Size a stairwell chandelier against the void, not the room. Measure the vertical drop from the ceiling plane to the floor below, the narrowest width of the void, and the headroom over the top treads. Then keep the lowest point of the fixture at least 2.1 m (6 ft 11 in) above any walking surface.
Measure the void before you choose a fixture
A stairwell fixture is sized against three measurements and none of them is the room. The first is vertical drop, taken from the ceiling plane where the fixture will be fixed down to the floor of the lower level, because that distance sets the total hanging height available to the fixture. The second is the narrowest width of the void, measured between the stringer or balustrade on one side and the opposite wall, because a chandelier wider than that clearance can be struck from the stairs. The third is headroom, taken over the walking surface at the top landing and again at the point where somebody carries a box up the treads. Record all three in millimetres and in feet and inches, photograph the void from both floors, and confirm where the structural ceiling is before ordering. None of this step needs a fixture present, so finish it before shortlisting a model; 2.1 m (6 ft 11 in) is the clearance figure the drop budget is tested against.
| Measurement | Where to take it | What it decides |
|---|---|---|
| Vertical drop | Ceiling plane down to the lower floor | Total hanging height the fixture may use |
| Narrowest void width | Stringer or balustrade to opposite wall | Maximum safe fixture diameter |
| Headroom at the top landing | Upper floor surface to the fixture's lowest point | Whether the drop budget has to shrink |
| Headroom over the treads | Nosing line to the fixture's lowest point | Whether the fixture fouls somebody climbing |
How to size the fixture against the void
The convention designers repeat is that a stairwell fixture spans one third to one half of the narrowest void width. A void 1.8 m (5 ft 11 in) wide therefore takes a fixture from 600 mm (23.6 in) to 900 mm (35.4 in) across, and a void 3 m (9 ft 10 in) wide takes 1 m (39.4 in) to 1.5 m (59.1 in). Treat the lower third of that range as the floor and the upper half as a comfortable statement, because a fixture that fills more than half the opening starts to block the view up the stair. The widely repeated foyer formula, where the length plus the width of the space in feet gives the diameter in inches, assumes an enclosed rectangular foyer with four walls; an open stairwell void has no enclosed width to add, so use the third-to-half range instead. Leave at least 900 mm (36 in) of clear air between the fixture's widest point and the handrail.
| Void width at its narrowest | One third (floor of range) | One half (statement) |
|---|---|---|
| 1.2 m (3 ft 11 in) | 400 mm (15.7 in) | 600 mm (23.6 in) |
| 1.8 m (5 ft 11 in) | 600 mm (23.6 in) | 900 mm (35.4 in) |
| 2.4 m (7 ft 10 in) | 800 mm (31.5 in) | 1.2 m (47.2 in) |
| 3.0 m (9 ft 10 in) | 1 m (39.4 in) | 1.5 m (59.1 in) |
How much drop a two-storey void allows
Drop is a subtraction, and it is done twice for a stairwell because the fixture is read from two floors. Take the void height from the lower floor to the ceiling plane, subtract the 2.1 m (6 ft 11 in) walking clearance, and what remains is the budget for the fixture body plus its chain, rod or cord plus the canopy. A void 5.49 m (18 ft) tall leaves 3.39 m (11 ft 1 in) of drop, a 6.10 m (20 ft) void leaves 4.00 m (13 ft 1 in), a 6.71 m (22 ft) void leaves 4.61 m (15 ft 1 in), and a 7.62 m (25 ft) void leaves 5.52 m (18 ft 1 in). Then check the second reading: from the upper floor, the fixture's lowest point should still sit at least 2.1 m (6 ft 11 in) above the lower floor it hangs over, and nobody standing on the top tread should meet it at eye level.
| Void height over the lower floor | Walking clearance kept | Longest hang available |
|---|---|---|
| 5.49 m (18 ft) | 2.1 m (6 ft 11 in) | 3.39 m (11 ft 1 in) |
| 6.10 m (20 ft) | 2.1 m (6 ft 11 in) | 4.00 m (13 ft 1 in) |
| 6.71 m (22 ft) | 2.1 m (6 ft 11 in) | 4.61 m (15 ft 1 in) |
| 7.62 m (25 ft) | 2.1 m (6 ft 11 in) | 5.52 m (18 ft 1 in) |
The clearance figure is the convention here; each longest-hang figure is arithmetic from the two columns to its left.
Fixture height and total hanging height are different figures
In the catalogue exported on 9 October 2026 there are 1,046 models and 7,355 variants, and 142 of those models carry stairwell or staircase in the product title. Of the 142, twenty-seven state a machine-readable diameter in a variant name, which gives 146 variants inside our 15 cm to 300 cm sanity window. Those 146 stated diameters run from 30 cm (11.8 in) to 200 cm (78.7 in) with a median of 100 cm (39.4 in). Ninety-eight of the same variants also state a height figure, and the median of those stated heights is 220 cm (86.6 in), which is taller than any plausible fixture body. That gap is the reason to separate the two numbers: body height is the fixed object, total hanging height is the body plus chain, rod or cord plus canopy, and only the second one meets your drop budget. Six models in the range are named extended-drop. What each of those three figures actually measures is set out in chandelier height versus total hanging height.
