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HomeAccessory Dwelling Unit Adu House PlansCozy 540 Sq Ft One Bedroom Garage Apartment Plan

Cozy 540 Sq Ft One Bedroom Garage Apartment Plan

Plan #AB6526-A · 540 sq ft · 1 bd · 1 ba · 2.0 story · 3-car

Accessory Dwelling Unit Adu House PlansCarriage House Plans Garage Apartment Plans Adu DesignsEuropean French Country House PlansTwo Story
★★★★★Read 687+ verified reviews →
Estimated cost to build the home
$80k – $135kFree zip estimate ↓
Have questions about this plan? Book a free plan review with David →
David Park · Residential Plan Advisor · 30+ years
540
Sq Ft
1
Beds
1
Baths
2.0
Stories
3
Garage
8′
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
Quick self-check · 30 seconds

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…
  • Need an accessory dwelling unit (ADU) for rental income or guest space (540 sq ft living area, separate from main home)
  • Want a workshop or hobby space — the 3-car garage provides 864 sq ft for vehicles, tools, or equipment
  • Working with limited lot space — the footprint is only 40 ft wide and 24 ft deep
  • Seeking a carriage house aesthetic with practical utility (French Country style with 3-car garage)
  • Plan to age in place with guest accommodations — second-floor master suite with full bath and keeping room
! May not be the best fit if you…
  • Need a full-size primary residence — this is a compact 540 sq ft one-bedroom unit
  • Want a basement or crawlspace — this plan uses a slab foundation only
  • Prefer a single-story layout — this is a two-story carriage house with stairs
  • Need multiple bedrooms for a family — this plan has only 1 bedroom

This plan tends to appeal to:

ADU BuildersRental Property InvestorsAcreage OwnersCar EnthusiastsHobby Farmers
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 — 540 sq ft · 40.00′W × 24.00′D

↓ Free Sample
floor plan

Choose Your Package

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PDF Set
Build as-is or minor changes
$1,155
  • Complete working drawings (PDF)
  • Instant delivery to your email
  • Unlimited build license included
  • Copyright release — print as needed
  • AutoCAD DWG files not included
PDF Multi-Build
$1,754
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed
CAD Set
Significant modifications or custom design
$1,830
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed
CAD Multi-Build
$2,429
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed

About this plan

40003 Garage Apartment provides 540 square feet of heated living area, utilizing a 40-foot by 24-foot footprint to maximize site efficiency. This carriage house plan serves as a versatile ADU or rental income property, featuring a compact two-story configuration that separates utility from residential space.

The second floor contains 540 square feet of finished living space, including a private bedroom, a full bathroom, and a keeping room. With 8-foot ceiling heights throughout the upper level, the layout maintains a consistent vertical scale that optimizes floor area for a live-work setup or guest accommodations.

The ground level is dedicated to an expansive 864 square foot garage with a 3-car capacity. This space supports various applications, such as a workshop or storage area, making it a robust solution for homeowners requiring additional hobby space. The garage level features 8-foot ceiling heights, ensuring adequate clearance for vehicle housing or workspace equipment.

Architectural specifications include a 12:12 roof pitch that contributes to a 23-foot 1-inch maximum building height. This steep roof geometry provides a classic carriage house aesthetic while allowing for the efficient second-floor living arrangement. The structure is designed to integrate into existing properties with a modest 40-foot width requirement.

Key Features: 540 sq ft living area, 864 sq ft 3-car garage, 1 bedroom, 1 full bathroom, 1 kitchen, 12:12 roof pitch, 23-foot 1-inch maximum building height, 8-foot ceiling heights, carriage house design, ADU configuration.

Explore floor plans, available formats, and customization options for the 40003 Garage Apartment.

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)540 sq ft
2nd Floor540 sq ft
Bedrooms1
Full Bathrooms1
Stories2.0
Width of House40′
Depth of House24′
Building Height23′1″
1st Floor8′
2nd Floor8′
Garage3-car, front-load
Garage Area864 sq ft
FoundationSlab
Wall Framing2x4
Roof Pitch12:12

Key Features

2.0-story layout
1 bedrooms · 1 full baths
8-ft ceilings on the main level
3-car garage
40.00′ × 24.00′ 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 #AB6526-A
GARAGE · 540 sq ft · 1 bd / 1 ba / 3-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
$301k
Most common
Mid-range
$349k
Premium
$391k+
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

→ Read all 687+ reviews on Trustpilot


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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Starting at
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