Most owners sell a property once or twice in a lifetime. Choosing the agency that handles that sale is not a minor detail — it shapes the final price, the time on market, and how stressful the whole process feels. Yet many sellers sign a mandate after a single meeting, swayed by a flattering valuation or eager to get moving. Here’s how to properly evaluate a real estate agent in Brussels before committing your property.
Check the IPI/BIV accreditation — the non-negotiable baseline
In Belgium, every professional real estate agent must be accredited by the IPI (Institut Professionnel des Agents Immobiliers / BIV). This accreditation guarantees certified training, valid professional liability insurance, and adherence to a code of ethics. The IPI number identifies the individual, not just the agency brand — even within a large network, the specific agent handling your file must be personally accredited. Ask for this number at the first meeting and verify it on ipi.be. A serious professional won’t be bothered by the question; in fact, one who invites you to check it yourself is usually a good sign.
Open, semi-exclusive, or exclusive mandate: what’s the difference?
An open mandate lets you list with several agencies at once (or sell privately in parallel), but it often dilutes each agency’s commitment. A semi-exclusive mandate limits you to one agency while keeping your right to sell privately without paying a commission. An exclusive mandate commits a single agency to the entire marketing effort, usually in exchange for a stronger investment — professional photography, virtual tours, wider promotion.
Belgian law regulates the exclusive mandate specifically: it cannot exceed six months. If a longer term is written into the contract, it is legally capped at six months regardless. After that initial period, you retain the right to terminate the contract unilaterally, without needing to justify a reason, subject to notice. No serious agent should be locking you into a twelve- or eighteen-month exclusive mandate — if one is offered, treat it as a red flag worth questioning.
Questions to ask before signing
Before signing anything, ask these concrete questions:
- How many comparable properties have you sold in my neighborhood in the past twelve months, and at what price relative to the initial valuation?
- What’s the average time on market for similar properties?
- Who actually conducts the viewings — you personally, or a team member?
- Which channels will the listing run on (portals, social media, an existing pool of qualified buyers)?
- How often will I receive feedback on viewings and buyer interest?
- Is the commission quoted excluding or including VAT, and when exactly is it due?
Vague or evasive answers to these questions usually reveal more than the initial sales pitch.
How to judge a reliable valuation
This is the most sensitive point. Some agencies deliberately inflate the valuation to win the mandate, only to push for a price cut weeks later, once the listing has gone stale on the portals. A serious valuation is built on recent comparables that actually sold (not just listed), the property’s condition, size and orientation, and the specific dynamics of your commune. Be wary of a valuation noticeably higher than what two or three other agencies propose, without a clear justification. Always ask for the methodology used and, where possible, the real sale prices of comparable properties recently sold in the neighborhood.
Warning signs to watch for
A few signals should raise caution: pressure to sign the same day, a long exclusive mandate with no clear exit clause, a commission that’s never spelled out in writing, or no commitment at all to regular reporting. Conversely, an agent who takes time to explain their strategy, agrees to put terms in writing, and stays reachable after signing tends to inspire far more confidence over the length of a sale.
A concrete example
A seller in Ixelles compares two agencies for a two-bedroom apartment:
- Agency A proposes a valuation of €495,000, with no comparables shown, and a twelve-month exclusive mandate (beyond the legal maximum).
- Agency B proposes €465,000, backed by three recent comparable sales on the same street, a six-month exclusive mandate with an exit clause after three months, and weekly written reporting.
Six months in, Agency A would likely have had to revise the price downward after several weeks with no serious offers. Agency B, with a realistic price from day one, has a much better shot at selling faster, at the listed price.
In Summary
Always check the IPI/BIV accreditation and the agent’s individual number. Understand the difference between open, semi-exclusive and exclusive mandates, and remember that Belgian law caps the exclusive mandate at six months. Ask precise questions about comparable sales, reporting, and commission. And above all, be wary of a valuation that sounds too good to be true — a realistic price from the start remains the best ally for a fast, low-stress sale.
Weighing a few agencies, or want a valuation grounded in real Brussels market comparables? Contact GR-Properties (info@gr-properties.be) for a complete valuation.