Terrace courtyards and narrow side access: why an existing slab can be the good news
On a standard soil installation, excavation and base building are where most of the labour and cost sit, roughly 30 per cent of the job by published Australian industry figures, with materials and the turf itself making up the rest. If you already have a sound concrete courtyard or a paved area behind the house, that stage is largely done for you. The slab or pavers become the base, and the job becomes preparation and fixing rather than digging and rebuilding.
This matters more in Sydney than it might elsewhere, because so many inner suburban blocks have side access measured in centimetres rather than metres. Where a soil install means carting spoil out through a narrow gate by hand, and bringing road base and screenings back in the same way, a hard surface install skips that entirely. That is a genuine reason terrace courtyards in suburbs like Maroubra so often go straight over the existing paving rather than being dug out, and it is worth factoring into how you compare quotes. For the fuller picture of what a soil based job costs by comparison, our breakdown of Sydney turf pricing by tier sets the two approaches side by side, and the step by step version of the soil process is in our guide to how artificial grass gets laid here. A slab that needs remedial work first, on the other hand, such as an established brick and tile block in Ryde with a cracked or sunken section, can close that saving quickly.
Drainage and fall: the one thing that decides whether this works
Turf itself is indifferent to what is underneath it. What actually determines whether a hard surface install succeeds or fails is whether water can get away from under it, and that comes down entirely to the slab or the paving, not the product you choose. On a soil base, water passes through the turf backing and keeps moving down through the sub base. Concrete and pavers do not offer that route. Water that comes through has to travel sideways across a sealed surface to an outlet, so if there is no fall, or the fall runs the wrong way, it simply sits.
The test is simple and worth doing before you get a single quote. Hose the whole area down on a dry day as though it were rain, walk away for twenty minutes, then come back and look. Water heading towards a grate, a garden bed or the open edge of the slab means the fall is doing its job. Standing water anywhere means that spot will hold moisture under the turf every time it rains, with no sun or airflow reaching it to dry it out. A shaded courtyard between two terrace walls, which describes a lot of inner Sydney backyards, is exactly the setting where that problem shows up worst and takes longest to resolve on its own.
Where a slab has no fall at all, the fix is a drainage job before it is a turf job: a spoon drain or grate cut into the low point, a screed laid to correct the fall, or in harder cases breaking out and rebuilding the section properly. None of that is something to discover once the turf is already down.
How turf is actually fixed to a hard surface, and why pegs are off the table
On soil, the perimeter of a lawn is held down mechanically, pegs or nails driven into the prepared edge at regular intervals as the turf is stretched into place. Concrete removes that option entirely. There is nothing to drive a peg into, and drilling and plugging a slab every 30–40cm is slow, looks rough at the edges, and on a balcony risks going straight through a waterproof membrane that is doing a much more important job than holding down a lawn.
Hard surface jobs are bonded instead. Turf adhesive runs around the full perimeter and along every join, with the fibres kept clear of the glue line so the seam disappears once it is brushed. A foam underlay of roughly 5mm typically goes down first, which does two things: it takes the hardness out of bare concrete underfoot, and it smooths over small surface flaws so trowel marks or paver joints do not telegraph through once the turf is laid. Whether the whole slab gets glued or just the perimeter and joins usually comes down to exposure, a sheltered courtyard needs less adhesive than an open balcony where wind can get under an edge.
Because the preparation stage is already done for you, a hard surface install is genuinely one of the more DIY friendly turf jobs there is, provided the slab itself checks out. Where it stops being a weekend job is a slab that needs drainage work, a balcony with a membrane to protect, or joins in a spot where a wobbly glue line would be visible forever. Our comparison of what a hardware store roll gets you against a properly fixed trade job goes through where that line sits in more detail.
Heat on a paved courtyard: what changes and what actually helps
Artificial turf runs hotter than living grass everywhere, and that gets worse on concrete or pavers specifically, because the slab absorbs heat through the day and re-radiates it back up into the turf sitting on top of it. Western Sydney University researcher Dr Sebastian Pfautsch has reported unshaded artificial turf reaching surface temperatures well above natural grass, and a hard surface underneath only adds to that effect rather than offsetting it. The same product will run warmer over a slab than over prepared soil, and stay warmer later into the evening.
The practical response is the same one that applies anywhere in Sydney, just more important on a paved courtyard. Manufacturers including TigerTurf point to shade, hosing the surface down before use on a hot day, and choosing a lighter coloured yarn, which runs cooler than dark green as a matter of straightforward physics. Products marketed as cooling yarns or evaporative infills may genuinely help, but the specific percentage figures suppliers quote are their own claims rather than independently verified numbers, so ask for the data behind any figure like that. A north or west facing courtyard boxed in by brick walls on two sides is the hardest case, and worth planning shade into the job from the start rather than adding it later. We go through the temperature question in full, including what the research does and does not establish, in our separate look at how hot a synthetic lawn gets in Sydney sun.
Strata and balcony approval: a building management matter, not a council one
People often ask about council rules before laying turf, but for anything inside a strata building, balconies and shared courtyards specifically, council is almost never the relevant authority. A large share of inner Sydney apartments and townhouses sit within a strata scheme under NSW law, and balconies plus any common property courtyard are typically managed by the owners corporation, not by local government. Alterations, floor coverings and anything that could affect a waterproof membrane are the sort of thing the scheme's by laws cover, and those rules differ from building to building.
