Pad elevation verification is checking the finished elevation of every building pad against the grading plan before the foundation crew shows up. It tells you which pads are too high, too low, or right on, while the fix is still a dirt problem and not a concrete problem.
Most developers we talk to don’t find a bad pad until a builder does. By then the footing’s been dug, the schedule’s slipping, and everybody’s pointing at everybody else.
Why Do Pad Elevations Go Wrong?
Nobody’s being careless. Pads get cut and filled over weeks, with more than one crew and more than one set of stakes. A few common culprits:
- Stakes get knocked out or run over, and the crew grades to whatever’s left.
- Rain and rework change the dirt after the last check.
- Fill gets built up fast to hit a milestone.
- The field changes, but the plan doesn’t.
Pad elevation drives a lot downstream: drainage, finished floor height, driveway slopes, and whether the house sits where the plan says it should.
Code cares too. The International Code Council, which publishes the International Residential Code, describes the requirement as a 6 inch drop within the first 10 feet from the foundation. A pad that’s off can make that hard to hit. Your engineer and local jurisdiction set the final rules.
Checking one pad with a rod and level is easy. Checking every pad in a 60-lot community is where it gets slow, and where drone data helps, because it covers the whole site at once instead of one stake at a time.
How Does Pad Elevation Verification Work?
Here’s a very oversimplified workflow. We set up a base station, collect GCP data, and fly the site with an RTK drone. Then we process the data into a surface and compare it to your grading plan, pad by pad.
What you get back varies by job. It might be a heat map, a contour comparison, a pad-by-pad elevation table, or some combination. Plenty of clients just want a well-formatted PDF they can forward to the grading contractor, and that works great.
What Does Pad Elevation Verification Tell You?
You get answers lot by lot:
- Which pads are above or below plan elevation
- By how much
- Where more cut or fill is still needed
- Which lots are good to hand over to the builder
Clients have told us they’ve saved $2,000 to $4,000 per off-grade lot when they get our maps before builders start. In our experience, more than half the lots on a job are off by some amount. So the check tends to pay for itself if even one lot is wrong.
A pad that’s too low usually means more fill and more compaction testing. A pad that’s too high means cutting and hauling off dirt. Either way, finding it early keeps trucks and testing off the builder’s schedule.
When Should You Run Pad Elevation Verification?
If you only do one check, do it after pads are cut to grade and before the grading crew demobilizes. Fixing a pad then takes a crew that’s already on site and a dozer, not a remobilization and a foundation redo.
On bigger jobs, check again after heavy rain or any rework. Our rough grading verification post covers the broader check that comes before this one.
Where Does Your Surveyor Fit In?
We’re not a licensed surveying firm. Your engineer or licensed surveyor still owns anything that needs a stamp or certification. Our maps help you find out where to look, fast.
On accuracy, one client quietly had a licensed surveyor measure a roughly 2,680 cubic yard stockpile to compare against our drone volume. We came within just under 10 cubic yards. That was a stockpile, not a pad, but it shows how closely drone data can match a licensed surveyor’s measurements when it’s collected carefully.
The Bottom Line
Pad elevation verification is a cheap check at the moment fixes are cheap. Verify pads after grading and before the grading crew leaves, and you’ll catch the lot that’s off before it turns into a foundation problem.
If you’ve got a community coming up and want pads checked, reach out anytime. We’ve been doing this since 2018, and we typically respond within one business day. You can also see our drone construction services for what else we map on active job sites.
