Backyard ADU / Granny FlatPlan HG-1302
674 Sq Ft (24x28) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
674
Sq Ft
1
Beds
1
Baths
24x28
Shell
Shell Est: $31,000
24' × 28' Shell • 14 Floor Plans
24' × 28' Floor Plans (672 Sq Ft Base)
Compare 14 build-ready ways to configure a 24-foot by 28-foot structure—including all-living homes, shop-house splits, and 2-story lofts.
14 Plans
14 Plans
Backyard ADU / Granny FlatPlan HG-1303
674 Sq Ft (24x28) 2 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
674
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $31,000
Backyard ADU / Granny FlatPlan HG-1304
674 Sq Ft (24x28) 2 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan (Consolidated Wet-Wall + Open Great Room)
674
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $31,000
A-Frame CabinPlan HG-1305
966 Sq Ft (24x28) 1 Bed 1 Bath A-Frame Cabin Floor Plan with Loft
966
Sq Ft
1
Beds
1
Baths
24x28
Shell
Shell Est: $43,500
A-Frame CabinPlan HG-1306
966 Sq Ft (24x28) 2 Bed 1 Bath A-Frame Cabin Floor Plan with Loft
966
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $43,500
A-Frame CabinPlan HG-1307
966 Sq Ft (24x28) 2 Bed 1 Bath A-Frame Cabin Floor Plan with Loft (Cathedral Glass Gable + Overlooking Sleeping Loft)
966
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $43,500
Modern CabinPlan HG-1308
674 Sq Ft (24x28) 1 Bed 1 Bath Modern Cabin Floor Plan
674
Sq Ft
1
Beds
1
Baths
24x28
Shell
Shell Est: $30,000
Modern CabinPlan HG-1309
674 Sq Ft (24x28) 2 Bed 1 Bath Modern Cabin Floor Plan
674
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $30,000
Modern CabinPlan HG-1310
674 Sq Ft (24x28) 2 Bed 1 Bath Modern Cabin Floor Plan (Consolidated Wet-Wall + Open Great Room)
674
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $30,000
Modular / Prefab CottagePlan HG-1311
674 Sq Ft (24x28) 1 Bed 1 Bath Modular / Prefab Cottage Floor Plan
674
Sq Ft
1
Beds
1
Baths
24x28
Shell
Shell Est: $29,000
Modular / Prefab CottagePlan HG-1312
674 Sq Ft (24x28) 2 Bed 1 Bath Modular / Prefab Cottage Floor Plan
674
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $29,000
Modular / Prefab CottagePlan HG-1313
674 Sq Ft (24x28) 2 Bed 1 Bath Modular / Prefab Cottage Floor Plan (Consolidated Wet-Wall + Open Great Room)
674
Sq Ft
2
Beds
1
Baths
24x28
Shell
Shell Est: $29,000
24' × 28' Build Cost Guide, Nearby Sizes & FAQs
Slab takeoff, framing span notes, and comparable footprint sizes
24' × 28' Build Cost Guide, Nearby Sizes & FAQs
Slab takeoff, framing span notes, and comparable footprint sizes
Nearby Footprint Sizes:14'×32' (448 sf)14'×36' (504 sf)14'×40' (560 sf)16'×28' (448 sf)16'×30' (480 sf)16'×32' (512 sf)16'×36' (576 sf)16'×40' (640 sf)
24' Clear-Span Truss & Slab Engineering
A 24' × 28' rectangular building envelope (672 sq ft base area, 104 linear feet of exterior wall) is one of the most cost-effective structural modules in residential construction. Because the 24-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 (11 Cu. Yds. Concrete / 8 Roof Squares)
Every 4-corner 24x28 layout eliminates expensive hip-and-valley roof framing and minimizes foundation form corners. Builders typically budget 11 cubic yards of 4,000-PSI concrete for the monolithic slab, 88 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 24x28 (672 sq ft) floor plan?
A 24' × 28' building footprint (672 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 14 vetted 24x28 floor plan variations above to compare room sizes.
How much concrete and roofing material does a 24x28 building require?
A 24' × 28' footprint has 104 linear feet of exterior perimeter wall. Pouring a 4-inch monolithic concrete slab with thickened perimeter grade beams requires approximately 11 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 24x28 house or barndominium?
Across our 14 engineered 24x28 blueprints, dried-in structural shell packages range from $20,160 to $32,256, while full turnkey construction averages $143,071 depending on whether the footprint is configured as all-living space or split between living quarters and an unheated shop bay.