Boise's Infill Housing Incentives: How to Maximize Density and Returns Without Sacrificing Profit
Most investors are overlooking great investment opportunities that are hiding in plain sight — and it's because they don't understand how Boise's new development code is opening up some of the best infill opportunities we've seen in decades.
Boise isn't just tolerating infill development anymore. The city is actively encouraging it, and they've built an entire point system to incentivize new housing. If you know how to stack these incentives, you can add density, cut costs, shrink your timeline, and increase your returns — all without sacrificing profit or taking on more risk.
Last week, we covered how the points system can be used for a minor land division by adding a small ADU that protects your rental income. This week, we're going deeper into the full incentive stack and how to use it to maximize density on your next deal.
The City's Incentive Point System, Explained
Boise's planning and zoning department has a handout — one you won't easily find laid out this clearly online — that shows exactly how developers earn and spend "points" in higher-density zones like R2, R3, and mixed-use districts. You earn points by meeting certain community benefit standards, and then you spend those points on specific development incentives.
How You Earn Points
Sustainable Housing (1 point). The easiest path is building to Silver LEED certification. Because modern building code already gets most projects close to that threshold, hitting Silver LEED status is often just a matter of insulation and water-usage upgrades — an incremental cost, not a redesign.
Affordability (2–4 points). In higher-density zoning, designating 10% of your permanent housing units as affordable earns 2 points; 20% earns 4. In lower density zoning, 25% of units designated as affordable earns you 4 points. On a property where you're building multiple units — say, splitting a lot into three and adding ADUs on each for up to nine total units — 10% affordable is just one small unit. If you design that unit to rent near market rate from the start, the "affordability" requirement often costs you nothing.
Affordability guidelines are tied to Area Median Income (AMI) and reset annually with inflation, so the amount you're allowed to charge actually increases every year. For rentals, tenants must make no more than 80% of AMI. For a for-sale unit, buyers must make no more than 120% of AMI, and the sales price can't exceed 95% of the area's median sales price — which many infill starter homes already fall under.
The tradeoff: affordability incentives come with a 50-year deed restriction. That's a long time horizon, so this strategy works best when you're already building small enough that the "affordable" rent or price is close to what you'd charge anyway.
How You Spend Points
Once you've earned points, here's what they can unlock:
Active use reduction — reduces required ground-floor commercial/active space in mixed-use buildings, freeing up room for parking or utility space
Permitted residential uses — allows detached single-family homes in zones (like R2, R3, MX1) where they're normally not permitted
Building height reduction or increase — go one story below the minimum, or exceed the maximum height by up to 10% to capture more square footage on a tight lot
Reduced minimum lot size and width — this is a big one. A lot that's technically too narrow or too small to split can often still be divided once this incentive is applied, unlocking an extra buildable lot
Reduced rear yard setback — useful for properties that need an alternative driveway configuration
Vehicle parking reduction — up to 50% off standard required parking (100% in MX4 zones). This alone has turned a 5-unit pencil into an 11-unit pencil on real projects
Vehicle parking maximum — lets you exceed a district's parking cap when a project genuinely needs more on-site parking
Bicycle parking reduction — reduces the long-term bike parking requirement (normally one spot per unit)
Minor land division — the ability to split up to four buildable parcels through an administrative process instead of the full preliminary/final plat subdivision process
Why the Minor Land Division Incentive Is a Big Deal
The minor land division incentive deserves its own callout. Going through a full subdivision means months of review in front of multiple city agencies. A minor land division is an administrative decision instead — saving three to six months on the front end alone.
It also often reduces physical requirements. On a recent deal, an existing sidewalk could stay in place instead of being torn out and replaced with a detached sidewalk, saving roughly $11,000 in hard costs — on top of the soft-cost and holding-cost savings from a shorter timeline.
R1 Zones: A Different Point Structure
R1A, R1B, and R1C — Boise's most common residential zoning, especially R1C — have their own version of the point system:
Sustainability earns 2 points (versus 1 in higher-density zones)
Affordability requires 25% of units (versus 10–20%) to earn 4 points, though this threshold can be reduced if the property falls within a "strategic infill location" (checkable via an address-lookup map on the city's site)
With enough points, R1A properties — where fourplexes aren't normally allowed — can be developed as fourplexes. A multifamily bonus can also permit 5+ units on a single lot where the project meets base zoning density, effectively doubling unit count on properties that would otherwise be capped.
Real Example: Adaptive Reuse of an Existing Church
One of the more creative applications of these incentives is adaptive reuse — converting an existing structure to housing. A current listing on our deal list is a former church, zoned R1C, that could convert to a 19-unit apartment building.
Adaptive reuse removes standard density limits and cuts parking requirements by 50%. Normally, R1C zoning would cap this property well under 19 units — using this incentive, that cap disappears. There's also room behind the church to build an additional cottage village.
The strategy: buy the church, begin renovations while entitling the cottage lots, then build and sell the cottages to pull your capital back out. What's left is a fully-owned, cash-flowing 19-unit apartment building with effectively none of your own cash still in the deal.
Running the numbers on this property: asking price is $1.69M. Selling everything outright nets roughly $850,000 in profit. But retaining the church while selling the 17 cottages gets all invested capital back out, plus an estimated $350,000 in profit — while the apartment building itself cash flows around $2,000/month, even with professional management factored in.
This Week's Deal: The Rim Premium in West Bench
This week's featured property sits on Boise's West Bench, along the rim above Garden City. Properties directly on that ridge — with unobstructed views of the foothills — sell at a significant premium over homes just across the street. In researching comparable sales, rim-facing homes were selling for roughly 30% more than nearly identical homes one block off the ridge.
The property: $475,000 asking price, 2,400 square feet, 4 bed/2 bath, previously undevelopable due to an access issue that has since been resolved. Two paths forward:
Keep the existing house, split two lots, build two new homes — approximately $415,000 in projected profit, about a 1.97x equity multiple and 26% annual IRR
Tear down and build four new homes on four lots — approximately $500,000 in projected profit, though it requires more up-front cash since it's treated as raw land
The Bottom Line
Boise's incentive point system isn't a loophole — it's a deliberate tool the city built to encourage more housing. Used correctly, it lets you add units, reduce parking and infrastructure costs, shorten entitlement timelines, and increase density on properties that wouldn't otherwise pencil — all without cutting corners or taking on outsized risk.
The catch is that almost every incentive is site-specific. What works on one lot doesn't necessarily work on the next, which is why running the numbers on the actual property — not just the code in the abstract — is what separates a deal on paper from a deal that closes.
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