What we stock for stairwells and what it costs
Prices across the 146 stairwell and staircase variants inside the sanity window run from $520 to $12,883 with a median of $2,883, so the band suits a tall void rather than a casual purchase. Diameters are spread evenly across the range: 41 of the 146 variants state under 80 cm (31.5 in), 55 state 80 cm to 120 cm (31.5 in to 47.2 in), and 50 state 120 cm (47.2 in) or more, which means the range is not weighted towards small pieces the way a dining or bedroom selection is. Only 27 of the 142 stairwell models give a readable diameter at all, so the practical first step is to filter by void width and then ask for a dimensioned drawing of the specific model, because a variant name is a supplier label rather than a measured survey. Pieces that already carry a long drop are grouped in the stairwell chandelier collection .
| Stated diameter band | Stairwell variants | Share of 146 |
|---|---|---|
| Under 80 cm (31.5 in) | 41 | 28.1 per cent |
| 80–119.99 cm (31.5–47.2 in) | 55 | 37.7 per cent |
| 120 cm (47.2 in) and above | 50 | 34.2 per cent |
| All stairwell variants | 146 | 100 per cent |
The staircase chandelier collection is filtered to this group, and the guide to sizing a chandelier for a double-height space sets out the same arithmetic for a closed void.
When a stairwell chandelier is not the right choice
Skip it when the void cannot give the fixture a clear 2.1 m (6 ft 11 in) above the lower floor without hanging the body into the walking line, because lowering the clearance to fit a larger piece is the wrong trade. Skip it when the narrowest void width minus 900 mm (36 in) of handrail clearance leaves less than a 400 mm (15.7 in) fixture, since a piece that small reads as a lamp rather than as stairwell lighting. Skip a pendant on a vaulted or sloped stairwell ceiling unless the canopy is rated for that pitch, and skip any heavy fixture until the ceiling box and its support have been assessed on site, because a drywall box is not a fixing point. What a pitched ceiling changes about the fixture side of that junction is set out in can a chandelier be installed on a sloped or vaulted ceiling. The load question is set out in what a large crystal chandelier weighs and what a ceiling has to carry, and the entry-level version of this arithmetic sits in the foyer chandelier size guide.
Two further checks are worth making before the deposit. If the void is glazed on one or two sides, look at the fixture against the daylight rather than against the evening interior, because a pale glass body can disappear against a bright window. And if the void also carries the main entrance door, keep the fixture outside the swing of that door.
Numbers and sources
Every figure above belongs to one of three groups. The catalogue figures, meaning 1,046 models, 7,355 variants, the 142 stairwell and staircase titles, the 27 models with a readable diameter, the 146 in-window variants, the stated diameter range of 30 cm to 200 cm with a median of 100 cm, the 98 variants carrying a height figure with a median stated height of 220 cm, the six extended-drop models, the price range of $520 to $12,883 with a median of $2,883 and the band counts of 41, 55 and 50, all come from our own Shopify catalogue export of 9 October 2026 and were recomputed mechanically from that file. The ergonomic figures, meaning the 2.1 m (6 ft 11 in) clearance, the one-third-to-one-half range, the 900 mm (36 in) handrail clearance and the foyer length-plus-width formula, are trade conventions, not standards, and no measurement of ours sits behind them. Converted units are arithmetic at 25.4 mm to the inch and 304.8 mm to the foot.
| Figure | Value | Source | Nature |
|---|---|---|---|
| Catalogue size | 1,046 models / 7,355 variants | Shopify catalogue export, 9 October 2026 | First-party, recomputed |
| Stairwell titles | 142 of 1,046 models | Same export, product titles | First-party, text search |
| Stated diameters | 146 variants, 30–200 cm, median 100 cm | Same export, variant names | First-party, recomputed |
| Stated heights | 98 variants, median 220 cm | Same export, variant names | First-party, recomputed |
| Price band | $520 to $12,883, median $2,883 | Same export, variant prices | First-party, recomputed |
| Walking clearance | 2.1 m (6 ft 11 in) | Trade convention | Not a standard, not measured here |
| Fixture against void | One third to one half of void width | Trade convention | Not a standard, not measured here |
| Handrail clearance | 900 mm (36 in) | Trade convention | Not a standard, not measured here |
| Foyer formula | Length plus width in feet = diameter in inches | Trade convention | Applies to enclosed foyers only |
| Unit conversions | 25.4 mm per inch, 304.8 mm per foot | Arithmetic | Definitional |
Nothing here guarantees a delivered appearance, a light level or a place in search results. Structural and electrical work belongs to a qualified electrician on site, and the conventions above are design guidance rather than a substitute for that advice.