SBA 504 Construction Loan Guide: Structure, Timing, and Costs

The short answer

An SBA 504 construction loan can fund ground-up construction or a major owner-occupied expansion, but the deal that actually closes usually looks like this: a bank funds the first lien, a CDC funds the SBA-backed second lien, and you bring 10% to 20% equity depending on the borrower and property. The SBA piece usually does not show up at the first closing. The bank carries interim financing until the project is complete and the SBA debenture is sold.

What SBA 504 construction actually covers

The official SBA 504 program page says the program can be used to purchase land, build new facilities, improve existing facilities, and finance long-term machinery and equipment. The key phrase is fixed assets. This is not a working-capital line and it is not a speculative development loan.

For a construction borrower, that usually means one of these fits:

• Ground-up construction of a building your business will occupy
• A major addition that increases square footage or production capacity
• Heavy renovation or reconstruction of an owner-user property
• Land acquisition plus site work plus vertical construction in one project budget

It is a poor fit if you are building to rent out the whole property, hoping to flip the completed building, or need a pile of working capital next to the real estate budget. SBA rules also bar passive businesses and speculative businesses, which is why raw developer logic does not map cleanly onto 504. If you need financing for a stabilized investment property instead, you are usually comparing commercial mortgage, construction loans, or bridge debt rather than 504.

If you want the broader borrower-side mechanics first, read the commercial construction loans guide. It covers draw administration, contingency expectations, interest carry, and why plain bank construction debt behaves differently from SBA and HUD structures.

The bank, CDC, and equity stack

The part borrowers usually miss is that SBA 504 construction is a two-loan structure, not one all-in mortgage. In the standard setup, the bank sits in first position at 50% of project cost, the CDC and SBA-backed debenture cover up to 40%, and you bring at least 10% equity.

13 CFR 120.910 is the cleanest source for the equity rule. It sets borrower contribution at 10% in standard cases, 15% if the business has operated for two years or less, 15% for limited or single-purpose properties, and 20% if both are true. That matters a lot in construction, because special-use properties such as hotels or car washes can push your cash requirement higher than the headline 10% you see in SBA marketing.

The owner-occupancy rules that matter

This is where deals live or die. Under 13 CFR 120.131, a borrower buying, renovating, or reconstructing an existing building must occupy at least 51% of the rentable space. For new construction under 13 CFR 120.870, the borrower must immediately occupy at least 60% of the rentable space, can lease long term up to 20%, and must plan to grow into the remaining space over time.

That has three practical consequences:

1. If your business only needs 30% of the building today, SBA 504 is probably dead on arrival.
2. If you want a project that mixes owner-user space with a reasonable future growth cushion, 504 can work well.
3. If you are acting like a landlord first and an operating business second, 504 is the wrong box.

This is also why 504 works best for manufacturers, medical practices, distributors, owner-occupied industrial users, and similar operators with a real business case for the building. If your use case looks more like flexible real estate ownership plus some incidental occupancy, you are usually better off looking at SBA 7(a) or a plain commercial mortgage.

What costs can be financed, and what still needs cash

13 CFR 120.882 is the core rule here. It allows 504 proceeds to cover land tied to the project, contingency reserves up to 10% of construction cost, professional fees that are directly attributable and essential to the project, and repayment of interim financing including points, fees, and interest.

In plain English, the financeable bucket often includes:

• Land acquisition already tied to the project
• Site work such as grading, utilities, parking, and landscaping
• Building construction and core improvements
• Architecture, engineering, appraisal, environmental, title, zoning, and permit-related costs
• Interim financing carry, including points, fees, and interest

What it does not solve is every budget hole. Working capital, inventory, and speculative costs are out. Cost overruns above the allowed contingency still need another source. And if your GC budget is too thin or your soft-cost schedule keeps moving, the bank will care long before the CDC gets comfortable.

Timing from bank commitment through debenture funding

SBA 504 construction closes in stages. A CDC explainer from Alloy Development Co. describes the common sequence: bank and CDC underwriting, SBA authorization, interim bank funding during project execution, then final CDC closing and SBA debenture funding after completion. Some CDCs quote roughly 30 to 90 days from application to initial approval, with the SBA takeout often funding weeks after completion on the program's monthly debenture cycle, but timing varies by lender, CDC, and project.

Worked example: owner-occupied industrial project

Say a metal fabrication company is building a 24,000 square foot facility with total project costs of $4.2 million. The company will occupy 16,000 square feet on day one, which is about 67% of the building, and keep the remaining space for planned growth. That fits the new-construction occupancy rule much better than a borrower planning to occupy only half.

The project budget might include land, grading, utilities, shell construction, MEP work, architecture, engineering, environmental, and interim interest. It still lives or dies on whether the contractor budget is credible, the contingency is real, and the sponsor has enough post-close liquidity to survive a few ugly surprises. That is the part founders always want to round down. Lenders do not.

When 7(a) is the better fit

SBA 504 is great when the real estate is the point. If the project needs a more flexible box, SBA 7(a) vs. 504 is the comparison you should read next.

7(a) is usually the better fit when:

• You need working capital, inventory, or business acquisition dollars alongside the real estate
• You need one lender and one closing, not a bank plus CDC structure
• Your occupancy plan does not cleanly meet 504 rules
• The project is small enough that 504 complexity is not worth the savings
• You need more flexibility on use of proceeds than fixed-asset rules allow

That does not make 7(a) cheaper. It usually is not. It just means flexibility can beat pricing when the deal does not fit neatly inside 504 construction rules.

Common deal killers

Common reasons SBA 504 construction deals stall are weak owner-occupancy fit, unrealistic contractor budgets, thin contingency, and sponsor liquidity that disappears after the down payment.

FAQs

Can an SBA 504 loan be used for ground-up construction?

Yes. SBA says 504 proceeds can be used to purchase land, build new facilities, and improve real estate when the property will be owner-occupied and the rest of the 504 structure fits. The catch is that speculative development and passive investment real estate are not eligible.

How much down payment do you need for an SBA 504 construction loan?

Most borrowers should expect 10% equity. That usually increases to 15% if the business has operated for two years or less, 15% if the project is a limited or single-purpose property, and 20% if both are true.

When does the SBA 504 money actually fund on a construction deal?

The bank usually carries interim financing during construction. The SBA-backed CDC piece typically funds after the project is complete and the debenture is sold, often on the monthly SBA funding cycle rather than at the first closing.

What kills an SBA 504 construction deal?

Common problems are owner-occupancy that does not fit the rule, speculative or passive real estate plans, weak contractor budgets, thin contingency, and sponsor liquidity that leaves no room for change orders or carry costs.