CHANGE ORDER CONTROL
When to revise a quote vs issue a change order
Before the customer accepts, revise the quote. After the customer accepts, issue a change order. The boundary is acceptance — once the quote is accepted, it becomes the locked contract baseline and must not be overwritten.
- —Before acceptance: the quote is still yours to change — revise scope, pricing, or terms freely
- —After acceptance: the quote is the contract — any change goes through a separate change order
- —Do not edit the accepted quote file. The original stays locked. Changes attach separately.
The short rule
Before acceptance
Revise the quote. Update scope, adjust pricing, swap materials, change terms. The quote has no contractual weight yet. Each revision replaces the previous version. No separate record is needed. Before reissuing, confirm the contingency is sized to actual risk — use the construction contingency calculator.
After acceptance
Issue a change order. The accepted quote is now the contract baseline. It stays locked and immutable. Every post-acceptance change is recorded as a separate document tied to that baseline — priced, approved, and visible to the team.
If you edit the accepted quote instead of issuing a change order, the contract baseline is destroyed. Downstream teams — billing, operations, project management — can no longer see what was originally agreed versus what changed.
Decision matrix: revise quote or issue change order
Use this table to decide the correct action based on where the job stands in the workflow.
| Situation | Revise quote | Issue change order | Why |
|---|---|---|---|
| Customer has not responded to the quote yet | Yes | No | No contract exists. The quote is still a working document. |
| Customer requests a scope change before accepting | Yes | No | Still pre-acceptance negotiation. Revise and reissue the quote. |
| Material pricing changes before the quote is accepted | Yes | No | Cost updates before acceptance are revisions, not contract changes. |
| Quote accepted, customer wants additional scope | No | Yes | The baseline is locked. Additional scope goes through a change order. |
| Quote accepted, customer wants to change materials | No | Yes | Material substitution after acceptance is a scope change, not a revision. |
| Quote accepted, site conditions differ from assumptions | No | Yes | Condition-driven scope changes are post-acceptance modifications. |
| Quote accepted, you notice a pricing error in your favour | No | Yes | Do not silently edit the accepted quote. Issue a change order if the error affects the contract value. |
| Quote sent, customer asks for a different layout before accepting | Yes | No | Layout changes during negotiation are quote revisions. |
When to revise the quote (pre-acceptance changes)
Quote revisions are pre-acceptance changes. The quote has no contractual weight yet, so you are free to update scope, pricing, materials, or terms without creating a separate change record. For broader guidance on how cost volatility should shape your quote structure before it goes out, see the pricing volatility and quote risk hub.
Customer requests scope changes during negotiation
The customer reviews the quote and asks for additional outlets, a different equipment model, revised fixture counts, or a changed layout. This is normal pre-acceptance negotiation. Revise the quote, update the affected line items, and reissue. No change order is needed because no contract baseline has been established yet.
Material or subcontractor costs change before acceptance
A supplier reprices copper cable between the day you quoted and the day the customer responds. A sub pulls their pricing because the job sat in the approval queue past their validity window. Update the line items and reissue the quote. The customer is receiving your current best price, not a stale number from weeks ago. For the decision on whether to protect against further cost movement before the next quote goes out, see when to use an escalation clause instead of absorbing the risk.
You catch a pricing error before the customer accepts
An incorrect unit rate, a wrong quantity, or a markup that did not get applied. If the quote has not been accepted yet, correct it and reissue. The original version is still just a draft. There is no contract to amend — only a working document to fix.
The customer asks for alternatives or value engineering
During the bid process, the customer requests a cheaper equipment option, a different material specification, or a reduced scope to bring the total down. Revise the quote to reflect the requested changes. This is still pre-acceptance refinement. Each revision replaces the previous version until one is accepted. For guidance on keeping revisions under control, see quote governance basics for contractor teams.
When to issue a change order (post-acceptance changes)
Change orders are for post-acceptance changes. The quote is now the contract baseline. It stays locked. Every modification is a separate record — priced, approved, and visible.
