Mouse Invasion Tests Brussels Grand-Place Traders

A mouse scurrying across the display window of a chocolate shop on Brussels’ Grand-Place, filmed during the night of 2-3 September, has become an unlikely emblem of a chronic problem in the Belgian capital’s most famous square. The video, which surpassed 200,000 views on TikTok, has reignited a long-simmering debate over rodents in the city centre, and exposed the limits of what individual shopkeepers can do about it.

The footage, reported by Bruxelles Today and relayed by Sudinfo, shows the animal inside the window of a chocolatier on the UNESCO World Heritage square. The shop’s manager offered a resigned assessment: “All traders have the same problem.”

Anyone who says there are no mice is lying

Behind the postcard image of gilded guild houses and waffle stands, merchants describe a daily reality of traps, repellents and pest-control bills. Cafes, chocolate shops, friteries and souvenir stores are all affected, they say.

Evram, owner of the brasserie Le Cerf on the Grand-Place, did not mince words. “Anyone who says there are no mice in the city centre is lying. Everyone has them. Spend the night and see for yourself,” he told RTBF. He estimated that his fight against rodents costs him 3,200 euros a year in repellent products, traps and professional pest control.

A few doors away, chocolatier Alex, dipping strawberries in melted chocolate, confirmed he regularly encounters mice and cockroaches. “These are old buildings, so it can happen,” he said. “Chocolate, sugar, grease, I do not see why mice would not like them.”

The structural explanation is not in dispute. The Grand-Place’s centuries-old buildings, cellars and food-centric commerce create ideal conditions for rodents, while food waste left on streets and picnicking in public spaces provide a steady supply of sustenance.

City points to collective responsibility

Didier Wauters, the City of Brussels alderman for commerce, acknowledged the problem. “When there is food, there are often mice,” he told RTBF. But he argued the solution cannot rest on individual shopkeepers alone: “If your neighbour to the right, left, or opposite does not eradicate the mice on their side, it is a bit of a lost cause.”

Wauters’ framing, that the problem requires a coordinated, neighbourhood-wide response, is central to how the city has positioned the issue. The municipality says it intervenes daily against rodents and has escalated its efforts. According to figures relayed by Bruxelles Today, 25 smart traps have been installed, 1,073 rats have been captured since the start of 2026, and the pest-control budget has risen from 35,000 to 100,000 euros per year.

The problem extends well beyond the Grand-Place. Rodent sightings are a recurring issue across central Brussels, and officials have described the city centre, the Pentagon area that includes the Martelaarsplein, as the region’s second-largest problem zone, after Laeken. The regional rat population has been estimated at around 2.5 million, according to VRT NWS.

That estimate, attributed to the office of Brussels alderman for public cleanliness Anas Ben Abdelmoumen, underscores the scale of a challenge that predates the viral video. In April 2025, Bruxelles Today reported that the city had carried out 260 deratisation actions between January and mid-March of that year, with Laeken accounting for nearly half. The Pentagon and Neder-Over-Hembeek logged 50 and 40 actions respectively.

A structural fight with limited tools

The city’s approach has evolved. Officials use slow-acting poison so that rats do not immediately detect tainted food, a tactic born of the animals’ cautious foraging behaviour. They also work with fast-food chains and restaurants to encourage food-waste separation, and have floated more novel measures, including experimenting with ferrets as natural rat-catchers from 2026.

Yet officials concede that prevention, keeping waste and food scraps off the streets, remains the most effective long-term remedy, and one that depends on collective discipline rather than municipal intervention alone. Proposed underground waste containers, which would remove refuse from the open air, hinge on regional cooperation.

For traders on the Grand-Place, the calculus is stark. Individually, they can trap and poison; collectively, they can only hope their neighbours do the same. The viral mouse in the chocolate-shop window may have been a passing social-media moment, but it captured a structural problem that Brussels has yet to solve: in a square built on food and history, the rodents have found an environment that suits them perfectly.

What to watch

Whether the city’s proposed ferret pilot materialises, and whether a coordinated, block-by-block strategy can succeed where individual effort has not, will determine if the Grand-Place’s image and its merchants’ bottom lines can be reconciled with the reality behind the display windows.