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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 or guest suite with its own entrance and full bathroom (540 sq ft apartment on second floor)
  • Want to add rental income to your property (carriage house designed for short-term or long-term rental)
  • Require a workshop or 3+ vehicle bays (3-car garage with 864 sq ft of open space for equipment)
  • Working with limited lot space — the compact 40 ft width and narrow 24 ft depth fit tight sites
  • Plan to age in place and need separate guest or in-law quarters (independent second-story unit)
! May not be the best fit if you…
  • Need multiple bedrooms in one unit — this plan has only 1 bedroom on the upper floor
  • Prefer a main-floor master suite — the bedroom is on the second story
  • Want a large primary residence — at 540 sq ft, this is designed as a compact ADU or carriage house
  • Require street-facing presence as your main home (garage-forward design may not suit primary dwellings)

This plan tends to appeal to:

Multi-Generational FamiliesShort-Term Rental InvestorsAging-in-Place BuyersAcreage OwnersHobby FarmersCar Enthusiasts
Think this is the one? Choose your package above and check out when you're ready.Yes — this plan fits me →

Floor Plans

Tap to zoom · Download sample

Main Level — 540 sq ft · 40.00′W × 24.00′D

↓ Free Sample
floor plan

Choose Your Package

Not sure? Call us — we'll help
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

Carriage House ADU with Workshop and 3-Car Garage

This 540 square foot carriage house plan combines a compact, two-story residential unit with a robust garage and workshop space, making it an ideal accessory dwelling unit or rental income property. The 40-foot by 24-foot footprint maximizes site efficiency, sitting on a slab foundation with a maximum building height of 23 feet 1 inch.

The second floor contains all finished living space: a bedroom, full bathroom, and keeping room with 8-foot ceiling heights throughout. The ground level features a 3-car garage spanning 864 square feet, with 8-foot clearance suitable for vehicles or workshop equipment. This split-use design separates utility from residential quarters, allowing for flexible applications such as a guest suite, in-law quarters, or short-term rental income property.

The 12:12 roof pitch contributes to classic carriage house aesthetics while accommodating the upper-level layout. This plan is engineered for integration into existing properties without consuming significant lot space, serving homeowners who need additional hobby space, vehicle storage, or flexible guest accommodations.

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

Can't find your answer? Call (888) 890-2353

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.

Still have questions about this plan? Talk to a real person — no pitch, no fee.

Starting at
$1,155
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