What IP rating does a pergola pendant light need?
Any pergola pendant must carry at least IP44 because rain and condensation reach the fitting even under a covered roof in exposed UK gardens.
A pergola is not a sealed room. Wind-driven rain, splashing from nearby hosepipes and overnight condensation all reach the fitting, so BS 7671 treats the zone as damp. Specify IP44 as the absolute minimum for any outdoor pendant lights installed under a pergola roof, and IP65 if the structure is open-sided or close to a hot tub or pool.
The circuit matters as much as the fitting. Outdoor lighting should be fed from an RCD-protected way at the consumer unit, and if the installation is more than a few years old it is sensible to have it inspected — an Electrical Installation Condition Report confirms the earthing and protective devices are up to standard before you add load.
Check three things on the spec sheet:
- IP44 minimum, IP65 for exposed or open-sided pergolas
- Class II (double-insulated) construction where possible
- A terminal box or gland rated to the same IP level as the fitting
A fitting rated IP44 with a standard indoor flex connector underneath is the most common failure point we see on site.
What size pendant suits a pergola, and how low should it hang?
Size the pendant so its diameter is roughly one-third of the pergola's width and hang it 2.1 metres above the floor for clear headroom.
Scale the fitting to the structure, not the garden. A 29cm pendant like the Terba range suits a 2.5–3 metre square pergola over a dining table; anything wider than 4 metres needs a 45cm+ diameter or a pair of fittings. Over a table you can drop lower — 75–90cm above the table surface puts light where it is useful without blocking sightlines across the table.
In walk-through zones, keep the lowest edge of the shade at 2.1 metres above ground level so adults pass underneath without ducking. Pergolas under 2.5 metres in height generally rule out pendant drops altogether; in that case use a flush or semi-flush fitting instead.
Planning permission is rarely required for garden lighting, but the Planning Portal guidance on lighting confirms the exceptions — notably listed buildings and some conservation areas — so check before drilling into a permanent structure.
Fix the canopy to a treated timber bearer or a masonry pad stone rather than straight into softwood decking boards, and use stainless fixings throughout.
What colour temperature works best over a pergola table?
Warm 2700K lamps suit pergola dining, while 3000K works better for cooking zones; always choose dimmable, warm-white lamps for evening use.
Colour temperature decides whether the space gets used after dark. Over a dining table, 2700K warm white flatters food and skin tones and keeps the light from spilling harshly into neighbouring gardens. If the pergola sits beside an outdoor kitchen or BBQ zone, 3000K gives better colour rendering for prep work — mixing the two on separate switches is standard practice on the jobs we specify.
CRI matters as much as Kelvin. Choose lamps with a CRI of 80 or higher so timber, foliage and upholstery read naturally rather than grey. Dimmable GU10 or E27 lamps paired with an outdoor-rated dimmer give you full control from bright supper lighting down to a low glow for late evenings.
Practical lamp choices:
- 2700K, CRI 80+, dimmable E27 filament LED for dining zones
- 3000K GU10 LED, 35° beam, for cooking or bar areas
- 5W–7W per lamp is usually sufficient under a dark roof
Avoid cool 4000K lamps entirely — they make timber pergolas look institutional and attract more insects to the table.
Which materials survive UK weather on a pergola?
Materials matter more than style outdoors: powder-coated aluminium, marine-grade stainless steel and UV-stable glass resist corrosion and fading.
Outdoor fittings fail at the material, not the design. Powder-coated aluminium is the default choice — it is light, does not rust, and the coating handles UV exposure for years. Marine-grade 316 stainless steel suits coastal sites within a few miles of the sea, where 304 stainless and plated steel pit within two seasons. Avoid bare copper and brass near acacia or cedar timber; the runoff stains wood permanently.
Glass shades should be toughened and UV-stable. Ribbed or textured glass hides water spotting far better than polished clear glass, which is why the Nordfor ribbed-glass pendant holds its appearance with minimal cleaning. Rattan, untreated wicker and most fabric shades have no place outdoors regardless of how sheltered the pergola seems.
Materials checklist:
- Powder-coated aluminium body, minimum 60μm coating
- 316 stainless fixings, chains and hooks
- Toughened, UV-stable glass or polycarbonate diffusers
- Silicone-sealed cable glands, not push-fit grommets
Expect to clean the fitting twice a year — a damp cloth and mild detergent, no pressure washer — and re-check the gland seals annually.