The most useful question is how much it now costs to finish and which funds can actually be used for that work. An overrun can begin as a manageable change and become a completion problem if nobody updates that calculation.
Separate the cause from the responsibility
A price increase can reflect an owner upgrade, an allowance that was too small, missing site work, an unforeseen condition, a builder error or another contract event. Those situations do not necessarily place responsibility on the same party.
Read the signed contract and have the appropriate adviser explain it. A fixed price can allocate some cost risk to the builder while still allowing certain changes or exclusions. A cost plus agreement can allocate costs differently. The title fixed price is not enough to determine who pays a specific invoice.
The borrower also needs a financing answer even while responsibility is disputed. Money that may eventually be recovered from another party is different from cash available to keep required work moving today. Coordinate with the builder, lender and counsel instead of assuming the dispute will resolve itself before the next draw.
Contingency belongs in a controlled budget
Identify the approved contingency amount, its source, what it can cover and who authorizes its release. Ask whether it is inside the lender commitment, borrower cash or a separate requirement.
A remaining contingency should not be confused with unused funds in another line item. A lender may restrict reallocations or require a new cost to complete review. Money reserved for interest or retainage may serve a different purpose and may not be available for a finish upgrade.
My preference is to keep optional upgrades outside the contingency needed for required work. A buyer may be able to afford a better kitchen initially and still need that same cash when the site or schedule creates an unexpected cost.
For the disbursement process, use the construction draw guide. For the full initial budget, start with the construction financing hub.
A change order sequence before work starts
| Step | ** What to document** | ** Funding decision** |
|---|---|---|
| Describe the change | Scope, reason, drawings and affected work | Is this required or optional? |
| Price it | Labor, materials, fees, credits and delay costs | What is the net cost rather than the headline addition? |
| Check approvals | Builder, borrower, lender and permit or design review as applicable | Does the accepted project need updating? |
| Identify money | Contingency, approved reallocation, new cash or loan modification | Is the source available when payment is due? |
| Authorize | Signed change and revised schedule under the contract | Who can commit the parties? |
| Update records | Budget, draws, cost to finish and permanent financing assumptions | Does the project still work through completion? |
Verbal instructions can create a mismatch between what is built, what is invoiced and what the lender approved. Use one current version of the scope and budget so everyone is working from the same facts.
An overrun calculation that exposes the gap
Assume a hypothetical original project budget of $600,000, funded by a $480,000 loan and $120,000 borrower investment. The original budget includes contingency.
At the review date, $360,000 has been paid, using $280,000 of loan advances and $80,000 of borrower funds. That leaves $200,000 undisbursed on the loan and $40,000 of the originally committed borrower cash.
The revised costs still due are:
| Remaining cost | ** Illustrative amount** |
|---|---|
| Remaining base work | $210,000 |
| Approved changes not yet paid | $35,000 |
| Additional carrying costs | $8,000 |
| Other remaining project costs | $7,000 |
| Total remaining need | $260,000 |
| Remaining loan and original borrower funds | $240,000 |
| Unfunded difference | $20,000 |
The forecast total is now $620,000: $360,000 paid plus $260,000 remaining. If the changes include a fully removable $25,000 optional upgrade with no cancellation cost in this example, eliminating it would reduce remaining needs to $235,000 and leave a $5,000 cushion. In practice, verify what can actually be canceled and whether other costs or value change.
This is a cash forecast, not a promise of lender funding. Confirm that the $200,000 undisbursed amount remains usable for the identified costs and conditions.
Can the lender increase the loan
Ask before relying on an increase. More debt can require acceptable value, borrower qualification, program eligibility, credit approval and updated loan or title documentation.
Fannie Mae's single closing guidance permits certain loan amount modifications for documented increased construction costs, subject to its conditions. It also addresses underwriting and title requirements when terms change. [1] That creates a possible program path; it does not obligate a construction lender to approve more money.
Even when a proposed increase fits an LTV calculation, the lender can have other restrictions. Explain the cause, provide the revised budget and ask what decision and documents are required. Do not authorize an unaffordable change on the expectation that a higher appraisal will finance it later.
Additional cash may solve the budget without solving everything
If you can bring more cash, ask how it must be documented and contributed. The lender may still need to approve revised plans, contract amounts, permits or the project budget. Paying outside the loan does not make a material scope change irrelevant to its collateral.
Also consider where that cash comes from. Using money intended for permanent closing, household carry or required reserves can move the shortfall to a later stage. Borrowing it elsewhere can add a payment or lien that affects qualification or title.
