The DDN is a company that provides engineering services in the field of Construction.

DDN is certified in ISO 9001 Quality, qualified by the LNEC as General Manager of quality and accepted in the Qualification System of Supervision of Aguas de Portugal, EDP and ANA Aeroportos de Portugal.

DDN develops Integrated Management services, Project Supervision with Tender Process, Supervision, Coordination of Hygiene, Safety, Health, Environment and Noise, Contract Management, Project Licensing and review of Implementation, as well as strategic advice on the analysis of real estate, all in accordance with the recommendations of IPMA – International Project Management Association.

DDN 20 Years photo (December 2014)

DDN bets at the forefront of its services in order to monitor and ensure its customers projects with high levels of Profitability.

Initially devoted to the direct management of Contracts, DDN has over 20 years of experience combined with Motivated and Prepared Employees for the Quality and Rigorous development of the Projects we take on.

With competence, DDN is customer focused and prepared to provide solutions that contribute to the Success of the projects.


DDN aims to be recognized as the company that provides high returns and solutions for its customers’ investments.


Provide solutions and shape the projects of our customers, giving them modernity, adding technical, economic and social value.


DDN governs its activities by the following values:

  • Professionalism and responsibility;
  • Loyalty and transparency
  • Creativity and proactiveness;
  • Mutual cooperation;
  • Social advancement;
  • Professional ethics;
  • Social responsibility.

Thus creating conditions to be motivated and ready to frame the Quality and Rigorous development of the Projects we take on.
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