Small Lots, Entry Models
Four Fifty vs The 405
The Four Fifty is a 450 square foot studio with 1 bathroom, built in 4 months for $199,000. The 405 is a 405 square foot one bedroom, one bathroom model, built in 5 months for $239,000. Both use the same simple rectangle layout sized for small lots, so the real decision comes down to whether a separate bedroom is worth the extra time and cost.
At a Glance
| Four Fifty | The 405 | |
|---|---|---|
| Size | 450 sq ft | 405 sq ft |
| Bed / Bath | Studio / 1 Bath | 1 Bed / 1 Bath |
| All-Inclusive Price* | $199,000 | $239,000 |
| Typical Delivery | 4 months | 5 months |
| Footprint Shape | Rectangular | Rectangular |
| Best For | First ADUs, small lots, aging-in-place, a private studio for one. | Anyone who wants a real bedroom on a small lot. |
*Includes a permitting budget, not final permit costs. Permits and property-specific site work (septic, retaining walls, etc.) vary by property and are confirmed in your feasibility study. Every price also includes plans, foundation, the factory build, delivery, utility hookups, appliances, and final inspection.
Where the Four Fifty Wins
Pick the Four Fifty for this.
- ● Lowest price of the two at $199,000
- ● Fastest build at 4 months
- ● More overall square footage, 450 sqft, in an open studio layout
Where the The 405 Wins
Pick the The 405 for this.
- ● A true separate bedroom instead of one open room
- ● Still a 5 month build on a small lot footprint
- ● Best fit for anyone who wants a real bedroom over raw square footage
The Honest Verdict
How to actually decide.
If budget and speed come first, the Four Fifty gets you into a finished ADU sooner and cheaper. If a closed door between living space and sleeping space matters more than raw square footage, The 405 is worth the difference.
- Choose the Four Fifty if
- Choose the Four Fifty if your top priorities are the lowest price at $199,000 and the fastest 4 month build, and an open studio works for how the space will be used.
- Choose the The 405 if
- Choose The 405 if you want a real, separate bedroom on a small lot and are comfortable with a slightly longer 5 month timeline and a $239,000 price.
Compare More
Other model comparisons.
Still Deciding?
See which one actually fits your lot: the Four Fifty or the The 405.
Every property is different. Tell us your lot size, budget, and what you need the space for, and a real person on our team will tell you which model works, plus your exact price with permitting and site work factored in.
- A shortlist of which models actually fit your lot
- Honest flags on anything property-specific, like slope or septic
- A clear next step, whether that is a factory tour or a feasibility study
- No pressure, and no obligation
Once you submit, a real person on our team reviews your property and follows up within 1 to 2 business days to book your free 30-minute call. No call center, no drip campaign, just a conversation.
After we review your property, we'll invite you out to the factory, or send a member of our team to you, whichever fits your schedule better.
Building more than one? If you're a real estate developer or investor planning multiple units, let us know in the form. We offer better pricing at volume.
We respect your inbox and your phone. Message and data rates may apply, message frequency varies, reply STOP to opt out or HELP for help. See our Privacy Policy and Terms & Conditions.