Co-ownership in Brussels: the regional obligations on top of the law

You have just been appointed syndic of a building in Schaerbeek, or you sit on the council of a co-ownership in Ixelles, and you want to know what else Brussels requires. A letter from Brussels Environment, a sale held up by a missing certificate, a boiler room whose certificates nobody can find: that is nearly always how the question arrives. This page sets out the rules for co-ownership in Brussels.

Let us say it straight away, because it saves you time: nothing that Brussels adds touches how the co-ownership works. Majorities, deadlines, accounts and the syndic's mandate remain those of the Civil Code, everywhere in Belgium. What is specific to Brussels concerns the building, and one deadline weighs more than all the others: 2033.

The law is the same, the rest is not

The system of compulsory co-ownershipGlossaryForm of co-ownership in which property must remain undivided because of its function or purpose, such as the common parts of an apartment building. Such property can only be divided with the agreement of all co-owners. See the glossary is set out in the Civil Code, Book 3, Articles 3.78 to 3.100, and the Civil Code is a federal law. A building with eight units in Jette and a building with two hundred units in Woluwe fall under the same text as their counterparts in Ghent. The hierarchy between the law, the by-laws and the house rules (ROI) is described in the section on the legal framework of co-ownership.

So what shapes your obligations is not the address but the number of units. Below twenty units, cellars, garages and parking spaces excluded, the owners' association (VME/ACP) may keep simplified accounts (Art. 3.89, § 5). From twenty units, counted in the same way, a co-ownership council becomes compulsory (Art. 3.90). Two Brussels buildings of different sizes do not have the same constraints; a Brussels building and a Flemish building of the same size do.

Three matters are regional and they all come in through the building: energy performance, planning, and money for renovation. The rest of this page deals with the first, because it is the one that currently creates new obligations at the level of the whole building.

Who orders the EPB certificate, and what must the syndic provide?

The certificate is the business of the unit owner, not of the association. It is compulsory for any individual dwelling of 18 m² or more put up for sale or rent, must be drawn up before the property goes on the market by a certifier approved by Brussels Environment, and is valid for ten years. The tenant receives it at the latest when the lease is signed. Prices are not regulated: in October 2026 the regional website gave an order of magnitude starting at 210 euros including VAT for a 90 m² apartment (Brussels Environment, the EPB certificate for a dwelling). Brussels Environment publishes all of these rules in Dutch as well.

Selling without a certificate is not an oversight without consequences. The administration checks advertisements and deeds, the notary informs it when a property is sold without a certificate, and if the public prosecutor does not prosecute, an administrative fine of 50 to 62,500 euros may be imposed.

The syndic's role lies elsewhere, and it is underestimated. The certifier needs documents that the seller does not have: plans, invoices for works on the common parts, inspection reports, the specifications of the boiler room. A technical file put together once and kept at the association's registered office saves the syndic the same search at every sale, and speeds up the sales themselves. The documents the seller must gather on top of this are listed in documents required for a sale.

The Region has announced that the obligation will be extended to all dwellings, including those occupied by their owner or left empty, by around 2030, with the date still to be set. In other words: the record of certificates in your building is not wasted work, it is work done in advance.

The 275 and 150 targets also bind the association

This is the heaviest Brussels point, and it has gone by fairly quietly.

Each dwelling will have to reach the EPB 275 target, meaning primary energy use of no more than 275 kWh/m² per year, by 1 January 2033 at the latest. A second threshold, 150 kWh/m² per year, is announced for 31 December 2045 at the earliest. So far, nothing that concerns the association. What follows does.

From the 2033 deadline, the owners' association becomes jointly responsible for each unit in the building meeting the target. It must appoint a single EPB expert for the building, who draws up the certificates of the various units and a summary report identifying the works to be carried out on the common parts. If a unit misses its target, the association may be penalised, unless it shows that it did everything in its power, or that no works on the common parts had been identified (Brussels Environment, EPB in a co-ownership).