The practical upshot is to check with the owners corporation or the strata managing agent in writing before you order anything, not after, and to keep the reply on file. If the space is common property rather than your own lot, approval is not optional. Renters have a second layer on top of that: landlord approval, separate to and in addition to whatever the strata scheme requires. None of this is a reason to avoid a balcony install, plenty go ahead every year, but it is the step that should happen before the slab gets measured, not after the turf turns up.
Concrete, pavers and balcony questions Sydney homeowners ask us
Can artificial grass actually be laid straight over an existing concrete courtyard?
Yes, and in Sydney's terrace and semi suburbs it is one of the more common jobs going, because so many of those courtyards were paved or concreted long before anyone thought about putting grass back. The turf does not need soil underneath it to work. What it needs is a slab that is sound and that sheds water somewhere sensible. If the concrete or pavers you already have tick those two boxes, you are skipping the most expensive stage of a normal install, which is digging out and rebuilding a compacted base.
How do I find out whether my slab or paving drains well enough for turf?
Run a hose over the whole area on a dry day for a few minutes, the way rain would fall on it, then leave it and check back in twenty minutes. Water should be visibly heading somewhere, a grate, a garden bed, a step down, or the open edge of the slab. If you can see a puddle sitting anywhere, that is precisely where water will collect under the turf every time it rains, with no soil underneath to let it keep moving down and away.
What actually goes wrong if water gets trapped under turf on concrete?
On a well built soil base, water that comes through the turf backing keeps travelling down through the sub-base. A slab does not offer that escape route, so trapped water just sits there. In a shaded inner Sydney courtyard that rarely gets full sun, sustained damp under the backing is how you end up with a musty smell, slime and staining that will not brush out. None of that is a fault in the turf itself. It is a fault in the surface it was laid on, made invisible until it is not.
How is turf actually fixed down if you can't peg it into concrete?
You cannot drive a peg into a slab, and drilling and plugging every 300–400mm around the perimeter is slow and, on a balcony over a waterproof membrane, a genuinely bad idea. The standard method on hard surfaces is turf adhesive along the perimeter and every join instead of pegs, usually over a foam underlay of around 5mm. How much of the field gets glued beyond the edges depends on exposure: a sheltered courtyard needs less than a windy rooftop or balcony where lifting at an edge is the real risk.
Is a foam underlay under the turf actually necessary on a hard surface?
It is not compulsory, but most installers use one over concrete or pavers for two practical reasons. Turf laid straight onto bare concrete feels exactly as hard as concrete underfoot, which matters if kids or pets use the space, and a thin foam layer takes the edge off that. It also evens out small surface flaws, so trowel marks, paver joints or slightly uneven pavers do not read through the turf once it is down. A thicker shockpad is a different product again, used where genuine impact absorption is the point.
Does turf over a concrete courtyard run hotter than turf on soil?
Yes, and it is worth knowing before you commit rather than after the first heatwave. Western Sydney University researcher Dr Sebastian Pfautsch has reported very high surface temperatures on unshaded artificial turf generally, and a slab that has been absorbing sun all day and re-radiating that heat only adds to it. Manufacturers including TigerTurf acknowledge the surface gets warm and point to shade, hosing it down before use and lighter coloured yarn as practical ways to manage it. A north or west facing courtyard with brick on two sides is the toughest version of this.
Do I need my owners corporation's approval before putting turf on a balcony or shared courtyard?
Almost certainly, and it is worth checking before you buy anything rather than after. This sits with your owners corporation under the NSW strata scheme, not with council: balconies and shared courtyards in a strata building are typically common property or governed by the scheme's by laws covering alterations, floor coverings and anything that could affect a waterproof membrane. Ask in writing and keep the reply. Renters need their landlord's written approval as well, separate to any strata sign off.
My pavers are a bit uneven. Do they need to be relaid before turf goes down?
Test it before assuming either way. Walk the area and rock a few pavers underfoot. If they are firm and only the joints look untidy, turf and an underlay will generally sit fine over the top. If individual pavers rock, tip or have sunk relative to their neighbours, that movement carries on under the turf and you will feel every lip through the surface. Loose pavers should be relaid and badly settled sections screeded level first, otherwise the fix becomes permanent the moment the turf goes down.
Is turf on an existing slab cheaper than a full soil based install?
Usually, because base preparation, which is roughly 30 per cent of a typical job's cost according to published Australian industry figures, is largely a non-issue when the slab is already flat and sound. You are still paying for the turf, the underlay, the adhesive and the labour to lay it properly, so it is not free, but skipping excavation and a full crushed rock base is where the real saving sits. A slab that needs a channel drain cut in or a screed to correct its fall can close that gap quickly, which is why an accurate quote needs someone to actually look at it.
Related reading
- Artificial lawn on a Randwick terrace courtyard
- Pool surrounds: coping edges, splash-out and drainage
- Synthetic grass on a strata balcony slab
- Artificial lawn and synthetic turf options across Sydney
- Synthetic turf pricing in Sydney
- The full soil based laying process and what it costs
- DIY turf versus a trade installation
- Does synthetic turf get too hot?
- Sydney turf installers
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