Every autumn brings back the same intuition: « public procurement picks up again in September ». That is true, but the intuition stops exactly where the decisions begin. We measured 127,531 Belgian public procurement notices published between 2021 and 2025 to answer three concrete questions: how much does the volume actually rise, which sectors are coming out now, and how much time is left once the notice appears.
1. The real rhythm of the year
August is the quietest month of the year: 6.4 % of all notices, against 8.3 % for an average month. September climbs back to 9.1 %, that is 43 % more notices than August. But the real summit is not there: it is October, at 10.8 % — the densest month of the calendar year, ahead of June.
| Month | Notices published | Share of the year |
|---|---|---|
| June | 13 642 | 10,7 % |
| July | 10 862 | 8,5 % |
| August | 8 162 | 6,4 % |
| September | 11 633 | 9,1 % |
| October | 13 735 | 10,8 % |
| November | 9 137 | 7,2 % |
| December | 8 014 | 6,3 % |
Source: 127,531 Belgian public procurement notices published between 2021 and 2025 (complete calendar years). A contract is counted at the first dispatch date of its publication notice.
That shape has a direct consequence for your calendar. September's rebound is not the event: it is the warning signal before the event. A bidder who starts getting organised when September's notices arrive has already lost the month that counts.
2. Which sectors come out in September
Not every sector follows the average. The table below shows, for each sector, the share of its yearly notices published in September — to be compared with the Belgian average of 9.1 %.
| Sector | Share published in September | Peak month |
|---|---|---|
| Financial services and insurance | 13,1 % | July |
| Energy, fuels, electricity | 10,2 % | October |
| Waste, sanitation, environment | 10,1 % | October |
| Construction works | 9,8 % | October |
| Transport equipment, vehicles | 9,8 % | June |
The case of insurance and financial services is the sharpest of all: 13.1 % of their notices appear in September, a concentration seen nowhere else. The reason is mechanical — these contracts start on 1 January, so the procedure must be closed before the holidays. The same logic applies to energy and fuels, whose contracts follow the calendar year. Construction works, on the other hand, weigh mostly through sheer volume: 4,531 notices published in September over five years, more than every other sector in this table combined.
3. What you prepare now for October
Seven of the eight sectors we measured publish more in October than in September. If your trade is on that list, the preparation work happens in September, not in October:
- Construction works — 11.6 % of yearly notices in October, against 9.8 % in September. It is also by far the largest sector of all.
- Architecture, engineering, inspection — 10.5 % in October. Study assignments precede the building sites: what is ordered now will be built next year.
- IT and digital services — 10.4 % in October, against 8.6 % in September. The second half of the year concentrates budget spending.
- Energy and fuels — 11.7 % in October, the strongest monthly concentration in our sample.
4. Thirty-four days: the time you have left
34 days
Median delay between the publication of a September notice and the deadline for submitting tenders, measured on 11,448 Belgian contracts. Half of them leave between 29 and 40 days.
Thirty-four days sounds comfortable. It is not. Most of those thirty-four days go into producing the tender itself: technical note, bill of quantities, pricing, planning, site visit. Everything administrative must already be in order by the time the notice appears — a social security certificate does not arrive in three days, and an accreditation takes far longer.
That is where autumn is really decided: not by answering faster, but by having nothing left to catch up on when the notice drops. An administrative file ready in September means thirty-four days entirely available for the part that makes you win.
5. Your autumn checklist
Six items, each justified by the figures above. To be dealt with before the end of September, not during October:
- 1. Check that your certificates are still valid — social security, tax, non-bankruptcy. They have a limited validity and are requested beforehand, not during.
- 2. Review your accreditations and their classes. An insufficient class sets aside an otherwise excellent tender, and raising a class takes months.
- 3. Update your references with the sites or assignments completed this summer. That is the raw material of your technical capacity, and precisely what people forget to do.
- 4. Prepare your reusable ESPD on e-Procurement. Filling it in calmly takes an hour; filling it in the night before a submission costs three.
- 5. Set your monitoring criteria now — CPV codes, geographical area, value thresholds. Monitoring configured in October arrives after the wave.
- 6. Decide in advance what you will not do. October's peak produces more opportunities than you can handle; choosing your battles upfront beats spreading yourself across three rushed tenders.
What these figures do not show
Everything above concerns published contracts. Yet a significant share of Belgian public spending never reaches the mandatory publication thresholds: those contracts are handled by directly consulting a few companies, without any public notice. They follow the same seasonality, but you will not see them on any official platform. That is exactly what our monitoring is for: contracts without mandatory publication.