A web development quote can rise when the agreed work changes, an assumption proves wrong, or a pricing model allows costs to vary with actual effort. But a plausible reason for extra work does not, by itself, establish that the developer can charge more. The signed scope, price terms, change-approval process, written record and applicable law determine how to assess the increase.
Why a web development quote can increase
The key question is whether the revised charge is for work already covered by the agreement or for a change to it. Compare the original quote and signed statement of work with the new request, rather than relying on the fact that a new price was sent.
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The requested scope grew
A new feature, user flow, page type, integration or redesign may add work beyond the agreed deliverables. Ask the developer to identify the exact item that the request changes. If you believe the work was already promised, the disagreement may be about interpreting the original scope, not approving new work. UK government digital-services guidance recommends setting out the work, timescale, payment method and cost in a statement of work. Read the guidance on setting up a contract.
Requirements or technical constraints became clearer
An initial estimate may rest on incomplete discovery. As the project develops, the team may learn more about requirements, existing code, data or third-party systems. The UK Government’s Cost Estimating Guidance says estimates evolve with project scope and schedule. That is an explanation of estimating, not a rule that changes a signed fixed price.
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An assumption or dependency changed
The original price may have assumed a particular platform or API, ready-to-use content, access to an existing codebase, or timely client decisions. Ask which assumption changed, when the issue was identified, and who the agreement makes responsible for that dependency. A changed assumption does not automatically entitle either party to a price adjustment; the contract and facts matter.
The schedule shifted
A delayed decision, changed delivery date or unavailable dependency may affect effort or availability, depending on the agreement. The UK government’s sample software-development agreement includes schedule and other project impacts in its change-request process. A delay alone does not establish that repricing is authorized.
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The agreement prices effort rather than a fixed deliverable
Price language matters. Government guidance describes fixed-price, time-and-materials, and capped time-and-materials approaches. With time-and-materials pricing, the total may depend on time used; a cap can limit that exposure subject to the contract’s terms. Check whether the signed amount is a fixed price, an estimate, a budget, or a ceiling, along with rates, reporting requirements, approval thresholds and what happens at the cap.
| Arrangement | What to check | What it means for a revised total |
|---|---|---|
| Fixed price | Defined deliverables, exclusions, assumptions and any change clause | Whether the new work falls outside the agreed scope; an estimate changing is not, by itself, a change to the contract |
| Time and materials | Rates, time records, reporting and any approval rules | The total may vary with recorded work under the agreement |
| Capped time and materials | Rates, the cap, and the process for approving work near or beyond it | Costs may vary up to the applicable cap; check the agreement before treating the cap as adjustable |
The labels alone do not settle a dispute: use the signed wording and the project’s documented scope.
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What to check before agreeing to the increase
Compare the original quote, signed agreement and revised request. Gather the documents and ask for a written explanation that makes the proposed change traceable.
- Scope: deliverables, exclusions, acceptance criteria, revision rounds and stated assumptions.
- Price basis: fixed price, estimate, time-and-materials or capped pricing; rates and any not-to-exceed amount.
- Change: the exact requirement or assumption affected, who requested or changed it, and when.
- Cost and schedule impact: added work by task or role, hours or other calculation basis, rates, total cost, applicable tax, milestone effects and revised launch date.
- Approval process: whether changes require written approval, who can approve them, and whether changed work may begin before approval.
- Alternatives: remove or defer another feature, replace an in-scope item, deliver in phases, or agree a separate price for the addition.
A UK government-published software development services agreement offers a sample change request covering the change, its business benefit, the consequences of not making it, impact analysis, alternatives and approval to proceed. It is a practical example of information that can make a cost discussion auditable, not a legal requirement for every web project.
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How to handle the conversation and document a change
- Ask for the basis in writing. Request the original scope item or assumption affected, what changed, and the task-level cost and schedule impact.
- Clarify the pricing method. Ask whether the proposed work is a fixed-price change, an estimate, or time-and-materials work, and which contract term governs approval.
- Pause unapproved extra work. If you do not want it to proceed yet, say so clearly in writing and follow the agreement’s change process. “Please do not start additional work until we agree in writing” is a practical request, not a universal legal formula.
- Choose whether to add, substitute or defer. Compare the change’s cost and timing with its benefit and urgency. You may be able to trade it for another item or place it in a later phase.
- Record any agreement. Put added or removed scope, price or pricing method, timeline effect, approval and changed assumptions in a signed amendment or another form recognized by the contract. UK government guidance recommends agreeing and signing later statements of work; the government template illustrates a change-request structure.
Keep the original quote, signed scope, revised estimates, emails, tickets, meeting notes and approvals together. If there is no clear written approval, the record may be important to understanding what each party requested and agreed.
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A revised number alone does not show whether the work is genuinely extra, whether the original estimate was conditional, or whether the agreement permits the change. Equally, the fact that a project estimate evolved does not automatically make a signed fixed price adjustable. The answer depends on the actual contract, documented scope, approvals, circumstances and applicable law.
Government examples have limits. UK guidance helps explain statements of work and change control but does not set rules for every private contract. The US Federal Acquisition Regulation’s change clause addresses qualifying changes within the general scope of a government contract and possible equitable adjustments; it is a federal-procurement example, not a rule for ordinary private web-development projects. See FAR 52.243-1.
This is general information, not a decision about a particular contract. For a substantial dispute, consult a qualified lawyer in your jurisdiction.
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