Make the full sources and uses schedule work through completion and permanent financing. The right cash cure leaves enough for the remaining obligations, rather than just satisfying the next contractor invoice.
Optional finishes and necessary work need different decisions
For an optional upgrade, compare net cost, financing approval, value effect and the remaining cushion. If the upgrade is already ordered, establish cancellation terms before counting it as a saving.
For necessary site, structural or code work, establish the scope with qualified professionals and determine what must happen for the project to continue legally and safely. Required work may force a revised budget rather than a simple finish reduction.
If a change affects layout, living area, quality or site improvements, ask whether the appraisal needs review. A dollar spent does not guarantee an equal value increase, and a dollar saved can have a different effect on value. See the construction appraisal guide before using value assumptions to solve the funding gap.
Track time as part of the change cost
A change order can add days or weeks as well as a price. Ask about permitting, material lead time, sequencing, inspections and work already completed that must be redone.
Add the resulting construction interest, site carry, rate lock or extension costs and ongoing housing expense where applicable. If the permanent mortgage needs updated documents or a different closing date, include that process in the schedule.
Use the construction interest and carrying cost guide to keep those amounts separate from the contractor's price. A change that appears fully funded on the construction line can still exhaust the household or interest budget.
Warning signs that completion is threatened
The most obvious warning is remaining cost exceeding usable funds. Others include unpaid invoices accumulating, subcontractors asking about payment, contingency being used without updates, and repeated draw requests based on an old budget.
A dispute about work or payment also needs early attention. Florida DBPR's construction lien information explains why owners should coordinate payments and relevant notices or releases with appropriate professionals. [2] A loan draw does not settle a contractual dispute or establish that every potential lien issue has been resolved.
If completion is at risk, obtain a current work and payment status, an independent or lender required cost review where appropriate, and a documented funding and schedule decision. Talk with counsel before assuming a work stoppage, builder replacement or payment action will preserve the project and your rights.
Problems and possible cures
| Problem | ** First response** | ** Possible funding or scope outcome** |
|---|---|---|
| Allowance is too low | Price the actual selection and contract treatment | Add cash or choose an approved alternative |
| Required site work was omitted | Obtain scope and estimates | Revised budget and committed completion funds |
| Optional upgrade consumes contingency | Review cancellation and original scope | Remove or separately fund the upgrade |
| Lender rejects a reallocation | Identify the restricted funds and reason | Another approved source or scope revision |
| Delay increases carry | Update the schedule and extension terms | Additional liquidity or a revised timeline |
| Parties dispute responsibility | Reconcile contract and evidence with counsel | A documented resolution rather than an assumed reimbursement |
Documents to assemble before approving a change
Original approved budget, signed contract, plans and specifications.
Current amounts paid, loan draws, unpaid invoices and remaining commitments.
Written change order with scope, price, credits and schedule effects.
Contractor or professional support for necessary work and required approvals.
Updated contingency and cost to finish with usable funding sources identified.
Lender approval or requirements for review, appraisal, title and loan changes.
Evidence of additional borrower funds and the postchange reserve and housing budget.
Keep payment evidence and the final approved version with the draw file. Completion must ultimately match the applicable financing requirements; Fannie Mae's completion guidance addresses verification against the proposed project and its changes. [3]
Questions about construction overruns
Does a fixed price contract mean the builder pays every increase
The contract controls the allocation of a particular cost, including changes and exclusions. Have the relevant terms reviewed. Separately determine how the immediate funding gap will be addressed while responsibility is resolved.
Can I pay for an upgrade without involving the lender
Ask first. Cash paid outside the loan can still change approved collateral, plans or completion requirements. Document the cost and obtain required approvals.
Is unused loan money automatically my contingency
No. Determine what each unadvanced amount is reserved for and whether the lender permits the proposed use. An approved commitment and unrestricted cash are different resources.
Rebuild the cost to finish before signing the change
Bring the original budget, current draw statement and written change proposal. Include what has been paid, what remains due and the cash still available. I would calculate the full completion gap, including delay costs, before deciding whether more borrowing, added equity or a revised scope is the realistic solution.
Sources
- Fannie Mae B5 3.1 02 Single Closing Construction Transactions, Modifications and Underwriting sections. Reviewed October 17, 2026.
- Florida DBPR Construction Lien Law Guide, payment and lien considerations. Reviewed October 17, 2026. Contract responsibility and remedies require transaction specific advice.
- Fannie Mae B4 1.2 05 Completion and Postponed Improvements, completion evidence and change documentation. Reviewed October 17, 2026. All budget examples are hypothetical.