What Are Liquidated Damages (LADs) in Construction?

<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="#how-lads-work-the-timeline">How LADs Work: The Timeline</a></li><li><a href="#using-evm-to-predict-lad-exposure">Using EVM to Predict LAD Exposure</a></li><li><a href="#the-legal-requirements-for-valid-lads">The Legal Requirements for Valid LADs</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>Liquidated damages (LADs) are pre-agreed damages payable by the contractor to the client for late completion of the works. They're written into the contract before a single spade hits the ground. The rate is fixed, usually a daily or weekly sum, and they start accruing the moment you pass the contractual completion date without achieving practical completion. No negotiation. No argument about quantum. The number is the number. </p><p>LADs exist because proving actual losses from delay is expensive, slow, and uncertain. Instead, both parties agree upfront: "If you're late, you pay £X per day." For the client, it's certainty. For the contractor, it's a capped risk, because LADs replace the client's right to claim uncapped general damages for delay. </p><p>That last point is the one most people miss. LADs are a ceiling, not just a penalty. </p><p>This term is part of the <a href="/en/earned-value/definitions">earned value definitions glossary</a>. For how <a href="/en/earned-value/definitions/schedule-performance-index">SPI</a> and schedule variance predict LAD exposure, see the <a href="/en/earned-value/cpi-spi">CPI and SPI formulas page</a>. </p><h2 id="how-lads-work-the-timeline">How LADs Work: The Timeline</h2><pre class="ge-ascii-diagram ge-anim"> LAD TRIGGER AND ACCUMULATION TIMELINE Project Start Contractual Actual │ Completion Completion │ Date (CCD) Date ▼ ▼ ▼ ────┼─────────────────────────────┼════════════════════┼──────── │ CONTRACT PERIOD │ LAD PERIOD │ │ (no LADs accruing) │ (£2,500/day) │ │ │ │ │ 15 Jan 2025 │ 14 Jul 2025 │ 4 Aug 2025 │ │ │ │ │◄── 21 days late ──►│ │ │ │ │ │ LADs = 21 x £2,500│ │ │ = £52,500 │ KEY DATES: ────────── 15 Jan 2025: Works commence 14 Jul 2025: Contractual completion date (26 weeks) 04 Aug 2025: Actual practical completion (21 days late) LADs DEDUCTED: £52,500 from payment (or set off against amounts otherwise due) IMPORTANT: If contractor has been granted an Extension of Time (EOT), the CCD moves forward. LADs only apply after the REVISED completion date. </pre><p>The critical distinction: LADs don't start at the original completion date if the contractor has a valid entitlement to an extension of time. Under NEC4, a <a href="/en/earned-value/definitions/compensation-event">compensation event</a> that delays the Completion Date moves the date forward. LADs only kick in after the revised date. Under JCT, the same principle applies through the EOT mechanism. </p><p>I've seen contractors pay LADs they didn't owe because they failed to claim the EOT they were entitled to. On one £15M education project, the contractor was 6 weeks late but had legitimate delay events covering 5 of those weeks. They hadn't notified properly. Cost them £87,500 in LADs for one week of genuine delay, plus £437,500 for five weeks they could have avoided. </p><h2 id="using-evm-to-predict-lad-exposure">Using EVM to Predict LAD Exposure</h2><p>This is where earned value connects to real commercial consequences. <a href="/en/earned-value/definitions/schedule-performance-index">Schedule Performance Index</a> and <a href="/en/earned-value/cost-schedule-variance">Schedule Variance</a> can predict whether you're heading for a LAD event months before the completion date arrives. </p><span class="ge-worked-label">Worked Example</span><div class="ge-callout ge-anim"><p><strong>Scenario:</strong> £10M commercial fit-out. 40-week programme. LADs at £2,500 per calendar day. Current status at week 28 (70% through the programme).</p><br><p><strong>EVM snapshot:</strong></p><p>- BAC: £10,000,000</p><p>- PV (week 28): £7,200,000</p><p>- EV (week 28): £6,120,000</p><p>- SPI = EV / PV = £6,120,000 / £7,200,000 = <strong>0.85</strong></p><p>- SV = EV - PV = £6,120,000 - £7,200,000 = <strong>-£1,080,000</strong></p><br><p><strong>What SPI 0.85 means for completion:</strong></p><br><p>Using earned schedule, the project has earned the value that was planned for approximately week 23.8 (£6,120,000 on the PV curve corresponds to roughly week 24). That's 4 weeks behind schedule at the 28-week mark.</p><br><p><strong>Projected delay:</strong> If SPI remains at 0.85 for the remaining 12 weeks of planned work, the project needs approximately 40 / 0.85 = 47 weeks total. That's 7 weeks late.</p><br><p><strong>Projected LADs:</strong> 7 weeks x 7 days x £2,500 = <strong>£122,500</strong></p><br><p><strong>The decision point:</strong> At week 28, the commercial team has 12 weeks to either:</p><p>1. Accelerate (costs money but avoids LADs)</p><p>2. Claim EOT for qualifying delay events (reduces the LAD window)</p><p>3. Accept the LADs (sometimes cheaper than acceleration)</p><br><p><strong>The maths of acceleration vs LADs:</strong></p><p>- Acceleration cost estimate: £85,000 (weekend working, additional labour)</p><p>- Projected LADs without acceleration: £122,500</p><p>- Net saving from acceleration: £37,500</p><p>- Decision: Accelerate. But only because the team caught it at week 28, not week 38.