Type C · 491 sqft 1-bedroom · Eagle, ID
The Kingfisher ADU in Eagle
A Kingfisher 1-bedroom ADU in Eagle starts at $170k turnkey and estimates to $1,800–$2,200/mo in rent — about 9.7–14.7% gross yield on a $179k–$223k Standard build. Here's how the 491 sq ft Type C plan fits Eagle lots, what it costs, and how fast it permits.
- Footprint
- 491 sqft
- From (Essential)
- $170k
- Est. Eagle rent
- $1,800–$2,200
- Gross yield
- 9.7–14.7%
Why the Kingfisher fits Eagle lots
The Kingfisher is one of our top picks for Eagle. The 491 sq ft 1-bedroom hits the sweet spot for Eagle long-term rentals and in-law suites. Bigger than a studio, easier to permit than a 2-bed, and the rent comps support it.
Eagle lots are larger than the Treasure Valley average — 90-120' wide is common in the established subdivisions, with 1/4-acre and larger lots in Eagle Hills and the Foothills. Generous buildable envelopes mean the Kestrel fits almost everywhere. Newer Floating Feather and Linder Road developments stay closer to 70-80' standard suburban widths.
Detached vs. garage in Eagle: Detached almost always wins in Eagle. Lots are large enough that the larger pre-approved plans (Kestrel, Kingfisher) fit cleanly, rental and resale value reward the configuration, and HOA architectural review prefers a freestanding accessory dwelling that visibly matches the main house over a garage conversion. The Kestrel is our most common Eagle pick.
What does a Kingfisher cost to build in Eagle?
The Kingfisher starts at $170k turnkey at Essential finish. Most Eagle owners build at Standard finish — $179k–$223k. Eagle carries the metro's highest rent ceiling but also its highest build cost — foothill lots trigger hillside review and grading, and design-review standards push exterior finish up.
| Finish Tier | Per sqft | 491 sqft in Eagle |
|---|---|---|
| Essential | $340/sqft | $150k – $187k |
| Standard | $405/sqft | $179k – $223k |
| Premium | $480/sqft | $212k – $264k |
Methodology: per-sqft rates match our cost calculator (Essential $340, Standard $405, Premium $480) with a 0.9–1.12 range factor for lot conditions. Build cost is roughly uniform across the Treasure Valley; what changes city-to-city is land, fees, the size cap, and the rent ceiling. See the full Eagle cost breakdown →
What rent and return does a Kingfisher earn in Eagle?
A 1-bedroom ADU like the Kingfisher estimates to $1,800–$2,200/month in Eagle. Against a Standard-finish build of $179k–$223k, that's roughly 9.7–14.7% gross yield — about $24,000 a year in gross rent at the midpoint, before expenses and financing.
Monthly rent (est.)
$1,800–$2,200
1-bedroom · Eagle
Annual gross (mid)
$24,000
12 × midpoint rent
Gross yield
9.7–14.7%
rent ÷ Standard build
Rent is scaled from Eagle's sourced 1-bedroom median (Apartment List Eagle, 2026) by unit size — a disclosed estimate, not a measured comp for this exact plan. Gross yield ignores vacancy, expenses, and debt service. This is information, not financial advice; validate with a local property manager before you build.
Permits and timeline for a Kingfisher in Eagle
Eagle layers city design review and (in most neighborhoods) HOA approval on top of the building permit, and many zones still require owner-occupancy — budget extra weeks versus a flat Boise lot.
Eagle's ADU rules emphasize compatibility with the primary residence and the surrounding neighborhood. Larger lots open up more siting options than you'd find in Boise, but the design review bar is higher — and HOA covenants in places like Banbury, Two Rivers, and Eagle Hills often go beyond what the city itself requires.
The Kingfisher is part of the City of Boise's pre-approved plan set, so it comes as a complete, already-engineered set of construction documents. That gives you a running start on review in Eagle (Ada County) — each city applies its own process, but a finished plan set clears review faster than a custom design.
The other 5 pre-approved plans in Eagle
Each pre-approved plan carries its own cost, rent, and lot fit in Eagle. Compare the full set for this city.
Type A · 280 sqft
Goldfinch in Eagle
The smallest pre-approved Boise ADU plan — a 280 sq ft studio that fits the tightest lots and the cleanest budgets.
$115k · est. $1,525–$1,875/mo →
Type B · 396 sqft
Waxwing in Eagle
A 396 sq ft studio with more breathing room — full living, kitchen, and bath in a thoughtfully laid-out single space.
$135k · est. $1,525–$1,875/mo →
Type D · 695 sqft
Kestrel in Eagle
The largest pre-approved Boise plan — a 695 sq ft two-bedroom that lives like a small house.
$245k · est. $2,300–$2,825/mo →
Type G-1 · 396 sqft
Sandpiper in Eagle
A 396 sq ft studio paired with a single-car garage — pre-approved, dual-purpose, builds your storage and your rental in one footprint.
$145k · est. $1,525–$1,875/mo →
Type G-2 · 376 sqft
Osprey in Eagle
Sister plan to the Sandpiper — 376 sq ft studio with garage, a different layout, same pre-approved status.
$140k · est. $1,525–$1,875/mo →
The Kingfisher in nearby Treasure Valley cities
Same plan, different local rent, cost, and zoning. See how the Kingfisher pencils out a short drive away.
Kingfisher in Eagle — frequently asked
How much does a Kingfisher ADU cost in Eagle?
The Kingfisher (491 sq ft, Type C) starts around $170k turnkey at Essential finish in Eagle. Most Eagle owners build at Standard finish — roughly $179k to $223k. Per-square-foot build cost is close to the Boise baseline; eagle carries the metro's highest rent ceiling but also its highest build cost — foothill lots trigger hillside review and grading, and design-review standards push exterior finish up.
What can you rent a Kingfisher for in Eagle?
A 1-bedroom ADU like the Kingfisher in Eagle estimates to about $1,800–$2,200 per month, scaled from Eagle's sourced 1-bedroom rent (Apartment List Eagle, 2026). On a Standard-finish build that's roughly 9.7–14.7% gross yield. These are estimates, not a rent guarantee — confirm with a local property manager.
How long does it take to permit a Kingfisher in Eagle?
Eagle layers city design review and (in most neighborhoods) HOA approval on top of the building permit, and many zones still require owner-occupancy — budget extra weeks versus a flat Boise lot. The Kingfisher is a complete City of Boise pre-approved plan set, so you start with finished, already-engineered construction documents — that shortens review in every Treasure Valley city versus a custom design, even though each city applies its own process.
Does the Kingfisher fit Eagle's ADU size limit?
Almost always. At 491 sq ft the Kingfisher is a compact footprint — Boise caps ADUs at 900 sq ft, and most Treasure Valley cities set their own limit (often a share of the primary home's floor area). The Kingfisher sits well under the typical cap, so in Eagle size is rarely the constraint — lot dimensions, setbacks, and access usually decide placement. We confirm Eagle's exact size rule for your parcel during the free lot check.
Eagle, Idaho · Type C
Build the Kingfisher in Eagle
Free 24-hour lot check covering plan fit, your Eagle zoning, cost, and the rent it could carry. Or call (208) 297-2036.