What is a variation quote in construction?

A supplementary quote describes and prices services that are added to or modified from the original contract. It provides clarity regarding scope, quantities, deadlines, and costs before work begins. This ensures that project changes are clearly distinguished from the existing contract.

When is a supplementary quote required?

Construction projects evolve. A client may request different materials, plans may be adjusted, or necessary additional work may not have been included in the original scope. If the new work is sufficiently defined before execution, it can be described and calculated in a supplementary quote.

The supplement should maintain a link to the main contract while remaining identifiable as a distinct change. This makes it easy to track later which costs belong to the original scope and which resulted from the change.

What should be included in a supplementary quote?

Reference to the project, main quote, or contract
Reason for and brief description of the change
Clear line items with quantities and units
Unit or fixed prices and terms
Impact on deadlines, project phases, or other services
Assumptions, exclusions, and work not included
Version, date, and approval status

Example

After the contract is awarded, the client requests additional fall protection for twelve windows. The original quote does not include this service. The company prepares a variation order detailing the twelve units, materials, installation effort, and impact on the schedule. The change is only incorporated into the execution plan after approval.

Variation order or time and material work?

A variation order is suitable when the scope and price can be calculated in advance. Time and material work is billed based on actual effort and is useful when this cannot yet be reliably determined or when work must begin on short notice. If urgent additional work is carried out on a time and material basis, the reason should still be clearly documented.

From variation order to final measurement

Once accepted, the variation order becomes part of the project documentation. Its items should remain traceable in planning, execution, and final measurement separately from the main scope. This makes it possible to demonstrate later which quantities belong to the original contract and which belong to the variation order.

Common mistakes

The variation order specifies only an amount, but no concrete scope of work.
The reference to the original item or plan change is missing.
Schedule implications and prerequisites are not mentioned.
Multiple versions are circulating without a clear status.
Quantities already executed will not be assigned to the change order later.

Manage change order quotes digitally

A digital change order quote can be linked directly to the existing project and the main quote. This keeps items, documents, and statuses together. With Caturix Quotes , you can manage change orders as separate quotes within the project instead of losing them in emails and separate spreadsheets.

Frequently asked questions about change order quotes

Should a change order be approved before work begins?

If time and circumstances permit, prior agreement provides the greatest clarity. For urgent work, you should at least document who authorized the change and how the costs will be tracked.

Is a change order automatically part of the main contract?

Its contractual effect depends on the agreement, approval, and project terms. Operationally, the status should therefore be clearly documented rather than relying on verbal recollection.

Can a change order contain NPK items?

Yes. If suitable items are available, a change order can be structured just like the main bill of quantities. Individual additional services can be added as clearly labeled custom text.

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