How Renovation Costs Are Calculated
Your HomeStyle renovation loan amount gets determined by adding up several components. The foundation is your contractor's detailed bids for all the work you want done. These bids must align with your renovation plans and specifications.
Say you want to renovate a kitchen and add a bathroom. Your contractor provides a bid of $45,000 for the kitchen work and $25,000 for the bathroom addition. Your lender will use these $70,000 in total contractor costs as the base for calculating your loan amount.
The renovation costs can also include related expenses like permits, architectural plans, inspection fees, and other renovation-specific costs. If your architect charges $3,000 for plans and the city requires $1,200 in permits, these get added to your total renovation costs.
Understanding the Contingency Reserve
The contingency reserve acts as a safety net for unexpected issues that surface during renovation. Think of it as insurance against cost overruns when contractors discover problems behind walls or under floors.
For single-family homes, the contingency reserve is optional. Your lender might recommend one, but Fannie Mae does not require it. For properties with 2-4 units, you must establish a contingency reserve equal to 10% of your total renovation costs. Your lender can increase this to 15% if they think your project scope warrants the higher reserve.
Using our earlier example of $70,000 in renovation costs for a duplex, you would need a $7,000 contingency reserve (10% of $70,000). This brings your total renovation funding to $77,000.
You can fund the contingency reserve in two ways. Either include it as part of your loan amount, or pay for it separately with your own cash. The reserve can only be used for necessary, unforeseen repairs discovered during the work.
What Happens to Unused Contingency Funds
If your renovation goes smoothly and you do not need the full contingency reserve, the leftover money has specific rules. Any unused funds that came from the loan proceeds must be applied to reduce your outstanding loan balance after the work is complete.
However, you can use remaining contingency funds for additional improvements under certain conditions. Your lender must verify that all originally planned work was completed first. They must also ensure the additional improvements actually benefit the property and that you document the work with paid receipts.
The appraiser who prepared your "as completed" appraisal must inspect any additional work done with leftover contingency funds. This ensures the improvements meet Fannie Mae standards.
Escrowing Your Mortgage Payments
If your renovation makes the property uninhabitable, you can include up to six mortgage payments in your renovation loan amount. This only applies to your primary residence when you cannot live there during construction.
Say your renovation will take four months and you need to rent an apartment during that time. Your monthly mortgage payment is $2,400 (principal, interest, taxes, insurance, and association fees). You can include $9,600 (4 payments × $2,400) in your renovation loan to cover these payments.
Your lender holds these mortgage payment funds in the renovation escrow account and applies them to your regular mortgage payments as they come due. Some lenders prefer to set up a separate escrow account just for mortgage payments instead of mixing them with renovation funds.
How the Renovation Escrow Account Works
All renovation money gets deposited into a special escrow account that your lender controls. This includes the loan proceeds, your contingency reserve, any escrowed mortgage payments, and money you contribute from your own funds.
Your lender acts as the gatekeeper for these funds. They release money only when specific work gets completed and only after receiving a formal request. This protects you from paying contractors before work is done and ensures the project stays on track.
The lender can release up to 50% of your total renovation costs at closing as an initial draw. This initial funding can pay for permits, architect fees, and other upfront costs. If you paid for any eligible renovation expenses with your own money before closing, the initial draw can reimburse you.
Your lender must conduct periodic inspections before releasing additional funds. These inspections verify that work is progressing according to your plans and specifications.
What Documents You Need to Prepare
Your lender will require detailed renovation plans and specifications prepared by a qualified professional. These documents must clearly describe all work to be performed, materials to be used, and timeline for completion.
You need written bids from licensed contractors for all renovation work. The bids must be detailed and align with your plans and specifications. Generic estimates will not satisfy underwriting requirements.
If you plan to use the contingency reserve for additional improvements, you must provide paid receipts documenting the work. The receipts must show the work was completed and paid for with your own funds, not loan proceeds.
Why These Rules Exist
Fannie Mae requires detailed cost documentation because renovation loans carry higher risk than standard mortgages. The property serves as collateral, but its value depends on completing the planned improvements. Without proper cost controls, borrowers might run out of money before finishing the work.
The contingency reserve requirement for multi-unit properties reflects their complexity. Older buildings often hide structural issues, outdated electrical systems, or plumbing problems that only surface during renovation. The reserve ensures you can address these issues without stopping work.
The escrow account protects both you and the lender. It prevents contractors from demanding payment before completing work and ensures renovation funds get used for their intended purpose rather than other expenses.
Common Complications to Watch For
Cost overruns present the biggest challenge with renovation loans. If your project costs exceed the original estimates, you or your lender must fund the difference. Fannie Mae prohibits increasing the loan amount to cover overruns, so have backup funding ready.
Delays can create problems if you have escrowed mortgage payments. If your renovation takes longer than expected, you might exhaust your escrowed payments before the work is complete. Plan conservatively when estimating your timeline.
