Central Coast Concrete Revival treats a tired exposed aggregate driveway one of two ways depending on condition: a sound but dull, porous surface is ground back and resealed from around $800, while a badly worn, pitted or stone-shedding driveway is better resurfaced with a new spray-on or overlay finish, indicatively $2,500 to $8,000+. Which path suits yours comes down to the state of the aggregate, not its age.
Exposed aggregate was a popular driveway finish across the Coast from the 1970s onward, and plenty of those original slabs are still doing service outside brick homes in Woy Woy, Umina, Bateau Bay and Killarney Vale. Decades of salt air, sun and traffic treat exposed aggregate differently to a plain trowelled slab, though, so the right fix isn’t always what a homeowner assumes. This guide works through when to reseal, when to resurface, and what each path indicatively costs.
What is an exposed aggregate driveway, and why does it age differently?
Exposed aggregate concrete is poured with decorative stone mixed through it, then the surface cement skin is washed or ground back while it’s still workable (or later, mechanically) so the stones themselves show through as the finished surface. The result is a pebbled, naturally slip-resistant texture that a lot of Coast homeowners still like: it doesn’t rely on paint or colour to look good, because the aggregate itself is the finish.
The catch is that the wearing layer is the stone-to-cement bond, not a topcoat. Once the sealer protecting that bond wears through, the surface starts to chalk, go porous and eventually shed loose stones underfoot. Plain broom-finished concrete just fades; exposed aggregate can physically lose material. Combined with Coast conditions, salt-laden air and humidity degrade budget sealers faster here than inland, which is exactly the factor our concrete resurfacing cost guide flags as the biggest coastal variable across every finish type.
Should I reseal my exposed aggregate driveway, or does it need full resurfacing?
Central Coast Concrete Revival recommends resealing when an exposed aggregate driveway is structurally sound and the stones are still firmly bedded, and recommends full resurfacing when the surface is badly pitted, has lost significant aggregate, or is cracked and uneven beneath the stone. An honest inspection is what actually decides it, not a fixed rule, but the pattern holds in most Coast cases.
Resealing (with an optional grind and recolour first) is usually the right call when:
- The driveway is sound but dull, porous or chalky: classic signs the sealer, not the concrete, has failed.
- Stones are still firmly bedded, just losing their sheen and colour depth.
- You like the exposed aggregate look and simply want it protected and refreshed rather than replaced with a different finish.
- The problem is mostly cosmetic staining or unevenness, addressed with our concrete grinding and sealing service.
Full resurfacing with a new spray-on or overlay system, covered on our driveway resurfacing page, makes more sense when:
- Stones are visibly popping out or the surface feels gritty and loose underfoot in patches.
- The aggregate sits over a cracked, uneven or badly worn base that grinding alone won’t fix.
- You want a different look altogether: a plain colour, two-tone or stencilled pattern rather than exposed stone.
- Previous sealer coats have failed repeatedly, suggesting the surface is past the point where resealing buys much time.
If you’re not sure which category your driveway falls into, that’s normal: it’s exactly what a site inspection is for, and a proper one will recommend the cheaper option whenever it genuinely applies.
How much does it cost to grind and reseal an exposed aggregate driveway?
Central Coast Concrete Revival grinding and resealing of an existing exposed aggregate driveway typically costs $800 to $2,000 for a straightforward reseal with minimal prep, rising to $2,000 to $5,000 where a fuller grind and recolour is needed across a single or double driveway. Square metres, how much old sealer has to come off, and the sealer system chosen all move the price within those bands.
A penetrating sealer (silane/siloxane type) is the usual specification for exposed aggregate, because it soaks into the stone and cement rather than sitting on top, so it protects against salt and water without dulling the natural stone look or reducing grip. That detail, and how penetrating sealers compare with film-forming ones, is covered in more depth on the concrete grinding and sealing page.
How much does it cost to resurface an exposed aggregate driveway with a new finish?
Central Coast Concrete Revival resurfacing of a worn exposed aggregate driveway with a new spray-on or overlay system typically costs $2,500 to $8,000+, following the same bands as any other driveway resurfacing job: roughly $2,500 to $4,000 for a single driveway in sound condition once ground and coated, $3,500 to $6,000 for a double driveway with standard prep, and $6,000 to $8,000+ for a large, steep or heavily damaged slab. A stencilled or two-tone upgrade on top of any of these typically adds around 10 to 25%.
Because the existing exposed aggregate texture is coarse, prep for a full resurface usually means grinding the surface flatter before the new coating goes down, which is one reason resurfacing an old aggregate driveway can sit toward the middle or top of these ranges rather than the bottom.
Reseal versus resurface: indicative cost comparison
| Path | Indicative cost (guide only) | Keeps the exposed stone look? | Best suited to |
|---|---|---|---|
| Reseal only (clear, minimal prep) | $800-$2,000 | Yes | Sound aggregate, just dull or chalky |
| Grind, recolour and reseal | $2,000-$5,000 (driveway) | Largely, with refreshed tone | Sound aggregate with uneven colour or light staining |
| Full resurface (new spray-on or overlay) | $2,500-$8,000+ | No, new finish replaces the look | Stone loss, pitting, or a desired style change |
All figures are indicative Australian guide ranges only, dependent on a site inspection and formal written quote. See the concrete resurfacing cost guide for how these compare with other finishes and job types.
