is strong and it costs you real money. A sealed set is worth what it is worth because it is sealed. If you want to know what is inside, the set number tells you and so does a two-second search. Opening it to look changes what you are selling.
Write the list as you bring them down
You are already handling every box, so note the set number then rather than restacking everything and doing it again later. The number is on the front, usually in a corner, four to seven digits.
- Set number and how many of each.
- A note against any box that is damaged, damp or faded.
- A photo of anything you are unsure about.
- If a number has worn off, describe the set instead. That is enough to identify it.
Loft-stored does not mean ruined
Plenty of loft collections come through completely fine, particularly where the loft was well insulated and the boxes were up off the joists in something. The damage tends to be concentrated: the bottom of a stack, the boxes nearest a vent, the ones that were in direct sun. Check them rather than writing the lot off.
And it does not mean pristine either
If the boxes are damp swollen or smell musty, say so when you send the list. We will still price them, priced for the condition, and telling us in advance means the figure is right the first time. What causes problems is a list that says mint arriving as a van load of wavy cardboard.
What we can price
Sealed and unopened sets only. Not opened sets, built models, loose bricks by weight, or boxes with pieces missing. Loft finds are often a mix of all of those, so send everything and we will tell you which part is ours.
Getting it down without damaging it
More boxes are damaged coming out of a loft than were damaged sitting in one. It is worth ten minutes of planning.
- Two people if you possibly can. Passing boxes down beats carrying an armful on a ladder.
- Do not stack them on the loft hatch edge while you reposition. That is where corners get crushed.
- Bring the biggest and heaviest down first, while you are fresh and the loft is still walkable.
- Put them somewhere with space to lay them out, not in a tower in the hallway.
- Do not stack more than a few high once they are down. The bottom box carries everything above it.
If a box is already damp or soft, handle that one on its own. Wet cardboard tears under its own weight and a set can end up on the landing.
What a loft does to a box, and how fast
Useful to know which problems are slow and which are quick, because it changes how urgent moving the collection is.
| Condition in the loft | What it does | How fast |
|---|---|---|
| Summer heat cycling | Warps card, makes tape brittle and lifts it | Years, and cumulative |
| Winter damp | Swells and waves the card, then mould | A single bad winter can do it |
| Weight of a stack | Crushes the bottom boxes permanently | Immediate and it never recovers |
| Light through a loft window | Fades the panel facing it | Years |
| Pests | Chew damage, and worse inside | Any time, and often unnoticed |
The order of danger is the opposite of what people assume. Damp and crushing do real harm quickly. Dust does almost nothing and wipes off the outer wrap if there is one. If the loft is dry and the boxes are not stacked heavily, a collection can come down in good condition after a decade.
Found a loft full? Send the list
Set numbers, rough quantities, and an honest word about the condition. One price for the whole lot, we collect at our cost, and you are paid by bank transfer on the day.
Get a price for your collectionWritten by Peter Pilling, BuyMyBricks, 26 September 2026. LEGO® is a trademark of the LEGO Group, which does not sponsor, authorise or endorse this site. Condition guidance is general. Any specific collection is priced on what is actually there.
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