3D Modeling

As-Built Verification from Aerial Photogrammetry

Compare actual site conditions against design surfaces. Identify deviations, document conformance, and support pay applications. Used by GCs, site developers, and engineers to verify that the work in place matches the design intent.

Request an As-Built Assessment

What Is As-Built Verification?

As-built verification compares the actual, current state of a construction site against the design surface or design model. The output is a deviation map showing where the work in place is high, low, or out of position relative to design. The map is used to verify contractor work, support pay applications, document conformance, and identify areas that need rework before the next phase.

The traditional method is surveyor-and-rod, which is slow and limited to spot checks. Aerial as-built verification produces a continuous deviation map of the entire site in a fraction of the time, and at lower cost than full-time survey crews.

When To Use It

Subgrade and rough grading. Verify that subgrade elevation matches design before base or paving goes down. Catch errors before they are buried.
Earthwork pay applications. Subcontractors get paid based on work in place. Deviation maps show quantities completed and support accurate payment.
Pile and structural verification. Confirm that pile locations, footings, and structural elements are in the correct position before vertical construction proceeds.
Dispute documentation. When contractor and owner disagree on whether work is in conformance, an as-built deviation map provides a third-party record.

What You Get

Deviation Map

A color-coded map showing where actual elevation is high (red) or low (blue) relative to design. 1-foot or 0.5-meter intervals. GeoTIFF format.

Cut-Fill Report

A tabular report showing cubic yards of cut and fill required to bring actual to design. Useful for change orders and pay applications.

3D Surface Comparison

A 3D visualization of actual vs. design surfaces, viewable in any 3D viewer. Useful for stakeholder review and dispute documentation.

Conformance Letter

An optional written conformance letter documenting the comparison, the method, and the result. Suitable for project records and lender packages.

Frequently Asked Questions

How does as-built verification compare to traditional surveyor as-builts?

Aerial as-built verification produces a continuous deviation map of the entire site rather than spot checks at specific points. It is faster and lower cost than full-time survey crews, and catches deviations the spot checks would miss. For final, stamped as-builts, we coordinate with your surveyor or a local PLS.

What is the cost of as-built verification?

Starting at $950 per survey for sites up to 5 acres. Larger sites, multiple phases, and recurring monthly verification are quoted based on acreage and complexity. The deliverable is the deviation map, cut-fill report, and 3D comparison.

How quickly can you deliver?

Standard delivery is 3-5 business days from the day of flight. Rush delivery (24-48 hours) is available for time-sensitive pay applications or phase transitions.

Can you compare against a design surface from my engineer?

Yes. We accept design surfaces in LandXML, GeoTIFF, DWG with contours, or any standard civil/survey format. We register the design to the same coordinate system as the actual surface and compute the deviation.

Request an As-Built Project Assessment

Tell us about your project and the design surface you need to compare against. We will confirm fit and recommend a documentation plan.