Flooring for Apartments in NZ: The G6 Acoustic Guide

There's a particular frustration that comes with apartment living: the footsteps overhead at 6am, the click of heels on a hard floor above your ceiling, the sense that your neighbour's day is playing out through your living room. It's also the reason choosing flooring for apartments in NZ is rarely as simple as picking a colour you like. Above almost every multi-unit floor sits a set of acoustic rules — and a body corporate watching closely.

The good news is that you can have the warmth and timber look of a hard floor in an apartment without becoming the neighbour everyone complains about. It takes an understanding of NZBC Clause G6, the right acoustic product, and a little paperwork. This guide walks through what the Building Code requires, how hard floors gain approval, what your body corporate will expect, and how to choose a floor that's as quiet as it is refined.

What Acoustic Rules Apply to Apartment Flooring?

Sound between apartments is governed by Clause G6 Airborne and Impact Sound — the part of the Building Code dedicated to keeping noise from travelling between separate households. For anyone specifying or renovating an apartment, it's the single most important standard to understand before a floor goes down.

What NZBC G6 requires

G6 sets minimum acoustic performance for the building elements shared between tenancies. As Building Performance sets out, inter-tenancy walls, floors and ceilings must achieve a Sound Transmission Class (STC) of no less than 55, and inter-tenancy floors must also reach an Impact Insulation Class (IIC) of no less than 55. For an apartment floor, both numbers apply — it has to resist airborne noise and footfall alike.

When G6 applies

It's worth knowing where the clause stops. G6 applies only to connected dwellings — the floors, walls and ceilings shared between neighbouring occupancies. Where dwellings aren't physically connected there's no G6 requirement for sound insulation, no matter how close they sit. So the rules bite hardest in apartments and stacked tenancies, exactly where impact noise travels most readily.

STC versus IIC, in plain terms

The two ratings measure different problems. STC describes how well an assembly blocks airborne sound — voices, music, a television. IIC describes how well a floor absorbs impact sound, the footsteps and dropped objects transmitted from the unit above. A bare concrete slab handles airborne noise reasonably well but, as Medium Density NZ notes, will faithfully transmit every footstep to the home below. That's why the floor covering you choose matters so much for IIC.

It's also worth treating 55 as a floor, not a ceiling. The Code's minimum still lets a fair amount of noise through, and acoustic specialists commonly recommend aiming higher — often toward 60 to 65 — for medium-density homes where comfort genuinely matters. A floor that comfortably clears the minimum gives you headroom against real-world variables like flanking and installation tolerances.

Can You Install Hard Flooring in an Apartment?

This is the question we hear most often, and the honest answer is: yes, but not by default. Hard flooring is entirely achievable in an apartment — it simply has to be proven, rather than assumed, to meet the impact standard.

Hard floors as an Alternative Solution

Tile, timber, vinyl, LVT and hybrid floors can all be specified in an apartment, provided they can be shown to achieve an IIC of 55. Because these sit outside the Acceptable Solution, they're approved as an Alternative Solution. In most cases that means pairing the floor with an acoustic underlay, or choosing a product with an acoustic layer built in. A rigid hybrid floor with an integrated acoustic backing and specialised acoustic core construction is one of the more elegant ways to meet the standard without a separate underlay system.

Verifying compliance through field testing

The proof comes from testing. As Agile Engineering describes, an Alternative Solution is verified using Verification Method G6/VM1, with sound-test results required to fall within 5 dB of the 55 dB target. Critically, these tests are carried out on site by an acoustic engineer — Auckland Council confirms field tests follow ISO 140-4 for airborne sound and ISO 140-7 for impact sound. A laboratory figure from a product brochure is a useful indication, but it's the in-situ field result, measured through your actual floor and ceiling, that demonstrates compliance.

There's one practical exception worth knowing. For side-by-side household units such as townhouses, Auckland Council notes a field test isn't always required where the proposed inter-tenancy system is already a tested and proven one — instead, the council inspects the build at the pre-line, post-line and final stages to confirm it's been constructed as specified. In stacked apartments, where impact noise travels vertically, field testing remains the norm. Either way, the message is the same: choose a system with a documented acoustic pedigree, and install it precisely.

How Acoustic Underlay and Acoustic Flooring Work

Understanding the science behind these products makes specification far less daunting. Acoustic performance isn't magic — it's resilient separation, engineered to interrupt the path that impact energy takes through a floor.

Reading impact sound data

When you compare acoustic products, the figure to look for is the impact sound reduction, often expressed as ΔLw or, ‘the Delta’ - the difference a product and its underlay make to impact noise compared with a bare slab.

