RentalOne GmbH

RentalOne GmbH is a German PropTech company founded in March 2025 in Saarland by Moritz Marx (CEO), Marc Jungfleisch (COO), and Nico Wirsching (CTO). The company builds a connected platform for the real estate industry, combining software development, in-house property management, and succession solutions for property management firms. Its services cover WEG (homeowners' association) management, rental management, and SEV (individual ownership) management, primarily in Southwest Germany. RentalOne positions itself as a platform that addresses fragmentation and isolation in the real estate sector. Before writing any code, the founders conducted over 4,500 personal interviews with market participants to understand the industry's needs. The company operates through three business areas: developing software for landlords and property managers, managing properties in the region itself, and taking over management companies whose owners lack succession plans. The company emphasizes transparency, fixed contacts, and documented processes. Each property has a dedicated manager, and clients can access a portal to view decisions, receipts, and open tasks. RentalOne works with regional tradespeople for maintenance, repair, and renovation, with prices and services stored in the system and orders documented. Bookings, account movements, and billing items are generated continuously rather than annually, allowing clients to trace from amount to document. RentalOne is based in Saarland and serves Southwest Germany. It remains a private company. The company's approach combines technology with direct service delivery, aiming to modernize property management through a networked platform.

RentalOne GmbH was founded in March 2025 in Saarland, Germany, by Moritz Marx (CEO), Marc Jungfleisch (COO), and Nico Wirsching (CTO). The idea originated in summer 2024 during a discussion among the founders about real estate as an asset class. They recognized that while real estate is one of the most stable investments in Germany, it is also one of the most stressful to manage. With economic thinking from Moritz and Marc and technical implementation strength from Nico, they set out to simplify this daily reality. Before building anything, the founders conducted over 4,500 personal interviews with market participants to deeply understand the industry's challenges. They identified that the core problem was not just digitalization but isolation: property management companies, family offices, and service providers work on systems that do not communicate with each other, leading to inefficiency and fragmentation. Each market participant operates in isolation with their own tools and formats, without a shared data foundation. Based on these insights, RentalOne was established to build a connected platform for the entire real estate industry. The company operates through three business areas: developing software for landlords and property managers, managing properties in the region itself, and taking over management companies whose owners lack succession plans. This three-pronged approach allows RentalOne to address the industry's needs from multiple angles. The company is based in Saarland and serves Southwest Germany. It offers WEG (homeowners' association) management, rental management, and SEV (individual ownership) management. RentalOne emphasizes transparency, fixed contacts, and documented processes, with each property assigned a dedicated manager and a portal for clients to view decisions, receipts, and open tasks. The company works with regional tradespeople and ensures that all bookings, account movements, and billing items are continuously documented and traceable.

• 2025

  March 2025: RentalOne GmbH founded in Saarland by Moritz Marx, Marc Jungfleisch, and Nico Wirsching.

• 2024

  Summer 2024: Founders discuss real estate as an asset class and identify the need for a connected platform.

Connected platform for the real estate industry, combining software, in-house management, and succession solutions with a focus on transparency and fixed contacts.

• WEG-Verwaltung

  Management of homeowners' association property, including resolutions, maintenance, costs, and communication.

• Miet-Verwaltung

  Rental management for multi-family buildings, from letting to technical operations.

• SEV-Verwaltung

  Management of individual ownership apartments as capital investments, including tenants, payments, and documents.

• Property management software

  Software for landlords and property managers, forming part of the connected platform.

1. 1Hausverwaltung & Software in Südwestdeutschland | RentalOnerental-one.de
2. 2Über uns: Gründer, Mission & Geschichte | RentalOnerental-one.de
3. 3RentalOne GmbH - Wikidatawikidata.org