Backyard ADU / Granny FlatPlan HG-1450
780 Sq Ft (26x30) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
780
Sq Ft
1
Beds
1
Baths
26x30
Shell
Shell Est: $36,000
26' × 30' Shell • 14 Floor Plans
26' × 30' Floor Plans (780 Sq Ft Base)
Compare 14 build-ready ways to configure a 26-foot by 30-foot structure—including all-living homes, shop-house splits, and 2-story lofts.
14 Plans
14 Plans
Backyard ADU / Granny FlatPlan HG-1451
780 Sq Ft (26x30) 2 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
780
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $36,000
Backyard ADU / Granny FlatPlan HG-1452
780 Sq Ft (26x30) 2 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan (Consolidated Wet-Wall + Open Great Room)
780
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $36,000
A-Frame CabinPlan HG-1453
1,125 Sq Ft (26x30) 1 Bed 1 Bath A-Frame Cabin Floor Plan with Loft
1,125
Sq Ft
1
Beds
1
Baths
26x30
Shell
Shell Est: $50,500
A-Frame CabinPlan HG-1454
1,125 Sq Ft (26x30) 2 Bed 1 Bath A-Frame Cabin Floor Plan with Loft
1,125
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $50,500
A-Frame CabinPlan HG-1455
1,125 Sq Ft (26x30) 2 Bed 1 Bath A-Frame Cabin Floor Plan with Loft (Cathedral Glass Gable + Overlooking Sleeping Loft)
1,125
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $50,500
Modern CabinPlan HG-1456
780 Sq Ft (26x30) 1 Bed 1 Bath Modern Cabin Floor Plan
780
Sq Ft
1
Beds
1
Baths
26x30
Shell
Shell Est: $34,500
Modern CabinPlan HG-1457
780 Sq Ft (26x30) 2 Bed 1 Bath Modern Cabin Floor Plan
780
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $34,500
Modern CabinPlan HG-1458
780 Sq Ft (26x30) 2 Bed 1 Bath Modern Cabin Floor Plan (Consolidated Wet-Wall + Open Great Room)
780
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $34,500
Modular / Prefab CottagePlan HG-1459
780 Sq Ft (26x30) 1 Bed 1 Bath Modular / Prefab Cottage Floor Plan
780
Sq Ft
1
Beds
1
Baths
26x30
Shell
Shell Est: $33,000
Modular / Prefab CottagePlan HG-1460
780 Sq Ft (26x30) 2 Bed 1 Bath Modular / Prefab Cottage Floor Plan
780
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $33,000
Modular / Prefab CottagePlan HG-1461
780 Sq Ft (26x30) 2 Bed 1 Bath Modular / Prefab Cottage Floor Plan (Consolidated Wet-Wall + Open Great Room)
780
Sq Ft
2
Beds
1
Baths
26x30
Shell
Shell Est: $33,000
26' × 30' Build Cost Guide, Nearby Sizes & FAQs
Slab takeoff, framing span notes, and comparable footprint sizes
26' × 30' 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'×30' (540 sf)18'×32' (576 sf)18'×36' (648 sf)20'×28' (560 sf)20'×30' (600 sf)
26' Clear-Span Truss & Slab Engineering
A 26' × 30' rectangular building envelope (780 sq ft base area, 112 linear feet of exterior wall) is one of the most cost-effective structural modules in residential construction. Because the 26-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 26x30 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, 95 exterior 2x6 studs (or 14 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 26x30 (780 sq ft) floor plan?
A 26' × 30' building footprint (780 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 26x30 floor plan variations above to compare room sizes.
How much concrete and roofing material does a 26x30 building require?
A 26' × 30' footprint has 112 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 26x30 house or barndominium?
Across our 14 engineered 26x30 blueprints, dried-in structural shell packages range from $23,400 to $37,440, while full turnkey construction averages $165,071 depending on whether the footprint is configured as all-living space or split between living quarters and an unheated shop bay.