Construction Loan vs. Mortgage: How New Build Financing Works
Buying an existing home and building one from scratch are financed entirely differently. A standard mortgage uses the existing property as collateral — the lender knows exactly what they’re securing. A construction loan funds a home that doesn’t exist yet, in phases, as it’s built. The risk profile is different, the process is different, and the costs are different.
Here’s what you need to know.
What Is a Construction Loan?
A construction loan is a short-term loan — typically 6 to 18 months — that finances the building of a new home. Unlike a mortgage, the lender doesn’t hand you the full amount at closing. Instead, funds are drawn in stages as construction milestones are reached.
How draws work:
- Foundation complete → first draw released
- Framing complete → second draw
- Rough mechanical (HVAC, plumbing, electrical) → third draw
- Drywall and exterior → fourth draw
- Completion/certificate of occupancy → final draw
During construction, you typically pay interest only on the amount drawn — not the full loan amount. As draws accumulate, your interest payments increase.
Construction Loan vs. Standard Mortgage
| Feature | Construction Loan | Standard Mortgage |
|---|---|---|
| Term | 6–18 months | 15–30 years |
| Rate | Usually variable (prime + margin) | Fixed or adjustable |
| Payments | Interest only on drawn amount | Principal + interest |
| Collateral | Land + work-in-progress | Completed home |
| Appraisal | Based on plans and specs | Based on existing structure |
| Lender oversight | Active (draw inspections) | None after closing |
| Availability | Specialty lenders; fewer options | Widely available |
The Two Main Structures
Construction-to-Permanent Loan (One-Time Close)
This is the most borrower-friendly structure. You apply once, close once, and the loan automatically converts from a construction loan to a permanent mortgage when the home is complete.
Advantages:
- Single closing = single set of closing costs
- Rate is typically locked at the start
- Simpler process overall
Disadvantages:
- Harder to qualify (you’re underwritten for both the construction phase and the permanent mortgage simultaneously)
- Fewer lenders offer this product
- Rate lock during construction can be expensive if construction runs long
Two-Time Close (Standalone Construction Loan + Separate Mortgage)
You get a construction loan to build, and then — when the home is complete — you close on a separate permanent mortgage. The construction loan is paid off by the permanent mortgage proceeds.
Advantages:
- More lenders available for each product separately
- You can shop for the permanent mortgage rate when construction is complete
- More flexibility if construction timeline extends
Disadvantages:
- Two sets of closing costs (construction loan + permanent mortgage)
- Two rounds of underwriting, appraisal, and documentation
- Rate on permanent mortgage is unknown at construction start
Qualifying for a Construction Loan
Construction loans have stricter requirements than standard mortgages because they’re higher-risk:
Credit score: Most lenders require 680–720 minimum. Some require 700+.
Down payment: Typically 20–25% of the projected total cost (land + construction). Some lenders count existing land equity toward this.
DTI: Standard limits apply (43% back-end), but lenders scrutinize more carefully given the project risk.
Cash reserves: 6–12 months of expected mortgage payment, often required after closing.
Builder approval: Your builder must be licensed, insured, and typically approved by the lender. The lender will review the builder’s track record and financial standing.
Detailed construction plan: You need complete plans, specifications, and a firm construction contract with a licensed builder. Lenders need to know exactly what’s being built and at what cost.
The Appraisal Challenge
Construction loan appraisals are done based on plans and specifications — the appraiser estimates what the completed home will be worth, not what exists today. This is called an as-completed appraisal.
If the appraiser’s value comes in below the total project cost (land + construction), you may face a gap — either contributing more cash or reducing the scope of the project. This is a real risk in markets where construction costs have outpaced home values.
Builder’s Risk and Lender Oversight
During construction, the lender is actively involved in monitoring progress. Before each draw is released:
- An inspector verifies the milestone is complete
- The builder submits draw requests with supporting documentation
- Lien waivers are collected (protecting against subcontractor claims)
This oversight protects the lender — and you. It prevents the builder from drawing funds ahead of completed work.
Builder’s risk insurance (a form of property insurance during construction) is required and is typically purchased by the builder or included in the construction contract.
Cost Differences vs. Buying Existing
Building new typically costs more than buying comparable existing construction in the same area — construction costs include land, labor, materials, permits, and builder overhead. The value proposition is customization, newer systems, and modern efficiency — not cost savings.
Construction financing adds:
- Higher closing costs (sometimes two closings)
- Construction loan interest during the build (often 6–12 months of interest-only payments)
- Appraisal and inspection fees
- Contingency reserve (typically 10–15% of build budget held by lender)
Budget for total out-of-pocket:
- Down payment (20–25%)
- Construction loan closing costs (1–3%)
- Interest during construction (depends on rate and draw schedule)
- Permanent mortgage closing costs if two-time close
- Contingency reserve (may be returned if unused)
New Construction from a Developer: Different Financing
Buying a new home from a production builder (Pulte, DR Horton, Lennar, etc.) is different from custom construction. With tract builders:
- You’re buying a completed or to-be-completed home — the builder has already financed construction
- You get a standard purchase mortgage — no construction loan needed
- The builder’s preferred lender often offers incentives (rate buydowns, closing cost credits) to use their in-house financing. Shop independently before committing — the incentives sometimes compensate for a less competitive rate, and sometimes they don’t.
The construction loan described in this article applies to custom home construction — hiring a builder to construct a home on land you own or are purchasing separately.
Frequently Asked Questions
Can I use an FHA or VA loan for new construction? Yes. FHA and VA both have construction-to-permanent programs. FHA requires the builder to be FHA-approved. VA’s construction loan program is less widely offered but exists. These programs follow the same credit and DTI requirements as standard FHA/VA purchase loans.
What happens if construction is delayed? construction loans have a maturity date — if construction isn’t complete by then, you may need an extension (which costs money and may require re-underwriting). Choose a lender with a clear extension policy and make sure your construction contract has realistic timeline expectations.
Can I lock in a mortgage rate before construction starts? With a construction-to-permanent loan, yes — the rate is typically locked at origination. With a two-time close, the permanent mortgage rate is set when you apply for that loan, after construction is complete. Some lenders offer float-down provisions to capture rate decreases during construction.
Do I pay rent and construction loan interest at the same time? Often yes. If you’re renting while your home is being built, you’re paying both rent and interest-only payments on the construction loan simultaneously. Budget for this dual housing expense — it typically runs 6–12 months.
The Bottom Line
Construction financing is more complex, more expensive, and more time-consuming than a standard mortgage — but it’s the path to getting exactly the home you want rather than choosing among what’s available. The key to a smooth process is choosing an experienced lender with a clear construction loan process, a licensed and vetted builder, and a realistic budget that includes contingencies.
Don’t underestimate the project management burden. Even with a full-service builder, you’ll be involved in decisions, approvals, and communication throughout the build. Go in prepared.
Next step: Already have a home and considering a renovation? Read FHA 203(k) Rehab Loan: Finance a Fixer-Upper With One Loan for an alternative renovation financing path.
Sources
- Consumer Financial Protection Bureau: Construction Loans — consumerfinance.gov
- Fannie Mae: Construction-to-Permanent Financing Guidelines — fanniemae.com
- National Association of Home Builders: New Home Financing — nahb.org
Disclaimer: Construction loan terms, requirements, and availability vary significantly by lender and market. Consult a lender experienced in construction financing before proceeding. HomeFinanceLab.com is not a lender and does not originate loans.
