It's one of the first questions every client asks us at Acorn: solid or engineered? Both are genuine timber, both bring warmth and character into a home, and both can look absolutely stunning underfoot. But they behave very differently once they're installed — and the right choice depends on where you live, what's beneath your floor, and how you want the finished result to feel.

Here's how we break it down for our clients.

What's the difference?

Solid timber flooring is exactly what it sounds like — a single, solid piece of timber milled from a log, tongue-and-groove profiled, and fixed directly to the subfloor. What you see on the surface continues all the way through the board.

Engineered timber flooring is made up of a real timber wear layer (the part you see and walk on) bonded over several layers of cross-laminated plywood or high-density fibreboard. The top layer is genuine hardwood — often the very same species and grade as solid boards — but the core construction underneath is engineered for stability.

Both are real wood. The difference is entirely in the construction beneath the surface, and that construction is what determines how each product performs.

Stability and movement

This is the single biggest practical difference between the two, and it's the one that matters most in the Australian climate.

Solid timber is a natural material that expands and contracts with changes in humidity and temperature. Sydney's swing between humid summers and dry winters means solid floors need generous expansion gaps, careful acclimatisation before installation, and ongoing awareness from the homeowner — gaps can open up in winter and boards can occasionally cup or gap slightly with the seasons.

Engineered timber's cross-layered core largely cancels out that natural movement. The layers run in alternating directions, which locks the board dimensionally stable even as conditions change. This makes engineered flooring the safer, lower-maintenance choice in most Sydney homes — and it's why we specify it almost universally for larger open-plan spaces, homes with hydronic or in-slab heating, and anywhere with less-than-ideal climate control.

Where each one can be installed

This is often the deciding factor before aesthetics even come into it.

• Solid timber needs to be nailed or secret-nailed to a timber subfloor or batten frame. It's not suitable for installation over concrete slabs on ground level or below-ground applications, and it's generally not recommended over underfloor heating.
• Engineered timber can be installed almost anywhere — nailed, glued, or floated over concrete slabs, timber subfloors, on-ground and below-ground levels, and it's compatible with hydronic underfloor heating (subject to the specific product's rating).

If you're in an apartment, a slab-on-ground home, or a renovation where the subfloor situation is uncertain, engineered is very often the only viable option — and it's also the format that pairs correctly with acoustic underlay systems like REGUPOL, which most Sydney strata buildings require for hard flooring installations.

Appearance and feel

Here's the good news: once installed and finished, a quality engineered floor is genuinely indistinguishable from solid timber to the eye and underfoot. The wear layer is real, solid hardwood — the same species, the same grain, the same colour variation. Wide-format European oak boards, in particular, are almost always engineered, simply because timber this wide would be structurally unstable as a solid board.

Solid timber does offer one genuine point of difference: because the timber runs through the full thickness of the board, it can be sanded and refinished more times over its life, and some purists feel there's a subtle difference in underfoot feel and acoustic resonance. For a heritage home or a period-accurate restoration, solid timber remains the traditional choice.

Longevity and refinishing

Both products can last for decades when properly cared for, but they differ in how many times they can be resurfaced:

• Solid timber (typically 19mm thick) can generally be sanded and refinished multiple times — often 4–6 times or more — over its lifetime, which can extend well beyond 50 years.
• Engineered timber can also be sanded and refinished, but the number of times depends on the thickness of the top wear layer. Premium engineered boards with a 4–6mm wear layer can be refinished 2–3 times, giving a lifespan of several decades with proper care. Thinner wear layers offer more limited refinishing.

If longevity through repeated refinishing is your top priority and your subfloor allows it, solid timber has the edge. For most homes, though, a quality engineered floor with a solid wear layer will comfortably outlast the time most people stay in a property.

Cost

Pricing varies considerably by species, grade and board width, but as a general rule engineered flooring tends to sit at a comparable or slightly lower price point than an equivalent solid timber product, largely due to more efficient use of premium timber in the wear layer. Installation costs can also be lower for engineered floating floor systems compared with the labour involved in nailing solid boards. That said, at the premium end — wide European oak boards, specialty finishes, bespoke colour matching — engineered flooring is very much a premium product in its own right, not a budget compromise.

So which should you choose?

As a general guide:

• Choose engineered if you're in an apartment or strata building, installing over a concrete slab, want wide-format European Oak boards, need compatibility with underfloor heating, or want a more dimensionally stable floor with less seasonal movement.
• Choose solid if you're working on a heritage or character home where solid boards are original or expected, you have a suitable timber subfloor, and long-term repeated refinishing is a priority.

For the vast majority of our Sydney clients — particularly anyone in a multi-residential building or renovating over a concrete slab — engineered timber is the practical and increasingly the preferred choice, without any compromise on the authentic timber look people come to us for.

Not sure which is right for your home? Bring your floor plan or subfloor details into our Surry Hills showroom, or give us a call on (02) 9167 3624. We'll walk you through the right timber, board width and construction for your space — and make sure whatever you choose is installed to last.

‍

‍