How To Install Spotlights
A step-by-step guide to planning and fitting ceiling spotlights based on a renovation where we fitted them throughout.
The short answer
To install spotlights, plan roughly one light per square metre set at least half a metre from the walls, find the joists and mark a grid on the ceiling with a chalk line. Cut each opening with a hole saw sized to the fitting, run lighting cable from an existing circuit with the power isolated, connect each light and push it up on its spring clips.
Swapping a single pendant for a ceiling full of spotlights changes how a room feels, giving even light across the whole space with no dark corners. Most of the work is careful planning and measuring, and none of it is complicated.
On a recent renovation, we put spotlights in every bedroom and fitted 26 in the kitchen, which you can see part way through the job in our lead photo. The method below is what we followed, and it works just the same for standard LED downlights as for smart ones you control from your phone.
Electrical Safety Before You Start
Spotlights connect to your home's lighting circuit, so the electrical side needs to be done properly. Always switch off the lighting circuit at the consumer unit and check the cables are dead with a voltage tester before touching any wiring.
In England, adding lights to an existing lighting circuit in a room like a kitchen or bedroom isn't notifiable under Part P of the Building Regulations, but the work must still meet the wiring regulations. Wales has stricter rules, with work in kitchens also notifiable. A new circuit, or any work in a bathroom near the bath or shower, is notifiable and needs a registered electrician or building control sign-off. If you're not confident with the connections, you can do the planning, marking and cutting yourself and have an electrician wire them in.
Tools And Materials You'll Need
- Tape measure and pencil
- Chalk line
- Stud finder or a bradawl
- Cordless drill
- Hole saw matched to your spotlights' cut-out size
- Voltage tester
- Wire strippers and screwdrivers
- Lighting cable and junction boxes or connectors
- Spotlights, fire-rated where there's a room above
- Step ladder or platform
- Dust mask and safety glasses
What's Above The Ceiling
Your route for the cables depends on what's on the other side of the plasterboard. Below a loft, you can get up there and feed the cable across to each hole from above, which makes the whole job far simpler. Move any loft insulation back from where each light will sit and follow the manufacturer's guidance on clearance before laying it back.
With a room above, the floorboards up there need lifting to run cables between the joists. That can mean taking up carpet or other flooring first, so it's worth combining with any work you have planned upstairs. If the boards are up anyway, it's the ideal moment for the jobs covered in our guide to floor insulation between the joists.
How To Install Spotlights Step By Step
1. Work Out How Many Spotlights You Need
Too few spotlights leave patches of shadow, while too many make the ceiling look cluttered. A good rule of thumb is one spotlight per square metre of floor, with every light at least half a metre from the walls. In a 4 x 3 metre room that works out at around 12 lights, set out as three rows of four.
2. Find The Joists
Before marking any positions, find where the ceiling joists run, as a hole saw won't go through timber and you don't want a light landing on one. A stud finder shows you their line without making a mark. A bradawl pushed through the ceiling works too, but leaves holes to fill afterwards with a decorator's filler from our pick of the best wall fillers.
3. Mark Out The Grid With A Chalk Line
A chalk line is the quickest and cheapest way to get a straight, even layout. Measure the room's length and width and divide each by the number of lights in that direction, so the gaps between lights are equal and the end lights sit half a gap from the walls. Snap a line along each row, and the lights go where the lines cross.
For two rows of three lights, for example, you'd snap two lines one way and three lines the other, giving six crossing points. Check the distances between each crossing with a tape before cutting anything, and shift any that land on a joist.
4. Check The Cut-Out Size
Every spotlight lists a cut-out diameter in millimetres on the box or in its instructions. Buy a hole saw that matches it exactly, as a hole that's too big leaves a gap the bezel won't cover and one that's too small won't let the fitting through.
5. Cut The Holes With A Hole Saw
Fit the hole saw to a cordless drill and line the pilot bit up with the point where the chalk lines cross. Hold the drill square to the ceiling and let the saw cut through the plasterboard steadily, without forcing it. Wear safety glasses and a dust mask, and sheet the floor below, as the dust comes straight down.
Take extra care with an Artex or other textured ceiling, as some contain asbestos. Before we cut into ours, we sent a sample off for testing and it came back clear. If yours hasn't been tested, do that before drilling, and leave it to a licensed contractor if the result is positive.
6. Run The Cable And Wire Each Light
With the circuit isolated and tested dead, run lighting cable from the existing circuit to the first hole, then on to each light in turn. You can daisy chain the lights, going in and out of each one, or run each light from a junction box. Most LED spotlights come with a connector block or driver, so follow the wiring diagram supplied and make sure every earth is connected.
