GPS grading models built right. Back fast.

3DDIRT builds machine control grading models for excavation and grading contractors nationwide. Every model is built in the USA by our own model techs. No AI. Send your plans and CAD and get a field-ready grading model at a price that keeps your bid tight.

USA model buildersNo AI used

  • Topcon
  • Trimble
  • Leica

Delivered in the format your rover and machines load.

Get a grading model quote

Tell us about the job. We'll reply by email with next steps.

Plans and CAD (optional) Upload files PDF, DWG, DXF or zip. Opens a secure upload page in a new tab.

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Need to discuss your project first? Call us
25,000+GPS grading models built and in the field
10USA-based grading model techs on our build team
3-stepQuality control review on every grading model
FastTurnaround with affordable pricing

From plans to grade in three steps

  1. Send your files

    Upload the plan set and CAD. We confirm scope and price before we start.

  2. We build and QC

    A USA-based grading model tech builds your surfaces and linework by hand, no AI. Every grading model clears our 3-step review before it ships.

  3. Load it and grade

    You get files ready for Topcon, Trimble or Leica. Revisions are quick when the plans change.

GPS grading model questions

What is a GPS grading model?

A GPS grading model is the 3D design surface and linework your machine control system uses to guide dozers, excavators and graders to finish grade. 3DDIRT builds it from your plan set and CAD files.

Which machine control systems do you build GPS grading models for?

Topcon, Trimble and Leica. We deliver the model in the format your rover and machines load, including mixed fleets.

What files do you need to build a grading model?

Send the plan set (PDF) and the CAD files (DWG or DXF). You can upload them on this page or after you request a quote.

Is AI used to build your grading models?

No. Every 3DDIRT grading model is built by hand by USA-based model techs on our 10-person in-house build team. No AI is used.

How do you check grading model quality?

Every model goes through a 3-step quality control review before it ships, so busts get caught in our office, not on your grade.

How many GPS grading models has 3DDIRT built?

Over 25,000 GPS grading models for excavation and grading contractors.

Do you work with contractors outside California?

Yes. 3DDIRT builds GPS grading models for excavation and grading contractors nationwide across the USA.

How do I get a quote for a GPS grading model?

Fill out the quote form on this page with your name, company, email and phone, add the date you need it, and upload your plans and CAD if you have them. We reply by email with next steps.

Your next job deserves a grading model you don't have to second-guess.

Get a quote