Construction Starts Just Dropped 29%. That Is the Most Important Number in Self-Storage Right Now.

The number that changes the conversation

You have been reading rate-compression headlines for over a year. Street rates down 2.4%. Twenty-six of thirty metros negative. Occupancy holding. Revenue flat. Every buyer wondering when the pressure eases.

That question has a new answer. Yardi Matrix’s August 2026 report landed, and one number jumps off the page: Q1 2026 construction starts — the number of new projects that broke ground — are down 29% compared to the same quarter last year (Yardi Matrix Monthly Self Storage Report, August 2026).

Not down a little. Down nearly a third.

Construction starts are the leading indicator for everything else. A start today becomes a delivery in 12 to 18 months. When starts drop 29%, the units that would have hit the market in 2027 and 2028 are not coming.

The supply forecast has already been revised down: Yardi now expects roughly 45 million NRSF of new supply in 2027 and roughly 38.6 million NRSF in 2028. For context, 2026 deliveries are tracking at about 52.9 million NRSF (per StorageCafe). The trend is clear — the pipeline is shrinking.

What the pipeline data actually says

The under-construction figure right now — 44.1 million NRSF, or 2.1% of existing inventory — is the stock-in-progress from starts that already happened. That number has been contracting for months: down 10 basis points month-over-month, down 0.4% year-over-year.

The September edition of the same report adds precision: 43.8 million NRSF under development, down 40 basis points year-over-year. The pipeline is not just slowing in starts — total square footage under development is contracting in absolute terms. Phoenix still carries the deepest pipeline at 6.2% of stock, and the national average asking rate sits at $16.39 per square foot.

But the 29% drop in starts tells you what comes next. The units currently under construction will deliver. The ones that would have followed them are being cancelled or delayed.

This is the mechanism that eventually ends rate compression. Supply stops growing, occupancy stabilizes, and operators regain pricing power. It does not happen overnight — the units already in the pipeline still deliver. The direction of travel just changed.

The other signal in the same report

Fifteen of the top 30 metros showed stronger year-over-year rate growth in July than in June. That is not a recovery yet. It is a hint that the rate of decline is slowing in specific markets — Austin and Los Angeles leading.

Not all markets are under the same pressure. Sunbelt markets — Florida, Las Vegas, Phoenix — still carry heavy supply. Northeast and Midwest markets — Boston, Chicago, Minneapolis — are posting healthy revenue growth. The national average masks a wide dispersion.

Why builders stopped breaking ground

The starts drop is not an accident. The first public benchmark on self-storage construction costs — released by TractIQ and ARCO/Murray Design Build and covering 100+ completed projects across 27 states — puts the median hard cost for a class A facility at $84.23 per gross square foot, up 47% since 2021. Sitework alone went from under 8% of project budget in 2016 to nearly 20% today.

And the supply chain is showing cracks. SteelBlue, which manufactures building components for self-storage facilities, filed for bankruptcy this quarter. When component manufacturers fail, the cost and the timeline for new builds go up.

Developers are rational. The financing math for new development does not pencil at today’s rates and construction costs. The starts drop is their spreadsheet speaking.

The zoning door is closing too

Atlanta — the #1 self-storage construction market in the country at 2.4 million square feet delivered in 2025 — voted 15-0 on October 7 to end by-right storage development. New projects now need a special-use permit: a discretionary approval that invites hearings, opposition, and months of uncertainty.

Existing facilities in supply-constrained markets are the assets that hold their value. Every city that closes the by-right door makes the entitled site worth more.

What it means for someone buying today

Here is the question this data answers: should I wait for rates to improve before I buy?

First: if you underwrite a deal at today’s rates and the numbers work, the deal works. You do not need the market to improve. You need the facility to cover its nut at the rates people are paying right now.

Second: the supply data says the operating environment twelve to twenty-four months from now is likely better than it is today. The units competing with your facility are being built now. The ones that would have been built later are getting cancelled. That is a tailwind — not one you underwrite into, but one you should know is there when you hold.

Conservative underwriting is your shield. Do not buy a pro-forma propped up by assumed 3% annual rate growth. Buy one that works at $16.47 a square foot. If it does, the supply contraction makes your hold period easier, not harder.

The institutional vote of confidence

The same report notes 44.1 million NRSF under construction. That is still a lot of units. Now compare: 57.9 million NRSF delivered last year. 52.9 million expected this year. 45 million projected next year. The numbers are all moving in the same direction.

And the capital is voting with acquisitions, not ground-up development. SmartStop committed up to $300 million to its Canadian joint venture with ICM Bluebird — rebranded Strategic Storage Canada LP, 14 properties, a 5-year management term — while selling $75–125 million of underperforming secondary-market assets to fund the rotation. Storage King USA, the private portfolio run by Andover Properties, crossed 15 million square feet and 100,000 units — institutional scale without the public-REIT structure.

The market is voting. Construction is slowing because the financing math for new development does not pencil, and the capital is rotating into what already exists.

Trust, but verify

Open the Yardi report yourself. Look at the starts data. Then look at your target market’s under-construction pipeline. If the metro you are buying in has heavy supply in the pipe, wait. If it is a tertiary market where nothing meaningful is being built, the 29% starts decline is a reason to move sooner rather than later.

Run the numbers

Run the numbers, not the headlines. Construction starts just dropped 29%. That is a signal, not a guarantee. The question is whether the facility in front of you covers debt service at today’s street rates. If it does, you are buying into a market whose supply picture gets better — not worse — the longer you hold. If it does not, no amount of starts data saves a bad underwrite.