How to Sell a House in Watermael-Boitsfort or Auderghem in 2026: Prices, Buyers and Strategy

Are you thinking of selling your house in Watermael-Boitsfort or Auderghem? These two communes in south-east Brussels share the Sonian Forest, a village feel and a loyal family clientele. Yet how you sell a house in Watermael-Boitsfort is not quite the same as a sale in Auderghem: the housing stock, the heritage rules and the price levels all differ.

Here are the 2026 figures, the points to watch and the strategy that works today in these two neighbouring markets.

Two neighbouring markets, two profiles

Watermael-Boitsfort is the green commune par excellence: villas on the edge of the forest, village houses around Place Keym and Coin du Balai, and the famous garden cities of Le Logis and Floréal. The housing stock is dominated by single-family houses with gardens.

Auderghem is more varied. It has terraced Brussels houses around Boulevard du Souverain, residential areas near Rouge-Cloître and Val Duchesse, and more apartments. The commune benefits from the metro (line 5) and direct access to the E411 motorway, a strong selling point for people working in the centre or on the outskirts.

These differences show in the figures. According to Statbel, in the first half of 2026 the median house price was €630,000 in Watermael-Boitsfort (60 sales) against €549,000 in Auderghem (59 sales). For apartments the order is reversed: €300,000 in Watermael-Boitsfort and €315,000 in Auderghem (Statbel, via Immolytics).

First half of 2026 (Statbel)	Watermael-Boitsfort	Auderghem
House, median price	€630,000 (60 sales)	€549,000 (59 sales)
Terraced or semi-detached house	€607,500	€549,500
Apartment, median price	€300,000 (74 sales)	€315,000 (146 sales)

With around sixty house sales per half-year, these medians move quickly from one period to the next. In Watermael-Boitsfort the median house price fell 2.7% compared with the first half of 2025, while the Region as a whole rose. This mainly reflects which properties sold during the period, not a general drop in value.

A Brussels market that remains buoyant

The regional context favours house sellers. For Brussels in the first half of 2026, Statbel reports a median price of €550,000 for terraced or semi-detached houses (+10% year on year) and €1.23 million for detached houses (+26.2%) (BX1, 22 September 2026).

The notaries’ figures confirm the trend: over the first nine months of 2026, a house in Brussels sold for an average of €609,227, 4.8% more than in 2025, with an almost stable number of transactions (notaire.be, 13 October 2026). The typical house buyer is 41 years old on average: exactly the family profile searching in Watermael-Boitsfort and Auderghem.

Garden cities: assets and heritage constraints

Le Logis and Floréal are a unique image asset: cobbled streets, houses with coloured shutters, gardens and a strong community spirit. But they have been listed as an ensemble since 15 February 2001, and a heritage management plan covers more than 1,000 houses built between 1921 and 1937 (patrimoine.brussels).

In practice, the plan covers facades, window frames and doors, roofs, garages, fences and garden sheds. Works that follow the plan’s solutions are exempt from planning permission. External facade insulation, however, requires an energy audit subject to the Region’s approval, and any solution that departs from the plan needs a standard planning permit.

For a seller, this has three consequences:

• Buyers do their homework: a clear file (original window frames or replacements with authorisation, works carried out, grants received) reassures them and avoids downward negotiation.
• Urban planning information and the compliance of alterations are closely scrutinised, especially for a conservatory or a dormer window.
• The energy renovation potential must be explained: what is allowed, what requires an audit, what is subsidised.

Outside the garden cities, parts of Watermael-Boitsfort and Auderghem border the Sonian Forest, some of whose reserves have been on the UNESCO World Heritage List since 2017 (RTBF). Being right next to the forest is a strong selling point, but extensions there are also more tightly regulated.

Who buys: families, expats and EU officials

The core of demand comes from families leaving an apartment in Ixelles, Etterbeek or Saint-Gilles for a garden and good schools. These communes also feature in our selection of family-friendly neighbourhoods in Brussels.

International buyers matter too. The International School of Brussels is located in Watermael-Boitsfort and has around 1,300 pupils from 65 countries (Wikipedia). Auderghem, for its part, attracts EU officials and executives thanks to the metro to the European Quarter and the motorway.

These buyers have precise expectations: an EPC certificate, a floor plan in square metres, the garden’s orientation and information available in English. A well-presented garden remains decisive, as we explained in our article on outdoor spaces, Brussels’ new green gold.

How to sell a house in Watermael-Boitsfort: pricing strategy in 2026

In a market with around sixty house sales per half-year per commune, every property is almost unique. The median gives an order of magnitude, not a price. To sell a house in Watermael-Boitsfort or Auderghem at the right price, four rules apply:

1. Start from actual sales in the neighbourhood, not asking prices. A villa in Coin du Balai, a house in Floréal and a terraced house near the Souverain cannot be compared.
2. Put a value on the assets: garden, garage, proximity to the forest, the international school or the metro within walking distance. These are what justify the gap with the median.
3. Deal with the EPC and planning issues early. A poor EPC rating or a breach discovered mid-sale is paid for at the negotiation stage.
4. Set a credible asking price from the start. Buyers follow this market closely and quickly spot an overpriced property, which ends up selling for less after several price cuts.

For high-end properties, especially detached villas on the edge of the forest, discretion can be an asset: targeted marketing to qualified buyers, before or instead of a public listing. The approach is the same as in Uccle, which we cover in our guide how to sell a house in Uccle in 2026.

Frequently asked questions

Conclusion: get your house valued before you start

Watermael-Boitsfort and Auderghem remain two of the most sought-after markets in south-east Brussels. Prices are holding up and family and international demand is solid, but buyers are demanding and well informed.

Would you like to sell your house in Watermael-Boitsfort or Auderghem? I offer a well-argued valuation based on recent sales in your neighbourhood and on your property’s own strengths. Find out how I can help you sell.