How Do Jumbo Construction Loans Work for a Custom Home?

The short answer

How does a jumbo construction loan work? It finances a custom home build when your loan amount is above the conforming limits, which vary by county. Mechanically, it works a lot like other construction loans: your builder is paid in stages as the work is inspected, and the loan becomes a permanent mortgage when the home is done. The difference is scrutiny. Lenders usually look harder at your credit, your cash reserves, your builder, and the appraisal. In the next few minutes, we'll walk through each of those. This is general education, not loan advice, and requirements vary by lender.

What makes a construction loan "jumbo"?

So what makes a loan jumbo? Each year, the Federal Housing Finance Agency sets conforming loan limits. Loans at or under the limit can be sold to Fannie Mae or Freddie Mac. Loans above it can't, so they're called jumbo, or non-conforming. The limit varies by county, and it's higher in many high-cost areas, so the same project might be jumbo in one county and conforming in the next. Because the lender usually keeps a jumbo loan or sells it to a private investor, each lender writes its own rules. That's why jumbo guidelines can vary so much from one lender to another.

How is a jumbo construction loan structured?

Jumbo construction loans come in two main structures. With a one-time close, you're approved once, you close before the build, and the loan converts to a permanent jumbo mortgage when the home is finished. With a two-time close, you take a separate construction loan first, and then refinance into a permanent mortgage at the end, which means a second approval and a second closing. Either way, the build runs on draws. Instead of paying your builder up front, the lender releases funds at milestones, like the foundation, framing, and finishes, after an inspector confirms the work. Ask each lender which structure they offer and how payments work during the build.

What do jumbo lenders look for in you?

Now, what lenders look for in you. Expect a deeper review than on a typical loan. Lenders usually want a strong credit history, steady and well-documented income, and a manageable level of existing debt. Self-employed borrowers and business owners should plan on providing more documentation, like business returns. And reserves matter a lot. Reserves are the cash or liquid assets you'll still have after closing. On a large custom build, lenders want to know you can handle surprises without the project stalling. A low down payment option for eligible borrowers may exist with some lenders, and some specialty programs, like physician loans, have their own guidelines, but every lender sets its own requirements.

What do they look for in your builder and plans?

Lenders also look hard at your builder. Custom homes often involve complex designs, premium materials, and longer schedules, so lenders want a builder with a track record on homes of similar size and quality. Expect checks on license, insurance, references, and sometimes the builder's financial strength. You'll need a signed contract, complete plans and specifications, and an itemized budget with very few loose allowances. On a high-end build, a line like "kitchen, to be determined" can hold up approval, because the lender and appraiser need to know what's actually being built. Introduce your builder to your lender early.

Why is the appraisal harder on a custom home?

The appraisal is where many jumbo builds hit a snag. Since the home doesn't exist yet, the appraiser estimates its value when finished, using your plans, specs, and recent sales of similar homes nearby. With a unique custom home, there may not be many comparable sales, and some features you value highly may not add as much appraised value. Some lenders require two appraisals on larger loans. If the value comes in below your total project cost, you may need to bring more cash, adjust the design, or rework the budget. Realistic pricing and good comparables make a big difference.

How do you protect your budget?

Next, protecting your budget. Custom builds are especially prone to overruns, because there are more choices and more chances to upgrade. Many lenders require a contingency reserve, which is a cushion for surprises, and it's smart to plan for one even if yours doesn't. Keep change orders to a minimum, and get any change priced and approved in writing before work starts. Review each draw request so you know what's been paid and what's left. If costs do go over, you'll usually need to cover the gap yourself, so a clear plan up front matters.

Questions to ask a lender

When you talk with a lender, ask a few direct questions. Do you offer jumbo construction loans where I'm building? Is it a one-time or two-time close? What do you need from me on reserves and documentation? What do you need from my builder? How do you handle the appraisal on a custom home, and is a second appraisal required? And how do payments work during construction? Their answers will show you quickly whether they're set up for a project like yours.

Talk with a lender

If you'd like to talk with a lender that handles custom home construction, we'll connect you with lenders who work with builds like yours. Visit myconstructionpath.com/match. Check the description for our articles on jumbo construction loans, construction appraisals, and handling cost overruns. My Construction Path is not a lender and does not make loans or credit decisions. We connect you with lenders who may be able to help. Not all borrowers will qualify. Equal Housing Opportunity. Thanks for watching, and good luck with your build.