1-bed attached
Upside Annex
The Upside Annex is a 600 sq ft one-bedroom ADU that shares a wall with your home, with a gabled board-and-batten exterior and a covered entry. Tying into the main home's nearby utilities cuts trenching and site work, so you add new purpose-built square footage while keeping most of the backyard open.
Best for: Lots with limited yard that still want a brand-new, full one-bedroom unit.
Delivered as a attached adu.
What's included
- New square footage attached to the main home
- Fire- and sound-rated shared wall for real privacy
- Private entrance on a separate elevation
- Short utility runs cut trenching cost vs. detached
- Covered porch, vaulted main room, in-unit laundry
Specifications
| Bedrooms | 1 |
|---|---|
| Bathrooms | 1 |
| Size | 600 sq ft |
| Starting price | $150,000 |
| Typical rent | $1,900–$2,500 / mo |
Specs are for the standard 1-bedroom configuration. Layout, finishes, and final size are confirmed during design and may vary with your lot.
Run your numbers
Estimate this model
The Upside Annex is pre-loaded below as a attached adu. Adjust size and city to see your turnkey cost, financed payment, and rental return.
Estimate your ADU
Ballpark 2026 turnkey cost, financing, and rental return for your area.
Estimated turnkey cost
$240–$340 / sq ft · incl. design, permits & construction
Estimates only — 2026 regional ranges, not a bid. Your real price depends on site conditions, finishes, and your lot. We confirm with a free feasibility check.
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Build the Upside Annex in your backyard
Tell us your lot and goals — we'll confirm this model fits, modify it where needed, and send a transparent, all-in quote.