The Quick Read: The right line for a ground-up build depends on which property secures it. A HELOC borrows against a home you already own, never against the house you are building. In practice it works as a down payment or overrun source beside a construction loan, not as the build loan itself.
- The line is secured by an existing property with equity in it. It cannot be opened on land or a house you do not yet own.
- On Lendmire’s wholesale network, investment-property lines top out at 70% combined loan-to-value (CLTV). Primary-residence and second-home lines reach 90% CLTV only at a 720 credit profile or better.
- At least 75% of the line is drawn at closing, so it is not a pay-as-you-build account. Plan the carrying cost around that.
- Entities such as LLCs cannot hold title on these lines. Manufactured and log homes are not eligible.
- The strongest builds pair enough equity with a clear exit, usually a permanent loan on the finished property.
Can a HELOC Actually Build a New House?
Only if the equity in your existing property covers the whole build. Even then, the line stays attached to the old property. The new house is not the collateral.
How large a line the equity supports.
An equity line is sized by combined loan-to-value, occupancy, and credit — not by rental coverage. Switch the occupancy or the credit band and the ceiling moves with it.
Investment-property lines require a 700 minimum credit score; second-home lines start at a 640 minimum and primary-residence lines at 600, and the combined-LTV ceiling steps down as the credit band drops on primary-residence and second-home lines and holds on investment-property lines; the line cap steps down on primary-residence lines and holds at every tier on investment-property and second-home lines.
A debt-to-income ratio above 45% requires 680+ credit. Profiles under 640 are limited to single-family homes. At least 75% of the approved line is drawn at closing. Ceilings, floors, and caps update from Lendmire’s centralized guideline source.
Line estimate
Illustrative estimate only — not a quote, Loan Estimate, approval, or commitment to lend. The rate is an editable assumption; equity-line pricing is variable through both the draw and repayment periods and never converts to fixed. Occupancy and credit drive the ceiling together: an investment property tops out at 70% combined LTV (minimum credit 700, line cap $500,000); a second home tops out at 90% combined LTV (minimum credit 640, line cap $500,000), with the ceiling stepping down as the credit band drops (the cap holds at every tier); a primary residence tops out at 90% combined LTV (minimum credit 600), and its $750,000 maximum line is available only at 75% combined LTV or below with a 700-or-better credit profile (720 on the longer-runway program) and a full appraisal. Lines above $500,000 require a full appraisal. Credit, debt-to-income, property type, and full underwriting review all affect the final line.
That one fact shapes every decision below. A construction loan lends against the project and releases money in stages. A HELOC lends against what you already own, as a revolving line, and does not care what you build with it.
So “best program” is the wrong first question. Ask three things first. Which property will secure the line? How much equity does it carry? What replaces the line when the house is done?
Lendmire is a mortgage broker, not a lender. It shops a wholesale network of HELOC lenders and matches your equity, credit profile and property to the program that fits. The best program for your situation will not be the best for someone else’s.
How Underwriting Treats a HELOC, Step by Step
Underwriting a HELOC is a borrower-and-collateral review. It is not a project review. Lenders look at the following, in roughly this order.
1. The collateral. Single-family homes, 2-4 units, PUDs, townhomes and condos (including non-warrantable condos) are eligible. Modular factory-built homes are eligible on the longer-runway program only. That is one of the two wholesale programs behind these files, described below.
2. Title. The individual borrower or an inter vivos revocable living trust must hold title. A property already deeded to an LLC needs a vesting change first.
3. Combined leverage. Your existing mortgage plus the new line cannot exceed the CLTV cap for your credit tier and occupancy.
4. Credit. The program floor is 600, and a single-bureau score tied to the primary wage earner drives the tiers.
5. Debt-to-income (DTI). The maximum is 50%, or 45% for profiles from 600 to 679. A ratio above 45% requires a 680 minimum. The lender reviews your file on the interest-only payment calculated on the maximum draw, not on what you plan to use.
6. Valuation. Lines at or below $500,000 ordinarily use an automated valuation. Lines above $500,000 require a full appraisal.
Point 5 catches builders. If you plan to take a construction loan too, a new line counts against your DTI at the full amount. A borrower near the limit can be pushed over it.
What the Leverage Tiers Look Like by Occupancy
The ceiling depends on how the securing property is used. Do not read a single headline figure as applying to you.
| Securing property | Top CLTV | Credit needed for top tier | Max line |
|---|---|---|---|
| Primary residence | 90% | 720+ | $500,000 at 90%; up to $750,000 at 75% |
| Second home | 90% | 720+ | $500,000 |
| Investment property | 70% | 700+ | $500,000 |
Lower credit tiers step the ceiling down. On a primary residence, a 640 profile reaches 80% CLTV, a 620 profile reaches 70%, and a 600 profile reaches 60%. Second homes floor at 640 and investment properties at 700. A line above $500,000 is primary-residence only. It requires a credit profile of 700 or better (720 on the longer-runway program) and caps at 75% CLTV.
