What We Do

Utility Tracing


There is now widespread recognition that failing to identify and locate utility apparatus prior to excavation has an impact not only on project costs and timings but also has major Health and Safety implications. Existing service record drawings should be the starting point for any assessment but the plans are rarely comprehensive and their accuracy can be variable.

Further work in the form of a non-intrusive survey is required to comply with Section 60 of HSG47 ‘Avoiding danger from underground services’ published by the Health and Safety Executive in 2000. The guidelines detail what sort of devices should be used, including radio frequency locators (RFL) and ground penetrating radar (GPR), and requires that they should be used by suitably trained and experienced operators.


A simple non-intrusive utility tracing survey undertaken prior to the commencement of site work can provide clear and accurate results on the amount and location of buried services and other possible sub-surface hazards. This can:

  • help significantly reduce the health and safety risk
  • allow informed planning for future work
  • help avoid damaging the buried apparatus thereby reducing downtime and costly repairs
  • ensure that best practice and regulations are followed
  • accurately target intrusive investigations
  • minimise disruption to the site work and also to members of the public
types of survey

The Survey Association (TSA) has recently published guidance notes on the different types of utility tracing surveys that are available and categorise them into different levels of survey, all of which Phase SI can undertake in-house.

Click on a survey type below for more information:

Phase SI will always propose a survey strategy that best suits the project specific requirements using the best available equipment. We will always detail what level of survey our quote is based upon to ensure that our quote can be compared with others on a like for like basis. We can tie in our survey results using total stations or RTK GNSS systems to produce accurate CAD plans or utilities can just be marked out on site.