Is synthetic grass sustainable for schools?

Synthetic grass can be a practical, durable and good-value surface for schools, but its sustainability depends on where it is used, the type of system installed and what it is being compared with.

The comparison with natural turf is more complex than plastic versus grass. Natural turf is a living surface, but maintaining it under heavy school use requires water, mowing, energy, labour and ongoing renovation. Synthetic grass removes many of those recurring inputs and provides much greater consistency under concentrated use, but requires more manufactured material upfront and eventually needs replacement.

The better question is not simply which surface is more sustainable?

It is which surface delivers the best whole-of-life outcome for this particular part of the school?

A synthetic grass lawn under mature trees at a school, with students playing at lunchtime

What is the real cost of maintaining natural turf?

Natural turf is renewable, but a heavily used school lawn requires ongoing inputs to remain healthy and usable.

Depending on the site and intensity of use, these can include:

mowing and edging
petrol or electricity for machinery
irrigation and water
fertiliser and soil amendments
aeration and decompaction
topdressing
weed management
repairing worn areas
replacement turf or oversowing
labour and contractor visits
machinery maintenance
downtime while repaired turf establishes

This is the part of the environmental equation that is sometimes overlooked.

Natural grass may have a relatively low initial installation cost, but a school maintains it continually throughout its life. Where hundreds of students repeatedly use the same relatively small area, those inputs can become substantial.

How long does natural turf last?

Natural turf does not have a fixed replacement date in the same way as a manufactured surface.

With suitable sunlight, soil, drainage, irrigation and maintenance, a well-designed natural turf area can remain in service for decades. Worn areas can be repaired individually rather than requiring the entire lawn to be replaced.

The difficulty is concentrated school use.

High-traffic areas around entries, goals, desire lines and popular gathering points can repeatedly lose grass and compact. In these conditions, sections may need regular renovation or re-turfing.

The real lifecycle question is therefore not how often an entire natural lawn is replaced. It is how much work, water and renovation are required each year to keep it performing at the level the school expects.

What does natural turf give back?

Natural turf also provides benefits that synthetic grass cannot fully replicate.

Healthy turf can:

cool the surrounding environment
maintain living soil
support soil organisms
allow natural water infiltration where soil conditions are suitable
provide some habitat and foraging opportunities for birds
contribute to a softer, living landscape
regenerate rather than requiring complete manufactured-surface replacement

A lawn is not equivalent to a biodiverse native landscape, but it remains a functioning biological system rather than an inert surface.

What is the real cost of synthetic grass?

Synthetic grass generally reverses the cost profile.

It usually requires a higher initial investment, but eliminates mowing and irrigation for turf growth and significantly reduces the continual repair associated with worn natural grass.

It is not maintenance free.

A school should still expect:

cleaning and removal of organic material
brushing or grooming
inspection of seams and edges
local repairs
drainage inspection
occasional specialist maintenance

The major difference is that these inputs are generally less frequent than maintaining heavily used living turf.

Synthetic grass also has an eventual capital replacement cost that needs to be considered from the beginning.

How long does synthetic grass last?

The answer depends on the product, UV exposure, installation quality, intensity of use and maintenance.

For heavily used synthetic sporting surfaces, Australian asset planning commonly works around a service life in the vicinity of 8 to 10 years, although landscape systems and individual products can vary considerably.

Manufacturer warranties also vary and should not be confused with expected service life.

A school should ask three separate questions:

What is the warranty?
What service life should we realistically expect under our level of use?
What exactly does the warranty cover if the surface fails?

When synthetic grass eventually reaches the end of its serviceable life, the carpet needs to be removed and replaced. Depending on its condition, some underlying infrastructure may be retained.

This creates a larger periodic capital event than the progressive repair normally associated with natural turf.

What about loose rubber crumb?

This is an important distinction when discussing the environmental impact of synthetic turf.

Some synthetic sports fields contain loose rubber crumb infill between the grass fibres. This material can migrate from the field into surrounding areas, drains and waterways.

ULP does not install loose rubber crumb infill in our synthetic grass installations, and we advise against its use.

Australian research and monitoring have identified rubber crumb from synthetic sporting surfaces as a potential source of microplastic pollution.

A school landscape installation without loose rubber crumb is therefore materially different from a large synthetic sports field containing mobile rubber infill.

That distinction does not eliminate every environmental consideration associated with synthetic grass, but it is important when comparing different systems.

What about microplastics?

Even without rubber crumb, conventional synthetic grass is still a polymer-based product.

The fibres can wear over time and potentially contribute small plastic fragments to the surrounding environment.

Product quality, edge detailing, drainage, maintenance and installation method can influence this, but they do not make conventional synthetic turf plastic free.

This is one reason ULP believes synthetic grass should be used deliberately rather than automatically.

What about heat?

Heat is one of the most important considerations when using synthetic grass in a school.

Synthetic turf can become considerably hotter than healthy natural grass when exposed to direct sunlight. Australian research has recorded very high synthetic-turf surface temperatures during hot conditions.