Customer adds scope after accepting the quote
The customer approved the quote for 24 power points and now wants 6 more, plus a dedicated circuit for a server room. This is new scope added to an accepted contract. Issue a change order with the additional line items priced at current rates, apply standard markup, and get approval before the extra work proceeds. The original quote stays as the baseline. Use the change order impact calculator to estimate how the addition affects total contract value and margin. For guidance on pricing uncertain scope when original assumptions no longer hold, see how to price uncertainty in contractor quotes.
Site conditions differ from what was assumed in the quote
The quote was based on drawings showing a clear ceiling cavity. On site, the cavity is full of existing services that require rerouting. The additional labour and materials were not in the original scope. Issue a change order for the condition-driven work. Do not go back and edit the accepted quote to include it — that destroys the baseline and makes the contract value ambiguous.
Customer changes materials or specifications after acceptance
The customer approved a quote based on standard commercial-grade fixtures and now wants to upgrade to a premium line. The material cost difference and any labour impact from the spec change need to be captured in a change order. The original quote — with the original fixture specification — stays as the contract baseline.
Design changes or engineering revisions arrive after contract
The engineer revises the drawing set after the quote is accepted. Duct sizes change, pipe routes shift, equipment locations move. The scope impact is real and the cost impact is measurable. Issue a change order that references the revised drawing, quantifies the cost difference, and records the approval. Do not overwrite the original scope in the accepted quote. For the broader discipline of keeping quotes clean after they are sent, see why quotes should be locked after sending.
Common mistakes that break the contract baseline
These are the errors that create record confusion, margin leakage, and downstream billing problems.
Editing the accepted quote instead of issuing a change order
The most damaging mistake. When the customer requests a change after acceptance, someone opens the original quote file and modifies it. The baseline is gone. No one can tell what was originally agreed and what was added later. Billing sees one number. Operations sees another. The contract value is ambiguous from that point forward. The correct action is always a separate change order that supplements — never replaces — the accepted quote.
Using a change order for pre-acceptance negotiation cleanup
Change orders are for post-acceptance contract changes. If the customer has not accepted the quote yet and you are still negotiating scope, pricing, or terms, that is a quote revision — not a change order. Calling pre-acceptance negotiation a change order inflates the change-order count, confuses the record, and makes the job look more volatile than it is. Revise the quote until one version is accepted. Then switch to change orders.
Issuing a change order without pricing it with the same discipline as the original quote
Change work that is priced loosely — estimated from memory, marked up inconsistently, or bundled without line-item detail — creates margin drift. Some changes turn a profit. Others lose money silently because they were never properly costed. Price every change order with current material costs, standard labour rates, and the same markup structure as the original quote. To model what a material cost change does to your job margin before pricing the change order, use the material escalation impact calculator. For the full discipline around this, see why contractors lose money on scope changes.
Starting extra work before the change order is approved
Once the additional work is underway, leverage drops to near zero. The customer has received the value. Negotiating price after delivery is always harder than negotiating before. If timing pressures require starting early, get at minimum a written acknowledgment of the price before the work is substantially complete. To quantify the daily cost of delays while waiting for approval, use the delay cost impact calculator.
Keeping the change-order record invisible to the team
When change orders live in a project manager's inbox or a superintendent's notebook, the billing team invoices against the original quote, operations works from an outdated scope, and the final contract value is a mystery until someone manually reconstructs it. Change orders need to be visible to every team that touches the job. Use the change order log builder to keep a structured, shareable record. When billing against both the original quote and approved change orders, use the time and materials invoice builder to keep the line items clear.
Trade examples: pre-acceptance revisions vs post-acceptance change orders
How the revise-vs-change-order decision plays out across three common trades.
