400-500 Sq Ft House Plans

This is a collection of 300-500 Sq Ft House Plans and container homes that people build to use as vacation cabins or granny pods. The majority of tiny house floorplans are customizable and available for purchasing. We don’t recommend getting free small and tiny house plans unless you have a significant experience in house construction. Many of the modern house plans come with an estimated cost to build. Please, keep in mind that building material prices are steadily going up.
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349 Square Foot Pool House with a Wet Bar
If you need an entertainment oasis by the swimming pool, this open floor plan with a wet bar should draw your attention. A well-equipped bar features an under-the-counter refrigerator and a modern sink. Vaulted ceilings give this living room plenty of natural light.
The Signature House by ÖÖD
Get ready to be wowed by the clever Scandinavian design of this tiny modern prefab. The floor plan may seem simple, but it's straight to the point and brilliantly executed. The light-colored interior adds an extra touch of magic, making the space feel even larger and more open than its dimensions imply.
Modern Farmhouse Cottage Plan
This open modern farmhouse floor plan boasts 2 bedrooms and an open living/kitchen area that blurs boundaries between outdoors and indoors. Furthermore, large windows fill the interior with natural light, while offering breathtaking views of the country.
Single-Level DIY Granny Pod 'Lucas'
This portable single-level granny pod is an example of another affordable DIY project if you decide to build an ADU yourself. With a straightforward floor plan and an option for solar panels, it is the epitome of eco-friendly independent living. Also, add a 7-foot cozy deck for relaxation and enjoyment.
Adorable Backyard Cottage
Whether you want to build an artist's studio, a home office, or a tiny guest cottage, this 400 sqft space is an epitome of charm and functionality.
Backyard Office Kit (or Plans) by Coexist
As the demand for working from home continues to grow, architects at Coexist recognized the need for a backyard office that prioritizes not just productivity, but also overall well-being. That's why Coexist has taken a holistic approach to crafting the design of this kit.
Contemporary RV Garage with Apartment Above
If your in-laws love to travel in their RV and come to visit you, this plan is for you. Imagine a sleek, second-floor modern space with a 10'x10' bedroom and vaulted ceilings. The kitchen boasts ample space, overlooking a beautiful deck. Also, this detached RV garage has room for 2 cars and a space where you can park an RV.
4-season Yurt Cabin Kits
Historically speaking, yurts are portable large round houses with thin wooden frames used by the nomadic tribes. Are you a digital nomad who is ready for simpler, downsized life? Take a look at Freedom Yurt-Cabins. These hard-sided, four-season yurt-cabins make it possible to achieve your goals in just 3-5 days as the assembly is much faster and budget-friendly alternative to traditional home builds.
600 SQ.FT. Small Backyard ADU
Is ADU (Accessory Dwelling Unit) the same as a guest house? Though any properly designed ADU can be used as a guest house, not every backyard guest house will qualify as a legal ADU (for rental potential) if it doesn't meet the certain criteria. Nevertheless, this 600 sq. ft. plan with modern board and batten siding meets all the legal requirements for an ADU.
Corn Crib 2-bedroom Shed House Lucy
Among all cabin plans, this nostalgic-looking cabin packs a lot of functionality into 454 square feet. The plan provides a great room, a simple kitchen, and a bathroom area on the first floor. Due to the unique design of outward slanted walls, the second-floor loft area has enough space for 2 bedrooms.
530 sqft A-Frame Cabin with Loft Ruby
What can you build with a DIY building cost of $28,800? As an illustration, the complete set of plans lets you create a spacious 530 sqft cabin with a porch and a sleeping loft. The complete set of cabin plans (pdf) includes layouts, details, sections, elevations, a complete material list + tool list, eBook 'How to Build a Tiny House', and DIY furniture plans.
349 Square Foot Pool House with a Wet Bar
If you need an entertainment oasis by the swimming pool, this open floor plan with a wet bar should draw your attention. A well-equipped bar features an under-the-counter refrigerator and a modern sink. Vaulted ceilings give this living room plenty of natural light.
Modern Prefab Cabins under 600 sq.ft.
When it comes to small modern prefab cabins, their sleek design is not just about aesthetics; it also goes hand in hand with their energy efficiency. These cabins are carefully crafted to not only look stunning but to also minimize their environmental impact and maximize their energy-saving potential. From the materials used to the insulation techniques employed, every aspect of their construction is geared towards sustainability.
349 Square Foot Pool House with a Wet Bar
If you need an entertainment oasis by the swimming pool, this open floor plan with a wet bar should draw your attention. A well-equipped bar features an under-the-counter refrigerator and a modern sink. Vaulted ceilings give this living room plenty of natural light.