17-1008 GARAGE PLAN – Colonial House Plan – 1-Bed, 1-Bath, 450 SF

Classic Colonial Carriage House Garage Apartment Plan

A timeless 1-bedroom, 1-bath, 450 sq. ft. garage apartment designed for flexibility, charm, and long-term value.

This thoughtfully designed carriage house garage apartment reflects the enduring appeal of Colonial and Traditional architecture, paired with modern functionality ideal for today’s homeowners. Whether used as a detached ADU, guest suite, rental unit, or private workspace, this plan delivers architectural consistency, efficient use of space, and strong curb appeal.

The balanced proportions, symmetrical window placement, and understated detailing give this structure a refined presence that integrates seamlessly into suburban neighborhoods, historic settings, or estate-style properties. Its compact footprint makes it especially attractive for backyard builds, alley-loaded lots, or properties requiring a secondary living structure.

Colonial-Inspired Exterior Design

The exterior is clad in horizontal lap siding, a hallmark of classic Colonial and Traditional homes. This material choice reinforces the home’s timeless character while remaining durable, low-maintenance, and cost-effective for long-term ownership.

• Clean horizontal lap siding for traditional curb appeal
• Symmetrical upper-level window arrangement
• Balanced massing reminiscent of historic carriage houses
• Neutral proportions that complement a wide range of main homes

The pitched roofline adds vertical emphasis while enhancing water shedding and durability. Subtle overhangs provide shadow depth without excessive ornamentation, keeping the structure architecturally authentic and visually grounded.

Main-Level Garage Functionality

The ground floor is dedicated to a two-car garage, offering flexible space for vehicles, storage, or workshop use. This level is intentionally separated from the living quarters above, making it ideal for rental applications or guest accommodations.

• Two full-size garage bays
• Space for vehicles, tools, recreational gear, or hobby use
• Clear structural spans for easy framing and modifications
• Durable exterior materials for everyday use

The garage layout supports multiple use cases, from traditional parking to mixed-use storage or light workshop needs, increasing the long-term versatility of the structure.

Private Exterior Stair Access

A dedicated exterior staircase along the side elevation provides direct access to the upper-level apartment. This design enhances privacy, improves usability for guests or tenants, and preserves the garage level for uninterrupted vehicle access.

• Separate entrance for the living quarters
• Ideal for ADU and rental compliance
• Improved privacy for occupants
• Efficient circulation without interior stair conflicts

This circulation strategy is especially beneficial for homeowners planning to use the unit as a long-term rental, short-term stay, or independent guest suite.

Upper-Level Living Quarters

The second floor contains a 450 sq. ft. living space designed for comfort, efficiency, and adaptability. Large front-facing windows bring in natural light, creating an open and welcoming atmosphere.

• One private bedroom with closet space
• Full bathroom with efficient layout
• Open living area suitable for seating, dining, or office use
• Flexible wall space for built-ins or storage solutions

The layout supports customization, including optional kitchenette additions, expanded storage, or workspace configurations. Its proportions make it suitable for both short-term stays and extended living arrangements.

Construction Efficiency & Energy Benefits

The straightforward geometry and traditional materials keep construction costs predictable while supporting energy efficiency. The compact envelope reduces heating and cooling demand, making the plan economical to operate year-round.

• Simple roof structure reduces framing complexity
• Compact footprint lowers energy consumption
• Proven siding materials offer long-term durability
• Efficient layout minimizes wasted square footage

This combination makes the plan appealing to homeowners focused on cost-effective construction without sacrificing architectural quality. For additional inspiration on carriage house architecture and adaptive reuse, see examples featured on ArchDaily.

Ideal Uses for This Carriage House Plan

• Detached ADU for rental income
• Guest house for visiting family
• In-law suite with privacy
• Home office or studio above garage
• Flexible backyard living solution

What’s Included with This Plan

This plan is delivered with a comprehensive package designed to simplify construction and reduce overall project costs:

• CAD and PDF construction files
• Unlimited build license
• Engineering included
• Foundation options available
• Modification discounts available

A Timeless Garage Apartment with Lasting Value

This Colonial carriage house garage apartment offers classic styling, practical living space, and unmatched flexibility. Its traditional exterior ensures long-term aesthetic appeal, while the efficient layout supports a wide range of modern living needs.

Whether built as an ADU, guest residence, or income-producing unit, this plan delivers dependable function wrapped in timeless architectural design.