What estimate alternate reconciliation means in practice
Reconciliation starts with the bid form, not the estimate summary. Create one register row for each requested alternate and record whether it adds work, deducts work, or substitutes for an item already carried in the base bid. That classification controls how the option changes the total.
Use the alternates log to identify each option's source document and bid-form label. Keep the exact owner wording in the register so reviewers can tie an estimate line back to the requested option without interpreting a shortened nickname. An alternate is not always independent.
A finish upgrade may require a substrate change, and an equipment option may change electrical or structural work. Record those dependencies beside the affected option before extending totals. The contractor retains the final decision on bid treatment and qualifications.
A practical workflow
Copy the alternate names and numbering from the latest bid form. Then list the drawings, specification sections, addenda, and clarifications that define each scope change. If two documents conflict, leave the row open and assign the question instead of choosing silently.
Build each alternate as a delta from the accepted base scope. Show removed quantity and cost separately from added quantity and cost. For a substitution, this prevents the added material from appearing without the corresponding base-scope credit.
Apply overhead, profit, bond, tax, or other markups according to the bid instructions and the estimate's approved basis. Record whether a supplier or subcontractor quote includes those items. A single adjustment column should never conceal both a scope correction and a markup correction.
Tie the reconciled amount to the bid form twice: once option by option and once as a combined scenario for any permitted selections. The second check catches dependencies and duplicate credits that remain invisible when each row is reviewed alone.
Common risks to watch
Double counting often begins when an alternate price is built as a full standalone scope even though part of that work remains in the base estimate. A visible base credit and alternate add make the net change reviewable. Dependent alternates create another trap.
If Option B only applies when Option A is accepted, summing both as independent choices produces a scenario the owner did not request. Put the dependency in its own field and test only valid combinations. AACE International's Basis of Estimate guidance says the record should state project scope, pricing basis, allowances, assumptions, exclusions, risks and opportunities, and the documents used to prepare the estimate.
Apply that discipline to the alternate register. The AACE International recommended practice supports documentation practice; it does not decide how a particular contract treats an option.
Review checks before final use
Trace each material alternate from the bid-form line to its register entry, then into the removed base cost, added scope, supporting quote, and markup treatment. Close any break in that path before release because a reviewer must be able to reproduce the option amount without guessing which base work was credited. Compare the register labels, numbering, and document revisions with the latest bid form and addenda.
When the estimate describes a different option or carries an exclusion that changes the requested scope, state the difference beside that alternate so the contractor can include it, qualify it, or correct the estimate. Test valid alternate combinations against project conditions instead of reviewing each option in isolation. Access, phasing, working hours, existing conditions, supervision, site logistics, and procurement timing may change the labor or indirect-cost delta.
Record those effects on the dependent option rather than hiding them in the base bid. Ask a reviewer who did not build the register to reconstruct the base credit, added cost, markups, dependencies, and final bid-form amount. The package is ready only when that person can identify the open questions and prior decisions from the record itself, without relying on the estimator's memory.
| Review area | What to check | Why it matters |
|---|---|---|
| Basis | Current documents and stated assumptions | Sets the comparison baseline |
| Scope | Inclusions, exclusions, and interfaces | Finds coverage gaps |
| Timing | Dates, duration, and validity | Exposes schedule effects |
| Adjustment | Difference and estimate treatment | Keeps totals explainable |
| Closeout | Owner, decision, and approval | Creates accountability |
Where remote estimating support fits
Remote estimating support can maintain the alternate register, attach source documents and quotes, enter removed and added quantities, and update permitted combination checks. A defined register structure keeps this production work consistent while the lead estimator concentrates on dependencies, markup treatment, and commercial judgment. Support staff can prepare the comparison evidence and flag a missing base credit, conflicting document, or unpriced dependency.
The contractor keeps final responsibility for alternate scope, pricing strategy, markup, qualifications, valid combinations, and the amounts submitted on the bid form. This division is useful when bid volume rises or internal estimators are pulled into meetings and field coordination.
The allowance versus contingency guide shows the nearest review handoff in this batch. Teams can assign repeatable work to support staff and reserve senior attention for decisions that can change the result.
