Backyard ADU / Granny FlatPlan HG-1002
602 Sq Ft (20x30) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
602
Sq Ft
1
Beds
1
Baths
20x30
Shell
Shell Est: $28,000
Curated Collection • 18 Floor Plans
600 Sq Ft ADU Granny Flat Floor Plans (1 Bed, 1 Bath)
Code-compliant 20x30 and 600 sq ft backyard ADU and granny flat layouts with consolidated wet walls, accessible 36-inch doors, full kitchens, and covered porches.
25 Plans
25 Plans
Backyard ADU / Granny FlatPlan HG-1047
322 Sq Ft (16x20) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
322
Sq Ft
1
Beds
1
Baths
16x20
Shell
Shell Est: $15,000
Backyard ADU / Granny FlatPlan HG-1050
386 Sq Ft (16x24) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
386
Sq Ft
1
Beds
1
Baths
16x24
Shell
Shell Est: $18,500
Backyard ADU / Granny FlatPlan HG-1052
450 Sq Ft (16x28) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
450
Sq Ft
1
Beds
1
Baths
16x28
Shell
Shell Est: $21,500
Backyard ADU / Granny FlatPlan HG-1057
482 Sq Ft (16x30) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
482
Sq Ft
1
Beds
1
Baths
16x30
Shell
Shell Est: $23,000
Backyard ADU / Granny FlatPlan HG-1062
512 Sq Ft (16x32) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
512
Sq Ft
1
Beds
1
Baths
16x32
Shell
Shell Est: $24,500
Backyard ADU / Granny FlatPlan HG-1068
578 Sq Ft (16x36) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
578
Sq Ft
1
Beds
1
Baths
16x36
Shell
Shell Est: $27,500
Backyard ADU / Granny FlatPlan HG-1082
640 Sq Ft (16x40) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
640
Sq Ft
1
Beds
1
Baths
16x40
Shell
Shell Est: $30,500
Backyard ADU / Granny FlatPlan HG-1098
432 Sq Ft (18x24) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
432
Sq Ft
1
Beds
1
Baths
18x24
Shell
Shell Est: $20,500
Backyard ADU / Granny FlatPlan HG-1103
504 Sq Ft (18x28) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
504
Sq Ft
1
Beds
1
Baths
18x28
Shell
Shell Est: $24,000
Backyard ADU / Granny FlatPlan HG-1108
540 Sq Ft (18x30) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
540
Sq Ft
1
Beds
1
Baths
18x30
Shell
Shell Est: $25,500
Backyard ADU / Granny FlatPlan HG-1113
576 Sq Ft (18x32) 1 Bed 1 Bath Backyard ADU / Granny Flat Floor Plan
576
Sq Ft
1
Beds
1
Baths
18x32
Shell
Shell Est: $27,500
600 Sq Ft 1-Bed 1-Bath ADU — Build Cost Guide & FAQs
Planning tips, cost estimates, and related floor plan collections
600 Sq Ft 1-Bed 1-Bath ADU — Build Cost Guide & FAQs
Planning tips, cost estimates, and related floor plan collections
Spatial Layout & Structural Bay Optimization
Code-compliant 20x30 and 600 sq ft backyard ADU and granny flat layouts with consolidated wet walls, accessible 36-inch doors, full kitchens, and covered porches. Each of the 18 blueprints curated in this search silo has been solved on a true structural grid with zero dead-space corridors, consolidated wet-wall plumbing cores, and verified furniture/appliance clearance zones.
Comparing Shell Kits, Financing & Contractor Takeoffs
With an average turnkey build estimate of $126,917 across this collection, homeowners and builders frequently compare pre-engineered shell packages against local stick-frame lumber takeoffs. Select any blueprint above to customize regional labor multipliers, review concrete and stud quantities, and download the vector CAD drawing.
What makes these 600 sq ft adu granny flat floor plans (1 bed, 1 bath) IRC code-compliant?
All 18 blueprints in the "600 Sq Ft 1-Bed 1-Bath ADU" collection are verified by our spatial solver for IRC R304 minimum room dimensions, R310 bedroom emergency egress windows, 36-inch clear entryways, and unobstructed doorway swing clearances—scoring 100/100 on our automated CAD geometric audit.
What is the average turnkey cost for 600 sq ft 1-bed 1-bath adu?
Across the 18 matching floor plans on this page, the average turnkey construction cost is $126,917. Every individual blueprint page includes an interactive regional cost estimator and full structural material takeoff so you can compare shell-only vs. turnkey pricing.
Can I download the scalable CAD vector files (.SVG) for free?
Yes. Click any floor plan card above to open its interactive CAD blueprint viewer, inspect exact room-by-room dimensions and builder material takeoffs, and download the scalable vector CAD file (.SVG) and printable spec sheet at no cost.