Construction Financing in Arizona: The Complete Guide

Financing a house that does not exist yet works nothing like buying one that already stands. There is no finished home for a lender to point at, only your plans, your lot, and your builder. So the money comes out in stages as the walls go up, and one loan is built to do exactly that: the construction-to-permanent loan. It funds the build in pieces called draws, charges interest only on the cash actually released, and then turns into a standard 15- or 30-year mortgage the day the home is finished. Everything else here circles that one product. You choose whether to close once or twice. An appraiser prices the home "as completed" straight from your plans. You may need a separate lot loan before any of it starts. The lender sets your credit and down-payment terms, and you carry specific insurance the whole time the frame sits exposed to weather and theft. Each section below gives you the short version and links to the deep page with the live Arizona numbers and rules.

The construction-to-permanent loan

Think of this loan as two loans wearing one hat. First it pays for the build, then it becomes your mortgage, so you handle the whole project with a single product instead of a short-term construction loan followed by a separate refinance. While the house is going up, it acts like a line of credit the lender feeds in draws. When the house is done, it flips to permanent financing with a locked rate and term. This is the go-to path for an Arizona custom home for one big reason: it spares you from having to re-qualify or re-appraise just to refinance a construction-only loan at the finish line, exactly when a delay or a rate jump would hurt most.

For the full mechanics, see Construction-to-permanent loan in Arizona . To learn what lenders require to approve one, read Construction loan requirements in Arizona . For how the two phases connect on the calendar, see How long does the construction phase of a loan last in Arizona? . The reference term is defined in the glossary under interest reserve , the cushion some loans use to cover interest during the build.

How draws and construction interest work

The lender does not hand you the whole loan on day one. It releases money in draws as each stage of work gets finished, and you pay interest only on what has been drawn so far, not the full loan amount, right up until the house is done. A typical schedule pays out at milestones you can picture: foundation, framing, dry-in, completion. Before each release, an inspector goes out to confirm the work is really there. Miss an inspection, come up short a lien waiver, or fall behind on paperwork, and the next draw stalls. That stall is the number one reason a build hits a cash crunch halfway through, when the crew wants paying and the money is still in the pipe.

The arithmetic is worth seeing once. Take a $1,000,000 build in Scottsdale with 20% down. The loan is $800,000, and at a 7.75% construction rate across a 12-month build the interest comes to roughly $31,000. That is not spread evenly. Because you only pay on what has been drawn, the first months cost very little and the final month runs about $5,167 on its own. So the cash you actually need at the start is the $200,000 down payment plus that build interest, about $231,000 before you make a single mortgage payment. That last figure is the one most buyers have not accounted for.

Figures assume a 12-month build at 7.75% during construction and 6.5% on a 30-year mortgage after it converts. Run your own numbers in the construction loan calculator, which uses the live 30-year rate, or open a worked example such as a $1 million home in Scottsdale with 20% down.

The as-completed appraisal

How much can you borrow for a house nobody has built? A lender answers with an as-completed appraisal. An appraiser reads your plans, specs, and finish selections and estimates what the finished home will be worth, then the lender lends against that future value, usually up to a set loan-to-value ratio. The wrinkle shows up when the appraisal lands below what the project actually costs. That shortfall is an appraisal gap, and it is on you to close, either by bringing more cash or by cutting scope until the numbers meet.

See how the valuation is done in How does the appraisal work on a custom home construction loan? , and how to handle a shortfall in What is an appraisal gap on a construction loan? . The glossary defines the as-completed appraisal .

Single-close vs. two-close

This is the fork in the road early in the process: close once, or close twice. It changes your closing costs, your rate, and how many times you have to qualify. A single-close (one-time-close) loan wraps construction and the permanent mortgage into one transaction, so you close, lock your terms, and pay fees a single time. A two-close loan funds construction first, then brings you back to the table to refinance into the permanent mortgage. That second closing costs more in fees, but it lets you shop the permanent rate later, which can pay off if rates fall while the house is being built.

Compare the structures in Single-close vs. two-close construction loan in Arizona . For the version that bundles the land purchase into the same loan, see Land and construction loan in Arizona .

