What size Christmas tree do I need? A height, width and ceiling guide

Last updated: 12 November 2026

A Christmas tree that is too tall bends against the ceiling, and one that is too wide swallows the room. Both problems are easy to avoid with a tape measure and five minutes before you order. This guide covers height, width, where to stand the tree and the small allowances people forget: the stand, the topper and the space to walk past.

Start with the ceiling

Measure from the floor to the ceiling in the exact spot where the tree will stand. Do not rely on a figure from memory or from another room: ceilings vary a lot from one home to the next, and even between rooms in the same house. As a reference point, the government's nationally described space standard for new homes in England sets a minimum floor-to-ceiling height of 2.3 m across at least 75% of the floor area. Plenty of homes are higher than that, and loft rooms and cottages can be lower.

Once you have your figure, subtract about 30 cm. This is our rule of thumb: roughly 20 cm for a star or other topper and 10 cm of clear air so that the top of the tree is not pressed against the ceiling. What is left is the tallest tree to consider.

The British Christmas Tree Growers Association gives the same advice for real trees: measure the height of your ceiling and your floor space before you shop, and allow enough room for a decoration on top and for the stand.

Tree height and ceiling height at a glance

Artificial trees in the UK are usually sold by height in feet. The table converts each size to centimetres and adds the 30 cm allowance.

One foot is 30.48 cm; figures are rounded to the nearest centimetre. The allowance is a rule of thumb, not a standard: a flat tree-top bow needs less room than a tall star.

So in a room with a ceiling of exactly 2.3 m, a 6 ft tree fits comfortably and a 7 ft tree does not. If your ceiling measures 2.4 m, a 7 ft tree will only fit without a topper, which is a good reason to choose 6 ft or 6.5 ft instead. Our Christmas tree calculator runs the same sum for any height, in feet or centimetres.

What the stated height includes

For artificial trees, check on the product page whether the height includes the stand; where it does, no extra allowance is needed at the bottom. A real tree is different. Its trunk sits inside a water-holding stand and, according to the British Christmas Tree Growers Association, about half an inch should be cut from the base before it goes up, so its finished height changes a little once it is standing.

Width and floor space

Height gets all the attention, but width is what makes a tree feel too big. Every tree in our Christmas Trees department lists the diameter at its widest point, which is near the base. As a rough rule, expect a full-shaped tree to be a little over half as wide as it is tall, so a 6 ft tree can easily measure more than a metre across. Slim trees are far narrower for the same height.

Mark the diameter on the floor with a tape measure before you decide. Then check three things:

• Walking space. You should be able to pass without brushing the branches, and doors should open fully.
• Space for presents. Parcels spread outwards from the base, so leave some floor in front.
• Space for a skirt. A tree skirt is normally a little wider than the stand and a little narrower than the lowest branches. Our rule of thumb is about 18 cm of skirt diameter for every foot of tree, or roughly 110 cm for a 6 ft tree.

Where to stand the tree

London Fire Brigade advises positioning a Christmas tree away from heat sources such as fireplaces and heat vents, away from candles and other open flames, in a sturdy stand so that children or pets cannot topple it, and somewhere that does not block an escape route. In practice that rules out the spot in front of the fire and the narrow end of the hallway.

Think about the socket too. Electrical Safety First says it is best not to rely on extension leads or adaptors if you can avoid it, so a corner near a wall socket is the simplest home for a tree with lights. If the tree stands in a window, check that the curtains still close and hang clear of the branches.

Choosing a shape for the space

• Full trees have the classic wide, layered outline and need a generous corner.
• Slim trees give the same height in a much smaller footprint, which suits alcoves, hallways and flats.
• Tabletop trees stand on a sideboard, desk or windowsill. Measure from the top of the furniture to the ceiling, not from the floor.
• Pre-lit trees arrive with the lights already fitted, which saves the job of winding lights on, though you will still want the tree within reach of a socket.

A taller tree also needs more to dress it. Lights, baubles and tinsel all scale with height; our guide to how many lights a Christmas tree needs sets out the numbers.

If you are buying a real tree

We sell artificial trees, but the measuring is the same for a real one. The British Christmas Tree Growers Association recommends cutting half an inch from the base of the trunk before you display the tree, using a stand that holds water, keeping it topped up, and standing the tree away from radiators and other sources of heat. It says a well looked after tree should last up to four weeks. London Fire Brigade adds a note of caution: a real tree stays relatively safe for about two weeks, after which it is likely to become more flammable, so keep the water topped up and the tree away from heat.

A tree for more than one Christmas

An artificial tree is something you buy to keep. The Carbon Trust notes that an artificial tree used over multiple years, 7 to 20 depending on its weight and materials, is better for reducing emissions than buying a new, commercially grown tree every year. That makes size worth getting right the first time: choose for the room you have, store the tree in its box or a storage bag somewhere dry, and it should serve for many winters.

A five-minute checklist

1. Measure the ceiling in the exact spot, and subtract about 30 cm.
2. Measure the floor and mark out the tree's diameter.
3. Check the surroundings: no fire, radiator or doorway in the way, and a socket within reach.
4. Read the product page for the height, the base diameter and whether the stand is included in the height.
5. Plan the dressing with the Christmas tree calculator.

If the tree you choose turns out to be wrong for the room, it can come back to us at no cost during the 30 days after delivery, provided it is unused and still in its original packaging; the steps are on our Returns & refunds page. And if you are ordering for December, our Christmas delivery dates page explains how long delivery takes.

Sources

• GOV.UK: Technical housing standards – nationally described space standard
• British Christmas Tree Growers Association: Information for buyers
• British Christmas Tree Growers Association: How to care for your tree
• London Fire Brigade: Christmas trees
• Electrical Safety First: Christmas lights
• The Carbon Trust's tips for a more sustainable Christmas