Before excavating in Dubai, most contractors spend more time on paperwork than on the ground: collecting no-objection certificates, requesting record drawings, and satisfying whoever controls the land or the road. That paperwork is necessary. It is also, by design, a record of what the service owners already know about. An underground utility survey checks that record against the ground. This guide explains where the survey fits, what it adds, and what it does not replace.
We are not a permitting consultant, and the exact approvals a site needs depend on its location and scope. Your consultant, main contractor or the relevant authority will tell you which apply. What follows is the practical relationship between the paperwork and the survey.
What NOCs and record drawings are for
When excavation could affect someone else's buried assets, the owners of those assets generally have to be consulted. In Dubai that typically means the power and water authority, DEWA, the telecom operators du and Etisalat, and depending on the location, the owners of sewer, drainage, irrigation, street lighting and district cooling networks. Their no-objection certificates confirm they know about the work, and they usually come with record drawings of their assets in the area.
NOCs often come with conditions attached, such as hand digging within a set distance of an asset or notifying the owner before work starts near it. Read them carefully. The survey does not change any condition. What it does is show you where the asset actually is, so you can meet the condition in the right place.
What the drawings do not show
Record drawings are only as good as what was recorded at installation, by each owner, for its own assets. In practice that leaves several gaps:
- Each owner shows only its own network, so no single drawing shows everything in the corridor.
- Lines diverted around obstructions during construction are not always redrawn.
- Abandoned and redundant lines often stay in the ground, and sometimes stay off the drawing.
- Private services inside a plot, laid by the developer or an earlier tenant, are on nobody's record.
- Depths drift. Regrading, resurfacing and landscaping change the ground level above a service, so a recorded depth may no longer be true.
Overlay four sets of drawings for a busy corridor in Downtown or Business Bay and they rarely agree with each other, let alone with the ground. Our GPR vs cable locator guide explains why some of those services cannot be found by the usual handheld tools either.
Where the survey fits in the sequence
The survey is most useful after the record drawings have arrived and before excavation is planned in detail. A sequence that works on most Dubai sites:
- Collect the NOCs and record drawings that apply to your site.
- Survey the dig area with ground penetrating radar, in a grid that covers the trench route or plot.
- Reconcile the survey with the drawings: services found where expected, services found that are on no drawing, and drawn services that the survey could not confirm.
- Paint the findings on the ground and agree the hand-dig zones, including any distances set by the NOC conditions.
- Use trial pits where identity or exact depth must be confirmed, placed using the survey rather than guessed.
- Excavate to the marked-up survey, treating it as live guidance on site rather than a document filed at the start.
A drawn service that the survey could not find is not a service that is not there. It means the ground, the depth or the material stopped the radar seeing it. Keep treating it as live.
What a GPR survey finds in Dubai ground
We survey with the Proceq GS8000, a ground radar pushed over the site on a cart. It responds to anything that contrasts with the surrounding soil, so it finds metallic and plastic services alike: power cables in ducts, water and district cooling pipes, telecom ducts, sewer and drainage pipes, irrigation lines, chambers, tanks and voids. That last group matters in villa communities, where plastic irrigation networks are dense and invisible to a cable locator.
Depth is set by the ground. Dry inland sand in Al Quoz or Dubai Investments Park reads deep; reclaimed coastal ground around the Marina and the Palm carries saline moisture and reads shallower. Most services an excavator meets sit in the top two to three metres, which the GS8000 reaches in almost all Dubai ground. How deep GPR really reads in UAE ground covers this in detail.
What radar cannot tell you
Radar shows that an object is there, where it runs and roughly how deep. It does not say whether a line is water or telecom, or whether a cable is live. Identity comes from reading the survey against the record drawings and what is visible on site, such as chambers, markers and the direction a line enters a building. Where a service cannot be identified, it is marked as unknown and treated as live until proven otherwise.
What the survey report adds to the file
The survey gives you a written record that reasonable steps were taken to establish what was in the ground. Our report, issued within 24 hours, shows the area surveyed, the services located with estimated depths, any services found that are not on the drawings, and where the ground limited the reading. For larger sites we provide a marked-up drawing over your site plan. It sits alongside the NOCs; it does not replace any of them.
Common mistakes
- Surveying only the line of the trench, then widening the excavation beyond it.
- Treating blank areas on the survey as clear ground, without checking whether the report flagged them as limited.
- Assuming a service on the NOC drawing is at the depth shown.
- Letting the paint-out fade or be covered by stockpiles before the dig reaches it.
- Surveying months before excavation on a site where other trades are still laying services.
Getting a survey in Dubai
We carry out underground utility surveys in Dubai, usually attending the same day or next morning, and across the other emirates through our GPR ground scanning service. Send the location, the trench length or area, the planned dig depth and your date on WhatsApp, along with any drawings you have. If you are weighing radar against digging trial pits, read GPR ground scanning vs trial pits.