Debts means car, student loans and card minimums. Not groceries or utilities.
Your payment after move-in
$4,954/mo
With your other debts, that's 35% of your income before tax.
Comfortable
Under 36%, where lenders and budgets both tend to be happy.
Mortgage you’d need
$625,000
While building, about
$3,459/mo
Groundbase keeps this number updated as the budget moves.
Start freeThe question is not only whether you can get a construction loan approved. The better question is whether the finished home still fits your monthly life after the build is done and the temporary construction picture turns into a permanent payment.
What to compare
Two tests
construction-period affordability and finished-home affordability
Comfort range
45% or lower
common upper range for lender-friendly DTI
The real check
Real life
the number that matters after the build is done
What moves the answer most
- How much cash you keep available instead of putting into the project upfront.
- Whether you sell your current home first or carry both for a while.
- The final loan amount after contingency, overruns, and change orders are accounted for.
- The mortgage rate and term the construction loan eventually converts into.
A worked example
Say the build costs $825,000 and you put in $200,000 of your own cash. That leaves a $625,000 mortgage. At 6.75% over 30 years, principal and interest come to about $4,053 a month. Add $900 for property tax and insurance and the payment is about $4,953.
A household income of $210,000 is $17,500 a month before tax. The payment plus $1,200 of other debts comes to $6,153, or 35% of income, just inside the comfortable range. Put in $50,000 less cash and the payment rises by about $324 a month, which pushes it to 37% and into the tight zone.
Approved does not always mean comfortable
Lenders look at defined underwriting thresholds. Your actual life is messier than that. A build can technically qualify and still leave you with a finished-home payment that feels too aggressive once taxes, insurance, kids, travel, and everything else come back into focus.
That is why the finished-home DTI matters so much. It forces the plan out of the construction-loan moment and into the monthly reality that lasts for years.
If the number feels tight
- Reduce scope before the build starts, when changes are still cheap to make.
- Keep more contingency in the plan so the loan amount does not quietly grow later.
- Change the timing of selling your current home or using its equity.
- Re-run the scenario with a more conservative mortgage rate so you are not surprised later.
Common questions
What debt-to-income ratio do lenders want?
Many lenders like to see 36% or less, and most cap it somewhere around 43 to 45%. Staying under 36% usually leaves room in your monthly budget as well.
Is DTI based on income before or after tax?
Before tax. Lenders use gross monthly income, which is why a DTI that looks fine on paper can still feel tight once taxes come out.
What counts as debt in DTI?
Monthly payments on loans and credit: car loans, student loans, credit card minimums and any other mortgage. Everyday bills like groceries, utilities and phone plans don't count.
Should property tax and insurance be in the payment?
Yes. Lenders qualify you on the full housing payment, so this calculator adds them to principal and interest. Swap in your county's tax rate and a real insurance quote when you have them.
Keep reading
DTI and Construction Loans
What debt-to-income ratio means for a construction loan and why the finished-home DTI is the number that matters most.
Read guideShould You Sell Your Current Home Before Building?
Compare the cash, DTI, reserve, and timing tradeoffs between selling first and carrying both for a while.
Read guideConstruction Loan Interest vs Mortgage Payment
Understand the difference between the temporary build-phase payment and the long-term mortgage payment after completion.
Read guide