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HomeAccessory Dwelling Unit Adu House PlansCompact 623 Sq Ft Carriage House with Office and Private Suite

Compact 623 Sq Ft Carriage House with Office and Private Suite

Plan #AD6406-A · 623 sq ft · 1 bd · 1 ba · 2.0 story · 2-car

Accessory Dwelling Unit Adu House PlansCarriage House Plans Garage Apartment Plans Adu DesignsCraftsmanTwo Story
★★★★★Read 687+ verified reviews →
Estimated cost to build the home
$95k – $155kFree zip estimate ↓
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David Park · Residential Plan Advisor · 30+ years
623
Sq Ft
1
Beds
1
Baths
2.0
Stories
2
Garage
10′
Ceilings
“We kept coming back to this plan — it just felt right for our family. The flow between the kitchen and living room works.”Verified buyer · Trustpilot
40+
Years in Business
3,000+
Plans in Catalog
10%
Beat Any Competitor Price
Expert
In-House Design Team
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Is this the right plan for you?

Most regret comes from buying a plan that doesn't fit your life. Skim this before you decide.

Great fit if you…
  • Working with a narrow or compact lot—the design measures just 22 ft by 26 ft 6 in
  • Need rental income or guest accommodation with a self-contained unit (1 bedroom, 1 bath)
  • Want a home office integrated into your living space (dedicated home office on second floor)
  • Prefer vertical efficiency over sprawl (two-story carriage house design)
! May not be the best fit if you…
  • Need multiple bedrooms for a growing family—this plan has only 1 bedroom
  • Want a single-level layout without stairs (two-story configuration)
  • Require significant outdoor space—the 623 sq ft footprint is compact
  • Need more than one full bathroom (single bathroom)

This plan tends to appeal to:

Accessory Dwelling Unit BuildersRental Property InvestorsWork-From-Home ProfessionalsDownsizersAcreage Owners
Think this is the one? Choose your package above and check out when you're ready.Yes — this plan fits me →

Floor Plans

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Main Level — 623 sq ft · 22.00′W × 35.00′D

↓ Free Sample
floor plan

Choose Your Package

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PDF Set
Build as-is or minor changes
$890
  • Complete working drawings (PDF)
  • Instant delivery to your email
  • Unlimited build license included
  • Copyright release — print as needed
  • AutoCAD DWG files not included
5 Prints
$990
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed
5 Prints + PDF
$995
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed
CAD Set
Significant modifications or custom design
$1,750
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed

About this plan

Adu 316 is a compact carriage house design that optimizes its 623 sq ft footprint by placing the primary living quarters above a 484 sq ft, 2-car front-load garage. Measuring 22 ft wide by 26 ft 6 in deep, this structure is engineered for narrow or compact lot configurations, providing a efficient vertical solution for rental income or private guest accommodation.

The first level consists of 59 sq ft of heated space, housing a dedicated mud room and entry point designed to manage traffic flow before ascending to the upper level. With 11-foot ceilings throughout the ground floor, the entry remains proportionally balanced, leading into the primary residential area located on the second floor.

Spanning 564 sq ft, the second floor serves as the core living environment. This level includes a full kitchen with an island, a designated home office, and a private bedroom suite. The 11-foot ceiling height in the living and bedroom zones creates a consistent vertical volume, ensuring the interior feels expansive despite the modest total square footage. An 8:12 roof pitch defines the upper profile, contributing to a total building height of 26 ft 5 in.

Constructed on a slab foundation with 2x4 framing, the design focuses on structural longevity and ease of build. The integration of the 2-car garage at the base allows the living space to remain elevated, providing better natural light penetration and separation from the utility zones. This carriage house configuration effectively separates automotive storage from the living environment while maintaining a small overall footprint.

Key Features: 623 sq ft total living area, 2-car front-load garage, 1 bedroom, 1 full bathroom, dedicated home office, kitchen island, 11-foot ceilings, slab foundation, 8:12 roof pitch, compact footprint.

Explore floor plans, available formats, and customization options for this design.

What's included in this plan
  • Exterior elevations (all sides)
  • Detailed floor plan(s) with dimensions
  • Foundation plan
  • Roof plan
  • Schematic electrical layout
  • Building cross-sections
  • General notes & specifications
Not included (handled locally)
  • Architectural / engineering stamps
  • Site & grading plan
  • Structural / framing calculations
  • Plumbing & HVAC layouts
  • Energy-compliance documents
  • Material take-off list
These are typically prepared by your local builder or engineer to meet your jurisdiction's requirements.

Complete Plan Specifications

Total Living (heated)623 sq ft
1st Floor59 sq ft
2nd Floor564 sq ft
Bedrooms1
Full Bathrooms1
Stories2.0
Width of House22′
Depth of House35′
Building Height26′5″
2nd Floor11′
Garage2-car, front-load
Garage Area484 sq ft
FoundationSlab
Wall Framing2x4
Roof Pitch8:12

Key Features

2.0-story layout
1 bedrooms · 1 full baths
2-car garage
22.00′ × 35.00′ footprint
Unlimited build license included
Copyright release — print as many copies as you need
Builder-friendly construction drawings

Modify This Plan

Free quote in 1–3 business days · In-house design team
In-house design team · Family-owned since 1983

Need a 4th bedroom, a different foundation, or 8 more feet of width?

Two quick steps. We'll reply with a fixed-price quote — no obligation, and no charge until you approve.

1–3 days
To send your quote
~2 wks
Typical revision time
Free
Until you approve
Direct
To the architect
1
Your contact
2
What to change
PLAN
Plan #AD6406-A
GARAGE · 623 sq ft · 1 bd / 1 ba / 2-car

First — where should we send your quote?

We only ask for what we need to get back to you. No address, no marketing.

Free quote — no charge until you approve·Direct to our in-house architect·40+ years modifying plans

What will this cost to build?

Most buyers are off by 20–30% before checking this.
Budget
$255k
Most common
Mid-range
$298k
Premium
$334k+
Modeled on Wichita, KS — our US price-baseline city. Use the form below to generate an exact estimate for your own location.
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Still deciding?

Book a free 15-min plan review with David Park.

David has 30+ years in residential design and construction documents. He'll walk through this plan with you — foundation options for your lot, modification possibilities, and exactly what's in the construction documents you'd receive. No pitch. No fee.


Reviews across all our plans — see plan-specific reviews on Trustpilot →

★★★★★

JoAnne and the entire staff was extremely helpful and patient with us while we decided between 2 homes. Outstanding curb appeal and a great layout perfect for us.

R
Rita Long · Milwaukee, WI
Plan: Cranberry Gardens
Verified buyer · Trustpilot
★★★★★

We've had an amazing experience with our new home. The customer service we received during our modifications was exceptional — they walked us through every change.

S
Sandra Hawkins · Montgomery, AL
Plan: Dunrobin Castle
Verified buyer · Trustpilot
★★★★★

We compared three plan sources and Archival's pricing + free design call won us over. Our builder said the construction docs were the cleanest he'd seen.

M
Mark Chen · Boise, ID
Plan: Pepperwood Place
Verified buyer · Trustpilot

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Frequently Asked Questions

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For most buyers, the PDF Set is the right choice — instant delivery, unlimited build license, and easy to share with your builder. If you plan significant modifications or are building in CA, OR, WA, or NV, go with CAD + PDF so your designer can edit the source files. Still not sure? Call (888) 890-2353 and a real person will help you choose.

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