Construire un EMPIRE du bâtiment

Joseph Lasser is an entrepreneur who has built a construction powerhouse, Group Douer, from the ground up—not by swinging a hammer, but by mastering the art of the "BBB" or "Boomer Boring Business." Today, his group employs 150 people and generates €25 million in annual revenue. In this discussion, Lasser breaks down his transition from a fired consultant to a strategic acquirer, his philosophy on "collective pride," and the specific mechanics of scaling a fragmented, traditional industry through mergers and acquisitions. **The Spark: From Photovoltaics to Collective Pride** Lasser’s journey began in 2009, following a dismissal from a consulting firm. He partnered with a friend to launch a photovoltaic business during the subprime crisis. However, the regulatory landscape for solar energy was volatile, with subsidies and prices changing every three months. Amidst this uncertainty, Lasser discovered the roofing trade. He was struck by the "collective pride" of the roofers (compagnons). Unlike the corporate world of PowerPoints, these workers would stop their cars to point at a building and say, "I built that." This sense of utility and craftsmanship became the foundation of his entrepreneurial mission. When his original partnership dissolved in 2014, he took over the roofing branch and renamed it Douer, after Paul Doumer—the only French president who had been a construction worker. **The Acquisition Strategy: Buying "Boomer Boring Businesses"** Lasser’s growth has been fueled by a "buildup" strategy: acquiring small, stable companies from retiring owners. He targets businesses with specific characteristics to limit risk. First, he prefers "technical" founders over "commercial" ones. A technical founder leaves behind a team and a client base built on quality, whereas a commercial founder's departure often leads to a loss of business. Second, he looks for stable financial history—not necessarily high growth, but consistent margins. Lasser learned through failure that size matters. His first acquisition was a three-person woodworking shop, which he describes as a disaster. He realized that a company with only three people is too fragile; if one key person leaves or gets sick, the business collapses. Today, his "floor" for an acquisition is roughly 10 employees and €1 million in revenue. This size allows for a dedicated manager who doesn't have to be on the tools themselves. He typically values these companies at 3 to 5 times their operating result (Rex), plus the value of the cash on hand. **Operational Excellence and the "Diseconomies of Scale"** The construction industry is notoriously disorganized. Lasser’s value-add is bringing structure to these "boring" businesses. When he acquires a company, he immediately implements three changes: he updates the IT systems (using an ERP called Granit), installs a new director, and re-engages the commercial pipeline. He specifically recruits "organizers"—often former site managers from giant firms like Bouygues or Colas—and trains them to be the Managing Directors of his smaller subsidiaries. Interestingly, Lasser argues against making these subsidiaries too large. He believes in "diseconomies of scale" in construction. A 20-person team where everyone knows each other is often more efficient and motivated than a 50-person team where workers feel like numbers. His goal is to scale each subsidiary to a "sweet spot" of €5 million to €10 million in revenue and then stop, choosing instead to acquire a new specialty or expand geographically. **Reducing Friction Through Integration** One of the core problems in construction is the "interface" between different trades. If the plumber and the tiler don't communicate, the project stalls. By owning seven different trades—roofing, carpentry, waterproofing, electricity, HVAC, tiling, and metalwork—Douer reduces this friction. When different branches of the same group work on the same site, they solve problems faster because they share the same culture and leadership. This integration provides a competitive advantage for clients who want reliability and a single point of accountability. **The Evolution of a Leader** Lasser’s role has evolved significantly. He started as the guy selling roofing contracts and has become a "manager of managers." Recently, he took a major step by bringing in a partner and Director General, Tristan, who previously managed billion-euro P&Ls at Sodexo. This move was born out of a realization that he was reaching his limit as a solo founder. Scaling to 150 people brought more stress, more cash flow challenges, and higher stakes—such as a recent site fire that nearly turned tragic. By sharing 30% of the capital with a partner who has experience in large-scale operations, Lasser has transitioned to a role focused on vision, high-level M&A, and representing the brand. **Conclusion: A Vital Necessity** For Lasser, entrepreneurship is a "fight back" against professional unhappiness. Growing up in a family where depression was a recurring theme, he felt a vital necessity to be happy in his work. His success with Group Douer is proof that even in the most traditional, "boring" industries, there is room for modern management, strategic scaling, and deep human satisfaction. He continues to look for new acquisitions, remaining faithful to his core belief: that the best way to grow is to build a company that people are proud to work for.