Reading a supply pipeline without a planning degree
A supply pipeline moves through three distinct stages, approvals, commencements and completions, and knowing which stage a suburb is in matters more than the headline approval number itself.
Three stages, one number worth watching
Every development pipeline, in every suburb, passes through the same three stages: approvals, commencements and completions. Coverage of a “record pipeline” almost always means approvals, the earliest and least reliable stage. Understanding the gap between the three stages is the difference between reading a pipeline correctly and reacting to a headline that describes it.
Approvals: the leading indicator that overstates
An approval is a council or state authority signing off on a development application. It’s the first public data point, which is why it drives headlines, but it’s also the stage furthest from anything actually being built. Approved projects get shelved when finance conditions tighten, redesigned when construction costs move, or simply sit on a developer’s books for years waiting for the right pre-sale numbers. Our growth score treats new supply pressure as a negative-weighted input worth 5%, deliberately the lightest weight in the model, precisely because approval volume alone is a weak predictor of what actually lands.
Commencements and completions: where the pipeline gets real
Commencements, construction physically starting, are a much better signal, though still twelve to twenty-four months from delivering finished stock in most apartment developments. Completions are the number that actually affects a suburb’s rental supply and, eventually, vacancy and price. The gap between an approval and a completion is commonly three to five years for a mid-rise apartment project, longer for anything requiring rezoning first.
A useful habit: compare current approvals to the suburb’s five-year average, not to last quarter’s figure. A suburb approving 300 dwellings a year against a five-year norm of 120 is a genuinely different signal from one approving 300 against a norm of 280.
- Approvals tell you what a developer wants to build and thinks it can sell.
- Commencements tell you what’s actually funded and under construction.
- Completions tell you what will hit vacancy and rental listings, typically years later.
Why apartments matter more than houses for this metric
House supply tends to add to a suburb gradually, lot by lot, and rarely moves the vacancy rate on its own. Apartment supply is lumpy: a single 200-unit tower completing in one quarter can shift a suburb’s rental vacancy more than two years of detached-house construction combined. Fortitude Valley, a unit-dominated market with 78% renters, is the kind of suburb where this matters most; a wave of completions can loosen vacancy fast, exactly what we’re seeing there now at 2.5%, up from tighter readings a year earlier.
The approval number is what gets announced. The completion number is what a tenant, or a landlord, actually feels.
Woolloongabba illustrates the other side of the same mechanic: a Priority Development Area zoned ahead of a fixed 2032 deadline concentrates completions into a narrower window than a typical inner-city precinct, which is part of why its risk rating sits at Medium despite an 86 growth score.
The bottom line
Approvals, commencements and completions are three different facts, not three names for the same thing, and only the last one changes what a suburb’s rental market actually feels like. Reading a pipeline correctly means asking which stage the number belongs to before deciding what it implies.