Narrow side-yard lots
Boise infill lots and many North End and East End parcels are deeper than they are wide. The Osprey's layout fits along the side property line without forcing the dwelling to share a wall with the main house.
Type G-2 · Boise Pre-Approved · Studio + Garage
The Osprey — 376 sqft Studio ADU
Updated May 18, 2026
Sister plan to the Sandpiper — 376 sq ft studio + garage in a side-yard layout.
- Footprint
- 376 sqft
- Bedrooms
- Studio
- Plan Type
- Type G-2
- Starting At
- From $140k
What is the Osprey?
The Osprey is City of Boise's pre-approved Type G-2 plan — a 376 sq ft studio dwelling with attached single-car garage, laid out for narrow side-yard placement. From $140k turnkey at Essential finish. Sister plan to the Sandpiper with a different physical configuration to suit lots where front-back placement isn't workable. Same fast pre-approved permit path, same finish tiers.
The Osprey is Boise's second studio-plus-garage plan — 376 sq ft of dwelling with an integrated garage. Layout differs from the Sandpiper to suit different lot orientations. Pre-approved, fast-permitted, and built to the same Boise standards.
How much does the Osprey cost in Boise?
The The Osprey starts at From $140k turnkey at Essential finish. Final price depends on finish level and lot conditions. The table below shows total build cost ranges at three finish tiers — same per-square-foot math used in our cost calculator.
| Finish Tier | Per sqft | 376 sqft Total Range |
|---|---|---|
| Essential | $340/sqft | $115k – $143k |
| Standard | $405/sqft | $137k – $171k |
| Premium | $480/sqft | $162k – $202k |
Methodology: ranges reflect 2026 BoiseADU.com active job pricing. Includes site work, foundation, framing, MEP rough-in, insulation, drywall, roofing, siding, finish carpentry, cabinets, counters, flooring, fixtures, and paint. Excludes furniture, premium appliances, landscaping, and fences.
When the Osprey is the right pick
Lost-the-garage rebuild (narrow lots)
Same use case as the Sandpiper — rebuild a converted garage and add a rental — but for lots where the Sandpiper's footprint doesn't work.
Workshop + rental on tight lots
Owner workshop on one half, tenant studio on the other. Same shared-wall cost efficiency as the Sandpiper, but on lots that can't take the Sandpiper's orientation.
Privacy-focused garage-side rental
Garage between dwelling and main house creates a natural privacy buffer for the tenant — useful when the rental and the homeowner are sharing a tighter lot.
When another plan is a better fit
If you don't need a garage
The Goldfinch (280 sq ft, no garage, from $115k) is $25k cheaper for dwelling-only use cases. The Osprey is a combo play — worth it only if the garage is genuinely useful.
If your lot is wide enough for the Sandpiper
When both the Sandpiper and the Osprey would fit your lot, the Sandpiper's 396 sq ft (20 sq ft larger) edges out the Osprey for most use cases. The Osprey is the right choice specifically when the Sandpiper doesn't fit.
Cities where the Osprey works well
Boise-metro cities where this plan is among our top recommendations based on local zoning, lot sizes, and rental demand.
The Osprey vs The Sandpiper
The Sandpiper is the same studio + garage combo in a front-back layout (396 sq ft from $145k). Pick by lot orientation. If both fit, lean Sandpiper for the extra 20 sq ft. The Osprey wins specifically when narrow side-yard is the only viable placement.
The other 5 pre-approved plans
Type A · 280 sqft
The Goldfinch
The smallest pre-approved Boise ADU plan — a 280 sq ft studio that fits the tightest lots and the cleanest budgets.
From $115k →
Type B · 396 sqft
The Waxwing
A 396 sq ft studio with more breathing room — full living, kitchen, and bath in a thoughtfully laid-out single space.
From $135k →
Type C · 491 sqft
The Kingfisher
Boise's pre-approved 491 sq ft one-bedroom — separate bedroom, full kitchen, full living room, ready to permit.
From $170k →
Type D · 695 sqft
The Kestrel
The largest pre-approved Boise plan — a 695 sq ft two-bedroom that lives like a small house.
From $245k →
Type G-1 · 396 sqft
The Sandpiper
A 396 sq ft studio paired with a single-car garage — pre-approved, dual-purpose, builds your storage and your rental in one footprint.
From $145k →
The Osprey — frequently asked questions
When should I pick the Osprey over the Sandpiper?
When your lot is narrower than it is deep, or when the Sandpiper's front-back footprint doesn't fit setbacks. Boise's standard side-yard setback is 5 feet — the Osprey is laid out specifically for that constraint.
Why are there two studio + garage plans?
City of Boise approved both layouts because Boise lots vary widely in orientation. Front-back lots get the Sandpiper. Narrow side-yard lots get the Osprey. Same approval status, same permit timeline, both pre-approved.
Can the Osprey's garage be a workshop?
Yes — single-car garage size fits a workbench, tool storage, and one vehicle. Some homeowners use the garage exclusively as a workshop and rent the studio separately for full income.
How much smaller is the Osprey vs the Sandpiper?
20 sq ft — 376 vs 396. Functionally negligible inside the dwelling; the layout difference matters more than the square footage. Pricing also differs by about $5k.
What's the rental yield on an Osprey?
Studio rents in the $1,400-$1,700/mo range plus optional garage rental of $100-$200/mo. On a $140k Essential build, gross yield runs 12-16% if both are rented — comparable to the Sandpiper.
Ready to build the Osprey?
Free 24-hour estimate covering your lot, finish level, and final price for the The Osprey. Or call (208) 297-2036 to talk it through.