Spec Home Construction Loans for Investors: How Ground-Up Financing Works

Published August 2026 · By the SLA Capital team

Banks love construction loans for a homeowner building their own house. They get nervous about a spec — a home built with no buyer yet, by an investor who'll build the next one the moment this one sells. Private construction lending exists for exactly that builder. Here's how ground-up spec financing is actually structured.

What the loan covers

A spec construction loan funds two things: the land (the purchase, or paying off a lot loan — and if you own the lot free and clear, its equity usually counts as your contribution) and the vertical build — the hard-cost budget from foundation to certificate of occupancy. Soft costs like permits, plans, and engineering typically ride in the budget too.

At SLA, New Construction funds up to 85% of land plus 85% of construction cost, rates from 10%, 18 or 24 month terms with straightforward extensions, loans $100K–$7.5M. You bring ~15% plus closing, carry, and contingency.

Two leverage tests decide your loan

Like rehab loans, spec construction has a loan-to-cost ceiling (the 85%) and a completed-value ceiling — a cap as a percentage of the finished home's appraised value, typically 65–70% of ARV. Your loan is the lesser of the two. A lot you bought cheap plus an efficient build leaves both tests comfortable; a premium lot with a luxury build tends to hit the completed-value cap first, meaning more cash in. Run both before you buy the dirt.

Draws: how the money actually flows

The land funds at closing. The construction budget sits in escrow and releases in draws against completed milestones — foundation, framing/dry-in, mechanicals, drywall and finishes, final. You submit photos and invoices, an app-based inspection confirms percent complete, funds wire in days. Ground-up builds typically run 4–7 draws. The full request → inspection → funding cycle, and what stalls it, is in How Construction Draws Work.

Interest on drawn balance — the term that changes everything

On an 18-month build, the single biggest cost lever is whether interest accrues on the full commitment from day one or only on the drawn balance. On a $600K budget, paying interest on $600K while you've only drawn $120K for the foundation is a brutal way to carry a project. Drawn-balance interest — standard on well-structured private construction loans — means the carry ramps with the build. Read the term sheet for exactly this line.

Experience: what lenders expect from a spec builder

• Track record. Completed builds or heavy rehabs count. First ground-up? A licensed GC with a real bid, a realistic schedule, and a contingency line make a first-timer fundable at lower leverage.
• Permits and plans. Approved plans and pulled (or pullable) permits are the gating item — underwriting moves fast once they're in; the 10-day average close at SLA assumes they are.
• Budget with contingency. 10% minimum on a ground-up build. Lenders read a zero-contingency budget as an unfinished budget.
• Liquidity. Down payment plus the carry for the full term plus contingency, documented.

Plan the exit before you break ground

A spec loan is repaid one of two ways, and the better builders pencil both:

Sell. The classic spec exit — completed-value appraisal and comps should support a sale price with margin after construction interest, points, realtor fees, and your time.

Hold and refinance. If the market softens or the rent is strong, refinance the finished home into a 30-year DSCR loan (from 5.95% at SLA, highest credit tier and LTV below 60%) and keep it as a brand-new rental — no income docs, closing in your LLC. Build-to-rent is the same loan stack, on purpose. A spec that pencils both ways has no bad outcome.

The SLA construction box

Land + vertical at up to 85% LTC · from 10% · 18 or 24 months · $100K–$7.5M · draws through an online portal with app-based inspections · 42 states. And because we also do DSCR, the hold-and-refi exit is the same conversation, not a new lender.