Exposed aggregate or plain concrete: which suits Bulimba homes better?

Neither finish is universally better for Bulimba homes. Plain concrete suits tight budgets and low-maintenance priorities, while exposed aggregate is the stronger choice for slip resistance, kerb appeal and long-term durability in Brisbane's wet summers. The right answer depends on where the slab is going, how much foot traffic it gets and what your house already looks like.

What actually separates the two finishes

Plain concrete is poured, screeded and given a surface texture (typically a broom finish or steel-trowel finish) before it fully cures. You see the concrete matrix itself. It looks clean and minimal, and done well it is perfectly attractive.

Exposed aggregate concrete starts the same way, but before the surface sets fully the contractor applies a surface retarder and then washes or brushes back the top layer of cement paste to reveal the stones embedded in the mix. Those stones (called aggregate) give the surface its texture, colour and grip. In Brisbane, common aggregate choices include river pebbles, recycled glass, granite chips and quartz, though the specific blends vary by supplier and season.

Both products are standard concrete underneath. The difference is almost entirely in the finish, and in the price to achieve it.

How the Bulimba streetscape factors in

Bulimba and the surrounding Inner East suburbs (Hawthorne, Norman Park, Balmoral, Morningside, Cannon Hill) have a particular character. Older Queenslanders and post-war weatherboard homes sit alongside 1980s brick and newer infill townhouses. Many blocks are on slopes, especially in Norman Park and Balmoral, where retaining walls and stepped driveways are common. Flat allotments closer to the Oxford Street precinct tend to have simpler layouts.

That mix matters for finish choice. A Queenslander with timber battens, a corrugated iron roof and a raised front deck tends to look more cohesive with an exposed aggregate driveway than a stark grey plain slab. The natural stone tones complement timber and weathered metal rather than competing with them. On the other hand, a contemporary townhouse with rendered walls and clean lines can look sharp with a broomed or trowelled plain concrete path.

This is aesthetic opinion rather than rule, but local concreters tend to observe it consistently across the area.

Slip resistance and Brisbane's weather

Brisbane's summers are wet. The Inner East gets around 1,100 to 1,200 millimetres of rain annually, and a lot of it arrives in short, heavy falls. A smooth trowelled slab can become genuinely slippery when wet, especially on a slight slope.

A broom-finished plain concrete surface improves grip considerably, and for most flat footpaths and entertaining areas it is adequate. But where there is a grade (a sloped driveway in Norman Park or Balmoral, for example), exposed aggregate adds meaningful texture underfoot and under tyre. The aggregate stones create consistent micro-relief across the surface rather than just parallel broom lines, which tend to channel water rather than break it up.

For pool surrounds, which several Bulimba homes have given block sizes and backyard culture, exposed aggregate is widely considered the safer finish. The difference becomes especially noticeable with older residents or young children.

Cost: what the price gap actually looks like

Plain concrete is cheaper per square metre, as a rule of thumb. Expect rough ballpark figures of around $70 to $100 per square metre for a plain broomed concrete driveway in Brisbane's Inner East, versus $100 to $130 or more for exposed aggregate, depending on aggregate selection, job complexity and access. These are indicative figures for 2024 and can shift with material costs.

On a 40-square-metre driveway (a common size for Inner East lots), that gap is roughly $1,200 to $1,600 in favour of plain concrete. That is real money. But consider what you are comparing over a 20 to 25 year lifespan.

Plain concrete is more prone to surface staining and UV fading. It can look tired more quickly, particularly in the sun exposure Brisbane delivers year-round. Exposed aggregate hides minor oil stains and wear marks better because the broken texture distributes visual attention across the surface rather than concentrating it.

Resurfacing a worn plain concrete driveway to refresh its look is possible and typically cheaper than full replacement, but it adds to the long-term cost. Exposed aggregate generally holds its appearance longer without intervention, which partly offsets the higher upfront price.

Maintenance realities for both finishes

Plain concrete needs periodic pressure washing and, on driveways, prompt attention to oil leaks. A sealer applied every few years helps with staining and UV protection. It is straightforward maintenance most homeowners can handle themselves.

Exposed aggregate needs pressure washing too, typically once a year in Brisbane given the combination of humidity, leaf litter (especially under the large fig and jacaranda trees common across Hawthorne and Bulimba streets) and general grime. A quality sealer applied after installation and reapplied every two to three years keeps the surface looking sharp and protects against the surface mortar slowly eroding around the stones.

Neither finish is high-maintenance in absolute terms. Exposed aggregate does need a slightly more careful approach to cleaning (avoid very high-pressure settings directly on the aggregate) but it is not onerous. If you genuinely want as close to zero-maintenance as possible and aesthetics are a secondary concern, plain concrete is slightly simpler to live with.

Where each finish makes the most sense

To be direct about the trade-offs:

Choose plain concrete if:

• Budget is the primary driver and you are working under $5,000 for the whole job.
• The application is a shed or garage slab where appearance is not a concern.
• The surface is internal (like under a covered garage or carport) where slip resistance and UV are not factors.
• The property is a contemporary-style build where a clean, minimal surface is the deliberate design choice.

Choose exposed aggregate if:

• The surface is a driveway, entertaining area or pool surround where slip resistance matters.
• The home is a Queenslander or older character home where natural tones complement the existing materials.
• You want a finish that will hold its appearance across Brisbane's UV and humidity without looking washed out inside five years.
• The driveway is sloped (which is common in Norman Park, Balmoral and parts of Morningside).

For entertaining areas and alfresco slabs specifically, exposed aggregate is overwhelmingly the more popular choice in this part of Brisbane, and it shows on the resale front: buyers recognise it as a quality finish.

A straightforward recommendation

If you are pouring a driveway or outdoor entertaining area in Bulimba or the surrounding Inner East and the budget can stretch to it, exposed aggregate is worth the extra cost. It performs better in wet conditions, ages more gracefully in Brisbane's climate and suits the character of most housing stock in the area.

If budget is genuinely tight, a properly done broom-finished plain concrete slab is nothing to be embarrassed about. Ask for a coarser broom texture on any sloped surface, and seal it promptly after curing.

The most important variable in either case is not the finish. It is the preparation: a well-compacted sub-base, correct reinforcement for your soil type, proper expansion joints and good drainage fall. A premium aggregate finish poured on poor preparation will fail. A plain concrete slab prepared and poured correctly will outlast a badly laid exposed aggregate job every time.

If you want to talk through your specific block in Bulimba or a nearby suburb and get a clearer sense of what would suit it, that is exactly the kind of conversation worth having with a local concreter who knows the area.