Adelaide hasn't been falling. That's exactly why the next 18 months matter.

There's a question we've been asked a lot this month, in various forms: when do Adelaide prices stop falling?

It's the wrong question, and the reason it's wrong is worth understanding.

Where the market actually sits

Adelaide dwelling values are up 10.5% over the year to July 2026. The median dwelling sits at roughly $945,000, with the typical house just above $1 million. Values peaked in May and have since eased about 0.4%.

That is not a falling market. That is a market that has just turned.

Compare it to what's happening elsewhere. Over the June quarter, Sydney house prices fell 3.3% and Melbourne 3.1%. Auction clearance rates in both cities are sitting below 50%, a level that has historically preceded sustained price declines. Adelaide's clearance rate has been tracking around 73%.

Three rate rises in the first half of this year took the cash rate from 3.60% to 4.35%. The RBA held in June and again in August, but Governor Bullock has been explicit that the board isn't ruling out further increases. Markets are pricing roughly a 60% chance of one more hike by year end.

So the honest framing is this: Adelaide's downturn hasn't finished. It has barely started.

Why Adelaide is running late

Adelaide entered this cycle from a position of unusual strength — tight supply, a rental vacancy rate near 0.9%, and steady interstate demand. Those fundamentals delayed the impact of higher rates by roughly nine to twelve months relative to Sydney and Melbourne.

Delay is not immunity. It means Adelaide's peak came later, its decline starts later, and — critically — its trough will arrive later too.

Most national commentary currently points to a recovery beginning around mid-2027. Applied to Adelaide without adjustment, that's misleading. If Adelaide is nine to twelve months behind the national cycle on the way down, it will be behind on the way up as well.

Five scenarios

We've modelled Adelaide's median dwelling value quarterly through to December 2031 across five paths, weighted by how likely we consider each.

Base case (40% weight). The cash rate holds at 4.35% through 2026, with the first cut arriving mid-2027. Adelaide falls roughly 6% peak to trough, bottoming around the September quarter of 2027 — a sharper decline than most expect, but a shorter one. Values stabilise through late 2027 and growth resumes properly from mid-2028. The May 2026 peak is regained in the second half of 2029, with the median reaching roughly $1.06 million by the end of 2031.

Early recovery (20%). Inflation eases faster, cuts begin in the first half of 2027, and Adelaide's supply constraints put a hard floor under prices. A shallow 3% decline, trough in early 2027, back to peak by early 2028.

Soft floor (10%). Cuts begin as early as Q4 2026 and the correction never really materialises — a 1.3% dip and nothing more.

Higher for longer (22%). One further hike to 4.60%, no cuts until the second half of 2028. An 11% peak-to-trough decline bottoming in late 2028, with the peak not regained inside the forecast window.

Broad correction (8%). Inflation proves sticky, unemployment pushes past 5%, and forced selling appears. A 17% decline troughing in mid-2029.

The variable most people are ignoring

The May 2026 Budget restricts negative gearing on established residential property and changes the capital gains discount, both from 1 July 2027.

That date matters more than it looks. It lands almost precisely when the first rate cut would otherwise begin lifting borrowing capacity. Two forces, opposite directions, same quarter.

Our base case has the market bottoming almost exactly as the tax change lands. That timing is the reason the recovery in our modelling is unusually shallow through its first year — quarterly gains under 1% rather than the sharp V-shaped rebound some forecasters are pencilling in. A market can absorb rate relief or a structural change to investor economics. Absorbing both in the same quarter takes longer to convert into price growth. And because Adelaide's recent cycle has been unusually investor-driven, we think the local market is more exposed to this than most national forecasts allow for.

What this means practically

If you're holding, the buffer is substantial. Adelaide values have risen 68.5% over five years. Even the 17% scenario returns the median to roughly where it sat in 2024.

If you're buying, the base case suggests the window of best value is mid-2027 through early 2028 — not now, and not in 2026. But timing a trough precisely is something almost nobody manages, and a well-selected property bought slightly early beats a poorly selected one bought at the exact bottom.

If you're selling, the next six months are likely the strongest conditions you'll see until 2029 under our base case. That's worth weighing seriously.

The thing to avoid is reading national headlines about a property crash and assuming they describe Adelaide. They don't - yet.

Sources: Cotality Home Value Index (July 2026), RBA Statement on Monetary Policy (August 2026), ANZ Research, KPMG Residential Property Market Outlook, Domain FY2027 Forecast Report.

This article contains general information only. It does not take into account your objectives, financial situation or needs, and it is not financial or investment advice. Scenario modelling reflects assumptions that may prove incorrect. Please seek advice specific to your circumstances before acting.