Which light fitting suits your ceiling: plasterboard, concrete or wood

How to work out what kind of ceiling you have

If you live in a panel building from the 1960s to 1980s, the ceiling is almost certainly a concrete slab, sometimes with a thin skim coat. Tap it: concrete gives a dull, solid knock everywhere, with no flex.

A suspended plasterboard ceiling sounds hollow when you tap it, and the sound changes every 40 to 60 centimetres as you move across a stud or the metal frame behind it. These are common in renovated flats and newer builds, often installed to hide services or create recessed lighting.

In a wooden house built before the 1950s, the ceiling is usually lath-and-plaster: thin wooden laths nailed to the joists, covered in a layer of plaster. It sounds hollow like plasterboard but feels softer, and you may see fine cracks following a grid pattern if you look closely.

Concrete ceiling in a panel flat: what it allows

Concrete is the easiest base to work with and the strongest. A hook or bracket fixed into concrete with the right plug can carry considerably more than the weight of any domestic light fitting, so a chandelier, a cluster pendant or a heavy metal fitting is not a problem structurally.

The job itself needs a hammer drill and a masonry or SDS bit, because standard drills struggle with reinforced concrete and the drilling raises fine, sharp dust that is worth covering the floor for. Nylon plugs with the correct screw work for most fittings; for anything heavier than around five kilograms, a metal expansion plug holds better.

The one snag in panel buildings is hitting the internal steel reinforcement or an embedded electrical conduit, both of which run in fairly predictable patterns but are worth checking for with a detector before drilling near a wall edge or an existing cable route.

Suspended plasterboard ceiling: the weight has to go into the frame, not the board

Plasterboard on its own holds almost nothing. A standard fitting screwed straight into the board with no other support will eventually pull free, sometimes within weeks, sometimes after a slammed door shakes it loose. The board is a lining, not a structural surface.

What plasterboard is fixed to is what matters: either a metal C- or U-profile frame, or timber battens, spaced at regular intervals below the real ceiling. A light fitting needs to land on one of those, found by tapping for the denser sound or with a stud detector, or it needs its own fixing point built in before the plasterboard went up.

For anything beyond a very light flush fitting, the safer answer is a metal toggle or cavity anchor rated for the fitting's weight, screwed through the board into open space where it spreads load behind the surface. Heavier fittings do better hung from a batten or a dedicated ceiling rose fixed through to the structural slab above during installation, which is something to plan for before the plasterboard goes up, not after.

• Tap across the ceiling to find the frame or battens behind the board
• Light flush fittings: cavity anchors rated for the fitting's weight are usually enough
• Chandeliers or multi-arm fittings: fix into the frame or batten, not the board alone
• If the ceiling was installed without a fixing point planned in, that has to be added before the fitting goes up
• Ask an installer if a ceiling was fitted before you moved in and you are not sure what is behind it

Old lath-and-plaster ceilings in wooden houses: delicate, but not impossible

Lath-and-plaster is a thin skin: strips of wood nailed across the joists with gaps between them, and a layer of lime or gypsum plaster keyed into those gaps. It was never designed to carry weight itself, and drilling into it carelessly can crack a much wider area than the hole you meant to make.

The fixing needs to reach the joist above, not just the plaster, which means locating the joist first, usually by tapping along a line and listening for where the sound turns solid, or by checking from the room above or the attic if there is access. Screwing into a joist through the plaster with a pilot hole gives a genuinely strong fixing.

If the joist does not line up with where the fitting needs to sit, a batten fixed across two joists behind the plaster gives you a fixing point in the right place, but that means opening the ceiling locally, which in an old house is worth having someone experienced do, partly to avoid unnecessary damage to plaster that is often original to the building.

What to do yourself and when it is worth calling someone in

Swapping a light fitting on an existing fixing point, in any of the three ceiling types, is often manageable yourself if the wiring underneath is straightforward and you switch off the circuit first. Finding the frame in a plasterboard ceiling, or the joist behind old plaster, is also something a careful person with a stud detector and some patience can do.

Where it stops being a confident DIY job is anything involving the wiring itself, a new fixing point that was not there before, or a ceiling where you genuinely cannot tell what is holding what up. Wiring work should be done by a qualified electrician regardless of how simple it looks, both for safety and because faults are harder to trace later.

Light fitting installation starts from 40 € per job when the fixing point and wiring are already in place, and electrical work more broadly is charged from 49 € per hour when a new circuit, a new point, or diagnosis is needed. Either way, knowing which of the three ceilings you actually have is most of the decision made before anyone picks up a drill.