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Expandable 3400 sq ft Craftsman House Plan with Optional Upper & Lower Levels – ~3,377 sq ft, 4–7 Bedrooms, 4.5–6.5 Bathrooms, 3-Car Garage

imorgani by imorgani
December 24, 2025
in House Designs
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Expandable 3400 sq ft Craftsman House Plan with Optional Upper & Lower Levels – ~3,377 sq ft, 4–7 Bedrooms, 4.5–6.5 Bathrooms, 3-Car Garage
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This Mountain-inspired Craftsman home plan offers approximately 3,377 sq ft of beautifully arranged living space on the main level, with thoughtful options to expand upward and downward for additional square footage as your needs grow.

The base design includes a comfortable open living core, a **first-floor primary suite**, **4 bedrooms**, and **4 full bathrooms + 1 half bath**, with opportunities to finish the upper level and lower level for up to **7 bedrooms** and multiple bath spaces.

The attached **3-car garage** and balanced exterior details give this home both practicality and aesthetic appeal, making it a strong choice for those seeking adaptable, everyday living with long-term flexibility.

Basement

Exterior & First Impressions

The exterior marries classic Craftsman detailing with relaxed mountain character. Balanced rooflines, a covered front porch, and a mix of traditional materials give the home both timeless charm and welcoming presence.

The generous porch space creates practical outdoor zones for seating, greeting guests, or enjoying morning coffee, while large, coordinated windows fill the interior with natural light and connect with surrounding views.

Open Main Level Living Core & Flow

Stepping inside, the home unfolds into a spacious open-concept shared core that unites the great room, dining area, and kitchen into one cohesive zone.

This layout enhances visibility and interaction across daily living spaces, making it easy to move from meal prep to social settings during meals or gatherings.

The kitchen sits at the heart of the shared zone with plenty of counter space, room for an island with casual seating, and intuitive access to both the dining area and outdoor porch. Efficient circulation and sightlines make the living core ideal for daily routines and hosting alike.

Primary Suite & Private Retreat

The **primary bedroom suite** occupies a private corner of the main level, offering a true retreat from the shared living zones. Its en-suite bathroom features dual vanities and thoughtful storage solutions — elements that support an easy, comfortable daily routine. Two walk-in closets further enhance storage capacity and everyday convenience.

Secondary Bedrooms & Flexible Room Use

Three additional bedrooms on the main level provide flexible space for family members, guests, or multifunctional needs such as home offices, studios, or hobby zones. These bedrooms are paired with full bathrooms, providing comfortable and private zones for occupants without interrupting the flow of shared spaces.

Upper Level Optional Expansion

One of the most compelling aspects of this design is the optional upper level, which can be finished to add extra bedrooms, bath spaces, and flexible living areas. Whether you choose to create additional bedrooms, a loft or bonus space, or expanded storage and recreation areas, this upper zone enhances the home’s adaptability as your needs evolve. citeturn0view0

Lower Level Optional Expansion

The lower level also has potential for additional finished space. By finishing the walkout lower level, you can significantly expand usable square footage with additional bedrooms, living zones, entertainment spaces, or even a home theater and recreational area — giving this home long-term flexibility for growing families, multigenerational living, or lifestyle changes. citeturn0view0

Indoor-Outdoor Living & Porch Areas

Outdoor living plays a meaningful role in this design. A covered front porch and rear porch zones extend the usable footprint beyond the interior walls, providing everyday spaces for casual seating, outdoor dining, or simply enjoying the landscape. The design encourages a seamless transition between interior comfort and outdoor relaxation, making it easy to embrace alfresco living through multiple seasons. citeturn0view0

Functional Features & Everyday Practicality

  • Open-concept shared living core that unifies great room, dining area, and kitchen for fluid everyday interaction.
  • Primary suite positioned for privacy with en-suite bathroom and walk-in closets.
  • Secondary bedrooms adaptable for family, guests, or multifunctional uses.
  • Optional upper level expansion for additional bedrooms, baths, or bonus spaces.
  • Optional lower level expansion offering significant additional living and entertainment zones.
  • Covered porch areas that expand usable living space outdoors.
  • Attached 3-car garage providing convenient parking and storage capacity.

Quick Specs

Feature Detail
Main Level Heated Area ~ 3,377 sq ft
Optional Lower Level ~ 2,799 sq ft
Optional Bonus ~ 473 sq ft
Total Potential ~ Up to ~6,650 sq ft (with finished upper & lower)
Bedrooms 4–7 (depending on finishes)
Bathrooms 4.5–6.5 (depending on finishes)
Stories Main level with optional upper and lower expansions
Garage 3-car attached

Estimated U.S. Build Cost

Typical U.S. residential construction costs in 2025 for a home of this size, with Craftsman character and options for expanded levels, range from about $175 to $350 per square foot, influenced by region, material quality, labor availability, site conditions, and finish levels. Based on that range, building just the main level (~3,377 sq ft) could cost approximately $592,000 to $1,182,000 USD before land purchase, site preparation, permits, utilities, and landscaping.

If you choose to finish the **upper and lower levels**, adding an estimated ~3,272 sq ft of additional space, total build costs could climb to approximately $1,155,000 to $2,305,000 USD or more depending on finish quality, mechanical systems, and custom features.

With **mid-range materials and standard finishes**, a practical build budget for the main living level would likely fall around $720,000 to $900,000 USD. Adding finished upper and lower levels with quality materials could bring total costs into the **$1.5 to $2 million USD** range.

Why This Plan Is Worth Considering

This Craftsman home design thoughtfully blends **open shared spaces, private retreats, and future-ready expansion capabilities** into a cohesive and adaptable layout. Its combination of everyday functionality, meaningful indoor-outdoor connections, and optional upper and lower levels makes it ideal for homeowners seeking both immediate comfort and long-term growth potential in a timeless architectural format.
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