Do You Need a Conventional Loan Pre-Approval for New Construction?

The Quick Read: No law or agency rule requires a pre-approval letter, but in practice you will want one, and a pre-approval alone is never enough. A builder may ask for proof of financing, and the lender still has to underwrite the actual construction-to-permanent loan before you close. Think of the pre-approval as a budget tool and a credibility signal. The real approval comes later, after the plans, the builder and the appraisal are reviewed.

Is a Pre-Approval Actually Required?

No agency requires one. Fannie Mae and Freddie Mac write rules for the loan itself, and neither one’s guide mentions a pre-approval letter. A letter is a document each lender chooses to issue, and the Consumer Financial Protection Bureau describes a preapproval as based on assumptions, not a guaranteed loan offer.

The question gets muddy because three different parties can ask for something:

Builders commonly want to see that a buyer is serious before holding a lot or starting plans. That is a business practice, not a published rule, so it varies from builder to builder. Some will not talk contract without a letter. Others will take a call from a lender instead.

Our view: skip the pre-approval only if you enjoy guessing. It tells you what you can spend before you pay for design work or put down a deposit, and it exposes credit or income problems while they are still cheap to fix.

Why a Pre-Approval Is Not Enough for a Build

A pre-approval on an existing home points toward a purchase contract and an appraisal of a finished house. New construction has no finished house. The lender has to underwrite plans, a budget, a builder and a timeline.

Across the wholesale programs Lendmire places files with, the pre-approval stage is the easy part. The file gets harder once the builder contract and plans arrive, because the lender is now judging three things: you, the builder and the project. A pre-approval that looked clean can pick up conditions at that point, such as explaining a large deposit or a new debt.

The appraisal works differently too. It is an “as completed” value based on plans and specifications, with a final update when the build is done. If the finished value comes in lower than expected, the loan may have to be re-run, which can change the leverage you qualify at.

Builder-Sold Homes vs. Custom Builds

The answer to “do I need it” shifts with the kind of build.

If a builder is selling a home that is finished or nearly finished, the financing looks much like buying any other home. A pre-approval helps you shop and shows you are serious. If you own a lot and are hiring a builder to construct something custom, the loan is a different product, and the lender will want the build documents before it commits.

What “Conventional” Means Here

A conventional loan is one that follows Fannie Mae or Freddie Mac guidelines and is not insured by a government agency. For new construction, conventional financing generally comes in two structures.

Single closing (one-time close). The construction financing and the permanent mortgage close together. When the build ends, the loan converts automatically. Fannie Mae’s single-closing guidance says the loan must be underwritten up front with its final terms in mind, and the construction phase is structured as a temporary loan. Freddie Mac’s One-Time Close rules work along the same lines. You pay for and attend one closing.

Two closings. The construction loan closes first, then a separate permanent loan closes near completion. Fannie Mae buys only the permanent loan, and the permanent lender can be a different company than the construction lender. The practical effect: you may qualify twice, once for each loan. That matters if your income or credit changes during a long build.

The rules for the underlying loan still apply. On a principal residence purchase, the conventional envelope across the wholesale programs we use runs to 97% loan-to-value when at least one borrower is a first-time buyer (no ownership interest in a residence in the previous three years) on a fixed rate, and 95% otherwise. Mortgage insurance applies above 80% LTV. You can request cancellation at 80% of the original value, and the servicer must end it automatically at 78%. Programs start at a 620 decision score, and the automated finding governs most files with a total ratio ceiling of 50%. All of this is subject to lender guidelines and full file review.

The mortgage side is covered in more depth on Lendmire’s conventional loan programs page.

What the Pre-Approval Review Covers

A pre-approval reviews you, not the project. Expect the lender to look at:

• Credit history and decision score
• Income and employment
• Assets for down payment and reserves
• Monthly debts against your income
• An automated underwriting finding

It is conditional. Final approval depends on the appraisal, title and full underwriting. Lenders differ on how long a letter stays valid, and some set their own shorter windows, so ask yours.

What it does not review is the builder, the plans or the budget. That comes next.

What Construction Adds to the File

Once you have a builder and a plan, the lender needs the project documents. Typical items include the plans and specifications, the construction budget, the builder contract and the build timeline. The lender also looks at the builder’s license, insurance and track record, since a builder who cannot finish puts the loan at risk.

Fannie Mae sets time limits on a single-closing loan: no single construction period over 12 months and no more than 18 months in total. A build expected to run longer has to be restructured as a two-closing loan, per Fannie Mae’s construction-to-permanent FAQs. Ask your builder for a realistic schedule before you pick a structure.

