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20' × 40' Shell • 22 Floor Plans

20' × 40' Floor Plans (800 Sq Ft Base)

Compare 22 build-ready ways to configure a 20-foot by 40-foot structure—including all-living homes, shop-house splits, and 2-story lofts.

20x40 House Exterior
22 Plans
Shell Est: $25,500
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Shell Est: $25,500
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Shell Est: $26,000
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40' × 20'+ Shop Bay
BarndominiumPlan HG-1200

800 Sq Ft (20x40) 2 Bed 2 Bath Barndominium Floor Plan with Shop (Pull-Through Shop + Split Living Core)

501
Sq Ft
2
Beds
2
Baths
300
Shop SF
Shell Est: $25,500
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40' × 20'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1201

800 Sq Ft (20x40) 1 Bed 1 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop

520
Sq Ft
1
Beds
1
Baths
280
Shop SF
Shell Est: $23,000
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40' × 20'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1202

800 Sq Ft (20x40) 1 Bed 1 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop (Pull-Through Shop + Split Living Core)

502
Sq Ft
1
Beds
1
Baths
300
Shop SF
Shell Est: $23,000
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40' × 20'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1203

800 Sq Ft (20x40) 2 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop

521
Sq Ft
2
Beds
2
Baths
280
Shop SF
Shell Est: $23,000
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40' × 20'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1204

800 Sq Ft (20x40) 2 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop (Pull-Through Shop + Split Living Core)

501
Sq Ft
2
Beds
2
Baths
300
Shop SF
Shell Est: $23,000
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Shell Est: $33,000
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Shell Est: $33,000
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Shell Est: $37,500
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Shell Est: $37,500
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20' × 40' Build Cost Guide, Nearby Sizes & FAQs

Slab takeoff, framing span notes, and comparable footprint sizes

Nearby Footprint Sizes:14'×40' (560 sf)16'×36' (576 sf)16'×40' (640 sf)18'×32' (576 sf)18'×36' (648 sf)20'×20' (400 sf)20'×24' (480 sf)20'×28' (560 sf)

20' Clear-Span Truss & Slab Engineering

A 20' × 40' rectangular building envelope (800 sq ft base area, 120 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 (13 Cu. Yds. Concrete / 10 Roof Squares)

Every 4-corner 20x40 layout eliminates expensive hip-and-valley roof framing and minimizes foundation form corners. Builders typically budget 13 cubic yards of 4,000-PSI concrete for the monolithic slab, 102 exterior 2x6 studs (or 15 laminated post-frame columns at 8' o.c.), and 10 squares of standing-seam or ribbed metal roofing.

How many bedrooms and bathrooms fit inside a 20x40 (800 sq ft) floor plan?

A 20' × 40' building footprint (800 sq ft base area) comfortably supports 1 to 3 bedrooms and 1 to 2 bathrooms, or a 1-to-2 bedroom layout with an integrated garage/workshop bay. Browse all 22 vetted 20x40 floor plan variations above to compare room sizes.

How much concrete and roofing material does a 20x40 building require?

A 20' × 40' footprint has 120 linear feet of exterior perimeter wall. Pouring a 4-inch monolithic concrete slab with thickened perimeter grade beams requires approximately 13 cubic yards of ready-mix concrete. A standard gable roof with 18-inch overhangs requires roughly 10 roofing squares (1,000 sq ft of metal or shingle coverage).

What is the average cost to build a 20x40 house or barndominium?

Across our 22 engineered 20x40 blueprints, dried-in structural shell packages range from $24,000 to $38,400, while full turnkey construction averages $139,750 depending on whether the footprint is configured as all-living space or split between living quarters and an unheated shop bay.