ADU Construction Loans: How They Work and Who Qualifies
A construction loan is built around the project, not just the house you live in today. The lender reviews your plans, budget and builder, then pays out money in stages as the ADU goes up. Because it can lend against the finished value, it often reaches further than your current equity.
- We explain every option, not just one product
- Matched with lenders who finance ADUs
- No obligation to take any offer
How a construction loan pays for an ADU
Before closing, the lender wants permit ready plans, a line by line budget, a signed contract with a qualified builder, and an appraisal of the property as it will look once the ADU is complete. That as-completed value is what lets the loan stretch past today's equity.
After closing, money is released in draws. Your builder finishes a stage, an inspector confirms the work, and the lender pays that stage. During the build you often pay interest only on what has been drawn.
When the unit is finished, the loan either rolls into a regular mortgage (a one time close, also called construction to permanent) or you refinance into a new loan (a two time close).
At a glance
- Best for: owners whose equity today will not cover the full build
- How money arrives: draws after each inspection
- Rate type: varies by lender and by close type
- What lenders check: credit, income, plans, budget, builder and an as-completed appraisal
Construction loan pros and cons for an ADU
Pros
- Can lend on the finished value, not only today's equity
- You pay for what is built, as it is built
- Inspections give a second check on the builder's progress
- A one time close can avoid a second round of closing costs
Cons
- More paperwork and a slower closing than equity loans
- Your builder must be approved by the lender
- Overruns may have to come from your own pocket
- A two time close means qualifying twice
When another loan fits better
If your equity already covers the budget, a HELOC is simpler and draws in stages much like a construction loan. If you are converting existing space, an FHA 203k renovation loan may fit. If you plan to rent the unit, check whether projected rent can help you qualify.
HELOC for an ADU
Draw on your equity as builder invoices arrive.
FHA and 203k loans for an ADU
Government backed routes for buying or converting.
Using ADU rental income to qualify
When lenders can count future rent from the unit.
ADU construction loan questions
What are the common mistakes when building an ADU?
Starting with a loose budget, skipping utility and site work costs, and choosing a builder before checking that the lender will accept them. Leave a contingency in the budget, because overruns are usually yours to cover.
Is it difficult to get a construction loan?
It takes more preparation than an equity loan. You need finished plans, a detailed budget and an approved builder before closing. Borrowers who arrive with those in hand usually find the process far smoother.
How much do I have to put down on a construction to permanent loan?
Each lender sets its own requirement based on the loan program, your credit and the as-completed value. Existing equity in your home can often count toward it. Ask for the requirement in writing before you sign with a builder.
Talk to a lender who finances ADUs
Tell us about your plans, your builder and your rough budget. We will connect you with a lender who offers ADU construction loans so you can compare real terms.
Talk to a specialist: (555) 555-0141
Thanks. We have your details and a lender who finances ADUs will be in touch, usually within one business day.