Quote Revisions: Keep the Original Scope and Change Basis Visible

Preserve the quote that was actually issued

A revision is easiest to assess when the previous quote remains intact. Keep the original customer request, drawing and specification references, estimate assumptions, supplier evidence, exclusions, and issued PDF together. That record is the comparison point for a later addendum, clarification, or customer request.

Do not overwrite the original total and then try to remember why it changed. Create a new working revision, link it to the earlier issue, and record the date, source document, and reviewer. This is a practical estimating control, not a statement about the legal effect of any particular contract.

Identify the changed evidence before repricing

Start with the evidence rather than the new price. List the document or communication that changed, its revision or date, the affected drawings or line items, and whether the change alters quantity, material, process, finish, access, program, delivery, or commercial terms. If the information is incomplete, record the clarification required.

NSW Government construction procurement guidance describes a variation as a change to the contracted work and recommends evaluating the cost and time implications before issuing a written instruction where possible. That guidance is for its own construction context, but it supports a useful estimating discipline: connect every revised number to an identified change and keep the written basis visible.

Separate the components of the revised estimate

A reviewer should be able to see what was added, deleted, refreshed, or left unchanged. Keep new material, labour, plant or equipment, subcontract, freight, administration, and margin inputs separate from the original scope. Where a change affects sequencing, lead time, rework, or supplier validity, describe the impact and the information used to estimate it.

Do not use an “extra over” amount without enough detail for review. The relevant cost treatment depends on the quotation, project documents, and agreement between the parties. The estimator’s job is to make the assumptions and basis clear; the appropriate commercial or legal approval remains with the responsible team.

Check the new total against the old basis

Before issue, compare the original and revised scope line by line. Confirm that deleted work is not still priced elsewhere, that added work is not counted twice, and that the quote still names the correct drawing revision and validity conditions. If supplier pricing or takeoff evidence has changed, attach or reference the refreshed evidence.

A concise revision note can answer the questions a customer and internal reviewer need: what changed, what did not change, what documents apply, what has been priced, what remains subject to clarification, and what happens to timing or validity. Avoid implying that a draft estimate is an approved contract instruction.

Issue a controlled replacement

Give the revised quote its own identifier and issue date. State whether it replaces the previous quote in full or changes only named items. Keep the previous version available internally, and retain the response or approval trail with the revision evidence.

For adjacent controls, see how to review RFQ files before quoting and how to keep estimating assumptions visible before quote review.

Where Kwantflow fits

Kwantflow can keep the incoming RFQ evidence, estimator notes, quote options, assumptions, exclusions, and issued revisions together in a local workspace. It helps make the revision basis reviewable, while the estimator and authorised commercial team remain responsible for scope interpretation, pricing, and final approval.

Sources

NSW Government: Construction procurement guide, managing variations, retrieved 2026-07-16. This source is used for general written-change and cost-and-time review principles, not as legal advice for private fabrication contracts.

Method

This article presents an evidence-and-review method for fabrication quote revisions. It does not determine contractual rights, authorise a variation, provide legal advice, or make customer or performance claims. Use the applicable agreement and qualified commercial or legal advice where required.