Property owner in Brussels: what are your obligations in 2026?

Updated March 3, 2026 by Pierre

Owning property in Brussels is more than just collecting rent. The Brussels-Capital Region imposes a specific legal framework to guarantee the safety, hygiene, and quality of life of its residents. In 2026, certain obligations became mandatory—and it's best to be aware of them to avoid penalties or disputes.

Here are the key points to remember.

1. A compliant and healthy dwelling

Before putting the property up for rent, the owner must ensure that the property meets the minimum standards of safety, hygiene and habitability set out in the Brussels Housing Code.

This involves in particular:

• A stable structure
• A safe electrical installation
• A functional heating system
• Sufficient ventilation
• The absence of excessive humidity or dangerous mold
• A minimum living area

A dwelling deemed non-compliant can be declared unsanitary, with a ban on renting it out as a consequence.

2. Smoke detectors: mandatory since 2025

Since January 1, 2025, all dwellings in the Brussels Region must be equipped with smoke detectors compliant with European standard EN 14604.

They must:

• To be of the optical type
• To be placed on evacuation routes (corridors, landings)
• To be interconnected when there are four or more

The installation of the smoke detector is the responsibility of the landlord. Routine maintenance may be the responsibility of the tenant according to the terms of the lease.

This requirement aims to reduce domestic fires, which are still frequent in urban areas.

I am often asked what about the CO₂ meter It's not strictly mandatory, but highly recommended in certain cases. Indeed, the carbon dioxide detector is very useful, and can save your life, if the accommodation includes:

• A wood stove
• A chimney
• A gas boiler
• A gas water heater
• Any non-electric combustion appliance
• A very well-insulated dwelling with low natural ventilation

In these situations, indoor air quality can deteriorate rapidly. A CO₂ meter allows you to monitor CO₂ levels in real time and anticipate ventilation problems.

3. Mandatory PEB certificate

Every owner must have a certificate Valid PEB (Energy Performance Certificate).

This document:

• Must be communicated to the tenant
• Must be included in the advertisement
• This now influences the possibilities for rent indexation.

The least energy-efficient homes may be subject to restrictions.

4. Written lease and inventory of fixtures

In Brussels, the Written lease required in Brussels Brussels lease registration mandatory property condition report Brussels as well as 9-year lease Brussels rules These are among the essential obligations that every landlord must fulfill before renting out a property. The lease must:

• To be written
• Be registered (free for residential properties)
• Mention the contract duration

An entry inventory must be carried out jointly by both parties and attached to the lease. Without an inventory, the tenant is presumed to have received the property in good condition.

5. Repairs and peaceful enjoyment

Major repairs (roof, faulty boiler, structural leaks) are the responsibility of the landlord. Routine maintenance and minor repairs are the tenant's responsibility. The landlord must also guarantee the tenant's peaceful enjoyment of the property and cannot access it without permission, except in an emergency.

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In short

In Brussels, being a homeowner today involves a demanding legal framework: compliance of the accommodation, mandatory smoke detectors, valid PEB certificate and registered lease.

The CO₂ meter is not mandated by law, but in some homes — particularly those with combustion appliances — it represents a smart and reassuring preventative measure.

An informed owner is a protected owner.