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30' × 40' Shell • 42 Floor Plans

30' × 40' Floor Plans (1,200 Sq Ft Base)

Compare 42 build-ready ways to configure a 30-foot by 40-foot structure—including all-living homes, shop-house splits, and 2-story lofts.

30x40 House Exterior
42 Plans
Shell Est: $36,500
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40' × 30'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1011

1,200 Sq Ft (30x40) 3 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop

780
Sq Ft
3
Beds
2
Baths
420
Shop SF
Shell Est: $32,500
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40' × 30'+ Shop Bay
BarndominiumPlan HG-1829

1,200 Sq Ft (30x40) 2 Bed 2 Bath Barndominium Floor Plan with Shop

781
Sq Ft
2
Beds
2
Baths
420
Shop SF
Shell Est: $36,500
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40' × 30'+ Shop Bay
BarndominiumPlan HG-1830

1,200 Sq Ft (30x40) 2 Bed 2 Bath Barndominium Floor Plan with Shop (Pull-Through Shop + Split Living Core)

750
Sq Ft
2
Beds
2
Baths
450
Shop SF
Shell Est: $36,500
View Plan
40' × 30'+ Shop Bay
BarndominiumPlan HG-1831

1,200 Sq Ft (30x40) 3 Bed 2 Bath Barndominium Floor Plan with Shop

780
Sq Ft
3
Beds
2
Baths
420
Shop SF
Shell Est: $36,500
View Plan
40' × 30'+ Shop Bay
BarndominiumPlan HG-1832

1,200 Sq Ft (30x40) 3 Bed 2 Bath Barndominium Floor Plan with Shop (Pull-Through Shop + Split Living Core)

750
Sq Ft
3
Beds
2
Baths
450
Shop SF
Shell Est: $36,500
View Plan
40' × 30'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1833

1,200 Sq Ft (30x40) 2 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop

781
Sq Ft
2
Beds
2
Baths
420
Shop SF
Shell Est: $32,500
View Plan
40' × 30'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1834

1,200 Sq Ft (30x40) 2 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop (Pull-Through Shop + Split Living Core)

750
Sq Ft
2
Beds
2
Baths
450
Shop SF
Shell Est: $32,000
View Plan
40' × 30'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1835

1,200 Sq Ft (30x40) 3 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop

780
Sq Ft
3
Beds
2
Baths
420
Shop SF
Shell Est: $32,500
View Plan
40' × 30'+ Shop Bay
Pole Barn Home (Post-Frame)Plan HG-1836

1,200 Sq Ft (30x40) 3 Bed 2 Bath Pole Barn Home (Post-Frame) Floor Plan with Shop (Pull-Through Shop + Split Living Core)

750
Sq Ft
3
Beds
2
Baths
450
Shop SF
Shell Est: $32,000
View Plan
Shell Est: $48,500
View Plan
Shell Est: $48,000
View Plan

30' × 40' Build Cost Guide, Nearby Sizes & FAQs

Slab takeoff, framing span notes, and comparable footprint sizes

Nearby Footprint Sizes:24'×40' (960 sf)24'×44' (1056 sf)26'×40' (1040 sf)28'×36' (1008 sf)28'×40' (1120 sf)28'×44' (1232 sf)28'×48' (1344 sf)30'×30' (900 sf)

30' Clear-Span Truss & Slab Engineering

A 30' × 40' rectangular building envelope (1,200 sq ft base area, 140 linear feet of exterior wall) is one of the most cost-effective structural modules in residential construction. Because the 30-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 (19 Cu. Yds. Concrete / 15 Roof Squares)

Every 4-corner 30x40 layout eliminates expensive hip-and-valley roof framing and minimizes foundation form corners. Builders typically budget 19 cubic yards of 4,000-PSI concrete for the monolithic slab, 119 exterior 2x6 studs (or 18 laminated post-frame columns at 8' o.c.), and 15 squares of standing-seam or ribbed metal roofing.

How many bedrooms and bathrooms fit inside a 30x40 (1,200 sq ft) floor plan?

A 30' × 40' building footprint (1,200 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 42 vetted 30x40 floor plan variations above to compare room sizes.

How much concrete and roofing material does a 30x40 building require?

A 30' × 40' footprint has 140 linear feet of exterior perimeter wall. Pouring a 4-inch monolithic concrete slab with thickened perimeter grade beams requires approximately 19 cubic yards of ready-mix concrete. A standard gable roof with 18-inch overhangs requires roughly 15 roofing squares (1,500 sq ft of metal or shingle coverage).

What is the average cost to build a 30x40 house or barndominium?

Across our 42 engineered 30x40 blueprints, dried-in structural shell packages range from $36,000 to $57,600, while full turnkey construction averages $201,345 depending on whether the footprint is configured as all-living space or split between living quarters and an unheated shop bay.