648-sq-ft-1bedroom-1bathroom-modern-cottage-house-plan

648 Sq Ft 1‑Bedroom 1‑Bathroom Modern Cottage House Plan

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Welcome to the Petaluma house plan, a charming and efficient home that blends modern design with cottage-style warmth.

With just 648 square feet, this plan makes the most of every inch, offering a bright and open space that’s perfect for cozy living, a creative getaway, or a stylish accessory dwelling unit (ADU).

Key Features at a Glance

  • Square Footage: 648 sq ft (all on one floor)
  • Bedrooms / Bathrooms: 1 & 1 full bath
  • Garage Bays: None (0 bays)
  • Ceiling Height: 9′ on main level
  • Foundation: Slab (default); also offers crawlspace, basement, walk-out basement options
  • Exterior Wall Construction: 2×4 wood frame (default); upgradeable to 2×6, post‑frame, CMU
  • Roof Type: Flat (0/12 pitch)
  • Home Dimensions: 24′ wide × 28′ deep; ridge height approx. 11′
  • Style: Modern Cottage ADU design—clean lines with cozy cottage character

Why This House Plan Stands Out

The Petaluma strikes an ideal balance between crisp modern design and the welcoming warmth of a cottage. Featuring a sleek stucco façade and a minimalist flat roofline, its architectural elegance looks stunning in a suburban backyard, on a rural lot, or as part of a backyard cottage suite.

And with giant windows and sliding glass doors, it feels more expansive than its size suggests.

Smart Layout for Everyday Living

This plan was designed for simplicity and flow. The open great room connects seamlessly to the kitchen, creating a comfortable living area that works for daily routines or small gatherings. A central island provides extra prep space and casual seating.

The bedroom includes built-in closets and sits next to a full bath with a tub-shower combo. Additional perks include a hallway closet and a laundry area with counter space for folding.

Designed with Style and Comfort in Mind

Natural light pours in through oversized windows, creating a bright, cheerful interior.

Every part of the home is thoughtfully arranged to avoid wasted space. From the kitchen to the bathroom, clean lines and smart storage make the home feel calm, uncluttered, and comfortable.

Perfect For…

  • Tiny-house enthusiasts craving a downsize without sacrificing style
  • Homeowners adding an ADU for guest housing, rental income, or office/studio space
  • Empty-nesters or singles seeking a manageable yet upscale primary home
  • Creative professionals needing a compact yet inspiring work-from-home environment

Imagine Living Here

Imagine waking up to a sun-filled bedroom, grabbing a coffee from your modern kitchen, and stepping into a living space that feels open and peaceful. Picture yourself relaxing in the great room with your favorite book, or opening the sliding glass doors to enjoy a quiet moment outside.

Whether you’re hosting a weekend guest or enjoying a quiet evening at home, the layout invites comfort and calm.

Ways to Make It Your Own

  1. Convert the laundry area or hall closet into a built-in studio nook—perfect for crafting or remote work.
  2. Add a deck or covered patio off the great room to enhance indoor-outdoor living and entertainment flow.
  3. Upgrade to taller 2×6 walls or post‑frame construction for better insulation or a more rustic aesthetic.
  4. Choose walk-out basement or crawlspace foundation to add storage or a future workshop.
  5. Request a mirrored/reversed plan set to suit lot orientation or enhance curb appeal.

Customizable Options & Kit Info

This plan includes a full PDF set with floor plans, elevations, roof layout, electrical plans, and cross sections. CAD file upgrades are available if you want to make modifications.

While it’s not a steel kit, the Petaluma can be adapted to your preferred construction method. Custom alteration quotes are also available from the design team.


Ready to Make Petaluma Yours?

If you’re looking for a compact, beautiful, and highly functional home, the Petaluma is a standout choice. Whether it’s your main residence, guest house, or rental unit, this plan delivers smart design with timeless appeal.

Visit the full house plan here to view layouts, request a quote, and get one step closer to bringing your vision to life.

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