Funds go out in draws. The lender manages disbursement to the builder, and inspections confirm progress first. Money you have not drawn stays held back.

From Pre-Approval to Move-In: The Sequence

1. Get pre-approved. Learn your budget and show the builder you are serious.

2. Choose the lot and builder. Collect plans, specs, the budget and the contract.

3. Apply for the full loan. The lender underwrites the file with the build documents.

4. Appraisal on the plans. The value is “as completed.”

5. Close. One closing on a single-closing loan, or the first of two.

6. Build and draw. Inspections precede each disbursement.

7. Convert or close the permanent loan. The completion report, lien waivers and a certificate of occupancy support the final loan. All work must be complete and paid, and liens satisfied.

At conversion, some terms can be modified, including rate, loan amount and term. Fannie Mae allows a loan increase on a single-closing loan only for documented increases in construction cost.

What Can Derail a Pre-Approval Mid-Build

A long build gives your finances time to change. The common problems:

• New debt. A car loan or credit card balance can shift your ratios.
• Job or income changes. These can trigger re-verification.
• Large unexplained deposits. The lender will want a paper trail.
• Aging documents. Income, employment and credit documents can expire. Fannie Mae can require updated documents no more than four months old at conversion when terms have changed or document-age conditions were not met.
• A low final appraisal. The loan may need to be re-run at a different leverage.
• Overruns. Cost increases can be added only within limits, so budget a cushion from day one.
• Changed terms. The CFPB notes that terms you were quoted can still change if your application changes, so report any change to your loan officer promptly.

The fix is simple: do not take on new credit, keep your paperwork current, and tell your loan officer about any change.

Should You Use the Builder’s Preferred Lender?

No rule says you must. A builder’s lender can be convenient, since it already knows the builder’s process. Builders may also offer incentives for using them, and it is worth weighing those against what you would get by comparing options. A seller contribution, for instance, can offset costs; Lendmire’s piece How Much a Seller Concession Saves on a New Construction Conventional Loan walks through the mechanics.

The honest tradeoff: convenience against choice. If you compare, compare the full loan structure, not just one number. Not every lender writes construction loans, so confirm that before you apply.

Three Short Scenarios

Buying a finished spec home. You are a first-time buyer eyeing a home the builder has nearly completed. A pre-approval before you tour tells you your range, and the loan behaves much like any purchase. If you qualify as a first-time buyer on a fixed rate, the 97% leverage envelope may apply, subject to lender review.

Building on a lot you own. You hold the land and hired a builder. Get pre-approved first, then expect the lender to review the plans, budget and builder. A single-closing structure keeps you at one closing, provided the build fits inside the time limits.

Buying land, then building. Here the lender is financing the land and the construction. A pre-approval helps you set a ceiling before you commit to either. The path may call for two closings, so plan for a second qualification.

A few edge cases: attached condo units and co-ops are not eligible for construction-to-permanent financing, though detached condo units are permitted subject to project review. Teardown-and-rebuild on a lot you own is allowed with a single closing. Buying a unit in a brand-new condo project is a different path, since the project generally must be substantially complete.

Key Terms Defined

Pre-qualification: A lighter, often self-reported estimate with less verification than a pre-approval.

Construction-to-permanent loan: One loan that funds the build and then becomes your long-term mortgage.

Single closing: A structure where you sign once and the loan converts when construction ends.

Draw: A payment the lender releases to the builder as work is completed and inspected.

As-completed appraisal: A value opinion based on the plans and specifications of a home not yet built.

Common Mistakes

• Signing a builder contract before talking to a lender
• Paying for custom design before knowing your budget
• Reading a pre-approval as a loan commitment
• Taking on new debt during the build
• Choosing a single-closing loan for a build likely to exceed the time limits
• Skipping a cushion for cost overruns

If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file. For a related question, see Lendmire’s article Can You Roll Closing Costs Into a New Construction Conventional Loan?. Program details are subject to lender guidelines and full file review, and nothing here is a commitment to lend.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and home buyers in 16 states with FHA, VA, conventional and jumbo purchase and refinance loans arranged through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and the agency guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Consumer Financial Protection Bureau: Prequalification vs. preapproval letter

2. Fannie Mae Selling Guide B5-3.1-02 (Single-Closing)

3. Freddie Mac Guide 4602.2 (One-Time Close)

4. Fannie Mae Construction-to-Permanent FAQs

5. CFPB