How to plan architectural lighting during a renovation

Lighting is the electrical work you notice every day, and the part most often decided too late. By the time a room is plastered, moving a light means cutting into a finished ceiling. These are the decisions worth making before first fix.

1. Think in layers, not grids

A grid of downlights lights the floor evenly and the room badly. Good lighting usually combines:

• Ambient light for general use, often indirect: wall lights, coves, uplights
• Task light where you do things: worktops, desks, reading chairs, mirrors
• Accent light on surfaces and objects: artwork, joinery, stone, planting outside the window
• Decorative fittings: pendants and lamps that are part of the interior

Each layer on its own circuit lets you set the room for different times of day.

2. Start from the furniture plan

Set out lights from where the table, island, sofa, bed and artwork will be, not from the centre of the ceiling. A pendant over a dining table is only right if the table is where you think it is.

3. Check the ceiling before you choose fittings

• Joist direction and depth decide where recessed fittings can go.
• Fire separation: cutting holes in a ceiling between floors can compromise it. The fitting and method need to maintain it.
• Insulation: in a top-floor ceiling, fittings must suit contact with, or clearance from, loft insulation.
• Acoustic ceilings and lowered sections may be needed for some details.

4. Plan the LED details

Linear LED in joinery, plinths, shelving, stair treads and shadow gaps can transform a space. It needs:

• a recess or profile designed into the joinery
• a driver in a location that can be reached later (not sealed behind a kitchen carcass)
• a cable route from the driver to the tape, and from the driver to the switching

5. Make dimming work

Most flicker and buzzing complaints come from mismatched dimmers, drivers and lamps. Choose fittings, drivers and dimmers as a system, and check the dimming protocol (leading edge, trailing edge, DALI, 0-10V or a control system) before ordering.

6. Decide on control early

Conventional switching, smart dimmers or a whole-house lighting control system all need different wiring. Lighting control usually means cables from each circuit back to a central location and keypads instead of banks of switches. That decision needs to be made before first fix.

7. Keep colour consistent

Pick a colour temperature (often 2700K in living spaces) and stick to it across the scheme. Look for good colour rendering (CRI 90 or above is a common target for interiors) so materials and skin tones look right.

8. Don’t forget the outside

Lighting the garden extends the view from inside at night and removes the black-mirror effect of large glazing. Ducts laid before landscaping make it easy. See outdoor and garden lighting.

If you are planning a renovation in Harrogate, York or Wetherby, see lighting installation and architectural lighting.