Resurfacing vs Replacing Concrete: How to Decide

The short answer: if your concrete’s problems are on the surface — cracking you could cover with a coin, staining, fading, flaking, worn texture — resurfacing will almost always fix it for a third to a half of the cost of replacement. If the problems run through the slab — sections sinking or lifting, wide cracks that keep growing, a base that’s washed out or been invaded by tree roots — no coating can save it, and replacement (full or partial) is the honest recommendation. Most Central Coast driveways we look at fall firmly in the first category.

Here’s how to work out which side of the line your slab sits on before anyone quotes you a dollar.

Why this decision matters on the Coast

The Central Coast is full of 1970s–90s brick homes with their original concrete driveways — Woy Woy, Umina, Bateau Bay, Narara, Killarney Vale, take your pick. Forty-odd years of sun, salt air, tree litter and family cars leaves most of them looking rough: grey, cracked, oil-stained, maybe a faded stencil pattern from a 90s makeover. Rough-looking is not the same as structurally failed. A slab that was poured properly on a decent base is usually still doing its job underneath the ugly — and that’s exactly the slab resurfacing was invented for.

Get the diagnosis wrong in either direction and it costs you: resurface a failing slab and the new finish cracks within a year or two; replace a sound slab and you’ve spent $8,000–$15,000+ where $3,000–$6,000 would have done.

Quick comparison: resurfacing vs replacement

All costs indicative guide ranges only, dependent on site inspection and formal quote.

When resurfacing is the right call

Resurfacing makes sense when the slab is structurally sound but cosmetically shot. Typical signs:

• Hairline to narrow cracks (roughly coin-width or less) that haven’t moved in years
• Surface flaking or spalling where the top layer is worn but the slab beneath is solid
• Oil, rust and tannin stains that pressure cleaning won’t shift
• Faded or patchy colour, including old stencilled or painted finishes past their best
• Worn, slippery surface — common on steep Gosford and Terrigal driveways polished smooth by decades of tyres
• Dated looks — the slab works fine, it just drags the whole front of the house down

In these cases a proper resurfacing job — grinding, repairs, a new decorative layer and a coastal-grade sealer — delivers what looks like a brand-new driveway. Our driveway resurfacing page covers the process in detail, and if the surface is basically sound but tired, a simpler grind, recolour and reseal may be all it needs.

When replacement is genuinely needed

We’d rather tell you this upfront than coat over a problem. Replacement (of the whole slab or the failed section) is the right answer when:

• Sections have sunk or lifted and the slab is no longer on one plane — usually a base or drainage failure underneath
• Wide, active cracks — cracks you can fit a finger in, or ones with vertical displacement (one side higher than the other), or cracks that keep growing season to season
• Tree roots have lifted the slab — a coating won’t stop a fig or camphor laurel doing what it does
• Widespread “concrete cancer” — rusting steel reinforcement swelling and cracking the concrete from inside; isolated spots can sometimes be repaired, but widespread rust staining and delamination through the slab is terminal
• The slab is crumbling right through, not just flaking on top — common with poor original mixes
• Drainage is fundamentally wrong — if water pools against the house or garage, resurfacing preserves the problem; regrading needs a new pour

A note on the middle ground: plenty of Coast driveways need one failed panel replaced and the rest resurfaced. A good contractor will happily quote that hybrid — it’s often the best value of all.

The 8-point driveway self-check

Walk your slab with this list before you request quotes. It takes ten minutes.

1. Sight down the slab from the street. Is it flat and even, or can you see dips and heaved sections?
2. Measure the worst crack. Under about 5 mm wide with no height difference across it: resurfacing territory. Wide, stepped or growing: get structural advice.
3. Check crack edges. Clean, stable edges are fine; crumbling, spreading edges suggest deeper trouble.
4. Look for rust stains bleeding through the surface — possible reinforcement corrosion; have it inspected.
5. Tap suspect areas with a broom handle. A hollow, drummy sound means the surface layer has delaminated — small drummy patches are repairable, widespread drumminess is a red flag.
6. Check where water goes after rain. Pooling against structures is a design problem, not a surface problem.
7. Look at nearby trees. Large roots heading under the slab tend to finish what they’ve started.
8. Photograph everything. Photos of the worst areas get you an accurate initial opinion without waiting for a site visit.

Scored mostly fine? You’re very likely a resurfacing candidate. A couple of red flags? Get an inspection before anyone quotes either way — and be wary of a contractor who recommends full replacement without explaining specifically what’s failed.

The money side

The economics are covered properly in our concrete resurfacing cost guide, but the headline is simple: resurfacing a typical Coast driveway runs an indicative $2,500–$8,000+, while demolishing and re-pouring the same driveway commonly costs two to three times that. On a sound slab, resurfacing isn’t the compromise option — it’s the same visual result for less money, less mess and fewer days of your driveway being a construction site.

One more factor for the spreadsheet: street appeal. Agents consistently rate the driveway as one of the first things buyers judge from the kerb. Whether you resurface or replace, fixing it before sale is one of the cheaper front-of-house wins available — resurfacing just gets you there at a fraction of the spend.

Who does the work (and licensing)

In NSW, residential building work above certain contract values must be done by an appropriately licensed contractor — thresholds and categories change over time, so check the current requirements with NSW Fair Trading. Whichever way your decision goes, ask to sight the contractor’s licence and public liability insurance. Every job arranged through Central Coast Concrete Revival is quoted and completed by appropriately licensed local contracting partners.

Frequently asked questions

Is concrete resurfacing worth it?

On a structurally sound slab, yes — it delivers a new-looking surface for roughly a third to a half of replacement cost, with days rather than weeks of disruption. It’s not worth it on a slab with base failure, active structural cracking or widespread concrete cancer, because the new surface will follow the old slab’s movement.

Can you resurface a cracked driveway?

Usually. Stable, narrow cracks are ground out, filled and bridged as part of proper prep, and flexible repair systems handle normal hairline movement. Wide, active or stepped cracks are a different story — they indicate slab movement that resurfacing can’t fix, and honest advice may be partial or full replacement.

What is concrete cancer and can it be fixed?

Concrete cancer is corrosion of the steel reinforcement inside the slab — rusting steel expands and cracks the concrete from within, showing up as rust stains, bulging and spalling. Small, isolated spots can often be repaired before resurfacing. Widespread concrete cancer through a slab generally means replacement. If you’re seeing rust stains, get it inspected before making any decision.

How long does resurfacing take compared to replacement?

Resurfacing a typical driveway takes around one to three days on site, and you can usually walk on it within a day or so and drive on it within about a week, depending on the system — your installer will confirm. Replacement typically runs one to two weeks including demolition and pour, plus curing time before the new slab can take a car.

Do I need council approval to resurface my driveway?

For like-for-like restoration of a driveway on your own property, approval is rarely an issue — but rules vary and can change, so check with Central Coast Council if you’re unsure. Work on the crossover (the strip between the kerb and your boundary) is more likely to involve council requirements, particularly for replacement.

Can you replace part of a driveway and resurface the rest?

Yes, and it’s often the smartest option. A failed panel is cut out and re-poured, then the whole driveway is resurfaced in one finish so the repair disappears. You get structural integrity where it’s needed without paying to replace concrete that was still sound.

Not sure which side of the line your slab is on?

Send us photos of the worst bits — cracks, sunken corners, stains, the lot. We’ll give you a straight answer about whether resurfacing makes sense, and if it does, organise a fast quote from a licensed local specialist.

Call (02) 0000 0000 or use our Get a fast quote form — honest advice first, quote second.