Leslie O’Donnell  B.Eng. (Hons)  MCIAT

Is a Chartered Architectural Technologist and Structural Engineer with over thirty years experience in designing and supervising the construction of buildings. He writes regularly for the construction press in the UK and Ireland. Landmark Designs operates from rural County Tyrone in Northern Ireland and provides design, consultancy and advice for a wide range of construction works. Building projects are mostly in the UK or Ireland (some have also been completed overseas) and have included:

  • zero-carbon dwellings
  • traditional farmhouses
  • energy-efficient townhouses
  • eco-farm developments
  • listed building conservation
  • permaculture education centre
  • sustainable homes
  • micro-dwellings
  • churches and other public buildings
  • shops and other commercial premises
  • engineering workshops
  • industrial buldings
Family home in the Ulster countryside.

Design Objectives 


The aim of the design service is to produce work of  high aesthetic value which is functional, affordable and sustainable.


The needs and wishes of clients are carefully incorporated into the design solution and unusual building requirements or planning constraints are always looked upon as opportunities for lateral thinking and the application of non-mainstream ideas.


A holistic approach to human ecology is adopted in all design work, integrating ideas and practice relating to the provision of a healthy living environment, use of land, energy conservation, reducing waste and using renewable, recycled and recyclable materials.

Stone built country home in County Tyrone.