Here you’ll find answers to the most common questions about our homebuilding process, project options, and services. We aim to make your experience clear, transparent, and confident from start to finish.
There are several viable paths depending on how much equity you have in your primary home and your overall financial picture. The most common options are a cash-out refinance, a home equity line of credit (HELOC), a home equity loan, a construction loan, and ADU-specific loan products that have emerged as ADUs have become more mainstream. Each has tradeoffs in terms of rate, flexibility, and how funds are disbursed. We work with lenders active in Idaho’s ADU market and can help connect you with the right fit for your situation.
Yes — and for most homeowners, this is the most straightforward path. If your primary home has appreciated significantly (as most Boise-area homes have over the past several years), you may have enough equity to fund an ADU build entirely through a cash-out refinance or HELOC without needing additional cash. The key question is whether the equity you can access covers your construction budget, which for a detached ADU in the Treasure Valley typically runs $150,000–$280,000+ depending on size, finishes, and site conditions.
A cash-out refinance replaces your existing mortgage with a new, larger one — and you receive the difference in cash at closing. For example, if your home is worth $550,000 and you owe $250,000, you might refinance to $430,000 and walk away with $180,000 to fund your ADU build. It makes the most sense when current mortgage rates are close to or better than your existing rate, or when you need a large lump sum and want a single fixed monthly payment. In a higher-rate environment, some homeowners prefer a HELOC to avoid resetting their entire mortgage rate.
A HELOC (Home Equity Line of Credit) is a revolving credit line secured by your home’s equity — similar to a credit card, but with your home as collateral. You draw funds as needed during a draw period (typically 5–10 years) and pay interest only on what you’ve used. For ADU construction, this works well because you’re not sitting on a large lump sum earning nothing — you pull funds as your builder needs them through the construction process. HELOCs typically have variable rates, so they carry some interest rate risk if your build takes longer than expected.
A home equity loan is a lump-sum second mortgage at a fixed rate, repaid over a set term — usually 10 to 20 years. Unlike a HELOC, the rate and payment don’t change. It’s a good option if you want predictability and know your total construction budget upfront. The downside is that you’re paying interest on the full amount from day one, even if your builder hasn’t spent it all yet. For well-defined ADU projects with a firm fixed-price contract, home equity loans can be a clean, simple solution.
Yes — as ADU construction has grown nationally, some lenders have introduced loan products specifically designed for them. These can include renovation loans (like Fannie Mae’s HomeStyle or FHA’s 203k) that allow you to finance the ADU construction into a new or refinanced mortgage based on the after-renovation value of your property. The advantage is that the loan is sized based on what your home will be worth after the ADU is complete — not just what it’s worth today — which can unlock more financing than a traditional equity-based product. Not all Idaho lenders offer these, but we can connect you with those who do.
In some cases, yes. Certain loan products — particularly investment-focused products and some portfolio lenders — will allow you to use a percentage of projected rental income to offset your debt-to-income ratio, making it easier to qualify for a larger loan. Fannie Mae’s guidelines also allow rental income from an ADU to be counted in some refinance scenarios. This is lender-specific and depends on your overall financial profile, but it’s worth exploring if your DTI is tight. We can point you toward lenders in Idaho who take a flexible approach to ADU income qualification.
A well-designed 600–900 sq ft detached ADU in the Boise metro currently rents for approximately $1,200–$1,800/month depending on location, finish level, and whether utilities are included. In high-demand neighborhoods closer to downtown Boise or near BSU, rents can push higher. In Southern Idaho markets like Twin Falls, rents are somewhat lower but so are construction costs, and cap rates can actually be more favorable. We can share current comparable rental data for your specific area when we assess your project.
Generally yes, and often significantly. Lenders and appraisers increasingly recognize ADUs as value-adding improvements rather than simply an additional structure. In many Boise-area submarkets, a permitted, well-built ADU can add $100,000–$200,000 or more to a property’s appraised value — sometimes exceeding the cost to build it. This is important for financing because some loan products size the loan based on the projected completed value, which can give you access to more capital than your current equity alone would support.
Yes. We don’t just hand you a construction contract and wish you luck — we walk through the financing picture with you early, connect you with Idaho lenders who are active in ADU lending, and help you understand the numbers before you commit to anything. Our goal is to make sure your project pencils out financially before a single permit is pulled.
Reach out and tell us where your property is located. We’ll run a quick feasibility check — zoning, setbacks, utility access, rough construction budget — and give you an honest read on what’s buildable and what it’s likely to cost. From there, if the project makes sense, we’ll connect you with lending options and walk you through next steps. There’s no cost and no obligation for the initial review.
Schedule a free consultation with our ADU experts. We’ll assess your property, review your goals, and deliver a detailed, no-obligation estimate.
Serving Boise, Idaho and Surrounding Communities
