HOOLIEHAUSHouse Plans & 2D CAD Blueprints
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182 Modular / Prefab Cottage Floor Plans • 400–2,400 Sq Ft

Modular / Prefab Cottage Floor Plans & 2D Blueprints

Designed around highway-transportable module widths (14', 16', 24', 28', and 32' marriage-wall configurations) so homeowners can either stick-build on site or order from a regional modular factory.

Modular / Prefab Cottage 3D House Exterior
182 Plans
Shell Est: $47,500
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Shell Est: $20,000
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Shell Est: $21,500
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Shell Est: $22,500
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Shell Est: $25,500
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Shell Est: $25,500
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Shell Est: $28,500
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Shell Est: $28,500
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Shell Est: $19,000
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Shell Est: $22,000
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Shell Est: $23,500
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Shell Est: $25,000
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Modular / Prefab Cottage Build Cost Guide & Frequently Asked Questions

Shell kit pricing (~$44/sq ft), framing specifications (Factory-Engineered 2x6 Modular Box System w/ Marriage Wall) & common questions

Structural Framing, Roof Pitch & Foundation Specs

Designed around highway-transportable module widths (14', 16', 24', 28', and 32' marriage-wall configurations) so homeowners can either stick-build on site or order from a regional modular factory. Every modular / prefab cottage layout in this 182-plan hub is drafted on a true structural bay module (6" exterior walls, 4.5" interior partitions) using Factory-Engineered 2x6 Modular Box System w/ Marriage Wall. Standard builds pair a Stem Wall Crawlspace or Full Perimeter Foundation with a 5:12 Hinged 5:12 Architectural Shingle or Metal Gable Roof, eliminating complex roof valleys and reducing framing labor by 18% to 25%.

Shell Kit vs. Turnkey Budgeting & Plumbing Optimization

With dried-in shell pricing averaging $44/sq ft and turnkey builds averaging $158/sq ft, the fastest way to lower construction costs on a modular / prefab cottage is consolidating mechanical runs. Our compositional CAD engine groups kitchens, baths, and laundry rooms along shared plumbing wet walls and keeps clear 36-inch circulation paths around every doorway and kitchen island.

How much does a Modular / Prefab Cottage cost to build per square foot?

Across our 182 engineered modular / prefab cottage floor plans, dried-in structural shell packages average $44 per sq ft ($17,600 to $105,600 depending on footprint size), while complete turnkey construction averages $158 per sq ft of heated living space. The average turnkey build cost across this collection is $184,654.

What structural framing and foundation system is best for a Modular / Prefab Cottage?

Our modular / prefab cottage blueprints are engineered around Factory-Engineered 2x6 Modular Box System w/ Marriage Wall paired with a Stem Wall Crawlspace or Full Perimeter Foundation and a 5:12 Hinged 5:12 Architectural Shingle or Metal Gable Roof. All exterior walls are dimensioned at 6 inches with 4.5-inch interior partitions for straightforward permitting and local lumber or kit takeoff.

Are these Modular / Prefab Cottage floor plans compliant with IRC residential building codes?

Yes. Every modular / prefab cottage blueprint in the HoolieHaus StructuraCAD catalog is programmatically verified against 2024 International Residential Code (IRC) spatial standards—including R304 minimum room areas (70+ sq ft bedrooms, 7'-0" minimum width), R310 emergency egress window placement in all sleeping quarters, 36-inch main entry doors, and consolidated wet-wall plumbing cores.