Auderghem does not run a single Sunday market — it runs four, rotating through the month across different corners of the district. All of them open at 07:00 and close at 13:00, which makes this a genuinely early-riser circuit. Set in the southeast of Brussels, these brocantes feel rooted in the neighbourhood rather than staged for tourists. The viaduct setting at Herrmann-Debroux gives the whole thing an unmistakably local character.

The anchor of the circuit is the Grande Brocante beneath the Herrmann-Debroux viaduct. It runs on both the 1st and 4th Sundays of the month, making it the most frequent stop in the rotation. Reportedly over a hundred stalls spread through the space, and the stock leans toward the decorative and the antique: ornate mirrors, Victorian-era trinkets, ceramics, and the kind of accumulated domestic history that serious collectors move quickly through. The scale makes it the most browsable of the four, and the concrete viaduct framing overhead gives it an atmosphere no purpose-built market hall can replicate.

The 3rd Sunday of the month brings the Carrefour parking lot market — the most intimate of the four. Vendors here tend toward curated stock: vintage jewellery, decorative objects, second-hand books in good condition. The setting is quieter and more navigable, and the selection often rewards slower browsing rather than quick sweeps. If the Herrmann-Debroux market is where you cover ground fast, this is where you linger.

On the 2nd Sunday, the circuit moves to Boulevard du Souverain. The atmosphere here sits between the two extremes — broader in scope than the Carrefour market, but less sprawling than the viaduct gathering. Expect a mix of antiques, handmade items and general second-hand goods. Sellers at these Auderghem markets tend to know their stock well and usually welcome questions about provenance or history. That conversational quality is one of the things that distinguishes a local brocante from a generic car-boot sale.

Place Pinoy appears in accounts of the district's market culture as an additional gathering point, though it operates at a smaller scale than the four main rotation stops. It contributes to the sense that Auderghem treats Sunday morning as genuinely market territory across the whole district, not just around a single fixed location.

The rotating format suits dedicated collectors who can plan visits around specific Sundays, as well as Brussels visitors who want an authentic local morning. Repeat visits pay off — different Sundays bring different sellers and different stock, so the same circuit rarely delivers the same experience twice.

Getting to the Herrmann-Debroux market by public transport is straightforward. Metro line 5 stops at Herrmann-Debroux station, approximately 200 metres from the viaduct site — the obvious choice for anyone arriving from central Brussels. The same interchange is served by bus lines 41, 72 and N09, approximately 150 metres away. Tram line 8 stops approximately 250 metres from the market and connects from other parts of the city. Given the 07:00 opening, checking early-service schedules in advance is sensible before the first visit.