Cost Plus Budget Revisions for Custom Home Builders: Preserve the Original Baseline

A Cost Plus budget revision changes the current plan without erasing where the project started. Keep the original direct-cost baseline, the current direct-cost amount and the contract's fee rules separate. That makes it easier to explain a new bid or an approved scope change without confusing a budget adjustment with an incurred expense, an invoice or a payment.

Read Base Cost, Estimated and Revised correctly

In Foundation's Cost Plus budget, Original Base Cost is the original direct-cost baseline. The Base Cost column uses that original amount. Estimated, shown as Est. Total, is original direct cost plus markup; Revised is current direct cost plus markup. Both totals use the category's current markup percentage. Original Markup (current %) therefore does not mean a frozen historical fee percentage or an archived contract price.

Changes, described in the summary as Changes (incl. markup), is Revised minus Estimated. It includes manual direct-cost revisions, approved change-order deltas and their markup difference. Current direct cost already includes those revisions: do not add the approved-revision amount a second time. If the percentage itself changes, both displayed totals recalculate at the current percentage. Use retained contract documents when you need evidence of earlier fee terms.

Edit the full new direct-cost amount, not the delta

Open the category edit dialog and use Estimated Amount (USD, before markup). Enter the new full direct-cost amount. Foundation calculates the difference from the previous current amount, records a manual revision when that amount changes and preserves the original baseline. Amounts must be nonnegative and entered in exact cents. A group-only actual-cost target is retained as history, not a priced estimate row to revise.

1. Confirm the category, scope and current amount before editing.
2. Check whether an approved change order already accounts for the intended increase.
3. Enter the full revised direct cost before markup.
4. Keep a clear reason with the supporting quote or project record.
5. After saving, compare Original Base Cost, Changes and Revised rather than assuming the baseline was replaced.

A manual revision is recorded with approved status in the budget revision ledger. That is an internal budget record, not a new homeowner signature approving extra scope. If the contract requires authorization for a scope or fee change, use the change-order approval process instead of treating an estimate edit as that approval. A more accurate forecast alone does not establish that money is owed.

A hypothetical revision worked example

Suppose a category's original and current direct cost are both $20,000, with an assumed 10% current markup. Estimated is $22,000: $20,000 plus $2,000 markup. A revised bid raises the full direct-cost plan to $24,000. Enter $24,000, not the $4,000 increase. Foundation records a $4,000 manual revision while Original Base Cost remains $20,000.

At the unchanged 10% markup, Revised becomes $26,400, including $2,400 markup. Changes is $4,400, not just $4,000, because the displayed totals include the $400 markup difference. These invented numbers demonstrate display behavior; they are not recommended markup terms, local costs or a customer case study.

Approve scope changes without counting them twice

Now suppose a separate approved Cost Plus change order adds $3,000 of direct cost to the same mapped category. Its direct-cost revision increases the current amount from $24,000 to $27,000. Original Base Cost stays $20,000. At the assumed current 10%, Revised is $29,700 and total Changes is $7,700 compared with Estimated of $22,000. Do not manually add that same $3,000 again after approval.

For Cost Plus change orders, budget revisions use direct cost rather than the fee-inclusive client amount. Keep builder compensation under the applicable fee policy. A fixed builder fee may be handled separately according to its billing timing; it should not also be embedded in direct costs or charged again as a percentage fee for the same compensation. An approved authorization is not itself an incurred cost. Actual work is documented and billed later through the Cost Plus draw process, subject to the agreed terms.

Separate organization changes from price changes

Moving an item between groups or correcting a group label changes organization, not price. If the amount does not change, it should not be described as a cost increase. Likewise, a group-only actual cost remains one source amount rather than being spread across priced items. Review actual spending separately: a revised budget does not manufacture an expense, and a payment does not rewrite the original estimate.

Use the group-first budget template guide to set up understandable scope, then explore Foundation's Cost Plus workflow for connected costs, fees, approvals and draws. The product walkthrough can help your team evaluate how those distinctions fit its existing contract and accounting process.