The short answer
Pile height is the length of the grass fibres in millimetres, and for most UK gardens a 30mm to 37mm pile is the sweet spot — long enough to look like a healthy lawn, short enough to stay upright and recover under foot traffic. Shorter piles (20–25mm) are firmer, more hard-wearing and easier to brush, suiting high-traffic areas, dogs, putting-style surfaces and balconies. Longer piles (40mm and above) look lush and soft when new but tend to flatten under regular use and need more brushing to stay standing, so they suit lightly used, decorative lawns. Crucially, the tallest pile is not the most realistic: real lawns are mown short, so an ultra-long pile can look artificial. Match the height to how the area is used rather than picking the longest available.
Pile height is the first spec most people see, and it is easy to assume longer is better. In practice the right choice balances appearance, durability and how the area will be used. Here is how to decide.
Pile height guide
- All-round garden30–37mm
- High traffic / dogs20–30mm
- Decorative, light use40mm+
- Putting / sport15–25mm
- Taller = more realistic?No
What pile height actually means
Pile height is simply the length of the grass blades measured from the backing to the tip, given in millimetres. It is one of several specs — alongside density, weight and fibre type — that together determine how a grass looks and performs. Most artificial grass sold in the UK falls between about 20mm and 45mm.
The instinct is to choose the longest pile for a lush look, but longer fibres are heavier and more prone to lying flat under their own weight and under foot traffic. Once flattened, a long pile needs regular brushing against the grain to stand it back up. Shorter piles are inherently springier and recover faster, which is why busy areas and pet runs use them.
| Pile height | Character | Best suited to |
|---|---|---|
| 15–25mm (short) | Firm, hard-wearing, low | Putting areas, balconies, dogs, heavy traffic |
| 30–37mm (medium) | Natural lawn look, springy | Most family gardens, all-round use |
| 40–45mm (long) | Lush and soft when new | Decorative, lightly used lawns |
Indicative guidance for UK gardens; ranges vary by product.
Matching height to how you use the area
For a typical family lawn used regularly by children and adults, a medium pile around 30mm to 37mm gives the best balance: it reads as a real, healthy lawn, feels comfortable underfoot and bounces back from everyday use. This is the range most installers recommend as a default.
If the area takes heavy traffic — a path of travel, a frequently used play space, or a garden with dogs — lean shorter, around 20mm to 30mm. The firmer surface stands up to wear, drains and dries faster, and is far easier to keep looking tidy. For genuinely sport-like surfaces such as a putting green, shorter piles in the 15mm to 25mm range are used so a ball can roll.
Longer piles of 40mm and above look impressive in a showroom and feel soft, but they are best kept for decorative lawns that are walked on lightly. Under regular family use they flatten, and keeping them upright becomes a chore.
Reading pile height alongside the other specs
Pile height never tells the whole story. A 30mm grass with high density and a good fibre mix can look and perform better than a sparse 40mm one. Two specs to read alongside it are density (how many stitches per area) and face weight (grams of yarn per square metre) — higher figures mean a fuller, more durable surface that holds its shape.
Fibre shape matters too: stiffer, structured fibre profiles resist flattening better than soft, flat ones at the same height. When comparing products, look at the whole specification rather than the headline pile height, and where possible handle a sample and press it to feel how quickly it recovers.
Pile height, comfort and maintenance
Pile height also affects how the lawn feels underfoot and how much upkeep it asks of you. A medium pile gives a soft, cushioned feel that suits sitting and playing on, while a short pile feels firmer and more lawn-like in the formal sense, and a long pile feels plush and deep when new. That plushness is appealing in a showroom, but it comes with a maintenance cost: the longer the pile, the more it relies on regular brushing against the grain to keep the fibres upright, and the more obvious any flattening or tracking becomes where it is walked.
Shorter and medium piles are more forgiving on maintenance. They spring back on their own more readily, hide foot traffic better and need less brushing to stay looking even. They also tend to drain and dry faster, because water and debris are not held deep in a long pile, which matters in a wet British climate and in shaded gardens that dry slowly. For households that want a tidy lawn without a regular brushing routine, that points firmly towards a medium pile rather than the longest available.
Heat is a smaller but real consideration. A denser, longer pile in full summer sun can hold warmth at the surface, while a shorter pile dissipates it a little faster. None of this should override matching the height to use, but it is another reason the medium range is such a common recommendation: it balances a natural look, a comfortable feel, manageable maintenance and reasonable drainage. If in doubt, order samples in two or three heights, lay them in the spot they will go and walk on them — the difference in feel and recovery between a 25mm, a 35mm and a 45mm pile is obvious once you handle them, and far more informative than the numbers alone.
The overall guidance, then, is to choose pile height for how the area is used rather than for the biggest number. A medium pile around 30mm to 37mm is the sensible default for most family gardens, balancing a natural look, a comfortable feel and manageable upkeep. Go shorter for high-traffic areas, dogs, balconies and anything sport-like; reserve the longest piles for decorative lawns that are walked on lightly. And remember that pile height works together with density, face weight and fibre shape, so read the full specification rather than fixating on millimetres. Matched to its use and backed by good density, the right pile height gives a lawn that both looks real and keeps looking that way.
Frequently asked questions
Is longer pile artificial grass more realistic?
Not usually. Real lawns are kept short by mowing, so a very long pile of 45mm or more can look artificial and tends to flatten under use. A medium pile around 30 to 37mm with a varied colour and thatch layer generally looks more natural and performs better.
What pile height is best for dogs?
A shorter, firmer pile of around 20 to 30mm works best for dogs. It drains and dries quickly, resists flattening from running, and is easier to brush, hose down and keep hygienic than a long, soft pile that traps debris and lies flat.
Does pile height affect how hard-wearing artificial grass is?
Yes. Shorter piles are inherently more durable because the fibres are less prone to bending and flattening under foot traffic. Longer piles look lush but wear and flatten faster in busy areas, so high-traffic spaces are better served by a shorter, denser grass.
Sources & further reading
Figures on this page are typical UK ranges drawn from published cost guides and are intended as guidance, not a quotation.