Most people in the industry carry the same calendar in their heads: spring is the season for apartments, January and February are dead “after the holidays”, and real sales begin once it gets warm. It’s an intuition so common that few question it — and few check it against the data.
And the data says the opposite.
In a typical year the strongest quarter for developer sales is the fourth, not the second. December 2025 closed with sales roughly 76% higher than January. The first quarter — contrary to the popular “spring rebound” — is regularly the weakest.
This isn’t a curiosity. It’s the difference between launching sales in a window when the market is buying, and launching them when we merely think it should be. And for a developer planning the start of a phase’s sales or a marketing budget for the year, that difference costs real money and real weeks.
This text is about what apartment-sales seasonality actually looks like, why intuition gets it wrong — and about something more important: when seasonality stops applying, because 2026 showed it with unusual force.
Why Q4 wins and Q1 loses
The mechanism is prosaic and has nothing to do with the weather.
The fourth quarter is the strongest for two reasons that work together. The first is the close of the financial year — both on the developers’ side (who want to hit sales targets and results before the balance sheet) and on the side of clients and banks. The second is end-of-year promotions — developers push stock before closing the books, which further concentrates decisions in November and December.
The first quarter is the weakest for the mirror reason: the year has just closed, targets have been met or written off, promotions have expired, and clients — who made their decisions late in the previous year — are resting. January and February aren’t a dead season “because it’s winter”. They’re a dead season because all the decision-making energy was consumed a quarter earlier.
There’s one more pattern worth knowing, because it also defies intuition. Summer stalls, September rebounds — but not for the reason most assume. The common explanation goes: “they’re back from holidays, kids go to school, families settle down”. It’s a nice story, but the mechanism is different. The September rebound (around 3,664 units in 2025) is demand deferred from the summer — decisions that ripened over the summer but that no one closed, because half the market was on leave. It isn’t the return to school that drives September. It’s the return to the desk.
This difference isn’t academic. If you think September works “because of the school year”, you target families with children. If you understand it’s deferred demand, you know you’re working with clients who already made the decision over the summer and are now just waiting for someone to close it for them — which is a completely different sales conversation.
The implication most people miss
From this pattern follows something that is doubly counterintuitive.
Since the first quarter is the weakest for sales, it is at the same time the quarter in which a developer’s pain, budgets and planning pile up at once. Sales are stalled, so tension rises. Budgets for the new year are freshly opened. Plans for the next phases are being laid out right now. It’s the moment when the board most acutely feels that something isn’t working — and still has the full pot to fix it.
In other words: the weakest sales quarter is the best quarter for a decision about how to sell. Not because that’s when you sell, but because that’s when it’s clearest where the system fails to close — and there’s both the budget and the will to change it before the next launch.
And now the thing that ruins this neat picture: 2026
If this article ended on “Q1 weak, Q4 strong, plan around the calendar”, it would be neat and useless. Because seasonality is only true until something stronger is laid over it — and in 2026 something was.
The first quarter of 2026 was supposed to be, per the pattern, the weakest. Instead it brought record demand. Warsaw recorded sales about 30% higher year on year — a record. BIK reported a rise in mortgage enquiries that was officially compared to the anomaly before the collapse of Lehman Brothers in 2008.
Why? Because a factor stronger than the calendar kicked in: panic ahead of rising borrowing costs. Clients and advisers rushed to close purchases on the old terms before mortgage offers got more expensive. Seasonality didn’t disappear — it was covered by a macro shock that concentrated decisions against the time of year.
This is the most important takeaway of this text: seasonality is real and predictable, but it is a weaker force than macro. Whoever plans a launch solely around the calendar is shooting blind in both directions — missing the natural windows when the market is calm, and walking into anomalies when something stronger has just rearranged demand.
What to do about it
The practical conclusion isn’t “ignore seasonality” or “plan around seasonality”. It’s: treat the calendar as the default backdrop, not as a steering signal.
In a normal year, without strong macro disturbances, the pattern holds — and then it’s worth aiming the launch and sales intensity at the windows when the market naturally buys, and using Q1 to prepare and fix the system rather than to force sales against the current. But in a year when something big is happening — a rate shock, a mortgage panic, a change in a government programme — it’s those factors that take the wheel, and planning around the calendar becomes mistaking the map for the terrain.
A good launch plan doesn’t ask “which month is it”. It asks “what is driving or holding back demand on this specific market right now” — and the calendar is only one of the answers, and rarely the most important.
If you’re planning the start of a new phase’s sales and want to set it against real demand rather than the calendar — let’s start with a market diagnosis. I look at what drives buyers’ decisions now, on this market, not at what “usually works”.
Before you set the launch against demand, it’s worth knowing whether your funnel is ready for that demand. Check in two minutes: where your sales funnel is leaking.