7. Test And Push The Spotlights Into Place
Before pushing anything up into the ceiling, switch the circuit back on and check every light works from the switch. Then turn the power off again, fold the cable neatly into the void and push each fitting up. Most spotlights hold in place with spring clips that flip over the top of the plasterboard and grip it tight.
Choosing The Right Spotlights For Each Room
The fittings you buy matter as much as how they're fitted. LED spotlights use far less electricity than halogen and run much cooler, so they're the obvious choice for a new installation.
Where there's a bedroom or any room above, use fire-rated downlights. A hole in the plasterboard weakens the ceiling's fire resistance, and fire-rated fittings are designed to restore it. In a bathroom, you also need lights with the right IP rating for the zone they sit in, which our guide to the best bathroom lighting explains in detail.
If you want dimmable lights, check the bulbs or fittings are dimmable and that your dimmer switch is LED compatible, or the lights will flicker and buzz.
Finishing Off The Ceiling
Once the lights are in, fill any bradawl holes and dents from the ladder, then sand them smooth. A fresh coat of a good ceiling emulsion from our roundup of the best emulsion paints hides the filler and any chalk line marks that have dusted onto the paint.
Is Fitting Spotlights A DIY Job
Planning, marking out and cutting the holes are well within reach of a competent DIYer, and they take up most of the time on the job. It's the wiring that needs more care. If you've already done jobs like changing a plug socket and you understand isolating and testing a circuit, connecting spotlights to an existing lighting circuit is a similar level of work.
If not, there's no shame in doing the prep yourself and booking an electrician for an hour to make the final connections and test everything.
Quick Questions And Answers
How many spotlights do I need in a room?
A good starting point is one spotlight per square metre of floor area, spaced evenly and kept at least half a metre from the walls. A 3 x 3 metre bedroom would take around nine lights in three rows of three. Kitchens and bathrooms benefit from a few more over worktops and the basin, while a bedroom can manage with fewer if you add lamps.
Do I need an electrician to install spotlights?
You don't legally need an electrician to add spotlights to an existing lighting circuit in a room such as a kitchen or bedroom in England, as long as the work meets the wiring regulations. In Wales, kitchen work is also notifiable. A new circuit, or lighting work in a bathroom near the bath or shower, is notifiable under Part P and needs a registered electrician or building control approval.
Do ceiling spotlights need to be fire rated?
Ceiling spotlights need to be fire rated wherever there's a habitable room above, such as a bedroom over a kitchen. Cutting holes in the plasterboard weakens its fire resistance, and fire-rated downlights are designed to restore it. Below a loft with no room above, standard fittings are acceptable, though plenty of people fit fire-rated ones throughout to keep things simple.
Can you put spotlights in an Artex ceiling?
Yes, you can fit spotlights in an Artex ceiling, but get it tested for asbestos first, as some older textured coatings contain it. Test kits let you send a small sample to a lab. If the result is clear, cut the holes with a hole saw while wearing a dust mask. If asbestos is present, use a licensed contractor rather than drilling it yourself.
How do I stop a spotlight landing on a joist?
Find where the ceiling joists run before you mark any positions, because a hole saw won't cut through timber. A stud finder shows the line without leaving a mark. A bradawl pushed through the ceiling works too, but leaves holes to fill afterwards. Once your grid is marked, check each crossing and shift any that land on a joist.
What size hole saw do I need for spotlights?
Buy a hole saw that matches the cut-out diameter listed on the spotlight's box or instructions exactly. A hole that's too big leaves a gap the bezel won't cover, and one that's too small won't let the fitting through. Hold the drill square to the ceiling and let the saw cut steadily, wearing safety glasses and a dust mask.
What's the easiest way to lay out a straight row of spotlights?
A chalk line is the quickest and cheapest way. Divide the room's length and width by the number of lights in each direction so the gaps are equal and the end lights sit half a gap from the walls. Snap a line along each row, and the lights go where the lines cross. Check the distances with a tape before cutting.
Is it easier to fit spotlights under a loft or under a bedroom?
Fitting them under a loft is easier, because you can get up there and feed the cable across to each hole from above. Move the loft insulation back from each light and follow the manufacturer's clearance guidance. With a room above, you have to lift the floorboards to run cable between the joists, so combine it with any upstairs work.
Dave, or Demolition Dave as the team calls him, worked as a builder for over 10 years before joining DIY Works. He now concentrates on his own properties and writes most of our construction content, along with tools, carpentry and plenty more.