Measurement & report to the noise regulations
Field measurement to ISO 16283 in the receiving room, a level-difference result and a written report you can hand to a strata manager, a shire or a solicitor.
from $1,250Osborne Park · acoustic treatment & noise assessment
Quietline AcousticsParty walls, studios and boundary noise across Perth's inner suburbs.
We'll tell you what a wall can do. It's usually less than you've been promised. Pick a build below — the section draws every layer to scale and tells you what arrives, including the jobs we say no to.
Operating since 2016field measurement to ISO 16283$20m public liability
At rest, as set below
12dB
UNDER THE ASSIGNED LEVEL
RatingRw 52
Arriving23 dB(A)
Estimate$7,486
This is a screening figure. Rw is a laboratory single-number rating and the real level difference also depends on the room, the area and every flanking path around the wall. We measure before we quote for real.
The Wall — screening estimator
$7,486 · 12 dB under
Rw 52 · 18 m² · resilient channel
Screening figure — Rw is a laboratory rating. We measure on site before we quote.
BuildWhat we'd put between the two rooms. Rw and Ctr are the tested system's figures, not a promise about your wall.
This is what you've got, drawn to scale.
Wall areaFace area of the wall we're treating.
18m²
Extras
SourceWhat's on the other side.
Receiving roomAssigned levels shaped by the Environmental Protection (Noise) Regulations 1997 (WA).
What's on the other side doesn't change what a wall costs to build; it changes whether the wall is the right answer.
What that's made of
Send this screening to us
No obligation, and we'll tell you if a wall isn't the answer.
What we do
Six things, priced the way we actually bill them.
Rates are per square metre of wall face. Every construction job carries a $2,400 minimum and $780 for attendance, setout and make-good. The report is the only line you can buy on its own.
Insulate and add a second 13 mm layer
Strip one face, R2.0 batt in the cavity, two layers of board back on with staggered joints. The cheapest honest improvement on a stud wall — about ten decibels.
$168 per m²Resilient channel, two layers and batt
Steel channel breaks the board's contact with the studs so the wall stops behaving like a drum skin. Our most-fitted system in strata party walls.
$246 per m²Discontinuous double stud
Two separate 70 mm frames with a 25 mm gap between them — the leaves never touch. Costs you 90 mm of room and buys you the biggest number on this page.
$385 per m²190 core-filled block with furred board
Mass instead of separation. Best where you have the floor loading and the room for it — plant rooms, bin stores, a shared wall in a warehouse conversion.
$470 per m²Perimeter isolation / acoustic door set
Backing rod and acoustic sealant to every edge, and a solid-core door on full perimeter and drop seals. A great wall with a hollow-core door is not a great wall.
+$46 per m² / +$1,450The Rw and Ctr figures we quote are the tested system's laboratory ratings under AS/NZS 1276.1 and ISO 717-1 — indicative of the system, not a promise about your wall. Your result depends on the room, the area and every flanking path around the wall.
Credentials
Operating since 2016 out of Osborne Park, across Perth's inner and western suburbs.
Systems rated to AS/NZS 1276.1 and ISO 717-1; field measurement to ISO 16283.
NCC Part F7 work for strata — Rw + Ctr ≥ 50 between sole-occupancy units.
$20m public liability, certificate on request before we start on site.
A written screening before any quote over $5,000 — you see the number before you see the invoice.
ABN 00 000 000 399 · membership AAS-0000 (both placeholder patterns on this demonstration page).
What people say
Three jobs, told straight.
Our party wall was signed off at practical completion and I could still hear the neighbour's television. Quietline measured it and it came back nine decibels short of what the drawings claimed. The report is what got the builder back.
Apartment owner · Subiaco
We had a complaint and a letter from the shire. They did the measurement, wrote it up against the regulations and told us which two things to change. The shire accepted it. No drama, no theatre.
Publican · Leederville
We were about to spend forty thousand dollars lining four walls. They measured first and told us the floor was the problem, not the wall. That conversation cost us twelve hundred and saved the rest.
Strata council · Mount Hawthorn
Where we work
Osborne Park out to the coast, the river and Fremantle.
Strata and residential across the inner and western suburbs; commercial and plant-noise work anywhere in the metro area. Beyond that we'll tell you honestly whether the travel is worth it to you.
Osborne Park · Mount Hawthorn · Leederville · Wembley · Subiaco · Nedlands · Victoria Park · Fremantle — and the rest of the metro area for commercial and plant-noise work.
Questions we get
Six answers, before you ring.
What does Rw actually mean, and why isn't my builder's number my result?
Rw is a laboratory single-number rating for a wall system tested to AS/NZS 1276.1 and rated to ISO 717-1 — one wall, one test chamber, no flanking. Your wall has a floor slab under it, a ceiling over it, services through it and a door beside it, and sound goes around a wall as happily as it goes through one. A field level difference is almost always lower than the laboratory Rw. That's why the number on this page is called a screening figure and why we measure before we quote for real.
Why is bass a different problem, and what is Ctr?
Rw is weighted towards speech. Ctr is a low-frequency spectrum adaptation term under ISO 717-1 — a correction, usually between −4 and −9, that you add to Rw when the noise on the other side has real bass in it: a subwoofer, a kick drum, a dropped barbell, a condenser fan. On this page the gym, the band and the plant source all take the Ctr correction and the television doesn't. That single number is why a wall that handles a neighbour's conversation does nothing at all for their drum kit.
What are the WA assigned levels and who do they apply to?
The Environmental Protection (Noise) Regulations 1997 (WA) set assigned levels at a noise-sensitive premises, adjusted by time of day and by the character of the noise. The shape of it is what the receiving-room chips reflect: a bedroom at night is the hardest number to meet, an office in the daytime is the easiest. Between apartments there's a separate bar — NCC Part F7 asks for Rw + Ctr ≥ 50 between sole-occupancy units. We'll tell you which one is actually binding on your job, because it isn't always the one you were told about.
Can a wall on its own ever fix a gym or a band?
Usually no, and we'd rather say it here than at the quote. Low frequency travels through the structure — the slab, the studs, the ceiling — not just through the wall face. Drive the band source into a bedroom on this page and every one of our five builds is still over the assigned level, the best of them by eleven decibels. That job is a room within a room and a floor, and it starts with a measurement, not a wall quote.
What does a measurement cost and what do I get?
$1,250. We come to the receiving room with a calibrated sound level meter and a source, measure the level difference to ISO 16283, and write it up against the regulations or the NCC clause that applies to you. You get the measured figures, the standard we used, what we think is causing it and what would change it — as a document you can give to a strata manager, a builder, a shire or a solicitor. It's the only thing on this page you can buy on its own, and on some jobs it's the only thing we'll sell you.
What do you not do?
We don't certify someone else's construction — we can measure what it does, but we won't sign that it was built to a drawing we never saw. We don't sell a treatment we've already told you won't get there; if our own screening says the gap is positive, the measurement comes first and the wall waits. And we don't quote an acoustic result as a guarantee. We'll tell you what the system is rated at, what we measure, and what we'd do next.
Book a screening
Tell us what you can hear.
We'll ring you back within one business day, talk through what you've got, and book a screening or a measurement. If we think a wall isn't your answer we'll say so on the phone.
This is a demonstration build by Sapience Analytics. Want one pointed at your customers?
Every number on this page is computed live from a model we can point at your real rates, your real service area and your own booking system. If you run a trade in Perth and your website is a brochure, we'd rather build you a page that does the first half of the quote before the phone rings.