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HomeAccessory Dwelling Unit Adu House PlansCharming 650 sq ft Carriage House with Spacious Garage and Deck

Charming 650 sq ft Carriage House with Spacious Garage and Deck

Plan #X5700-A · 650 sq ft · 1 bd · 1 ba · 2.0 story · 2-car

Accessory Dwelling Unit Adu House PlansNarrow House PlansTwo Story
★★★★★Read 687+ verified reviews →
Estimated cost to build the home
$100k – $165kFree zip estimate ↓
Have questions about this plan? Book a free plan review with David →
David Park · Residential Plan Advisor · 30+ years
650
Sq Ft
1
Beds
1
Baths
2.0
Stories
2
Garage
9′
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…
  • Working with a narrow lot — the design is just 31 ft 8 in wide
  • Need a 2-car garage for vehicles or workshop use (2-car garage with 9-ft ceilings)
  • Want outdoor living space (60 sq ft deck)
  • Seeking rental income or guest accommodation (complete ADU with kitchen and laundry)
  • Prefer laundry on the upper level for convenience (second-floor laundry)
! May not be the best fit if you…
  • Need more than one bedroom — this plan has only 1 bedroom
  • Require multiple bathrooms — this design includes just 1 bathroom
  • Want a single-story layout — this is a two-story plan with stairs
  • Need a large living footprint — the design is only 650 sq ft total
  • Prefer main-floor living — all living space is on the second floor

This plan tends to appeal to:

Narrow Lot OwnersAccessory Dwelling Unit BuildersRental Income SeekersUrban Infill DevelopersGuest House Builders
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 — 650 sq ft · 35.00′W × 35.00′D

↓ Free Sample
floor plan

Choose Your Package

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PDF Set
Build as-is or minor changes
$975
  • Complete working drawings (PDF)
  • Instant delivery to your email
  • Unlimited build license included
  • Copyright release — print as needed
  • AutoCAD DWG files not included
Chief Architect Files
$1,950
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed

About this plan

Spanning 650 square feet of heated living area, the Winthrop Adu is a specialized carriage house design that prioritizes compact efficiency and vertical utility. Measuring 31 feet 8 inches in width and 25 feet in depth, this two-story structure is engineered for narrow lots or properties requiring an accessory dwelling unit (ADU) with significant vehicle storage.

The upper level encompasses the entirety of the 650 square feet of living space, containing one bedroom, one full bathroom, and a kitchen. A dedicated keeping room provides a central gathering area, while an attached 60-square-foot deck expands the usable footprint for exterior access. The inclusion of a second-floor laundry area consolidates household management into the private living quarters.

The ground level is dedicated to a 650-square-foot, two-car garage, providing a high-capacity footprint for vehicle storage or a workshop. With 9-foot ceiling heights on both the first and second levels, the interior volume creates an open feel despite the compact floor plate. The design utilizes durable 2x6 wall framing, ensuring structural integrity for this multi-use building.

Architectural specifications include a 10:12 roof pitch and a maximum building height of 25 feet, resulting in a distinct roofline profile. This configuration is optimized for those seeking a rental income property, guest house, or personal retreat, ensuring maximum utility from a minimal land footprint.

Key Features: 1 bedroom, 1 bathroom, 2-car garage, 650 sq ft living area, 60 sq ft deck, 9-foot ceiling heights, 10:12 roof pitch, 2x6 exterior wall framing, carriage house configuration, accessory dwelling unit (ADU).

Review plan layouts, available CAD packages, and customization options for the Winthrop Adu to determine how this design fits your property needs.

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)650 sq ft
2nd Floor650 sq ft
Deck60 sq ft
Bedrooms1
Full Bathrooms1
Stories2.0
Width of House35′
Depth of House35′
Building Height25′
1st Floor9′
2nd Floor9′
Garage2-car, front-load
Garage Area650 sq ft
FoundationSlab
Wall Framing2x6
Roof Pitch10:12

Key Features

2.0-story layout
1 bedrooms · 1 full baths
9-ft ceilings on the main level
2-car garage
35.00′ × 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 #X5700-A
GARAGE · 650 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
$280k
Most common
Mid-range
$325k
Premium
$365k+
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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