However, synthetic grass should not be assessed independently of its surroundings.

Shade is the primary heat-management strategy.

Trees, shade structures, orientation and the surrounding landscape can dramatically change surface temperatures. Sydney playground research found that shading a synthetic turf surface reduced its maximum temperature by more than 40°C under the conditions tested.

Pile height also needs to be selected for the application. It should not be assumed that longer pile is cooler. Australian testing has actually recorded higher average temperatures on longer-pile synthetic turf than shorter-pile products under comparable conditions.

ULP therefore considers synthetic grass as part of the complete shade and landscape strategy, rather than selecting it as an isolated surface.

Are more sustainable synthetic products becoming available?

Yes.

Synthetic turf technology is evolving, and manufacturers are beginning to reduce reliance on conventional fossil-derived plastics.

Some products now use bio-based polyethylene manufactured partly from renewable feedstocks such as sugarcane. There are also systems incorporating recycled materials and alternative infills rather than conventional rubber crumb.

These developments are promising, but the terminology needs to be understood carefully.

Sugarcane-derived polyethylene is still polyethylene. The renewable feedstock can reduce reliance on fossil carbon, but it does not make the finished turf biodegradable or eliminate questions around heat, fibre wear, durability and end-of-life recovery.

ULP will continue to assess these emerging products as the technology develops.

Natural turf vs synthetic grass

Consideration	Natural turf	Synthetic grass
Initial investment	Usually lower	Usually higher
Ongoing inputs	Water, mowing, turf care, machinery and labour	Cleaning, brushing, inspection and periodic maintenance
Water	Irrigation may be required	No irrigation for plant growth
Heavy concentrated use	Can wear and require recovery	Performs strongly
Availability	May require recovery periods	Generally more consistent
Repair	Worn areas can usually be repaired locally	Local repairs possible, with eventual carpet replacement
Asset life	Can regenerate and be progressively renewed	Manufactured surface with a defined replacement cycle
Heat	Provides natural cooling when healthy	Can become hot in direct sun, making shade critical
Drainage	Can infiltrate naturally where soil conditions allow	Can drain very effectively through a properly designed base
Mud and wear	Possible under heavy use or poor drainage	Avoids mud and grass loss
Soil ecology	Maintains a living soil system	Separates the active surface from the soil
Appearance	Changes with season, wear and maintenance	Consistent throughout the year
Environmental inputs	Water, energy, fertiliser and ongoing maintenance	Manufactured materials, embodied energy and eventual replacement
Microplastics	No synthetic grass fibres	Potential fibre wear
Best suited to	Areas where living turf can perform successfully	High-use or difficult areas where natural turf repeatedly struggles

Which provides better value for money?

This depends heavily on the site.

Natural turf generally has a lower initial cost but higher recurring maintenance requirements.

Synthetic grass generally has a higher initial cost but lower routine grounds maintenance and greater availability under intensive use.

Current Sydney installation pricing indicates that quality synthetic turf can cost several times more per square metre initially than straightforward natural turf installation. But installation price alone is a poor measure of value.

A school should consider:

initial cost + maintenance + water + labour + repairs + downtime + eventual replacement

over the period it expects to use the surface.

For synthetic grass, the higher initial investment can produce a return where it substantially reduces repeated turf repairs, irrigation, mowing and periods when an area cannot be used.

For natural turf, the lower initial investment can remain excellent value where the grass grows successfully and maintenance requirements remain manageable.

The most useful ROI measure is therefore not simply cost per square metre.

It is closer to:

whole-of-life cost ÷ useful service delivered

A cheap natural lawn that repeatedly becomes bare, muddy or unavailable may represent poor value.

An expensive synthetic surface installed where healthy natural grass would have performed perfectly may also represent poor value.

So, which should a school choose?

For many schools, the strongest answer is both.

Natural turf makes sense where sunlight, drainage, available area and maintenance resources allow a living surface to perform successfully.

Synthetic grass can make excellent sense in areas of concentrated use, difficult growing conditions or locations where consistent year-round availability is particularly valuable.

The objective should not be to cover the campus in either material.

It should be to use each surface where its strengths justify its environmental and financial cost.

ULP’s approach

ULP does not regard synthetic grass as inherently good or bad.

We use it selectively and consider the whole landscape around it.

We do not install loose rubber crumb infill and advise against its use.

Where synthetic grass is appropriate, we consider product quality, expected lifespan, shade, drainage, heat, maintenance, intensity of use and emerging lower-impact materials.

Where natural turf can perform successfully, we recognise the significant benefits of living soil, natural cooling, permeability and connection with nature.

Before replacing struggling natural turf with synthetic grass, it is also worth understanding why the grass is failing. Poor drainage, compacted soil, insufficient sunlight, inappropriate turf selection or highly concentrated traffic may point to a different solution.

The better question is not:

Natural turf or synthetic grass?

It is:

Where will each surface deliver the best long-term outcome for the school?

Next step

ULP can assess surfacing as part of the whole school landscape, including shade, use, maintenance and play value. Talk to us about the right material mix for your site.