Online property valuation: what is your home really worth?

An online property valuation is often the first step for many Belgian homeowners when they start thinking about selling. In a few clicks, a price range appears on your screen. But how reliable is that automated calculation, and what should you do with it next? This article gives you a clear answer.

How does an online property valuation work?

Online valuation tools work on the basis of algorithms that process large volumes of sales data. They look at recent transactions in your municipality, the type of property, the surface area, and sometimes the EPC rating. In Belgium, data from the Cadastre and Statbel are among the sources used.

Most tools ask you to fill in a handful of details: the address, the type of property (terraced house, semi-detached, villa), the liveable floor area, and the year of construction. Based on that information, the system generates an estimated value range, typically expressed as a minimum and a maximum.

The main advantage is speed. You do not need to contact anyone, and within a minute you have a first impression. That makes online tools useful as a reference point, especially if you are still weighing up whether or not to sell.

What are the limitations of an automated valuation?

An algorithm cannot see your home. It does not know that your kitchen was recently fully renovated, that your garden is exceptionally large for the neighbourhood, or that one of your windows looks straight out onto a wall. Yet those factors have a real impact on the selling price.

Automated valuations can also be significantly off in municipalities or districts where few transactions take place. If hardly any properties have sold in your street over the past two years, the algorithm has too few reference points to produce an accurate estimate.

In 2025 and early 2026, property prices in Belgium rose slightly again, with averages in Flanders hovering around 330,000 euros for a standard home. But those averages mask significant local differences: a property in the centre of Ghent calls for a very different approach than a comparable property in a rural municipality in the Kempen. An online tool only partially accounts for that.

Online valuation versus a valuation by an estate agent

A recognised estate agent carries out a full comparative market analysis. He or she visits the property, notes the condition of the roof, the insulation, the layout, and the proximity to schools and public transport. The agent then compares your property with recent selling prices of comparable homes in the area - not just asking prices.

The difference compared to an online tool is substantial. On average, an automated online valuation deviates 10 to 20 per cent from the final selling price. That may sound modest, but on a property worth 300,000 euros it represents a margin of 30,000 to 60,000 euros. Overestimating leads to a property sitting on the market for too long. Underestimating costs you money.

Would you like to know what your property is truly worth in the current market? Through our free valuation service, IMV connects you with a recognised local estate agent who will come and assess your property in person.

When is an online valuation useful?

An online valuation is not a substitute for a professional appraisal, but it does have a valid place in your sales journey. It is useful in the following situations:

• Initial orientation: You are considering selling and want to know which price bracket you are in before contacting an estate agent.
• Basis for comparison: You have already received a valuation from an estate agent and want to compare it with what the market data suggests.
• Inheritance or divorce: You need a quick indication for administrative purposes, knowing that a notary or appraiser will carry out a formal valuation later.
• Preparation for a meeting: You want to go into a conversation with an estate agent well-informed and with a rough price in mind.

In all of these cases, an online tool gives you a starting point - not a finishing line.

From an online indication to an accurate asking price

The next step after an online valuation is a conversation with one or more recognised estate agents. They know the local market, have access to recent transaction prices that are not publicly available, and can advise you on how to position your property correctly.

It pays to compare several estate agents - not only on the estimated price, but also on their marketing approach, commission rate, and local experience. An agent who knows your neighbourhood well will find the right buyers more quickly.

Through IMV's comparison tool, you can request details from up to three IPI-recognised estate agents in your area, completely free of charge and with no obligation. You compare their proposals and decide for yourself who you want to work with.

What should you look out for with online valuation tools?

Not all online tools are equally transparent. Keep the following points in mind when using an online valuation:

• Data source: What data does the tool draw on? Tools that use Belgian Cadastral data are generally more reliable than tools that rely solely on advertised asking prices.
• Up-to-date information: Are the data updated regularly? The Belgian property market moves quickly, particularly in urban areas.
• Transparency about margins: A reliable tool provides a price range and explicitly states that the result is an indication only.
• No hidden obligations: Be cautious with tools that ask for your contact details without clearly stating what will be done with them.

IMV offers a free and transparent valuation service that connects you directly with a locally recognised estate agent, with no hidden agenda.

Frequently asked questions

Is an online valuation of my property reliable?

An online valuation gives you a useful indication, but on average it deviates 10 to 20 per cent from the actual market value. For an accurate selling price, you need a personal appraisal by a recognised estate agent.

How much does a professional property valuation cost?

Many recognised estate agents offer a free valuation as part of a potential sales mandate. Through IMV, you can request quotes from several agents in your area without obligation and without having to commit to a mandate.

How does an online valuation differ from a notarial valuation?

A notarial valuation is a formal, legally grounded appraisal, often used in the context of inheritances, divorces, or mortgages. An online valuation is an automated indication with no legal standing. To sell your property, you do not need a notarial valuation - but you do need a realistic market price, which you determine together with an estate agent.

When is the right time to have my property valued?

You can have a valuation carried out at any time, even if you are still undecided about selling. A conversation with an estate agent is entirely without obligation and gives you concrete information to base your decision on. The sooner you inform yourself, the better you can plan.

An online valuation is a handy starting point, but the true value of your property is determined together with a professional who knows your neighbourhood and your home. Ready to move from an indication to a concrete sales strategy? Compare estate agents for free via IMV and take the next step with confidence.