One detail matters for your timetable: this new expert approval is not yet operational, as its entry into force depends on training and software that still have to be put in place. A co-ownership therefore cannot, today, appoint an expert for this summary report.

Our reading is clear. Waiting for the report before starting would be the most expensive mistake of the decade for a poorly rated Brussels building. The works that shift the energy use of every dwelling, insulating the facade and the roof, replacing the boiler room, shared ventilation, are voted by a two-thirds majorityGlossaryMajority required in particular for works affecting the common parts, other than works required by law and protective works, and for amendments to the articles that concern only the enjoyment, use or management of the common parts. See the glossary of the votes (Art. 3.88, § 1, 1°, b), Civil Code), are split according to the shares (quotités)GlossaryFraction of the common parts attached to each unit, set in the deed of division according to the respective value of the private parts. Shares determine the number of votes at the general meeting and can only be changed with the unanimous agreement of all co-owners. See the glossary, and require two to three financial years of preparation. The order in which to build this file is described in energy renovation and grants, and how to count the votes in voting rules and majorities.

What must your boiler room already comply with?

Several Brussels obligations are already in force, and they concern typically common elements.

Collective heating means that each unit must have its own heat meter or heat cost allocators. A collective chimney requires a list of the appliances connected to it, and an inspection with cleaning where needed every five years; old type B1 or B11BS boilers connected to it require a feasibility study for their replacement. Accessible pipes carrying water above 35 °C had to be insulated by 31 December 2025 at the latest, according to criteria of diameter and location. And installing an oil-fired boiler has been prohibited since 1 June 2025, unless an exemption applies.

On top of this comes the periodic inspection of the boiler room itself. It covers boilers with a rated input of at least 100 kW, gas or oil, that heat with water: at least once a year for oil, at least every two years for gas, by an approved EPB boiler technician. The certificates are kept for five years in the logbook, which stays on site, on paper or electronic, and must be available for inspection. In the event of non-compliance, the co-ownership has five months to carry out the works and have a new inspection done (Brussels Environment, new or existing boilers). An additional diagnosis, entrusted to a type 2 EPB heating adviser, had to be carried out before 1 January 2024 and is then repeated every five years.

Metering per dwelling is not just a technical formality: it changes the allocation key for heating, and therefore everyone's service charge statement. This switch needs preparing, because changing an allocation key requires a four-fifths majority. How it works is explained in splitting water and heating costs.

Planning, language and public support

Planning remains the area where the syndic cannot answer in place of the administration. Replacing the facade windows, installing solar panels, insulating from the outside: any permit falls under the Brussels Spatial Planning Code (CoBAT / BWRO), the permit is issued by the municipality, and it is the EPB officer of the municipal planning department who follows the energy side of works that need a permit. Consult the municipality before getting quotes, not after the vote.

As for guidance, the Region funds free advice that few volunteer syndics use: Homegrade gives Brussels residents tailored advice on energy, housing, renovation and planning, in Dutch as well, and the Réseau Habitat deploys housing advisers in several municipalities. These services do not manage your building, but they do much of the groundwork on a file before it reaches the general meeting.

That leaves the money. Brussels renovation support is grouped under the name Renolution, and the amounts and conditions change from one scheme to the next. One point does not change: for an association to apply, it must be registered with the Crossroads Bank for EnterprisesGlossaryFederal register of entities registered in Belgium, managed by the FPS Economy. The owners' association has a company number in it, which must appear on all its documents, and the syndic must be registered in it. See the glossary, and quotes and invoices must bear its name. Check the current state of renovation grants for co-ownerships when you plan the works.

Where to start if you take over a Brussels building

In this order, and it fits into one general meeting: the record of EPB certificates unit by unit, the technical file of the building, the boiler room logbook, then costing the common items that drag up everyone's energy use. Financing comes next, and it starts with the reserve fund, not with a grant you hope for.

If part of your property is in Flanders, the deadlines and schemes there are not the same: the Flemish rules for co-ownership in Flanders are set out in the topic pages. For everything that does not depend on the address, which is most of a syndic's work, go back to the section on co-ownership in Belgium.