Lighting Installation and Replacement Guide Scope of Works Survey & isolate power – test circuits, confirm switch location and ceiling joist position. Remov...
Lighting work in a UK home — installing new fittings, replacing pendants with downlights, adding circuits to a kitchen island, or wiring smart switches — typically costs £60–£250 per light point, depending on whether it's a like-for-like swap, a new tap-off the existing circuit, or a new circuit run from the consumer unit.
Like-for-like replacements (changing a pendant to a different pendant) are the cheapest. Adding a new light position to an existing room means chasing cables, channelling plaster and patching back — that's where the cost climbs.
Typical UK costs
| Job | Typical price |
|---|---|
| Like-for-like pendant swap | £40–£90 per fitting |
| New downlight (in existing void) | £60–£120 per fitting |
| New downlight (cutting/coring ceiling) | £90–£180 per fitting |
| New light point — chase + patch | £150–£280 per fitting |
| Smart switch / dimmer (replace existing) | £60–£140 per switch |
| Wired LED strip (kitchen plinth or shelf) | £180–£450 per run |
| Outdoor / garden light point | £140–£320 per fitting |
| New lighting circuit (e.g. for extension) | £250–£500 + per-fitting cost |
Common lighting projects
- Replace pendants with downlights — typical 4-pendant living room becomes 6–8 downlights. Allow £600–£1,200 fitted, plus making good and decoration.
- Kitchen island lights — usually a single new circuit on a 3-pendant cluster. £300–£600 if cabling can be run in the ceiling; more if walls or floors need to be lifted.
- Under-cabinet kitchen lighting — LED strips or pucks under wall units. £200–£500 fitted including transformer and switch.
- Outdoor / garden lighting — wall-mounted floods, post lights or in-ground spotlights. From £140 each; a typical garden lighting scheme is £500–£1,500.
- Smart lighting — Hue, Lutron, Loxone, etc. Mix of smart bulbs (DIY) and wired smart switches (professional). A whole-house Lutron retrofit is £1,500–£5,000.
Choosing LED downlights — the key spec
Most lighting work in 2026 specifies LED fittings. Things to get right:
- Colour temperature — 2700K (warm) for living rooms and bedrooms; 3000K for kitchens and bathrooms; 4000K (neutral) for utilities and offices. Stick with one colour temp throughout a room.
- CRI (Colour Rendering Index) — 90+ for living and dining areas (food and skin look right); 80+ for utility spaces. Cheap LEDs at 70 CRI make everything look washed out.
- IP rating — IP65 for bathroom zone 1/2, IP44 minimum elsewhere in bathrooms, IP44+ for outdoor / soffit fittings.
- Dimming compatibility — LEDs need dimmers designed for them (trailing-edge or 0–10V). Old leading-edge dimmers cause flicker and buzzing.
- Fire-rated — downlights cut into a ceiling that forms a fire compartment (ceiling above habitable rooms in flats, or under loft conversion floors) must be fire-rated to maintain compartmentation.
Things people often miss
- Joist locations — ceiling joists run perpendicular to floorboards above; downlights must fit between them. Always survey first; some plans become "we can fit 4 here, not 6".
- Acoustic and fire compartmentation — cutting too many downlights into a ceiling can compromise fire and noise performance, particularly in flats and HMOs. Use IC-rated, fire-rated fittings or intumescent hoods.
- Two-way and three-way switching — controlling a light from two or three positions (top of stairs and bottom, or three bedroom doors) needs the right cabling and switching topology. Easier to plan than retrofit.
- Switch height and position — Building Regs M (Access) requires switches at 900–1200 mm above floor in dwellings; many older houses have switches at 1400 mm+. Worth correcting during a refurb.
- Smart-home pre-wiring — if you might want smart lighting later, run extra neutrals to switch positions during first-fix. Adding neutrals retrospectively is much harder.
Frequently asked questions
Can I replace a light fitting myself?
Like-for-like swap of a pendant or wall light: yes, if you're confident with electrics, isolate the circuit at the consumer unit and follow standard practice. New circuits, new positions, or anything in special locations (bathrooms, kitchens, gardens) is notifiable under Part P and should be done by a registered electrician.
How many downlights does a room need?
Rule of thumb: one downlight per square metre of room area for general lighting, more if it's a task area (kitchen worktop, desk). A 4×5 m living room typically needs 6–8 downlights spaced evenly. Use a layout plan rather than guessing.
Do I need an electrician's certificate?
For any new circuit, consumer unit replacement, or work in special locations (bathroom, kitchen, garden), yes — Part P notification is required and the electrician issues a Building Regulations Compliance Certificate. Like-for-like replacements outside special locations don't need certification.
Why do my LED bulbs flicker on the dimmer?
Almost always a leading-edge dimmer (designed for incandescent or halogen) trying to dim LEDs. Replace with a trailing-edge or LED-compatible dimmer (£15–£30) and the flicker stops. Some cheap LEDs simply aren't dimmable; check the spec.
Can I add downlights without lifting the floor above?
Often yes, if cables can be threaded through the existing ceiling void. The electrician fishes cables between joists. If not — typically ground floor with a void above, or where joists run wrong way — partial floor lifting may be needed.
What's the difference between fire-rated and non-fire-rated downlights?
Fire-rated fittings have intumescent material that expands in heat, sealing the cut hole and maintaining ceiling compartmentation. Required where the ceiling forms a fire boundary (between flats, under loft conversions). Non-fire-rated fittings cost less but are only legal where compartmentation isn't a requirement.
Want a local pro to handle this? A Part P registered electrician will plan the layout, choose the right fittings for each location, and certify the work. Don't skimp on lighting design — it's the single biggest determinant of how a finished room feels.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
