What makes a construction loan "jumbo"?
A jumbo loan is financing above the conforming loan limit that applies to the county where the property is located. Those limits are set annually and vary by county, so the threshold in a high-cost coastal Florida county can differ from an inland one. When a construction project pushes the financing above that limit, it is generally underwritten under jumbo guidelines rather than conforming ones, and specific limits and terms are set by the lender and program.
In Florida this comes up frequently: waterfront rebuilds, elevated coastal homes, large custom builds on acreage, and high-specification homes in markets such as Naples, Sarasota, Palm Beach, Miami and the barrier islands.
How jumbo construction underwriting differs
- Credit and income review is often deeper. Lenders typically expect thorough documentation of income sources, particularly for self-employed borrowers and those with business or investment income; exact requirements vary by lender.
- Reserves often carry more weight. Lenders generally want to see liquidity that can absorb cost overruns or a delayed completion without stalling the project, though the amount required varies by program.
- Equity expectations are typically higher. Jumbo programs generally call for a larger borrower contribution than conforming programs, subject to the specific lender's guidelines.
- Appraisal scrutiny often increases. Two appraisals or a secondary review are common at higher loan amounts, depending on the lender.
- Builder review is often more rigorous. Track record on comparable high-value projects, financial capacity and references can all matter more at this loan size.
The appraisal question on high-value Florida homes
The as-completed appraisal remains the anchor of the transaction, and at the high end it can be harder to support. Unique waterfront parcels, one-of-a-kind architecture and specification levels well above the neighborhood can all produce a value that lands below cost. That is not necessarily a reason to compromise the home you want, but it is a reason to understand early how the completed property is likely to appraise — and to plan the equity contribution accordingly.
Coastal and elevated construction
Many high-value Florida builds are in flood zones or coastal high-hazard areas. Elevated foundations, impact-rated openings, enhanced wind design and elevation certificates can all affect cost and timeline. From a financing standpoint the recurring themes are insurability — including whether windstorm and flood coverage are available and affordable for the property — whether the budget honestly reflects coastal construction costs, and whether county permitting timelines fit within the construction term.
Draw management on larger projects
Bigger budgets generally mean more draws, more construction inspections and more coordination between the borrower, builder and lender. Custom homes also tend to see more change orders, and each one can affect the budget, the schedule and sometimes the appraisal. Establishing a clear process for handling changes at the outset, and keeping builder documentation current, can prevent a great deal of friction later.
One closing or two?
Jumbo construction financing can be available in both one-time close and two-close forms depending on the lender, and the trade-offs are similar to those at any loan size — closing costs, rate certainty and flexibility at completion — but the dollar consequences are larger. Compare one-time close and two-close structures. This applies whether you are acquiring land or building on land you already own.
Getting started
For a jumbo construction project, the earlier the financing conversation happens, the better. Reviewing the construction loan requirements and the step-by-step process will tell you generally what to assemble, our guide to how construction loans work in Florida covers the basics, and you can contact The Built Mortgage Team to discuss the specific project. All programs are subject to credit approval, appraisal, property eligibility and applicable lender guidelines, and availability may vary based on borrower qualifications, property type, builder and project details.