Ground-Up Construction Loans for Investors: What Makes a New-Build File Financeable

Here's how a typical investor spec build works financially, from dirt to closing check.

You buy a vacant lot for $85,000 in a neighborhood where new 3-bed/2-bath homes sell for $380,000-$420,000. Your construction budget is $235,000 all-in (hard costs + soft costs + contingency). Total project cost: $320,000.

You apply for a ground-up construction loan at 85% of total cost (LTC). The lender funds $272,000, structured as: $72,250 for land acquisition + $199,750 for construction draws. Your cash in: $48,000 down payment + $6,000 closing costs = $54,000.

The build takes 9 months. During construction, you pay interest only on drawn funds. Average outstanding balance over 9 months is roughly $160,000. At 11% interest, your total carry cost is about $13,200.

The finished home appraises at $395,000. You list it at $399,900 and sell for $392,000. After 5% in selling costs ($19,600), you net $372,400. Pay off the construction loan balance ($272,000) and your total cash returned is $100,400.

Your profit: $100,400 - $54,000 (cash in) - $13,200 (carry) - $6,000 (selling closing costs you funded) = $27,200. Your cash-on-cash return: 37% over 11 months.

That's a solid spec build. But notice how tight the margins get if the build runs 3 months long ($4,400 in extra interest), or if the sale price drops 5% ($19,600 less). Construction profit lives in the details.

Construction lending is project-based underwriting. The lender is evaluating whether this project will produce a finished asset worth more than the loan. Here's what they scrutinize, in order of importance:

Completed value (ARV): The lender orders a construction appraisal with two values -- as-is (land only, typically $80,000-$120,000) and as-completed (the projected value of the finished home). Most private lenders cap at 65-75% of the as-completed value. If your finished home appraises at $400,000 and the lender caps at 70% ARV, your maximum loan is $280,000 regardless of what your actual costs are.

Construction budget: Lenders want a line-item budget, not a lump sum. They need to see site work ($15,000-$25,000), foundation ($20,000-$35,000), framing and roof ($45,000-$65,000), mechanical/electrical/plumbing ($30,000-$45,000), interior finishes ($35,000-$55,000), exterior and landscaping ($15,000-$25,000), plus soft costs (permits, architecture, engineering, inspections: $10,000-$20,000). If your budget is 20% below area construction costs per square foot, the lender will question it.

Contractor credentials: Licensed GC with insurance (general liability + workers' comp), a track record of 3+ completed projects of similar scope, and references. If you're acting as owner-builder, most private lenders want to see you've completed at least 2-3 builds previously.

Borrower experience and reserves: First-time builders face higher scrutiny. Expect 25-30% down (vs. 15-20% for experienced builders). Reserves of 6-12 months of projected interest payments are standard. On a $272,000 loan at 11%, that's $2,493/month -- so $15,000-$30,000 in reserves beyond your down payment.

Construction loans don't fund all at once. Money is released in draws as you complete milestones. A typical 5-draw schedule on a $235,000 build budget:

Draw 1 -- Foundation complete: $47,000 (20%). Released after the inspector verifies foundation is poured, cured, and passed local inspection.

Draw 2 -- Framing and dry-in: $58,750 (25%). Released after framing, roof, and windows are installed. The structure is weather-tight.

Draw 3 -- Mechanical rough-in: $47,000 (20%). Released after plumbing, electrical, and HVAC rough-in pass inspection.

Draw 4 -- Interior finishes: $47,000 (20%). Released after drywall, paint, cabinets, and flooring are installed.

Draw 5 -- Final completion: $35,250 (15%). Released after certificate of occupancy is issued. Some lenders hold 5-10% as a completion holdback until the CO is in hand.

Between draws, you're paying contractors out of pocket or managing their payment expectations. Each draw request triggers a lender inspection ($150-$300 per inspection), which takes 3-7 business days to schedule and process. If your framing crew finishes on Monday and the draw doesn't fund until the following Monday, you need cash to bridge that gap.

Pro tip: Before committing to a lender, ask about draw processing time and whether they allow more frequent draws (monthly instead of milestone-based). Faster draw processing means less cash tied up between milestones.

The total financing cost of a construction loan is higher than a standard mortgage, and it's easy to underestimate. Here's every cost on a $320,000 project ($85K land + $235K construction) with a $272,000 loan:

Origination fee: 2-3 points. At 2.5 points on $272,000 = $6,800.

Interest during construction: You only pay interest on drawn funds, not the full commitment. On a 9-month build with an average outstanding balance of $160,000 at 11%, total interest is approximately $13,200. If the build stretches to 12 months, that jumps to $17,600.

Draw inspection fees: $150-$300 per draw x 5 draws = $750-$1,500.

Appraisal fee: Construction appraisals cost $500-$1,500 (higher than standard appraisals because the appraiser evaluates plans, not just comps).

Title and escrow: $2,000-$4,000 depending on state.

Builder's risk insurance: $1,500-$3,500 for the construction period. This is separate from the permanent homeowner's policy you'll need after completion.

Permit fees: $3,000-$15,000 depending on jurisdiction. Major metro areas charge significantly more than rural counties.

Extension fees: If you go past your loan term, expect 0.5-1% of the loan amount per extension. On a $272,000 loan, that's $1,360-$2,720 per month of extension.

Total financing cost on this deal: roughly $28,000-$35,000, or 8.5-11% of total project cost. When you model your profit, these costs must be included alongside construction costs and selling costs, not treated as an afterthought.

Every construction lender asks about your exit strategy because that's how they get repaid. The three options have different financial profiles:

Sell (spec build): You build and list immediately after completion. This is the fastest path to repaying the construction loan but carries market risk. If homes are taking 60-90 days to sell in your area, add 3 months of carry cost to your budget. On the $272,000 loan above, that's $7,480 in additional interest.

Refinance into DSCR (build-to-rent): You complete the build, place a tenant, and refinance into a 30-year DSCR loan. If the completed value is $395,000 and you refinance at 75% LTV, your DSCR loan is $296,250. That pays off the $272,000 construction balance and returns about $18,000 after closing costs. You now own a brand-new rental with strong DSCR (new homes rent well relative to payment because maintenance costs are near zero). The downside: your capital is recycled more slowly than selling.

Refinance into conventional: If you qualify personally (W-2 income, DTI room, under 10 financed properties), a conventional loan offers the lowest long-term rate. But the timeline is longer (30-45 days) and the documentation burden is heavier.

The strongest construction investors pick their exit before they buy the lot. If you're building to sell, your design and finish level should match the buyer market. If you're building to rent, your design should maximize rent relative to construction cost, which often means different finishes than a sale-oriented build.

Whichever exit you choose, start the process 60-90 days before your construction loan matures. Don't wait until the last month -- that's when extension fees and rush pricing eat your profit.