Prefab ADU
Best Sellers

Our Best-Selling Models

The three models our clients install most often. Proven layouts, honest timelines, and the fastest path from backyard to move-in.

HRG-101

258 ft²(24 m²)

Studio Cabin

From $100K · 10–14 weeks

1 Bed1 Bath
Overall Dimensions10'-10" × 23'-0" (3.3 m × 7.0 m)
Build yours

HRG-104

592 ft²(55 m²)

Compact Two-Bedroom

From $177K · 12–16 weeks

2 Beds1 Bath
Build yours

HRG-106

829 ft²(77 m²)

Modern Two-Bedroom

From $232K · 14–18 weeks

2 Beds1 Bath
Overall Dimensions29'-4" × 35'-9" (8.9 m × 10.9 m)
Build yours
Why These Three Sell

The same three reasons, every time

They're not our only models, but they're the ones clients keep coming back to. Here's the track record behind them.

120+
Units Installed
3–5 Days
Average On-Site Install
98%
Permit Approval Rate
4.9/5
Customer Satisfaction
Compare

Side by side, spec for spec

SpecStudio CabinCompact Two-BedroomModern Two-Bedroom
Square Footage258 ft²592 ft²829 ft²
Bedrooms1 Bed2 Beds2 Beds
Bathrooms1 Bath1 Bath1 Bath
Starting PriceFrom $100KFrom $177KFrom $232K
Build Timeline10–14 weeks12–16 weeks14–18 weeks
Best ForGuest suite, home office, or rental income on a small lot.Families, multigenerational living, or a high-demand rental.Max livable space per dollar, full-time residence or long-term rental.
How It Works

From first call to move-in

01

Consult & Design

We walk your lot, talk goals and budget, and design a unit that fits.

02

Permit & Engineer

We finalize engineering and handle permitting with your city or county.

03

Build Off-Site

Your unit is built in our facility while your site is prepped in parallel.

04

Deliver & Set

We deliver, set, and connect the unit, then walk you through final inspection.

From Our Clients

Built for them, set on time

"The Studio Cabin went into a corner of our yard we weren't using. It was set and finished in days, and now it pays for itself as a rental."
Daniel R.
Pasadena, CA
Studio Cabin
"We looked at three builders before choosing HRG. The Compact Two-Bedroom was exactly the size we needed, and the timeline was honest start to finish."
Maria & Tom L.
Glendale, CA
Compact Two-Bedroom
"The Modern Two-Bedroom felt like a real home, not a backyard box. Permitting was handled, install was clean, and we moved in ahead of schedule."
Priya S.
Northridge, CA
Modern Two-Bedroom
Frequently Asked

Questions before you decide

Once your foundation and utilities are ready, on-site assembly typically takes three to five days. The full project, from signed design to final inspection, runs 10 to 18 weeks depending on the model and your local permitting timeline.

Yes. We prepare the design documentation, engineering, and permit submission with your city or county as part of your project, and we manage inspections through final close-out.

You'll need a level pad with utility access (power, water, sewer or septic) and clearance for delivery and crane set. During your consultation we review setbacks, access routes, and any HOA rules that apply.

Yes. Every model can be tailored with siding and roofline options, interior finish packages, and layout tweaks. The three best sellers are popular precisely because they work well as-is, but they're not locked in.

We work with lending partners who specialize in ADU and addition financing. We're happy to make an introduction during your consultation so you can review options before committing.

No. The starting price is the low end of a complete project with base finishes: design, permits, materials, delivery, site work and assembly. Your lot and your finishes set the final number.

Ready to find your fit?