Best prefab ADUs under $100k
Under $100k delivered is achievable on a serviced lot with decent access. It is not achievable on raw land, and it is not achievable at all with a unit your county will not permit. These four are the credible candidates.
#1Best ADU overallShippingBoxabl Casita
At the low end of its delivered range it lands right around $95k on a serviced lot near the factory's shipping radius, and it is the one unit here with a certification a planning department will accept. Distance from Las Vegas is the biggest variable in your quote.
- Base
- $60,000
- Delivered est.
- $95,000 – $175,000
- Deployed
- 361 sq ft
- Setup
- Roughly 1 hour to unfold and about a day to be move-in ready; utilities and inspection still take days to weeks
#2Best value ADUShippingProjected / UnconfirmedPackPrefab Flip Lite
430–455 deployed sq ft at a transparent $44,600, comfortably under $100k delivered. Published wind, seismic and fire ratings — but no certification seal, so its ADU eligibility depends entirely on whether your county will accept the engineering. Confirm before you deposit.
- Base
- $44,600
- Delivered est.
- $55,000 – $85,000
- Deployed
- 455 sq ft
- Setup
- About 8 hours with two workers
#3Best ADU to actually live inShippingProjected / UnconfirmedBrette Haus Compact
Only squeezes under $100k with favourable freight, but the CLT structure makes it the most pleasant unit on this list to spend a winter in. No US certification is confirmed — the permitting work falls to you.
- Base
- $33,000
- Delivered est.
- $70,000 – $120,000
- Deployed
- 291 sq ft
- Setup
- About 3 hours to unfold with a crane and a small crew
#4Budget option, with a caveatShippingProjected / UnconfirmedChery Industrial 19 ft × 20 ft Expandable House
A fraction of the delivered cost of anything else here, and in most jurisdictions it cannot legally be your ADU. Include it only if your county explicitly accepts uncertified structures — and plan for an electrician to finish the hookups.
- Base
- $23,990
- Delivered est.
- $29,000 – $55,000
- Deployed
- 380 sq ft
- Setup
- Quick assembly — hours to about a day with a small crew and equipment (not precisely specified)
How we ranked these
Included only where the low end of our delivered-cost estimate falls under $100,000 on a serviced lot, and where a certification path to permitted ADU placement exists or is plausibly obtainable.
Read our full methodology and independence statement →The 2026 Foldable Home Buyer’s Guide
Real delivered costs, state by state: freight, site work, utilities, permits and the certification label that decides whether your unit is a home or a shed.
Frequently asked questions
- How much does a Boxabl actually cost delivered?
- The Casita's base price is around $60,000. A realistic delivered-and-installed figure in the US is $95,000 to $140,000 once you add freight, crane, site work, an engineered pad, utility connections and permits. On raw land with no services, the top of that range is the honest planning number. Anyone quoting you a turnkey Casita at the base price is leaving something out.
- What is the cheapest foldable home you can actually buy?
- Expandable container buildings sell in the US from roughly $20,000 on marketplaces, and brand-name US sellers like Chery Industrial now start closer to $30,000, sometimes available from stock. They are legitimate portable buildings — excellent jobsite offices, studios and farm structures. They are not certified dwellings in most counties, so if your plan is to live in one full-time on a permitted lot, the real cheapest option is a certified unit at two to three times that price.
- Are the expandable container homes on Amazon any good?
- As portable buildings, some are perfectly fine — a galvanized-steel frame with foam-panel walls that unfolds into 380–800 sq ft for a low price, useful as an office, studio, guest room or short-stay unit. As dwellings, they are a problem: none of the Amazon-sold units in our catalog (Feekercn, EROMMY) carries a verified residential certification, so most jurisdictions will not permit them as a residence, and warranty and support are retail-grade. Buy one for what it is, plan for import logistics and an electrician, and do not mistake a low sticker price for a low-cost home.
- Can I put a foldable home on raw land?
- Physically yes, but the site work is where the budget goes. Raw land with no services means you pay for access, clearing and grading, a foundation, and — the big one — utilities, where a septic system alone can exceed $20,000. On the cheapest units the site work frequently costs more than the building. Plan on roughly base price × 2.2 for an unserviced site, and confirm your parcel is zoned for a dwelling and can pass a septic/perc test before you buy either the land or the unit.
- What is the Boxabl Baby Box?
- A small towable Boxabl launched around $19,999, with a wet bath and kitchenette in roughly 120 sq ft, aimed at offices, studios and guest rooms rather than full dwellings. It is SUV-towable and off-grid capable, but it is RV-classed rather than a permitted dwelling, and several specs — folded dimensions, certification and warranty — remain unconfirmed by Boxabl. Treat it as a preorder with projected numbers, not a shipping product you can pin down today.