What Is Earned Value Management (EVM)? Construction Guide

<div class="ge-article-wrapper"> <nav class="ge-toc" aria-label="Table of contents"> <p class="ge-toc-label">In this article</p> <ul class="ge-toc-list"> <li><a href="#the-evm-tripod-three-inputs-everything-else">The EVM Tripod: Three Inputs, Everything Else</a></li> <li><a href="#how-evm-works-the-core-mechanism">How EVM Works, The Core Mechanism</a></li> <li><a href="#why-evm-matters-on-uk-construction-projects">Why EVM Matters on UK Construction Projects</a></li> <li><a href="#worked-example-28m-water-treatment-works">Worked Example: £28M Water Treatment Works</a></li> <li><a href="#when-evm-works-and-when-it-doesnt">When EVM Works (And When It Doesn't)</a></li> <li><a href="#nec4-mapping">NEC4 Mapping</a></li> <li><a href="#common-mistakes">Common Mistakes</a></li> <li><a href="#frequently-asked-questions">Frequently Asked Questions</a></li> </ul> </nav> <article class="ge-article-body"> <p>Earned value management (EVM) is a project controls methodology that measures physical progress against a cost-loaded baseline to determine whether a construction project is on budget and on programme. EVM gives you three numbers, what you planned to spend, what the work is worth, and what you actually spent, and from those three numbers, you can diagnose almost any commercial problem on a project.</p> <p>On the <a href="/en/earned-value">earned value management guide</a>, we cover the full framework. This page focuses on what EVM actually is and why it matters commercially.</p> <h2 id="the-evm-tripod-three-inputs-everything-else">The EVM Tripod: Three Inputs, Everything Else</h2> <div class="ge-table-wrap ge-anim"><table class="ge-table"> <thead><tr><th>Metric</th><th>Full Name</th><th>What It Measures</th><th>Source</th></tr></thead> <tbody> <tr><td><a href="/en/earned-value/definitions/planned-value">PV</a></td><td>Planned Value</td><td>Budgeted cost of work scheduled</td><td>Cost-loaded baseline programme</td></tr> <tr><td><a href="/en/earned-value/definitions/earned-value">EV</a></td><td>Earned Value</td><td>Budgeted cost of work completed</td><td>Physical progress measurement</td></tr> <tr><td><a href="/en/earned-value/definitions/actual-cost">AC</a></td><td>Actual Cost</td><td>Actual cost of work performed</td><td>Cost reporting system</td></tr> </tbody></table></div> <h2 id="how-evm-works-the-core-mechanism">How EVM Works, The Core Mechanism</h2> <p>Compare EV against PV for schedule status. Compare EV against AC for cost status. CPI of 0.90 means you're getting 90p of value for every £1 spent. SPI of 0.85 means you're delivering 85% of planned progress.</p> <h2 id="why-evm-matters-on-uk-construction-projects">Why EVM Matters on UK Construction Projects</h2> <p>Once cumulative CPI drops below 0.90 by the 20% completion mark, it almost never recovers. EVM doesn't prevent overruns. It surfaces them early enough to do something about it.</p> <h2 id="worked-example-28m-water-treatment-works">Worked Example: £28M Water Treatment Works</h2> <span class="ge-worked-label">Worked Example</span> <div class="ge-callout ge-anim"> <p><strong>Scenario:</strong> £28M water treatment works under NEC4 Option C. At month 5: PV = £9.1M, EV = £7.84M, AC = £9.52M. CPI = 0.82. EAC = £34.1M. A £6.1M projected overrun.</p> <p>This triggers an immediate <a href="/en/earned-value/definitions/early-warning">early warning</a> under clause 16.1. Investigation found 70% of the variance in two packages: process pipework and MEICA installation.</p> </div> <h2 id="when-evm-works-and-when-it-doesnt">When EVM Works (And When It Doesn't)</h2> <p>EVM works well when project value exceeds £5M, programme is longer than 6 months, and there's a credible cost-loaded baseline. It struggles when the baseline is fiction or nobody reads the reports.</p> <h2 id="nec4-mapping">NEC4 Mapping</h2> <div class="ge-table-wrap ge-anim"><table class="ge-table"> <thead><tr><th>EVM Concept</th><th>NEC4 Equivalent</th></tr></thead> <tbody> <tr><td>BAC</td><td>Target total of the Prices</td></tr> <tr><td>PV</td><td>Cumulative budgeted Defined Cost from Accepted Programme</td></tr> <tr><td>EV</td><td>Budgeted Defined Cost of work performed</td></tr> <tr><td>AC</td><td>Defined Cost (actual)</td></tr> <tr><td>Baseline change</td><td>CE implementation adjusting the target</td></tr> </tbody></table></div> <h2 id="common-mistakes">Common Mistakes</h2> <ol> <li><strong>Implementing EVM without a cost-loaded programme.</strong></li> <li><strong>Reporting without acting.</strong></li> <li><strong>Not updating BAC for compensation events.</strong></li> <li><strong>Measuring progress at package level only.</strong> Always report at package level as well.</li> </ol> <div class="ge-product-note ge-anim"> <p><strong>How Gather helps.</strong> Gather's AI reads your site diaries daily and maps progress against your cost-loaded programme. <a href="https://gatherinsights.com/contact">Book a demo</a> to see it working on a live NEC4 project.</p> </div> <h2 id="frequently-asked-questions">Frequently Asked Questions</h2> <h3>Is EVM mandatory on NEC4 contracts?</h3> <p>No. NEC4 doesn't mention earned value management by name. However, NEC4 Option C requires cost and programme information that effectively enables EVM. Some clients specify EVM requirements in the Works Information.</p> <h3>What's the minimum project size for EVM?</h3> <p>Around £5M for basic EVM (CPI and SPI tracking) and £20M for formal EVMS.</p> <h3>How does EVM relate to the monthly CVR?</h3> <p>A CVR compares planned margin against actual margin. EVM goes further by tracking efficiency (CPI) and programme performance (SPI) and producing forecasts (EAC, ETC). Both should run in parallel on NEC4 Option C.</p> </article> </div>