HVAC — chiller replacement with late duct modification
Pre-acceptance
The contractor submits a chiller replacement quote. The customer reviews it and asks for a larger unit to handle future expansion, plus revised refrigerant piping routes. The contractor updates the line items, adjusts the equipment cost, and reissues the quote. No change order — this is a revision during negotiation.
Post-acceptance
The customer accepts the revised quote. Two weeks into installation, the building manager requests additional ductwork to serve a repurposed storage area. The original quote did not include this scope. The contractor issues a change order for the additional ductwork, priced at current material and labour rates, with standard markup. The accepted quote stays locked as the baseline.
Electrical — commercial fitout with customer-driven scope additions
Pre-acceptance
The contractor quotes a tenant fitout with 120 power points and a standard distribution board. During the bid review, the tenant asks to swap 20 standard outlets for USB-C combo units and upgrade the board from 24-way to 36-way. The contractor revises the quote to reflect the changes and resubmits. Still pre-acceptance. Still a revision.
Post-acceptance
The tenant approves the revised quote. After the first fix is complete, the tenant requests data cabling to 15 additional locations that were not in the original scope. The contractor issues a change order for the extra data runs, priced per point at current rates, with labour and materials itemised. The original accepted quote remains the contract baseline. Billing can see both the baseline and the change order clearly.
Plumbing — multi-storey buildout with site-condition discovery
Pre-acceptance
The contractor submits a quote for a multi-storey plumbing fitout based on the issued drawings. The project manager reviews it and asks for an upgraded fixture specification on levels 3 and 4 — commercial-grade to premium. The contractor revises the affected fixture line items and reissues the quote. No change order needed — the quote has not been accepted yet.
Post-acceptance
The customer accepts the quote. During demolition on level 1, the crew discovers that existing drainage runs differ from the drawings. The rerouting requires additional pipe, fittings, and two days of extra labour. The contractor issues a change order documenting the condition, the scope addition, and the cost. The accepted quote stays untouched. The combined value — original quote plus approved change order — becomes the new contract total that billing works from.
Frequently asked questions
Can I revise a quote after the customer accepts it?
No. Once a quote is accepted, it becomes the contract baseline. That baseline must stay locked and immutable. Any change to scope, pricing, materials, or terms after acceptance goes through a separate change order — never by editing the original quote.
What if the customer approved by email?
Email approval is acceptance. If the customer replied confirming they accept the quote — by email, text, portal, or any written medium — the quote is now the contract baseline. Switch from revision mode to change order mode from that point forward.
What if I found a pricing mistake before approval?
If the customer has not accepted the quote yet, correct the mistake and reissue. The quote is still a working document. There is no contract to amend — only a draft to fix. Revise and resend with the corrected pricing.
What if the scope changed after acceptance?
Issue a change order. After acceptance, the quote is the contract baseline and it stays locked. Scope additions, material substitutions, spec changes, and condition-driven work are all post-acceptance modifications. Each one gets its own change order — priced, approved, and recorded separately.
Do small clarifications still need a change order?
If the clarification changes the scope, the price, or the contract value, yes. Small does not mean exempt. If it affects what was agreed, document it as a change order. If it is purely informational — confirming a colour, clarifying an access point, answering a question — no change order is needed.
What should a change order show?
A change order should show the reference to the accepted quote baseline, a clear description of the change, the reason for the change, the cost impact broken down by labour, materials, and any other affected categories, the revised contract total including the change, and the approval signature or acknowledgment from the customer.
When does customer acceptance actually happen?
Acceptance happens when the customer communicates approval of the quote — whether by signing it, replying by email, confirming through a portal, or giving written approval by any medium. The moment acceptance is communicated, the quote becomes the contract baseline and can no longer be revised.
Keep the baseline clean. Control what comes after.
Quoteloc helps contractor teams lock accepted quotes as immutable baselines, record change orders separately with clear pricing, and keep the contract value record visible to every team that needs it. Revision control before acceptance. Structured change orders after. For the full discipline — baseline protection, common change triggers, and the failure patterns that create margin leakage — see the change order control hub.