Say you own a primary home with a mortgage balance near 40% of its value and a 720 score. A 75% CLTV tier leaves roughly 35% of the home’s value as potential line. The line cap and valuation then trim that figure. An investment property with the same 40% balance would leave about 30% under the 70% ceiling, capped at $500,000.
The figures in the table are the ones that apply through Lendmire’s network, subject to lender guidelines and full file review.
How the Two Draw Structures Work
Lendmire places these files with two wholesale programs. A higher-leverage program reaches the top CLTV tiers. A longer-runway program offers the 5-year draw with a 25-year repayment and has the tighter credit-history standards.
On primary residences and second homes, two structures exist:
- A 3-year interest-only draw followed by a 17-year fully amortizing repayment.
- A 5-year interest-only draw followed by a 25-year fully amortizing repayment.
Investment lines run the 5-year draw and 25-year repayment structure only. Pricing floats across both the draw and the repayment period and never converts to fixed. A quoted figure always belongs to its own program’s structure.
The detail that matters most for a build: at least 75% of the line is drawn at closing. This is not a pay-as-you-go construction account. If you need funds in stages over a long build, you start paying on most of the line before the builder’s later invoices arrive. Afterward the minimum subsequent draw is $1,000 on the longer-runway program.
Where a HELOC Fits Next to a Construction Loan
A construction loan funds the build in staged draws tied to progress and inspections. A construction-to-permanent loan then converts to a standard mortgage when building ends. Freddie Mac’s consumer education page notes that a construction-only borrower who cannot repay at completion must convert to a standard mortgage. That means two sets of closing costs.
A HELOC does none of that. It does not release money against milestones. It has no built-in permanent financing. It cannot lend against projected value.
That is why the common structure is a stack. The construction lender wants a meaningful equity contribution, and a HELOC draw on your existing property supplies it. An investor on a BiggerPockets thread about using a HELOC for ground-up construction described the same logic. Use the line as the down payment instead of routing the money through the land first. Responders there also urged factoring the full line payment into carrying costs.
Here is how the roles divide.
| Situation | Role for a HELOC | Why |
|---|---|---|
| Equity-rich owner, modest build | Can fund most of it | The equity covers the cost |
| Equity-rich owner, large build | Down payment beside a construction loan | A construction loan lends on projected value |
| Little equity, recent buyer | Weak fit | The CLTV cap leaves little room |
| Cost overruns mid-build | Reserve line, if opened beforehand | Opening a line mid-construction is harder |
| Build held in an LLC | Not eligible | An LLC cannot hold title on these lines |
When the Answer Changes
Land you already own. You can only borrow against the land if the program treats it as the securing property. Expect conservative treatment when no finished house exists. Many borrowers do better using the equity in their primary home instead.
A line on the rental itself. Investment-property lines carry the lowest ceiling on the network, 70% CLTV, with a 700 credit minimum. The property must exist and meet eligibility. A ground-up build has no property yet.
A new line while a construction lender is involved. Some construction lenders ask that existing lines be closed or subordinated. Raise this with your broker before you open a line, not after.
Prior credit events. A bankruptcy needs 4 years of seasoning from discharge or dismissal. Foreclosure-family history splits by program. One program seasons a foreclosure at 7 years and a deed-in-lieu, pre-foreclosure or short sale at 4. The other declines that history entirely.
Too many lines or properties. A borrower is limited to three lines. Combined exposure caps at $2,000,000 on the higher-leverage program and $750,000 on the longer-runway program. A borrower with more than 15 financed properties is not eligible.
Property types. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use and agriculturally zoned properties are not eligible. If your plan is a log home or a barndominium-style build, a HELOC is not the route.
Where the product is available. Lendmire arranges these lines in 16 states, which is narrower than its 41-market DSCR footprint. Check the footprint before you build a plan around a line.
What Happens After the House Is Finished
For an owner-occupied build, the line stays on the original property until you pay it down or refinance. For a rental build, the usual endgame is permanent financing on the finished home.
A line on your primary home also remains your personal debt. The CFPB’s HELOC booklet defines a HELOC as a line you borrow against with your home as collateral. It warns that falling behind on payments can cost you the home. Using home equity to build a rental puts your own residence behind a project that does not yet produce income.
When the rental is finished and leased, a DSCR loan is the natural take-out. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. It is a business-purpose loan for non-owner-occupied investment property, and it is reviewed differently from a standard owner-occupied mortgage. Lendmire’s complete DSCR loans guide walks through the mechanics.
