Construction Loan vs. Fix-and-Flip Loan: Which Does Your Project Need?
By Andrew J. Liersch III — Founder & CIO, Slingshot Investments. 10+ years in private lending, $500M+ funded. Former Wells Fargo Private Mortgage Banking, Bear Stearns, and Deloitte Consulting.
Short answer: A fix-and-flip loan funds the purchase and renovation of an existing structure; a ground-up construction loan funds land plus a build from the dirt. The interesting question lives in between: heavy rehabs, major additions, and near-teardowns underwrite like construction even when the deal walks in wearing a flip’s clothes. Getting the classification right isn’t paperwork — it decides your leverage, how your interest accrues, your term length, and whether your timeline survives contact with the permit office.
Here’s the boundary, why lenders draw it where they do, and what the right structure is worth in dollars.
What each loan is built for
The quick recap. A fix-and-flip loan advances against purchase price plus a rehab holdback, sized by the lesser of ~65–75% of ARV or ~80–90% of cost, on a 6–12 month term — built for projects where the structure stays and the work is finish-level to gut-level. A construction loan advances against land, funds up to 100% of the vertical budget in a larger holdback, sizes against completed value, runs 12–18 months, and nearly always carries an interest reserve — built for projects where the building itself is the work product.
| Fix-and-flip | Ground-up construction | |
|---|---|---|
| Funds | Purchase + rehab of existing structure | Land + vertical build |
| Sized against | ARV | Completed value |
| Typical term | 6–12 months | 12–18 months |
| Holdback | Rehab budget, 3–5 draws | Full vertical budget, 5+ milestone draws |
| Interest reserve | Sometimes | Nearly always |
| Experience bar | Contractor can carry a first-timer | Track record or licensed GC required |
Where’s the boundary? When a “flip” is really construction
Four signals, any one of which moves a deal toward construction underwriting:
1. The structure is going away — mostly or entirely. A teardown is obvious. Less obvious: the “remodel” that keeps one wall for permitting purposes. If what’s standing at the end shares little more than a lot line with what you bought, it’s a build.
2. You’re adding significant square footage. A second story, a major addition, an ADU on the lot — new structure means foundations, framing inspections, and a construction timeline, whatever the marketing name for the project.
3. The budget rivals or exceeds the purchase price. When you pay $600K for a house and plan $700K of work, the risk lives in the work, not the house — and the loan should be structured around the work.
4. The work is structural, not cosmetic-to-gut. Foundation repair or replacement, reframing, moving load-bearing elements. The moment engineers and structural inspections enter the schedule, the draw structure needs to match a build’s milestones, not a renovation’s line items.
None of this is lender pedantry. A flip loan’s 6–12 month term, smaller holdback, and lighter inspection cadence are calibrated to renovation risk. Put a 14-month structural project on that chassis and the loan runs out of runway before the certificate of occupancy — which is how extension fees are born.
Why the right classification saves you money
Three concrete ways, using the mechanics from our cost breakdowns:
Leverage on the work. Flip loans commonly fund most-but-not-all of the rehab budget inside the overall caps. Construction loans routinely fund up to 100% of the vertical budget. On a $500K+ scope, that difference is real cash you’re not fronting.
How interest accrues. On a big, slow-deploying budget, as-drawn interest is worth tens of thousands versus paying on the full balance from day one — and as-drawn structures are native to construction lending.
Term and reserve. A 12–18 month term with an interest reserve means a structural project isn’t sprinting against maturity, and your liquidity isn’t drained by payments during the months the project can’t generate a dollar. A too-short flip term on the same project costs extension fees at best and a distressed refinance at worst.
The flip side: putting a genuinely cosmetic project on a construction chassis buys inspection cadence and reserve costs you don’t need. The cheapest loan is the one shaped like your project.
Three San Diego projects, three answers
Cosmetic-to-gut flip — fix-and-flip loan. A 1,400 sq ft house in La Mesa: kitchen, baths, flooring, systems, landscaping. Structure untouched, five-month schedule. Classic flip — underwritten on ARV, 3–4 draws, in and out.
Second story plus full gut — the gray zone, underwritten as construction. A Clairemont single-story taken to 2,600 sq ft with a new second floor. Purchase $850K, budget $600K, engineered foundations, framing and shear inspections, 12-month schedule. It’s marketed as a remodel; it underwrites as a build — milestone draws, longer term, reserve.
Teardown on an owned lot — construction loan. The Del Cerro spec build from our structure article: existing structure demolished, 2,200 sq ft new build, $1M project cost. No ambiguity — and if you own the lot free and clear, the land equity is your down payment.
Is one cheaper than the other?
At the rate sheet, no — both price in the same private money band, with construction typically carrying a modest premium (see the side-by-side in our construction cost article). The cost difference comes from structure fit: term length matched to the real schedule, interest matched to the real deployment curve, and a holdback matched to the real scope. Misclassification is the expensive option, in either direction.
Frequently asked questions
Can I switch loan types mid-project? Rarely cleanly — it’s a refinance, with new costs and a re-underwrite mid-construction. Classify honestly upfront; describe the full scope to your lender on day one, including the parts still “under consideration.”
Does adding an ADU make my flip a construction deal? The ADU itself is new vertical construction — foundations, permits, milestone inspections. Many lenders will structure the whole project construction-style, or carve the ADU budget into construction-type draws. Either way, the timeline should be underwritten like a build. (Business-purpose, non-owner-occupied projects only.)
What if I’m keeping the foundation and building new on top? Usually construction. The existing foundation may earn some value credit, but the schedule, inspections, and risk are a build’s.
Who decides the classification — me or the lender? The scope decides; the lender reads it. The practical move is presenting the full scope accurately and letting the structure follow — surprising your lender at draw #2 with a second story is how projects stall.
Slingshot Investments originates and arranges business-purpose ground-up construction loans on non-owner-occupied residential and commercial real estate. California DRE Broker License #02002790. All loans subject to borrowers and underlying collateral meeting current underwriting criteria. Rates and terms subject to change without notice. This article is general information, not a loan commitment or financial advice.
Ready to run your numbers? Call us at (619) 446-6930 or get started here.
