154 residential burglaries were recorded in Watermael-Boitsfort in 2025. That is 47.1 % fewer than in 2019, one of the clearest declines in the Brussels Region. But from one year to the next, the curve has stopped dead: −1.3 % between 2024 and 2025. The municipality has reaped the easy gains; what remains is the hard core of the problem, and that core has a name — the empty house.
Six years of decline, then a plateau
The series of offences recorded by the federal police reads at a glance: 291 in 2019, 151 in 2020, 220 in 2021, 226 in 2022, 218 in 2023, 156 in 2024, 154 in 2025.
The year 2020 teaches us nothing: the lockdown filled the houses, and residential burglary is a crime that requires an absence. The proof lies in the immediate rebound of 2021 and 2022. The real drop lies elsewhere — between 2023 and 2024, when the municipality went from 218 to 156 incidents. That movement is structural, not cyclical.
That is exactly why 2025 deserves attention. The decline is now only 1.3 %. In other words, the fall has not reversed, but it has stopped. Over the long term, the two available reference points set the context: 300 incidents in 2000 — the peak of the series — and 240 in 2015. Watermael-Boitsfort has never been a Brussels hotspot, and it has durably reduced its exposure. It has simply reached the floor of what the overall trend can deliver.
One figure completes the picture: of the 180 burglaries in buildings recorded in the municipality in 2025, 86 % target homes. This is one of the highest shares found in Brussels. Watermael-Boitsfort offers practically no commercial or logistics targets: it is homes that are burgled there, at an average rate of three a week.
A risk of layout as much as of statistics
The municipality is made up of garden cities, suburban neighbourhoods and villas backing onto the Sonian Forest. This layout completely changes the geography of risk compared with a Brussels district of apartment buildings.
In a block of flats, the weak point is the flat's front door and the neighbours act as a permanent sensor. In Watermael-Boitsfort, the weak point is the back: living-room French window, bay window, conservatory, kitchen door opening onto the garden. These access points share three characteristics, and they are exactly the ones that decide a break-in: glazed and therefore quick to force, invisible from the street, and served by an enclosed garden that shields the intruder from view as soon as they are inside it.
Add to this a Boitsfort peculiarity: the forest edge and the green interiors of the blocks offer approach and escape routes that do not use the road. A camera trained on the front door will never see any of this.
What 'absence' really means
Limiting the risk periods to the summer holidays is the most common mistake. In a residential municipality where working people work elsewhere, the house is already empty every working day, and the question is not whether you are away, but whether your absence is visible from the street.
It almost always is, through trivial signals: a full letterbox, shutters stuck in the same position for several days, a bin left out, no varying lights in the evening, real-time travel posts. None of these clues is a problem on its own; together they turn an ordinary house into a selected house.
The countermeasure is not primarily technological. It consists of keeping the address alive: someone who collects the post, moves the shutters, brings in the bins. Technology comes next, for what nobody can do in your place — knowing immediately what is happening and checking it remotely.
That is the purpose of photo-verification detectors: a notification alone forces you to go home or disturb a neighbour; a notification with an image settles in three seconds whether it is a cat or an intrusion. For a long absence, a Wi-Fi camera on the rear access completes the set-up, provided the legal framing rules detailed below are respected.
No municipal security grant identified
Let us state it clearly, because the information circulates badly: no municipal burglary security grant could be identified in Watermael-Boitsfort, as the municipal page listing grants does not mention one. Several neighbouring Brussels municipalities offer one; that is not the case here, and it is better to know this before building a budget on non-existent support.
One point is worth adding, because it is true everywhere: these municipal grants, where they exist, fund mechanical protection — reinforced locks and cylinders, burglar-resistant glazing, sturdy doors and frames. Alarm systems and cameras are excluded. Nobody, in Watermael-Boitsfort or elsewhere, will have an alarm reimbursed by their municipality. The two approaches are complementary but distinct: mechanical protection delays, electronic protection signals.
What does exist, on the other hand, and is free, is the burglary prevention adviser of the Uccle / Watermael-Boitsfort / Auderghem police zone (5342). The adviser visits your home, examines your real access points and has nothing to sell. The municipality describes the procedure on its techno-prevention page. It is the rational starting point for any project, and it remains massively under-used.
Legal obligations once the equipment is installed
Two distinct regimes, often confused, and federal in both cases — nothing specific to the municipality.
Alarm: declaration within ten days via police-on-web, annual confirmation, outdoor siren limited to three minutes, annual maintenance and mandatory alarm verification before any police intervention. Legal basis: the Royal Decree of 25 April 2007. Details are in our guide on the declaration of an alarm system in Belgium.
Camera: declaration on declarationcamera.be, visible regulatory pictogram, register of processing activities, and a ban on filming the public road or the neighbour's property. In a garden-city neighbourhood where plots adjoin and hedges replace walls, this restriction very concretely determines the mounting height and angle. Our article on the camera law in Belgium sets out the applicable rules.
A set-up calibrated for a house that is often empty
The configuration that matches the Boitsfort risk is nothing spectacular, but it follows a precise order.
- A control panel able to manage the whole system and notify you in real time, with no compulsory subscription — see also our article on the Ajax alarm without a subscription.
- A garden-side outdoor detection system, which alerts you before the glass is broken and not once the intruder is in the living room.
- Photo-verification detectors in the rooms people pass through, which also meet the alarm verification requirement.
- A siren mounted outdoors: noise remains the main reason a burglar abandons a break-in in progress.
- For long absences, a flood detector: over three weeks with nobody at home, a leak often costs more than a burglary.
The equipment budget for such a set-up varies widely with the number of access points to be covered: a terraced house with a single rear French window and a detached villa bordering the forest do not call for the same budget.
Frequently asked questions
How many burglaries were there in Watermael-Boitsfort in 2025?
154 residential burglaries were recorded in Watermael-Boitsfort in 2025, an average of three per week. That is 1.3 % fewer than in 2024 (156 incidents) and 47.1 % fewer than in 2019 (291 incidents).
Is there a municipal security grant in Watermael-Boitsfort?
No municipal burglary security grant could be identified in Watermael-Boitsfort. Where such grants exist in other municipalities, they only fund mechanical protection (locks, cylinders, burglar-resistant glazing, frames) and exclude alarms and cameras. The burglary prevention adviser of police zone 5342, on the other hand, remains free.
Which access points are most exposed in a Boitsfort house?
The rear access points: living-room French window, bay window, conservatory and kitchen door opening onto the garden. They are glazed, invisible from the street, and the enclosed garden serving them protects the intruder once inside. In 2025, 86 % of burglaries in buildings in the municipality targeted a home.
Do you need to declare an alarm in Watermael-Boitsfort?
Yes, as everywhere in Belgium. The declaration must be made via police-on-web within ten days of installation and confirmed every year. This obligation stems from the Royal Decree of 25 April 2007: it is federal and does not depend on the municipality.
How can you monitor your house during the holidays?
By combining two things: making your absence invisible from the street (post collected, shutters moved, bins brought in) and being able to check remotely what triggers an alert. Photo-verification detectors or a camera on the rear access save you from having to go home or disturb a neighbour to verify an alarm.
Sources: Police crime statistics, Federal Police DGR/DRI/BIPOL, publication 2025_T04 (cut-off date 24/04/2026) — Watermael-Boitsfort municipal fact sheet. Absence of a municipal security grant checked on the municipality's pages. Municipal schemes change from one year to the next: check with your administration before incurring any costs.