A double pole carries two rails on one set of brackets — a sheer or voile on the inner rail, the main curtain on the outer. It is the simplest way to get daytime privacy without giving up light, and warmth at night.
Why layer at all
Daytime privacy with light. A voile softens the view in without blocking daylight — the main reason most people fit one, particularly on ground-floor rooms facing a street.
Better insulation. Two layers trap more air against the glass than one.
Light control through the day. Sheer closed in the morning, main curtains closed at night, both open when you want the view.
It looks more finished. Layered windows read as considered rather than functional.
The spacing detail people miss
The gap between the two rails is the setting that decides whether a double pole works well.
Too close and the front curtain presses against the sheer, so neither hangs properly and both wear along the contact line. Too far and the assembly projects awkwardly from the wall and may foul a sill or radiator.
Check two dimensions before ordering: the gap between rails (enough that a pleated main curtain clears the sheer — remember pleats add depth), and the total projection from the wall to the outer rail, against your sill, radiator and any window opener.
Weight and support
Two sets of curtains is more load than one, carried on the same brackets. Treat a double pole as you would a heavier single: go up a diameter if in doubt, and add a centre bracket beyond about 200cm.
Fix into masonry or timber studs — never plasterboard alone. See How to Hang Heavy Curtains Safely.
Choosing the two fabrics
The sheer does the light work, so keep it light — voile, muslin or a fine linen. Heavy "sheers" defeat the purpose and add unnecessary load.
The main curtain can be whatever the room needs: lined for a living room, blackout or thermal for a bedroom. Our guide to choosing curtain linings covers the options.
Most people match the finish across both rails so the hardware reads as one piece.
The alternative
If you want the layered effect but a double pole projects too far, a slim track for the sheer fitted inside the recess with a pole on the face of the wall achieves the same thing and often looks neater. It is two separate installations rather than one, so it costs more.
Where to look
Browse Extendable & Double Poles, or tell us your window dimensions and we will confirm the projection you need.