Orange is a confident colour, so the trick is pairing it with shades that either balance its energy or quieten the room down. Three routes work, mate.
Go complementary with deep blue. Orange and blue sit directly opposite on the colour wheel, which is exactly why they look so good together. A rich navy like Dulux Sapphire Springs 1 (LRV 6.4) is properly dramatic against a warm orange — think a feature wall, joinery, or the lower half of a panelled room. The depth of that blue makes the orange feel deliberate rather than accidental. Use it on woodwork, a chimney breast, or built-in shelving and you've got a scheme with real backbone.
Tone it down with a softer terracotta or rust. If your orange is reading too hot, ground it with a more muted, brick-toned shade. Farrow & Ball Lobster (LRV 33) is a warm, earthy red-orange that bridges nicely — it lets you build a tonal, layered scheme rather than fighting the existing colour. This is the move for a cosy snug or dining room where you want warmth without glare.
Calm it with a warm off-white. Orange needs breathing room, and a soft chalky white on the ceiling, trim and adjacent walls stops it overwhelming the space. Paper III from Paint & Paper Library (LRV 75.3) is a gentle, warm-leaning white that won't go cold and clinical next to all that warmth — cool brilliant whites tend to look harsh beside orange, so steer clear of those.
The "but what about green?" question comes up a lot. Yes, an olive or earthy green works too — it's nature's own orange-and-green pairing — but it's trickier to balance, so I'd master one of the three above first.
Practical tip: orange bounces a lot of warm light around a room, so test your pairing colours on the actual orange wall in both daylight and lamplight. What looks balanced at noon can go muddy by evening.