What decides it is the condition of the concrete below the surface. If your slab is intact and the damage is only cosmetic, resurfacing can make your driveway look almost new for much less money. If the slab is moving, or the ground under it has failed, an overlay is just an expensive cover-up for a problem that will come straight back.
In this guide we show you how to read the warning signs, what each option involves, and how Darwin conditions affect the decision: clay-rich, poorly drained pockets in some suburbs, soft ground near creeks and mangroves, wet-season downpours, intense sun and tight blocks where trucks struggle to get in.
What resurfacing involves
Resurfacing bonds a new layer onto your existing slab. The old concrete stays in place and becomes the base for the fresh surface. Most of the work is in the prep: we diamond grind the old surface so the new layer can key in, then inspect and treat every crack. Next we lay the topping, finish it in the style you've picked, whether plain, patterned, coloured or textured, and seal it. Like any new concrete it needs proper curing, which in Darwin means avoiding the hottest part of the day and covering it if a storm comes through. You'll find more on finish options on our concrete resurfacing page.
What replacement involves
Replacing a driveway starts with breaking out the old slab, loading and carting the rubble and paying to dump it. Then we excavate, lay and compact a fresh crushed-rock base and pour a brand-new slab. It's a much bigger job, and if your driveway runs between older houses or under an elevated home, getting an excavator in and rubble out adds to the cost. The benefit is that we can fix whatever caused the failure in the first place, whether that's storm water collecting under the slab, too thin a base over soft or clayey soil, or steel sitting too low in the concrete. If your base has failed, fixing that is the real reason to start fresh. Our concrete removal service explains how we handle the demolition stage.
When resurfacing is the right call
Resurfacing works when your slab is solid and the issue is mainly how it looks.
- A worn, faded or uneven surface on concrete that is otherwise intact.
- Stains and discolouring from oil, leaf litter, mould or years of UV.
- Fine crazing, that network of shallow surface cracks that isn't spreading.
- A dated style that no longer suits your home.
In these cases your slab is still doing its structural job and only the top layer is tired. A new surface fixes exactly that, and you keep your existing base, reinforcement and levels.
When your slab needs replacing
Once your slab stops acting as one solid piece, replacement is the honest recommendation.
- Cracks that keep widening rather than staying stable, often where clay soil swells in the wet and shrinks in the dry.
- Sections sitting higher or lower than the ones beside them, showing the slab has broken into separate pieces.
- Spalling with rust stains, which means the reinforcement inside is corroding and expanding.
- Widespread scaling, where a poorly cured surface, often one that dried too fast in the heat, has started breaking apart.
All of these point to a problem with the base, the steel or both. An overlay on a failing slab may last a few months before the old cracks show through, and then you've paid for resurfacing and still need a new driveway.
Resurfacing and replacement compared
Here's how the two options weigh up side by side.
| Resurfacing | Replacement | |
|---|---|---|
| Cost | Much lower than replacing | Includes break-out, carting, tip fees, a new base and a full pour |
| Disruption | Typically a few days, no demolition | Longer, with machinery on site and rubble trucked away |
| Lifespan | Many years, depending on the slab below | The life of a new slab, often 30 to 40 years |
| Best suited to | A sound slab with a worn or dated finish | A slab with through-cracks, sinking sections or a failed base |
How we check your driveway
We don't just look at the surface; we look for the cause. We check which cracks are still active, whether sections have moved relative to each other, where storm water runs, especially if it crosses the driveway or sits along an edge, and whether there's any rust staining from the steel. Only then can we tell you which option your driveway actually needs.
Not sure yet? Send us a few photos
A wide photo of your driveway, a few close-ups of the cracks that concern you and any spots where the levels drop are usually enough for us to give you a first opinion. If it looks like a good resurfacing candidate, we'll come out, inspect it in person and give you a written quote. If it really needs replacing, we'll tell you straight.