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20' × 30' Shell • 13 Floor Plans

20' × 30' Floor Plans (600 Sq Ft Base)

Compare 13 build-ready ways to configure a 20-foot by 30-foot structure—including all-living homes, shop-house splits, and 2-story lofts.

20x30 House Exterior
13 Plans
Shell Est: $28,000
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Shell Est: $28,000
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Shell Est: $28,000
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Shell Est: $40,000
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Shell Est: $40,000
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Shell Est: $27,000
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Shell Est: $27,000
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Shell Est: $26,000
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Shell Est: $26,000
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Shell Est: $29,500
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Shell Est: $29,500
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30' × 20'+ Shop Bay
Garage with Loft / Apartment AbovePlan HG-1171

601 Sq Ft (20x30) 1 Bed 1 Bath Garage with Loft / Apartment Above Floor Plan with Apartment Above

781
Sq Ft
1
Beds
1
Baths
420
Shop SF
Shell Est: $39,000
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20' × 30' Build Cost Guide, Nearby Sizes & FAQs

Slab takeoff, framing span notes, and comparable footprint sizes

Nearby Footprint Sizes:12'×32' (384 sf)14'×28' (392 sf)14'×32' (448 sf)14'×36' (504 sf)14'×40' (560 sf)16'×24' (384 sf)16'×28' (448 sf)16'×30' (480 sf)

20' Clear-Span Truss & Slab Engineering

A 20' × 30' rectangular building envelope (600 sq ft base area, 100 linear feet of exterior wall) is one of the most cost-effective structural modules in residential construction. Because the 20-foot width can be spanned by single-piece prefabricated wood roof trusses or cold-formed steel rafters, interior walls are non-load-bearing—allowing complete flexibility between open great rooms, split bedroom wings, and drive-in garage bays.

Material Takeoff Baseline (10 Cu. Yds. Concrete / 8 Roof Squares)

Every 4-corner 20x30 layout eliminates expensive hip-and-valley roof framing and minimizes foundation form corners. Builders typically budget 10 cubic yards of 4,000-PSI concrete for the monolithic slab, 85 exterior 2x6 studs (or 13 laminated post-frame columns at 8' o.c.), and 8 squares of standing-seam or ribbed metal roofing.

How many bedrooms and bathrooms fit inside a 20x30 (600 sq ft) floor plan?

A 20' × 30' building footprint (600 sq ft base area) comfortably supports 1 to 2 bedrooms and 1 bathroom in an open-concept ADU, tiny home, or cabin configuration. Browse all 13 vetted 20x30 floor plan variations above to compare room sizes.

How much concrete and roofing material does a 20x30 building require?

A 20' × 30' footprint has 100 linear feet of exterior perimeter wall. Pouring a 4-inch monolithic concrete slab with thickened perimeter grade beams requires approximately 10 cubic yards of ready-mix concrete. A standard gable roof with 18-inch overhangs requires roughly 8 roofing squares (800 sq ft of metal or shingle coverage).

What is the average cost to build a 20x30 house or barndominium?

Across our 13 engineered 20x30 blueprints, dried-in structural shell packages range from $18,000 to $28,800, while full turnkey construction averages $127,615 depending on whether the footprint is configured as all-living space or split between living quarters and an unheated shop bay.