Acoustic-backed hybrid versus separate underlay

There are two broad approaches. The first lays a hard floor over a separate acoustic underlay layer. The second uses a product with the acoustic layer bonded to the plank and ideally a core specifically engineered for sound reduction, creating a single-layer acoustic system that installs as one floor. Our acoustic flooring range takes the second path, integrating resilient separation into the board itself — a cleaner install with consistent, engineered performance across the floor.

Flanking noise and the whole assembly

One detail catches out even careful renovators. Sound doesn't only travel straight down through a floor; it can move sideways through adjoining structure — into a floor, under a wall, and out into the room beyond. This is flanking noise, and it's why G6 compliance is a property of the entire floor and ceiling assembly, not the floor covering alone. Specifying a strong acoustic floor is essential, but it works best as part of a well-considered build-up.

What Will the Body Corporate Require?

In a New Zealand apartment, the Building Code is only half the story. The body corporate has its own say, and overlooking it is one of the more expensive mistakes an apartment owner can make.

The Unit Titles Act 2010 and operational rules

Most apartments are owned under unit title, a structure governed by the Unit Titles Act 2010. The body corporate — made up of all unit owners — can set operational rules that manage how the building is used, and these are enforceable. As Unit Titles Services notes, the way an owner uses their unit can affect the neighbours, and floor coverings are a frequent subject of those rules.

Replacing carpet with a hard floor

If you're lifting carpet and laying timber, tile or hybrid, expect to seek approval first. Many body corporates require a written proposal, an acoustic underlay to a specified standard, and sometimes an acoustic engineer's report confirming the new floor will perform. Some go further, asking for a bond before work begins, or restricting hard floors above the bedrooms of neighbouring units. The smart sequence is to confirm your building's rules, choose a compliant acoustic product, and gather the documentation before the install begins — not after.

Timing matters as much as paperwork. Body corporate committees meet periodically, so an approval that depends on a committee decision can take weeks to secure. Building that lead time into your renovation schedule keeps the project moving and avoids the awkward position of having product on site and no consent to lay it.

Avoiding disputes

The risk of skipping this is real. Hard-floor noise is one of the most common sources of friction between unit owners, and disputes can be escalated to the Tenancy Tribunal, which handles unit title matters. An owner who installs a non-compliant floor without consent can be ordered to put it right. Doing it correctly the first time — with the right acoustic floor and the body corporate on side — saves both the cost and the conflict.

How Do You Choose the Right Apartment Floor?

With the rules understood, the choice becomes far more enjoyable. The goal is a floor that satisfies G6, clears the body corporate, and still delivers the look and feel you wanted in the first place.

Acoustic hybrid: timber looks without the noise

For most apartments, an acoustic hybrid is the natural fit. It offers the appearance and underfoot feel of genuine oak with engineered impact-sound performance designed for New Zealand's acoustic requirements. Our DuracoreSilent acoustic hybrid was created for exactly this challenge — One busy Auckland household, with four boys and a small menagerie of pets, found its patented acoustic core absorbed  up to 30% more ambient noise than their previous hard floor , all while shrugging off the daily mess of family life.

Matching the product to your building

No two buildings are identical, so the strongest specifications pair the right product with the right advice. Where compliance must be demonstrated, an acoustic engineer's field test through your specific floor and ceiling assembly is the definitive check. We're glad to help you select a product whose performance gives that field test the best possible head start.

Aesthetics and compliance, together

The old assumption that quiet apartments mean carpet no longer holds. A well-engineered acoustic floor lets you run a refined, timber-look surface through your apartment while meeting the impact standard the Code and your neighbours expect. If your apartment also includes a kitchen, bathroom or laundry, those wet areas carry their own rules — our guide to E3/AS1 wet area flooring requirements covers how the same hybrid floors stay compliant there too.

Specifying With Confidence

Flooring an apartment well comes down to four things: knowing that G6 sets an STC and IIC target of 55 for inter-tenancy floors, treating any hard floor as an Alternative Solution proven by field testing, clearing the body corporate's requirements early, and choosing an acoustic product engineered to perform. Get those right, and beautiful hard flooring in an apartment stops being a compromise.

At Ecodure Flooring, we help apartment owners, architects and developers specify acoustic flooring that meets NZBC G6 and keeps the peace between neighbours — backed by products proven in real New Zealand homes. To find the right floor for your apartment, talk to the Ecodure team and let's get the acoustics, the compliance and the look working together.