About Us

About Us

At Only One Construction, we are your trusted partner in construction and remodeling projects across the United States, with a strong presence in California. We distinguish ourselves through our meticulous attention to detail, professionalism, and an unwavering commitment to excellence in every project.

Leadership with Experience

Our company is led by

Leandro Montejo, a Project Manager, Licensed General Contractor in California, and Architect with over 20 years of experience in architecture, construction, and project leadership across Colombia and the United States. Leandro is a bilingual project manager (native Spanish, professional working proficiency in English) recognized for his modern approach to design aesthetics, effective team leadership, and steadfast commitment to excellence.

His professional background includes key roles as Project Manager at extensive experience as a Project Manager in Colombia (2002-2020). Prior to that, he graduated with a Bachelor of Architecture 2002 , where he also served as a juror for undergraduate thesis presentations.

Our Experience and Capabilities

With vast experience, Only One Construction specializes in transforming spaces and building dreams. Our team’s main competencies, driven by Leandro’s expertise, include:

• Project planning, execution, and management: Developing comprehensive project plans to ensure success.
• Architectural and interior design: Creating functional designs that meet client needs.
• Construction supervision and safety compliance: Overseeing construction ensuring safety and quality standards.
• Budgeting and cost control: Managing project budgets effectively.
• Team leadership and subcontractor oversight: Leading and empowering team members.
• Client and stakeholder communication: Building strong client relationships to improve satisfaction.
• Permit and inspection coordination.
• AutoCAD proficiency: Using AutoCAD for precise architectural drawings.
• EPA-RRP certification.

Our Services

We offer a wide range of construction and remodeling services, adapting to the specific needs of each client. These include:

• Accessory Dwelling Units (ADUs)
• Backyard Remodeling
• Bathroom Remodeling
• Epoxy flooring installation
• General Remodeling
• Room Addition Service
• Steel and Metal Work
• Kitchen Remodeling

At Only One Construction, we pride ourselves on leading multidisciplinary teams, managing project budgets efficiently, and delivering high-quality design and construction results. We are committed to client satisfaction and excellence in every step of the way.