What makes exposed aggregate driveways start looking tired or lose their stones?
A handful of causes show up again and again on Coast driveways:
- Sealer failure. Every exposed aggregate driveway relies on its sealer to hold stones in place and repel water and salt. Once that sealer is exhausted, stones loosen and the surface goes porous.
- Salt air and humidity. Coastal exposure shortens sealer life noticeably compared with inland conditions, which is why film-forming sealers here often need renewing every two to four years rather than lasting longer.
- Shaded, damp aspects. South-facing driveways under trees can develop moss and dark staining faster, because they dry out more slowly between rain events.
- Age of the original mix. Some older aggregate pours used a weaker cement-to-stone ratio than current practice, so the bond was never as strong to begin with: an inspection can usually tell the difference between a sealer problem and a mix problem.
- Traffic and dragged loads. Trailer jockey wheels, dragged skip bins and dry-steering wear any driveway surface, exposed aggregate included.
Can a new finish be matched to my existing exposed aggregate, or will it look different?
Resealing (with or without a grind and recolour) keeps the natural stone-exposed look, just refreshed and better protected: this is the option if you want your driveway to still read as exposed aggregate. A full resurface with spray-on concrete or an overlay covers the aggregate with a new decorative layer, so the finished look is different: a solid colour, two-tone effect or stencilled pattern rather than visible stone. Neither option is right or wrong; it comes down to whether you actually like the exposed aggregate look or have been meaning to change it for years. Our concrete finishes guide compares spray-on, epoxy, overlay and grind-and-seal side by side, and if a patterned look appeals, our stencil concrete driveways guide covers that option specifically.
Indicative worked example: reseal versus resurface
The following is an indicative composite scenario built from typical Coast jobs, not a real past project or quote.
A 1980s double exposed aggregate driveway in Umina, roughly 60 m², has gone pale and slightly porous, with a few stones lifting near the garage entry where cars turn tightly. The rest of the surface is still firmly bedded.
- If resealed, with a light grind to clean the surface and a penetrating coastal-grade sealer, the job would sit in the $2,000-$5,000 grind-and-reseal band, keeping the original exposed aggregate look.
- If resurfaced instead with a new spray-on finish over the top, because the owner wanted a colour change rather than another reseal cycle, the job would sit in the $3,500-$6,000 double-driveway resurfacing band.
Both are legitimate choices for the same driveway; the deciding factor here is really “do we still want the stone look” rather than condition alone, since the slab in this example is sound either way.
Exposed Aggregate Driveway Resurfacing FAQs
How often should an exposed aggregate driveway be resealed on the Central Coast?
As a general guide, penetrating sealers on exposed aggregate tend to go longer between coats than film-forming acrylics, but coastal salt exposure still shortens the interval compared with inland homes. Watch for the practical signs instead of a fixed number: water no longer beading, a chalky look when dry, or stones starting to feel loose.
Can exposed aggregate be resurfaced with spray-on concrete instead of resealed?
Yes. A spray-on system can be applied over an existing exposed aggregate driveway once it’s properly ground and prepared, replacing the stone-exposed look with a decorative colour or pattern finish. This is the resurfacing path rather than the reseal path, and it typically falls in the same $2,500-$8,000+ range as resurfacing any other driveway.
Why is my exposed aggregate driveway losing its stones?
Almost always because the sealer protecting the stone-to-cement bond has worn through, letting water and salt work at the surface until stones loosen. It can also indicate the original pour had a weaker aggregate bond than modern mixes: an inspection can generally tell which is happening on your driveway.
Is resealing cheaper than resurfacing an exposed aggregate driveway?
Usually, yes: resealing an existing exposed aggregate surface typically costs a few hundred to a couple of thousand dollars, well under the $2,500-$8,000+ indicative range for a full resurface. Resealing only makes sense while the aggregate itself is still sound, though; once stones are widely loose or the base is uneven, resurfacing becomes the better-value option over time.
Does salt air affect exposed aggregate driveways more than other finishes?
Salt air and humidity affect every outdoor concrete finish on the Coast, but exposed aggregate is particularly sealer-dependent because the stones themselves can loosen once protection fails, not just the colour. That’s why a coastal-grade, typically penetrating sealer is the standard recommendation for aggregate driveways within a few streets of the beach.
Do I need council approval to reseal or resurface my exposed aggregate driveway?
Working on the existing slab within your own property generally doesn’t require approval, but anything touching the council crossover, footpath or stormwater drainage can, and rules vary by property. Check with Central Coast Council if your project touches any of those, and note that NSW contractor licensing thresholds also apply by job value and type; current details are available from NSW Fair Trading.
Get a straight answer for your driveway
Send a few photos of your exposed aggregate driveway, including any patches where stones are lifting, and we’ll organise a fast, no-obligation quote from a licensed local contracting partner who can tell you honestly whether resealing or resurfacing is the better spend.
Get a free quote or read our driveway resurfacing and grinding and sealing pages for more on each path.