Lot loans and land loans

No land yet? Then the house loan is not your first stop. You often need a lot loan to buy the parcel first, and it behaves differently from a construction loan. Banks see raw land as shakier collateral, since there is nothing on it to sell if things go sideways, so a lot loan tends to want a bigger down payment, charge a higher rate, and run for a short term. Down the road, many buyers fold that land into a construction-to-permanent loan or reach for a single product that finances both at once.

Learn the differences in What is a lot loan or land loan, and how is it different from a construction loan in Arizona? , and the combined option in Land and construction loan in Arizona . The buying steps themselves are covered in How do I buy land to build a house in Arizona? .

Credit, down payment, and land equity

Because the lender is betting on a house that is not there yet, it holds you to a higher bar than a regular mortgage does. Plan on a stronger minimum credit score and a bigger down payment than a plain purchase loan, with the exact cutoffs set by the lender and the loan program. Here is the good news for anyone who already owns their lot: that land's equity can often stand in for part of the down payment, and that can shrink the cash you have to bring to closing in a big way.

Down payments on our prerendered estimates run 20%, 25%, and 30%, which is the normal band for a construction-to-permanent loan on a custom home. Moving up that band cuts the monthly payment but raises the cash you need on day one. On the same $1,000,000 Scottsdale build: 20% down means $231,000 in cash and about $5,865 a month all in; 25% means $279,063 in cash and about $5,549 a month; 30% means $327,125 and about $5,233. Roughly $96,000 more cash up front buys you about $632 a month. Whether that trade is worth it depends on what else the cash is doing, which is a conversation worth having before you pick a program.

Owner-builder financing

Yes, you can act as your own general contractor in Arizona. It is just a steeper climb to finance. Lenders read an unlicensed builder as extra risk, and plenty will not touch an owner-builder project at all. The ones that will tend to ask for stronger credit, a larger down payment, and proof you can actually run the job, and they may release draws on a shorter leash. There is also a legal catch: Arizona's owner-builder exemption to contractor licensing puts real limits on selling the home afterward, and lenders weigh that before they say yes.

When the budget runs short

Costs creep, and sometimes a loan runs dry before the house is done. When that happens, the gap is yours to fill, because a lender will not just top up the account on request. Your first line of defense is a contingency reserve, money set aside at closing to soak up overruns and change orders. Once that runs out, your choices get thin: write a check, cut scope, or try to negotiate a loan modification, and all three are slower and more stressful than simply padding the contingency before you break ground.

Insurance the lender requires

A half-built house is a pile of expensive, exposed materials, and your lender knows it, so it requires coverage before and during the build. The main policy is builders risk insurance, which protects the structure and materials against fire, theft, wind, and other losses while the home is going up. On top of that, you carry homeowners coverage that takes over the moment the house is finished, and if the lot sits in a mapped flood zone, the lender can require flood insurance too. One detail is easy to fumble and costly to miss: pin down whether you or the builder buys the builders risk policy, so nobody assumes the other did and leaves a gap.

One Arizona detail that surprises buyers from other states: the property tax line is small, and it varies enough between towns to matter. On a $1,000,000 home the monthly tax runs about $225 in Carefree, $308 in Scottsdale, $383 in Phoenix, and $517 in Casa Grande. Same house, same loan, nearly $300 a month apart at the extremes. Compare Carefree against Casa Grande at the same price and down payment.

Risk on land and special property types

The land itself and the kind of home you plan to build come with their own risks, and the lender will look at both. That empty parcel you own while you plan may need liability or vacant-land coverage in the meantime, and once you close, title insurance guards your ownership against hidden claims someone might raise later. The home type matters too. Step outside the standard stick-built house, into a modular home or a rural property that trucks in its water, and your list of eligible loans can get shorter.

The takeaway

Strip it all down and financing an Arizona build rests on one core loan and a short list of smart choices around it. Pick a construction-to-permanent loan. Decide between single-close and two-close. Plan for the as-completed appraisal and set aside a real contingency. Sort out your lot loan and down payment early. Carry builders risk insurance from the first footing to the final walk. Get those right and the money side of your build stops being the part that keeps you up at night. Each section above links to a deep page with the live numbers and lender rules. For the full project around this money, see the master guide on how to build a custom home in Arizona , and if your lot is rural, the financing wrinkles continue in building a custom home on rural Arizona land .