Some patterns hold across the network. On a cash-out refinance, leverage tops out around 75% LTV, and about 6 months of seasoning is the common expectation. A 1.00 coverage ratio is where select programs start, not a standard. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Most programs want credit near 660, and 700 or better opens the strongest tiers.
One caution on reading the math. DSCR compares rent to the full payment (principal, interest, taxes, insurance and any association dues). Clearing 1.00 is not the same as positive cash flow. Repairs, vacancy, management, utilities and capital costs sit outside the calculation.
A Sequence That Works for a Rental Build
Run the plan backward from the exit. A workable order looks like this.
1. Measure usable equity. Take value times the CLTV cap for your credit tier and occupancy. Subtract what you owe. Apply the line cap.
2. Check DTI with the line at its maximum draw. The lender reviews your file on that figure.
3. Open the line before you need it. Lines are harder to open once construction is underway.
4. Draw knowing 75% funds at closing. Plan where that cash sits until the builder needs it.
5. Pair it with the construction financing. Confirm whether the construction lender wants the line closed, kept or subordinated.
6. Plan the exit. Decide whether the finished home will be refinanced into permanent financing, and check coverage and seasoning against that plan.
7. Reserve for overruns. Budget a cushion so you are not drawing further on a line already near its limit.
Risks to Plan For
The largest risk is that your own home backs the project. If the build stalls or overruns, you carry two obligations while the new house earns nothing.
The second risk is carrying cost. Most of the line is drawn at closing and pricing floats. A long build with a delayed exit costs more than a short one.
The third is the draw ending. The 3-year and 5-year interest-only periods end, and fully amortizing payments begin. Build the exit to land well before that date.
The fourth is value risk. If your existing property drops in value, your cushion shrinks, and you may find the line does not stretch as far as planned.
Tax treatment can depend on how the funds are used and how the property is held. Borrowers should keep clear records and speak with a qualified tax professional before relying on any deduction.
Who Should Not Use a HELOC to Build
Skip it if your plan depends on borrowing against the house you have not built. Skip it if you have little equity, because a construction loan lends against projected value and a HELOC does not. Skip it if you would hold the project in an LLC, because that title structure is not eligible. Skip it if the line is the only thing between you and a payment you cannot carry.
Key Terms Defined
CLTV (combined loan-to-value): Your existing mortgage plus the new line, divided by the property’s value.
Draw period: The stretch when you can borrow and pay interest only.
Repayment period: The stretch after the draw ends, when payments include principal.
Construction loan: A loan that releases money in stages as the build progresses.
DSCR (debt service coverage ratio): Monthly rent divided by the full monthly payment on a rental.
Seasoning: The waiting period a lender wants before a refinance or after a credit event.
Subordination: An agreement that moves an existing lien behind a new one.
Frequently Asked Questions
Can I use a HELOC to buy land for a new home?
Not directly. You cannot open a line against land you do not own. You can borrow against another property you own and use the proceeds toward the land. That puts the equity of the securing property at risk, so size it carefully.
Is a HELOC cheaper than a construction loan?
It can cost less upfront, but a construction loan may be the only route when equity cannot cover the budget. A construction-only borrower also pays two sets of closing costs. The better comparison is total carrying cost over the whole build, including the 75% drawn at closing on a HELOC.
Can I get a HELOC on an investment property to fund a build?
Possibly, within limits. Investment-property lines cap at 70% CLTV with a 700 credit minimum and a $500,000 maximum line. The property must exist already and be held in your own name or a revocable living trust, not an LLC.
What credit score do I need?
The program floor is 600, but your score sets your ceiling. The top 90% CLTV tier on primary residences and second homes requires 720 or better.
Does a DSCR loan replace the HELOC after the house is built?
It can serve as the take-out on a finished, leased rental. A DSCR loan reviews the property’s rent against its payment. Eligibility depends on coverage, credit, leverage, seasoning and the lender’s guidelines. If you are weighing a line and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage and your goals.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker. Home equity lines of credit — on a primary residence, a second home or an investment property — are arranged through wholesale lenders in Lendmire’s 16 full-service states, and every line is underwritten by the lender under its program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
Investors who want the broader program framework can review how DSCR loans work.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. Freddie Mac MyHome: loan options for building your home
2. BiggerPockets: using a HELOC to purchase land for ground-up construction
This article is part of Lendmire’s HELOC & home equity loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Best Investment Property HELOC Program to Buy Rental Property for New Landlords · Best HELOC Program as a Backup Emergency Fund · Best Investment Property HELOC Program to Buy Rental Property
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.