Sydney — Tier-1 Pillar

Sydney Apartment Renovation — Strata Consent, Acoustic Isolation, Building Manager

Sydney apartment renovation reality. Owners Corporation consent under SSMA 2015, acoustic isolation under NCC F5, common property waterproofing, building manager coordination, lift access agreements. A$85K-A$220K typical.

~2 min read·Updated 2026-04-23

Sydney apartment renovations succeed or fail on the Owners Corporation, not the builder. Under the Strata Schemes Management Act 2015 any work affecting common property — waterproofing, acoustic layer, facade, services risers, balcony balustrading — requires Owners Corporation resolution. Many schemes go further and require a Section 110 special-resolution by-law with 75% of unit entitlements in favour. A hostile or risk-averse Owners Corporation can block a renovation for 6-12 months.

Layer on acoustic isolation to meet NCC Section F5 (airborne and impact sound between dwellings), common-property waterproofing that sits on the lot boundary, building-manager coordination, strict work-hour limits in most buildings (often 8am-4pm weekdays only), and lift-access protocols — and the renovation becomes a coordination sport.

AskBaily routes your Sydney apartment renovation to a builder who carries strata-renovation references, has negotiated by-laws across multiple schemes, and manages building-manager relationships in real time.

What a Sydney apartment renovation involves

Owners Corporation consent. SSMA 2015 resolution or special-resolution by-law. Expect 4-16 weeks.
Acoustic. NCC F5 airborne (Rw+Ctr 45+) and impact (Ln,w 62-) requirements between dwellings. Acoustic consultant report where structural alterations affect the separating layer.
Waterproofing. AS 3740-2021 on wet areas. Waterproofing certificate retained with title. Common-property membrane may require a registered by-law transferring liability.
Fire. NCC Volume One fire-separation rules on any alteration affecting separating walls, fire doors, or services penetrations.
Building manager + lift booking. Lift access often requires a refundable deposit (A$1,000-A$5,000) and scheduled slots. Rubbish removal restricted.

Frequently asked questions

What Owners Corporation consent do I need for a Sydney apartment renovation? For work not affecting common property, standard lot-owner permission (often administrative). For work affecting common property — waterproofing, balconies, facades, plumbing risers — a special-resolution by-law under SSMA 2015. Minor bathroom refits sometimes sit under a "common-property minor works" by-law in newer schemes.

Can the Owners Corporation block my apartment renovation? Yes, within reason. A special resolution can be refused. A common route when OC is slow is a NCAT strata application to compel a vote or dispense with consent where the OC is unreasonably withholding.

How much does a Sydney apartment renovation cost? A$85,000-A$130,000 for a mid-spec 2-bedroom apartment refresh. A$140,000-A$220,000 for a high-spec renovation with full kitchen, bathroom, flooring, and joinery. A$250,000-A$650,000 for a prime-east or harbourside apartment with structural alterations and imported fixtures.

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“A string of bright beads of sunlight, breaking through the valleys along the moon’s rim.”

— Francis Baily, 1836

Origin

Who is Baily?

Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.

He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.

That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.

Baily was a businessman before he was a scientist. That’s our vibe too.

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