</p></div><h2 id="the-legal-requirements-for-valid-lads">The Legal Requirements for Valid LADs</h2><p>LADs must be a genuine pre-estimate of the client's likely loss from delay. If the rate is set punitively high (to punish the contractor rather than compensate the client), a court may strike it down as a penalty. Since the Supreme Court ruling in <em>Cavendish Square Holding v Makdessi</em> (2015), the test is whether the clause is "out of all proportion to any legitimate interest" of the innocent party. </p><p>In practice, most construction LADs survive challenge because clients can point to real losses: rent foregone, alternative accommodation costs, business disruption, financing costs on an asset that isn't generating revenue. </p><p>Typical LAD rates in UK construction: </p><div class="ge-table-wrap ge-anim"><table class="ge-table"><thead><tr><th>Project Type</th><th>Typical LAD Rate</th><th>Basis</th></tr></thead><tbody><tr><td>Residential (per unit)</td><td>£50 to £150 per unit per week</td><td>Rent/mortgage cost, temporary housing</td></tr><tr><td>Commercial office</td><td>£2,000 to £15,000 per day</td><td>Lost rental income</td></tr><tr><td>Retail</td><td>£5,000 to £25,000 per day</td><td>Trading losses, seasonal impact</td></tr><tr><td>Education</td><td>£1,000 to £5,000 per day</td><td>Temporary classroom hire</td></tr><tr><td>Healthcare</td><td>£3,000 to £10,000 per day</td><td>Service disruption, temporary facilities</td></tr><tr><td>Infrastructure</td><td>£2,500 to £50,000 per day</td><td>Network revenue, public disruption</td></tr></tbody></table></div><p>These are illustrative. Actual rates depend on the specific losses the client can evidence. </p><h2 id="common-mistakes">Common Mistakes</h2><ol><li><strong>Not claiming EOT when entitled</strong>: Every week of unclaimed EOT is a week of unnecessary LAD exposure. Under NEC4, the contractor must notify compensation events within 8 weeks (clause 61.3). Miss the time bar and the Completion Date stays where it is, even if the delay was the Client's fault.</li><li><strong>Treating LADs as a fine rather than a cap</strong>: LADs replace the client's right to claim general damages for delay. If the contract includes valid LADs, the client can't claim beyond the LAD amount for delay losses. Contractors sometimes forget this works in their favour. A client's actual daily loss might be £15,000, but if LADs are set at £5,000 per day, £5,000 is all they can recover.</li><li><strong>Ignoring sectional completion LADs</strong>: Many contracts have LADs for individual sections, not just overall completion. You might complete the building on time but hand over the car park 2 weeks late. If sectional LADs apply, you're paying. Track <a href="/en/earned-value/definitions/schedule-performance-index">SPI</a> at the section level, not just the project level.</li><li><strong>Not tracking the LAD exposure in the cost forecast</strong>: Your <a href="/en/earned-value/definitions/estimate-at-completion">EAC</a> should include a risk allowance for LADs whenever SPI is below 1.0. Too many <a href="/en/earned-value/definitions/cost-performance-report">cost reports</a> forecast the construction cost accurately but ignore the £200K of LADs building up in the background.</li><li><strong>Assuming LADs stop at practical completion</strong>: They do for delay damages. But some contracts include separate LADs for failure to achieve specific milestones (key dates under NEC4). Check your contract. Don't assume.</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, giving you accurate earned value data without manual spreadsheet updates. <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>Are liquidated damages a penalty?</h3><p>Not if they're a genuine pre-estimate of the client's likely loss. English law distinguishes between liquidated damages (enforceable) and penalties (unenforceable). The <em>Cavendish</em> test asks whether the amount is proportionate to the claimant's legitimate interest in performance. In construction, where delay losses are real and quantifiable, LADs almost always survive challenge. </p><h3>Can a contractor recover LADs already deducted?</h3><p>Yes, if they subsequently prove an entitlement to an extension of time that moves the completion date beyond the period for which LADs were deducted. Under NEC4, if a compensation event is assessed and the Completion Date is changed retrospectively, any LADs deducted for the revised period should be repaid. The practical challenge is timing, the money is already out of the contractor's cash flow. </p><h3>How do LADs interact with NEC4 compensation events?</h3><p>A compensation event that delays completion moves the Completion Date forward under clause 63. LADs are assessed against the revised Completion Date, not the original one. So a 4-week CE that's properly notified and assessed effectively shifts the LAD trigger point by 4 weeks. This is why notification under clause 61.3 isn't just a contractual formality. It's direct financial protection against LADs. </p><h3>What happens if the contract doesn't include LADs?</h3><p>The client's remedy is general damages, meaning they must prove their actual loss caused by the delay. This is harder, slower, and more expensive for the client to pursue. But it's also uncapped. Without LADs, a delay that costs the client £5M in lost revenue is a £5M claim. With LADs set at £3,000 per day, it's whatever the LAD formula produces. The cap cuts both ways. </p></article></div>