---
id: 2026-03-29T16:01:12-0400
title: 2026-03-29 16:01:12
tags:
  - status/draft
date-created: 2026-03-29T16:01:12-04:00
daily: "[[2026-03-29]]"
---
# 2026-03-29 16:01:12

## AACE Estimate Classification

[Association for the Advancement of Cost Engineering (AACE)](https://web.aacei.org/)

AACE International Recommended Practice No. 18R-97

| Estimate Class                             | Expected Accuracy (Low) | Expected Accuracy (High) |
| ------------------------------------------ | -----------------------:| ------------------------:|
| Class 5: Concept Screening                 |            -20% to -50% |            +30% to +100% |
| Class 4: Study or Feasibility              |            -15% to -30% |             +20% to +50% |
| Class 3: Budget, Authorization, or Control |            -10% to -20% |             +10% to +30% |
| Class 2: Control or Bid/Tender             |             -5% to -15% |              +5% to +20% |
| Class 1: Check Estimate or Bid/Tender      |             -3% to -10% |              +3% to +15% |

![](https://library.aacei.org/pgd01/PGD01_Figure1.png)
