Plan HG-1613•Backyard ADU / Granny Flat•36' × 28' Footprint

1,009 Sq Ft (28x36) 3 Bed 2 Bath Backyard ADU / Granny Flat Floor Plan (Split-Bedroom Privacy Wing + Center Great Room)

1,009 sq ft heated living • 3 Bedrooms, 2 Baths • Free 2D CAD Blueprint (.SVG)

Download Free CAD (.SVG)

Room Dimensions & Zones

36' × 28' Shell

PRIMARY SUITE

187 sq ft

11'-0" × 17'-0"

EN-SUITE BATH

121 sq ft

11'-0" × 11'-0"

KITCHEN & ISLAND

188 sq ft

15'-0" × 12'-6"

GREAT ROOM

233 sq ft

15'-0" × 15'-6"

BEDROOM 2

160 sq ft

10'-0" × 16'-0"

HALL BATH

120 sq ft

10'-0" × 12'-0"

Build Cost Estimator

Estimated Cost to Build (36' × 28' Backyard ADU / Granny Flat)

Region:

Shell / Building Kit

$45,500 – $58,500

Framing package, roof trusses & exterior shell for 1,008 sq ft base.

Owner-Builder

$127,500 – $167,500

Saves ~$57,500 by managing local slab & interior trades.

Turnkey Builder

$185,000 – $225,000

Full general contractor finish including slab, HVAC, kitchen & baths.

Est. Monthly Payment

$1,064 / mo

$164,000 financed (30-Yr)

Down Payment:20%

Interest Rate:6.75%

Free Vector CAD Blueprint • Plan HG-1613

Download 36' × 28' Backyard ADU / Granny Flat Floor Plan (.SVG)

Scalable 2D architectural vector drawing with exterior and room dimensions, door swings, and fixture layout. Opens in AutoCAD, Illustrator, Inkscape, or any browser.

Material Takeoff & Framing Specifications

Concrete volume (20 yd³), roof surface (~1,164 sq ft), wall framing & architectural notes

Building Package	Specification	Quantity	Est. Range
Structural Shell & Trusses	36'×28' 2x6 Dimensional Lumber Framing / Panelized SIP Option	1,008 sq ft shell kit	$45,500 – $58,500
Concrete Slab & Grade Beams	Stem Wall or Monolithic Concrete Slab-on-Grade	20 Cubic Yards (4,000 PSI)	$9,500 – $12,250
Roofing & Underlayment	Architectural Standing-Seam Shed / Low-Slope Gable (3:12 Pitch)	14 Roofing Squares (1,400 sq ft)	$5,880 – $9,520
Closed-Cell Spray Foam / Insulation	3" Closed-Cell Wall & Roof Deck Thermal Envelope (R-21 to R-38)	7,126 Board Feet	$9,620 – $13,183
Windows & Exterior Doors	Low-E Argon Black Architectural Glazing + 36" Fiberglass Entry	4 Windows • 5 Doors	$3,800 – $6,020
HVAC & Multi-Zone Mini-Split	High-SEER2 Heat Pump / Ductless Mini-Split System	2 Ton (24,000 BTU/hr)	$5,200 – $8,200

Exterior Perimeter

128 Linear Ft

Interior Partitions

~112 Linear Ft

Est. Concrete Slab

20 Cubic Yards

Roof Deck Area

~1,164 Sq Ft

Plan HG-1613 (1,009 Sq Ft (28x36) 3 Bed 2 Bath Backyard ADU / Granny Flat Floor Plan (Split-Bedroom Privacy Wing + Center Great Room)) is an IRC R304/R310-vetted backyard adu / granny flat blueprint engineered around a 36'-0" × 28'-0" structural grid (1,008 sq ft base footprint, 0.78:1 Square-Bay Proportion). Configured on the Split-Bedroom Privacy Wing + Center Great Room topology, this layout delivers 1,009 sq ft of conditioned residential living area and 105 sq ft of covered outdoor porch deck.

