In just a few years, the Kretz family has grown from a low-key agency founded in France in 2007 in Boulogne-Billancourt to a major player in the luxury real estate market, propelled by television exposure and a well-established family strategy.
For the Kretz family, real estate is as much about storytelling as it is about selling. Long before their media exposure, the family had already laid the foundations of a strong aesthetic and narrative universe. A signature that, over the years, has evolved into a true brand.
The family before the spotlight
It all began with Sandrine and Olivier Kretz, a couple with no background in real estate. She was a teacher who also took on interior design projects, while he worked as a sales director in a telecommunications company. Nothing seemed to predestine them to become figures in luxury real estate. In the late 2000s, while searching for their own home near Paris, in Boulogne-Billancourt, they decided to change direction and launched Kretz & Partners, with a rather bold intuition: to position themselves directly in the high-end segment, without going through intermediate markets. The company initially focused on castles before expanding its portfolio to include private mansions, exceptional apartments, and villas.
At the same time, Sandrine played a key role in international development. Being multilingual, she built a network of foreign clients, including expatriates, investors, and high-net-worth individuals. Kretz & Partners’ reputation was built discreetly, almost confidentially, within a circle where word of mouth carried more weight than visibility.
In the 2010s, a turning point came with the gradual arrival of their four sons – Martin, Valentin, Louis, and Raphaël – into the business. This integration deeply transformed the structure. Each brought different skills: business development, strategy, communication, and digital.
The agency grew in scale, but above all in identity and visibility. At a time when social media governs business promotion, its communication became more professional: polished visuals, staged properties, and careful attention to aesthetics. Without actively seeking the spotlight, it was already developing a distinctive visual and narrative signature, setting itself apart in a highly codified sector while highlighting the family’s rise.
The TV series that changed everything
Between 2014 and 2018, the company opened its doors to TV programs such as “50’ Inside” on TF1 and “Zone Interdite” on M6, giving it a boost in visibility.
In 2020, the Kretz family entered another dimension. Previously known within a limited circle of wealthy clients, their luxury real estate agency suddenly became visible to the general public with “The Parisian Agency: Exclusive Properties,” broadcast on TMC. Viewers discovered this discreet world of elites and the staggering prices of the most beautiful properties around the globe. The show follows the family’s daily life, between negotiations, spectacular visits, and private moments.
“At that time, besides the family members, we had 5 sales agents, compared to 90 today, including 75 in France… That shows how much the series was a huge business accelerator for us,” explained Valentin Kretz, associate director of Kretz Family Real Estate and the youngest of the siblings, to Immomatin in 2023.
Very quickly, the show found its audience. In France, it attracts nearly 700,000 to 800,000 viewers for its best seasons, and between 500,000 and 700,000 depending on the episode. The show is also available for streaming on Netflix. In 2026, the family is filming its seventh season.
On social media, the enthusiasm is just as visible. The Kretz Real Estate Instagram account has more than 521,000 followers. While the parents each have around 80,000 followers, their sons have built very strong communities. Valentin Kretz, for example, has 347,000 followers on the platform.
Increasingly ambitious projects
In 2025, Kretz Real Estate recorded 80% revenue growth, with over €500 million in properties sold during the year and 250 annual transactions.
According to Alexandre Bruneau, CEO of Kretz Real Estate, in an interview with Immomatin in 2025, the company pays “50% of revenue” to its “advisors [over 130 agents], with no tiers. 30% of listings are brought in by the agency and 70% by the agents.” The average sale price is €1.9 million.
The CEO also revealed the agency’s ambitions. “Regarding international expansion—beyond our wholly owned subsidiary in Spain led by Louis Kretz and his 17 real estate advisors—we will open our first licenses in Belgium and Switzerland, with entry fees and revenue-based royalties.” The brand also plans to expand to Mauritius. “As for France, we want to double our number of agents over the next 18 months to support our growth. […] If we reach, in the longer term, around 30% market share, compared to 10% today, we’ll be satisfied.”
@kretzrealestate Après l’annonce de l’ouverture de notre tout premier flagship, découvrez enfin le concept que l’on a construit avec @labelexperience Cet espace de 230 m² n’est pas qu’une simple agence physique, c’est un lieu de vie, d’échange et de partage. Chaque pièce s’inspire de l’un des membres de la famille Kretz, en reflétant ses voyages, ses goûts, ses souvenirs et expériences. C’est une immersion dans l’univers des Kretz. D’ailleurs, l’élégance Art déco, clin d’œil à la maison familiale de Boulogne, en est le fil rouge esthétique. Stay tuned : on vous dévoile très bientôt les prochaines pièces en détail. #kretzfamilyrealestate #lagence #luxuryrealestate #flagship ♬ son original – Kretz Real Estate
The family has recently launched the Kretz Club, an exclusive circle dedicated to high-end real estate investment, as well as a podcast hosted by Martin and Valentin. At the beginning of the year, the firm also opened its Paris flagship, located at 100 rue du bac (7th arrondissement of Paris), designed as a living space as much as a sales venue, positioning Kretz Real Estate as a lifestyle and experiential brand.
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Featured photo : DR
