Assembling flat-pack furniture without the instructions
The Abimeister team · Updated · 4 min read
Second-hand and gifted flat-pack furniture usually arrives without its manual, and the previous owner rarely remembers which website it came from. This is fixable in most cases: manufacturers keep instructions online, parts sort themselves by logic once you look properly, and there is a sensible order to follow even without a diagram. This guide sets out how to identify the piece, sort the fasteners, work out the assembly sequence, avoid the mistake that causes most rebuilds, and recognise the point where it makes more sense to call someone than to keep going.
How to identify the piece and find the manual
Start by turning the piece, or its packaging if you still have it, looking for a label with a model name, a batch number or a barcode. Flat-pack furniture almost always carries one somewhere, often on the inside of a panel or the bottom of a drawer, even second-hand.
If there is no label, search by description on the manufacturer's website: material, colour, rough dimensions, number of doors or drawers. IKEA, JYSK and similar retailers keep manuals for older ranges searchable by product name, and a lot of once-discontinued lines are still listed.
A reverse image search with a clear photograph of the whole piece often finds the exact listing faster than text search, especially for furniture that changed little between years. If you find even a similar model, its manual usually shows the same fastener types and panel layout.
Sorting parts and fasteners before you start
Lay everything out on the floor and group it by type: panels, shelves, doors, then fasteners separately by size and shape. Cam locks, dowels, cam screws and shelf pins look similar in a bag but do very different jobs, so mixing them up early costs time later.
Count how many of each fastener you have and match that against how many holes you can see drilled into the panels. A panel with eight cam-lock holes and six pre-inserted dowels needs eight cam screws and six matching cams, not a guess.
Photograph the parts laid out before you touch them, and photograph any pre-fitted hardware close up. These photographs become your reference once you are halfway through and need to check what a hole was for.
- Panels and shelves, grouped by size
- Cam locks and cam screws, counted as a pair
- Dowels, checked against drilled holes
- Screws and bolts, sorted by length and head type
- Hinges, handles and any pre-fitted hardware
- Small bags of spares, kept aside and not assumed to be extra
A logical order for assembly without a manual
Work from the inside out and from the bottom up. Fit internal fixed shelves and dividers into the two largest side panels first, since these panels are hardest to work around once the back and the base are attached.
Add the base and back panel next, checking every corner is square before tightening anything fully. A carcass that goes together slightly out of square will fight you on the doors later, and no amount of care with the hinges will fix that.
Leave doors, drawers and any adjustable shelves until last. Adjustable pins and shelf holes are easy to identify once the carcass is standing, and hanging a door before the frame is square usually means undoing it again.
The mistake most people make, and how to avoid it
The most common error is tightening every fastener fully as you go, rather than assembling the whole carcass loosely first and squaring it before the final tightening pass. Once cam locks are fully seated, a panel that is even a few millimetres out is hard to shift without marking the surface.
The second most common mistake follows from the first: doors and drawer fronts get fitted to a carcass that was never checked for square, so gaps appear at the top or bottom that no amount of hinge adjustment corrects properly. Checking with a spirit level or by measuring both diagonals of the frame before final tightening takes a minute and avoids this.
When to stop and call someone instead
Stop if a panel has split along a dowel hole, if cam locks strip and no longer grip, or if you are missing a fastener with no equivalent in your spares and no way to buy a matching one. Forcing a damaged joint together rarely holds for long.
It is also worth stopping if the piece is large, heavy, or needs to be assembled in place against a wall you cannot easily move away from, since a wardrobe or bookcase assembled slightly wrong is difficult to correct once it is upright and loaded.
Furniture assembly from us starts at 39 € per hour, with a minimum of one hour and 30-minute steps after that, and covers exactly this kind of job where the manual is missing and the piece needs to be worked out on site. If the finished piece then needs fixing to a wall, shelves and mirrors are the same rate, from 39 € per hour.
Sort every part and fastener before you start, assemble loosely and check the carcass is square before the final tightening pass, and stop before forcing a stripped or split joint.