Contractor issues can derail your project. If your contractor abandons the job or performs substandard work, you still owe the full loan amount. Choose contractors carefully and verify their licensing, insurance, and references before signing contracts.
Change orders during construction can complicate fund releases. If you decide to upgrade materials or add work not in your original plans, document these changes properly and ensure your lender approves them before proceeding.
References
For the official guidelines, see B5-3.2-04: HomeStyle Renovation Mortgages: Costs and Escrow Accounts in the Fannie Mae Selling Guide.
Mortgage guidelines change. Stay current.
Fannie Mae and Freddie Mac update their rules several times a year. Get notified when changes affect your mortgage eligibility, required documents, or loan terms.
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Original Fannie Mae Guideline Text
B5-3.2-04, HomeStyle Renovation Mortgages: Costs and Escrow Accounts (12/10/2025)
Costs and Escrow Accounts
The costs of the renovations will be based on the plans and specifications for the work and on the contractor’s bids for all of the work requested by the borrower. The renovation costs may include a contingency reserve, renovation-related costs, and an escrow for mortgage payments that come due during the renovation period, if the borrower is unable to occupy the property during the renovation.
Contingency Reserve
The contingency reserve should cover all renovation-related costs including labor, materials, fees, permits, plans and specifications, inspection costs, and other expenses related to the renovation.
A contingency reserve is not required for a mortgage secured by a one-unit property, however the lender may choose to establish one. A contingency reserve equal to 10% of the total costs of the repairs and renovation work must be established and funded for a mortgage that is secured by a two- to four-unit property to cover required unforeseen repairs or deficiencies that are discovered during the renovation. The lender may increase the contingency reserve to 15% if it determines the higher reserve is appropriate given the scope and scale of the renovation.
The contingency reserve may be considered as part of the total renovation costs or the borrower may fund it separately. It may be released only if required, necessary, and unforeseen repairs or deficiencies are discovered during the renovation. Unused contingency funds, unless they were received directly from the borrower, must be used to reduce the outstanding balance of the renovation loan after all of the renovation work has been completed and the certification of completion has been obtained.
However, a borrower may use the remaining contingency reserve funds for making additional improvements or repairs to the property, if the lender:
warrants that the work scheduled and described in the plans and specifications was completed and the contingency reserve funds have already been reduced by any cost overruns; and
ensures that
the contingency reserve funds that are to be used for additional improvements or repairs are actually used to improve the real property,
the improvements or repairs are documented with paid receipts from the borrower’s own funds, and
inspections of the additional work or installations are completed by the appraiser who prepared the “as completed” value appraisal report.
Escrowing Initial Mortgage Payments
At the borrower’s request, up to six mortgage payments (PITIA) that will become due during the renovation period may be included as part of the total renovation costs for a principal residence property if the property cannot be occupied during the renovation period. The lender, servicer, or its agent must hold the funds in a renovation escrow account, and only apply them to payments that come due during the period in which the property cannot be occupied.
Note: The lender may set up a separate escrow account for the mortgage payments in lieu of including the funds in the renovation escrow account.
Renovation Escrow Account
The renovation costs (less any draws made at closing), the contingency reserve, mortgage payments (if applicable), and monies that the borrower provides from their own funds, must be deposited into an escrow account for the benefit of the borrower. The renovation escrow account must meet the requirements shown in the following table at the time of delivery to Fannie Mae.
✓
Renovation Escrow Account Requirements
The account must meet the requirements of and be administered in accordance with the requirements in the Servicing Guide, D1-2-01, Renovation Mortgage Loans.
The funds must be used to complete the repair and renovation work and, if applicable, make any mortgage payments that come due during the renovation period.
The lender, or its agent, is responsible for administering this account and ensuring the repairs and renovations are completed in a timely manner and in accordance with the plans, specifications, and contractor estimated bids.
The lender must release funds from this account only when any given renovation work has been completed, and then only in accordance with the agreed-upon schedule and after receipt of a specific request.
After renovations are complete, all funds remaining in this account, including any mortgage payment reserves, may be used to either:
Note: The lender may fund up to 50% of the total planned renovation costs at closing with an initial draw. A portion of this initial draw may be used to pay for permits, architect fees, and other eligible renovation-related costs (see
B5-3.2-02, HomeStyle Renovation Mortgages: Loan and Borrower Eligibilityfor additional information on renovation-related costs). Borrower deposits may also be reimbursed from the draw if the funds were used for renovation-related costs and were intended to be financed through the renovation loan. The lender must obtain periodic inspections to confirm the work is being completed as planned prior to the issuance of additional escrow draws.
Should there be an increase in costs during the renovation period, the borrower, or the lender, must fund the amount of the increase. The lender may not increase the loan amount to offset any increase in costs. The lender must ensure that the additional funds are obtained in a manner that will not affect the priority of Fannie Mae’s lien.
