Which is bigger, the Four Fifty or the Five Five Five?

The Five Five Five is bigger at 555 sq ft, compared to 450 sq ft for the Four Fifty.

Which costs less, the Four Fifty or the Five Five Five?

The Four Fifty is the lower-priced option at $199,000, which includes a permitting budget along with plans, foundation, and delivery, compared to $279,000 for the Five Five Five. Exact permit costs are set by your city or county and confirmed in your feasibility study.

Which one delivers faster, the Four Fifty or the Five Five Five?

The Four Fifty has the shorter typical timeline at 4 months, compared to 5 months for the Five Five Five.

When should I choose the Four Fifty over the Five Five Five?

Choose the Four Fifty if you want the lowest price, the fastest timeline, and a simple private studio on a small lot.

When should I choose the Five Five Five over the Four Fifty?

Choose the Five Five Five if you want a true separate bedroom and more breathing room for a couple, a long-term tenant, or a guest house.

Studio vs One Bedroom

Four Fifty vs Five Five Five

The Four Fifty is a 450 square foot studio with 1 bath, built in about 4 months for $199,000. The Five Five Five steps up to 555 square feet with an actual bedroom and 1 bath, built in about 5 months for $279,000. Both use a simple rectangle layout, so the choice really comes down to how much separate room you want and how fast you need it.

At a Glance

	Four Fifty	Five Five Five
Size	450 sq ft	555 sq ft
Bed / Bath	Studio / 1 Bath	1 Bed / 1 Bath
All-Inclusive Price*	$199,000	$279,000
Typical Delivery	4 months	5 months
Footprint Shape	Rectangular	Rectangular
Best For	First ADUs, small lots, aging-in-place, a private studio for one.	Couples, long-term tenants, a guest house with room to breathe.

*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 point, $199,000
● Fastest build, about 4 months
● Private studio, ideal for small lots and aging-in-place

Where the Five Five Five Wins

Pick the Five Five Five for this.

● 555 sqft, 105 more than the Four Fifty
● A real separate bedroom, not a studio
● Built for couples and long-term tenants, room to breathe

The Honest Verdict

How to actually decide.

If a compact, standalone studio covers what you need, the Four Fifty gets you there faster and for less. If you want a bedroom that closes off from the living space, for a tenant, a guest, or a family member, the Five Five Five is worth the extra square footage and the extra month.

Choose the Four Fifty if: Choose the Four Fifty if you want the lowest price, the fastest timeline, and a simple private studio on a small lot.
Choose the Five Five Five if: Choose the Five Five Five if you want a true separate bedroom and more breathing room for a couple, a long-term tenant, or a guest house.

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Compare More

Other model comparisons.

Small Lots, Entry Models Four Fifty vs The 405 Studio Efficiency or a Real Bedroom? → One Bedroom, Two Sizes The 405 vs Five Five Five A Cozy Bedroom or Room to Breathe? → One Bed, One Bath, Two Sizes Five Five Five vs Six Sixty More Room to Breathe, or the All-Rounder Everyone Picks? → Same Footprint, One Bed or Two Six Sixty vs Six Sixty Duo One Bedroom or Two, Same 660 Square Feet? → Two Bedroom ADU Comparison Six Sixty Duo vs Seven Forty-Nine Compact and Efficient, or More Room to Spread Out? → Two Bedrooms, One Bath, Two Scales Seven Forty-Nine vs Eight Eighty-Five Duo More Privacy or More Room to Grow? →

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Still Deciding?

See which one actually fits your lot: the Four Fifty or the Five Five Five.

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
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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.

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