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-2Type G-2 · Boise Pre-Approved · Studio + Garage
The Osprey — 376 sqft Studio ADU
Sister plan to the Sandpiper — 376 sq ft studio + garage in a side-yard layout.
Updated May 18, 2026
- Footprint
- 376 sqft
- Bedrooms
- Studio
- Baths
- 1
- Plan Type
- Type G-2
- Permit timeline
- 3–5 wks
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.
Inside + Out
See the Osprey inside and out
Floor plan
The Osprey floor plan
The full dimensioned plan set — room layout, window and door schedule, and elevations — lives on Boise.gov as the official Type G-2 pre-approved set.
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 |
Roughly $1,170/mo on a 20-yr HELOC at ~8% APR. Run your own numbers →
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.
Included
In your turnkey price
- Site work & excavation
- Foundation
- Framing
- MEP rough-in (mechanical, electrical, plumbing)
- Insulation
- Drywall
- Roofing
- Siding
- Finish carpentry
- Cabinets & counters
- Flooring
- Fixtures
- Interior & exterior paint
Not included
Budget separately
- —Furniture
- —Premium appliance upgrades
- —Landscaping
- —Fences
- —Impact / SDC fees
- —Utility infrastructure upgrades
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.
Specifications
The Osprey specs
| Dimensions | |
|---|---|
| Square footage | 376 sqft |
| Building footprint | 32' × 20' |
| Layout | |
| Bedrooms | Studio |
| Bathrooms | 1 |
| Configuration | Studio + Garage |
| Plan type | Type G-2 |
| Permitting & build | |
| Permit path | Pre-approved · 3–5 weeks |
| Build window | 5–7 months typical |
| Pricing | Fixed-price turnkey |
| Builder | Construction by Iron Crest, RCE-6681702 |
The Osprey by city
Local cost, estimated rent, gross yield, and lot fit for the Osprey in each Treasure Valley market. It's one of our top picks in Star.
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 ASmallest
The Goldfinch
Smallest footprint, fastest permit, lowest entry cost.
- Sqft
- 280
- Beds
- Studio
- Baths
- 1
From $115k
Type BRental
Type C1-Bed
The Kingfisher
The landlord favorite — a real, walled-off bedroom.
- Sqft
- 491
- Beds
- 1
- Baths
- 1
From $170k
Type D2-Bed
Type G-1+ Garage
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.
Will the Osprey fit your lot?
Get a free desk feasibility review — setbacks, access, utilities, and Osprey plan fit on your specific lot. Or call (208) 297-2036 to talk it through.