POOL COMPARISON

Fibreglass vs Concrete Pool: Pros and Cons

If you are building a new pool or deciding how to resurface an existing one, the fibreglass vs concrete question comes up early. Both have genuine strengths and weaknesses. As a fibreglass pool resurfacing business on the Gold Coast, we obviously work with fibreglass every day — but we are not going to pretend concrete pools do not have their place. Here is an honest look at both options to help you make the right call for your situation.

A Quick Overview

Concrete pools (sometimes called gunite or shotcrete pools) are built on site by spraying concrete into a steel-reinforced framework. The interior is then finished with pebblecrete, quartzon, render or tiles. Fibreglass pools are manufactured as a single shell in a factory mould and craned into position on site — or, in the case of resurfacing, the fibreglass and gelcoat system is applied over an existing pool shell.

Each approach has trade-offs. The right choice depends on your budget, how much maintenance you are willing to do and what matters most to you in the long run.

Maintenance

This is where fibreglass has a clear advantage. The smooth, non-porous gelcoat surface resists algae growth and does not absorb pool chemicals the way concrete does. In practical terms, that means:

• Less chemical usage: Concrete is porous and absorbs chlorine, so you need to add more to maintain the same sanitiser level. Fibreglass pool owners typically use 50 to 70 percent less chemicals over the life of the pool.
• Less scrubbing: Algae clings to rough, porous concrete surfaces. On a smooth fibreglass gelcoat, algae struggles to take hold. You will spend far less time brushing the walls and floor.
• Easier to keep clean: Dirt and debris sit on top of a fibreglass surface rather than embedding into it. A quick vacuum or robotic cleaner handles most of the work.

Concrete pools need more hands-on upkeep. You will need to brush the surface regularly to prevent algae embedding into the pores, and you will go through more chlorine and acid to keep the water balanced. Over time, these costs add up significantly.

For a deeper look at fibreglass upkeep, see our complete guide to fibreglass pool maintenance.

Upfront Cost vs Long-Term Cost

Concrete pools generally cost more to build than fibreglass pools. A new concrete pool on the Gold Coast typically starts around $40,000 to $50,000 and can go well above $100,000 depending on size, shape and finishes. A fibreglass pool shell and installation usually sits between $25,000 and $60,000.

But the upfront price is only part of the story. Over a 20-year period, the total cost of ownership for a concrete pool is almost always higher. You are spending more on chemicals each week, more on electricity to run the pump longer (to compensate for the porous surface) and more on resurfacing when the interior wears out. Industry estimates put the lifetime running cost of a concrete pool at $5,000 to $10,000 more than an equivalent fibreglass pool over 10 years.

That said, if you already have a concrete pool, you do not need to demolish it and start again. A concrete to fibreglass conversion gives you the benefits of a fibreglass interior without replacing the entire pool structure. For a breakdown of what resurfacing costs on the Gold Coast, see our resurfacing cost guide.

Durability and Lifespan

Both pool types are durable, but they age differently.

A concrete pool shell can last 50 years or more — the structure itself is extremely strong. However, the interior surface does not last anywhere near that long. Pebblecrete and rendered finishes typically need resurfacing every 10 to 15 years. Cracks, staining, rough patches and hollow spots are all common as concrete interiors age. In the Queensland climate, with high UV exposure and warm water temperatures, deterioration tends to happen faster.

Fibreglass pool shells are flexible enough to handle minor ground movement without cracking — a real advantage on the Gold Coast where soil conditions vary. The gelcoat surface can last 15 to 20 years with proper water chemistry and basic care. When it does eventually need attention, resurfacing a fibreglass pool is generally quicker and less invasive than resurfacing concrete.

Fibreglass is not indestructible, though. Poor water chemistry, heavy impacts or osmosis blistering can shorten the lifespan of the gelcoat. The key is staying on top of your water balance — which is true for any pool type.

Resurfacing Options

Every pool surface wears out eventually, so it is worth understanding what resurfacing looks like for each type.

Concrete pool resurfacing usually involves stripping the old interior back to the concrete shell and applying a new finish — pebblecrete, quartzon, render or tiles. It is a significant job that typically takes one to two weeks and costs anywhere from $8,000 to $25,000 depending on the finish and pool size. You will need to do this every 10 to 15 years.

Fibreglass pool resurfacing involves sanding back the old gelcoat and applying a new gelcoat topcoat. If the underlying fibreglass is in good condition, it is a relatively straightforward process. If there are deeper issues like osmosis or structural damage, the fibreglass layer may need patching or rebuilding in places. Most fibreglass resurfaces take 5 to 10 days. For the full process, see our guide to the pool resurfacing process.

Here is the option many concrete pool owners do not know about: you can convert a concrete pool to a fibreglass interior. BRE Fibreglass does this regularly on the Gold Coast. The existing concrete shell stays in place, and we apply a hand-laid fibreglass and gelcoat system over the top. It gives you all the low-maintenance benefits of fibreglass without the cost of demolishing your existing pool. Read more in our concrete to fibreglass conversion guide.

Design and Shape Flexibility

This is one area where concrete genuinely wins. Because a concrete pool is built on site from scratch, it can be any shape, size or depth you want. If you have an unusual backyard layout, want an infinity edge, or need a very specific design, concrete gives you complete freedom.

Fibreglass pools come in pre-made moulds, so you are choosing from a range of existing shapes and sizes. The range is wide — most manufacturers offer dozens of designs from plunge pools through to large family pools — but you cannot customise the shape the way you can with concrete. That said, most standard backyards are well served by the fibreglass options available.

Comfort and Feel

Fibreglass is smooth and comfortable underfoot. Kids can play without scraping their feet, and sitting on the steps or ledges is actually comfortable. Concrete pool interiors — particularly pebblecrete — are rough by nature. That roughness gets worse as the surface ages, and many pool owners eventually resurface purely because the floor has become too abrasive for bare feet.

So Which Is Better?

There is no single right answer — it depends on what you prioritise. Here is a rough summary:

• Choose fibreglass if: you want lower ongoing maintenance, reduced chemical costs, a smoother surface and a pool that is easy to look after week to week.
• Choose concrete if: you need a fully custom shape, a very large or unusually designed pool, or you have specific architectural requirements that fibreglass moulds cannot accommodate.
• Already have a concrete pool?: You do not have to choose between the two. A fibreglass conversion lets you keep your existing pool structure while gaining all the benefits of a fibreglass interior.

For most Gold Coast homeowners, fibreglass is the more practical option. The lower running costs, easier maintenance and longer surface life make it hard to beat for everyday family pools. But if you need something truly custom, concrete still has its place.