Variations and Change Management
Variations are where margin is quietly made or lost. A change instructed on site but never formally notified, valued, and recovered is unpaid work. This guide covers the full variation lifecycle: how to notify a variation under FIDIC Clause 13, how variations are valued, what happens when scope is omitted, how lump-sum and LSTK contracts change the risk, and how to prevent variation valuation disputes before they start.
Read together, these insights help a commercial team capture every entitlement a change creates rather than absorbing it into the contract sum by default.
In this guide
Can You Claim Loss of Profit and Overheads on Omitted Work?
8 min readVariation ManagementValuing Variations Under FIDIC: Rates, Dayworks and Fair Value Explained
8 min readVariation ManagementHow to Notify a Variation Under FIDIC (Red & Yellow Book): The Notice Mechanics That Protect Your Entitlement
8 min readVariation ManagementMissed the Variation Notice Deadline? What Time Bars Really Mean for Your Claim
8 min readVariation ManagementPreventing Disputes Over Variation Valuation Before They Start
7 min readVariation ManagementVariation Capture: The Discipline That Pays for Itself
6 min readReady to act on this?
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Frequently asked questions
How do I notify a variation under FIDIC?
Under FIDIC the Engineer instructs variations under Clause 13. The contractor must convert any informal or oral instruction into a written record, confirm it, and follow the contractual notice and valuation procedure. Doing the work first and formalising the paperwork later is the most common way a legitimate variation entitlement is lost, because the notice clock often starts when the change becomes apparent, not when the contractor decides to claim.
How are variations valued under FIDIC?
The Engineer values variations using the contract rates and prices where the varied work is of similar character and executed under similar conditions. Where it is not, new rates or daywork may apply. SME contractors frequently lose money by accepting contract rates for work that has genuinely changed in character or conditions, when a new rate would properly reflect the cost.
Can a contractor claim loss of profit on omitted work?
Sometimes. When scope is omitted by variation, the key question is whether the omission is genuine or a disguised re-packaging of the work to another contractor, which is generally not permitted. Recovery of lost profit and overhead on omitted work depends on the specific omissions clause and the facts, so each omission should be assessed rather than assumed to be either recoverable or not.
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