Mistake #29: Failure to Call for Utility Line Locating Before Project and Excavation

Mistake #29 in landscape design occurs when property owners or contractors begin excavation work relying solely on old topographical surveys or their own assumptions about the location of underground utilities. This leads to damage to gas, electrical, water, or sewage lines, which is fraught not only with financial losses but also with safety risks.

What is Mistake #29 and why is it dangerous?

The essence of Mistake #29 is simple: on an old site plan, utilities might be marked only schematically. These lines—often thin and inaccurate—are used for planning new irrigation, lighting, or drainage routes. However, the actual position of pipes and cables underground can differ significantly from what is drawn. Utilities might have been shifted during previous work, laid deeper or shallower, or not included in old schemes at all. When an excavator starts digging, it often discovers these discrepancies first, causing damage. This is fundamentally different from the absence of a topographical survey (which is another mistake) or designing within known protection corridors.

The danger lies not only in property damage. Damage to a gas pipeline can lead to an explosion, an electrical cable to electrocution, and a water pipe or sewer to flooding and serious sanitary problems. Repairing such accidents always costs significantly more than preventive measures.

Why are utility locating services ignored?

The reasons for ignoring this critically important procedure are varied:

• “We’re not digging deep”: A common misconception that there are no serious utilities at shallow depths. However, communication cables or small water pipe branches can lie just 30-50 cm deep. Even if the main gas pipeline lies at a depth of 0.8-1.2 m, its branches might be closer to the surface.
• “The house is already connected, everything is known”: Many believe that since the house is functional, the location of all utilities is known. But schemes can be outdated, inaccurate, or incomplete.
• Bureaucracy and waiting: Calling a specialized service for utility locating can take several days or even a week, which seems like a delay in a tight work schedule. Contractors often rush to complete a trench section in one daylight day, and owners don't want to wait for a crew's