Flat-pack furniture assembly is the process of joining pre-cut, pre-drilled panels into a finished item using the fixings supplied in the box. Most builds rely on cam-lock fasteners, wooden dowels and a handful of screws, following a sequence set out in a printed or online instruction sheet. Done in order, with the right panel facing the right way, the parts pull together into a rigid structure.
What a flat-pack build actually involves
A flat-pack item arrives as a stack of panels, a bag of fittings, and an instruction booklet. The panels are usually engineered wood — chipboard or MDF — with a melamine or veneer surface, and the holes for every fixing are already drilled at the factory. Your job is to match the panels to the diagrams and connect them in the correct order.
The work is methodical rather than skilled in the trade sense. Laying out the parts, checking the count against the booklet, and identifying which face is the outside before you start saves most of the trouble later. A clear floor space, the right screwdriver, and unhurried attention to the sequence matter more than tools.
The fixings: cam locks, dowels and screws
Flat-pack furniture assembly is the process of joining pre-cut, pre-drilled panels into a finished item using the fixings supplied in the box.
Three fixings do most of the work in modern flat-pack furniture, and knowing what each one does helps you spot when something is in the wrong place.
- Cam locks (cam-and-dowel fixings): a two-part fastener. A metal bolt or dowel sits in one panel, and a round disc — the cam — sits in a hole on the adjoining panel. Turning the cam a quarter to a half turn grips the bolt and draws the two panels tight. The arrow stamped on the cam should point towards the joint when it is locked.
- Wooden dowels: short ridged pegs that slot into matching holes to align two panels and stop them sliding. They carry no clamping force on their own; they keep edges flush while the cam locks or screws do the pulling.
- Screws: used for hinges, handles, back panels and brackets. Self-tapping screws cut their own thread into chipboard, so they should go in straight and stop once snug — over-driving strips the hole.
Some ranges add confirmat screws (a thick, blunt screw for panel-to-panel joints), corner blocks, or metal brackets for heavier units. The principle stays the same: dowels align, cams and screws hold.
Where self-assembly builds usually go wrong
Most problems trace back to a few repeatable mistakes rather than faulty parts. The common ones are worth naming so they can be avoided.
- A panel fitted the wrong way round. Many panels look symmetrical but have pre-drilled holes on one face only, or a finished edge on one side. Fitting one backwards usually shows up several steps later, when the next panel will not line up.
- Cam locks not fully turned. A cam that is only part-turned leaves the joint loose, so the whole unit racks (leans out of square) when moved. Each cam should turn until it firmly resists.
- Over-tightening into chipboard. Forcing a screw or cam past the point of resistance crushes the board around it. The fixing then spins freely and no longer holds.
- Skipping the back panel sequence. The thin hardboard back is often what squares a cabinet. Fitting it too late, or not at all, leaves a wobbly carcass.
- Working on a hard floor without protection. Melamine surfaces scratch and chip easily, and corners take damage if the part-built unit is dragged.
Wardrobe and larger unit assembly raises the stakes because the panels are big and heavy. A tall wardrobe is usually built lying down, then raised upright — which needs space and, often, a second pair of hands so the joints are not stressed during the lift.
Why tall units must be anchored to the wall
Tall and top-heavy furniture — wardrobes, bookcases, tall chests of drawers — can tip forward if it is loaded unevenly or if a child climbs or pulls on it. Anti-tip anchoring is a strap or bracket that fixes the top of the unit to the wall behind it, so the furniture cannot pivot away from the wall.
Most manufacturers now supply a restraint strap in the box and mark the step as mandatory in the instructions. The fixing into the wall must suit the wall type: a plug and screw into masonry, or a suitable cavity fixing into a plasterboard wall, ideally landing on a stud where possible. A strap screwed only into thin plasterboard offers little resistance.
The risk is real with chests of drawers in particular, because an open drawer shifts the centre of gravity forward. Anchoring is the single step most often skipped and the one that matters most for safety, especially in homes with young children.
What drives the time and cost of a build
The time a build takes depends mostly on the number of parts and the size of the item rather than its price. A small bedside cabinet might be an hour; a large wardrobe with sliding doors and internal fittings can take a full afternoon, particularly when doors need aligning at the end.
Factors that push the time up include:
- The number of drawers, doors and shelves, each adding its own set of fixings and adjustments.
- Sliding or soft-close door mechanisms, which need careful alignment.
- Heavy panels that need two people to handle safely.
- Wall anchoring into a difficult surface, which depends on the wall type and the right fixings being to hand.
- Access — a narrow doorway or a build in an upstairs room limits how the unit can be moved.
If someone is paid to assemble furniture, charges are commonly based on time or on a per-item rate, and disposal of the packaging may be separate. When comparing, it is worth asking whether wall anchoring is included, since that is the step that protects the finished result.
Updated: June 2026