Inside the conditioned envelope, the floor plan is organized into 6 distinct architectural zones: PRIMARY SUITE (11'-0" × 17'-0", 187 sq ft), EN-SUITE BATH (11'-0" × 11'-0", 121 sq ft), KITCHEN & ISLAND (15'-0" × 12'-6", 188 sq ft), GREAT ROOM (15'-0" × 15'-6", 233 sq ft), BEDROOM 2 (10'-0" × 16'-0", 160 sq ft), HALL BATH (10'-0" × 12'-0", 120 sq ft). Plumbing rough-ins are consolidated across EN-SUITE BATH, KITCHEN & ISLAND, HALL BATH to minimize sub-slab trenching and manifold pipe runs. Sleeping quarters (PRIMARY SUITE at 187 sq ft; BEDROOM 2 at 160 sq ft) are acoustically buffered from the primary living core and positioned on exterior elevations for code-compliant egress glazing.

From a builder takeoff standpoint, the 36' clear-span width utilizes 2x6 dimensional lumber framing / panelized sip option bearing on 128 linear feet of 6" exterior wall framing (~145 framing studs/posts) and 112 linear feet of interior partitions. The 3:12 architectural standing-seam shed / low-slope gable requires approximately 1,164 sq ft of roofing material (14 roofing squares), while the stem wall or monolithic concrete slab-on-grade pours at an estimated 20 cubic yards of 4,000-PSI concrete.

Frequently Asked Questions • Plan HG-1613

Building costs, foundation specs, egress & CAD customization questions

How much does it cost to build the 36x28 1,009 Sq Ft (28x36) 3 Bed 2 Bath Backyard ADU / Granny Flat Floor Plan (Split-Bedroom Privacy Wing + Center Great Room) (HG-1613)?

Based on current national residential construction data for backyard adu / granny flat structures, the dried-in structural shell for Plan HG-1613 (1,008 sq ft base footprint) ranges from $45,500 to $58,500 ($48/sq ft baseline). A complete turnkey build—including the 20-yard concrete foundation, 112 linear feet of interior framing, MEP rough-ins for 2 bath(s), and interior finishes across 1,009 sq ft of heated space—ranges from $185,000 to $225,000. Use the interactive Regional Cost Multiplier on this page to adjust for your local labor market and owner-builder sweat equity.

What are the exact room dimensions inside this 1,009 sq ft 3-bedroom layout?

Plan HG-1613 features 6 architecturally solved spaces inside its 36' × 28' footprint: PRIMARY SUITE (11'-0" × 17'-0", 187 sq ft), EN-SUITE BATH (11'-0" × 11'-0", 121 sq ft), KITCHEN & ISLAND (15'-0" × 12'-6", 188 sq ft), GREAT ROOM (15'-0" × 15'-6", 233 sq ft), BEDROOM 2 (10'-0" × 16'-0", 160 sq ft), HALL BATH (10'-0" × 12'-0", 120 sq ft). Every habitable room meets or exceeds IRC R304 minimum area (70+ sq ft) and minimum horizontal dimension (7'-0"+) requirements.

Can this 36' × 28' floor plan be built with post-frame, red-iron steel, or 2x6 stick framing?

Yes. Because the outer envelope is engineered on an even 36'-0" × 28'-0" structural grid (128 LF perimeter) with clear-span 3:12 trusses, a local structural engineer or building kit supplier can adapt the blueprint for 2x6 Dimensional Lumber Framing / Panelized SIP Option, conventional 2x6 stick framing at 16" o.c., laminated post-frame columns at 8' o.c., or structural insulated panels (SIPs).

What files are included in the free CAD blueprint download for Plan HG-1613?

Downloading Plan HG-1613 provides the high-resolution scalable vector floor plan (.SVG) with crisp architectural lineweights, exterior dimension strings (36'-0" × 28'-0"), room-by-room callouts, door swing arcs, and window schedules, plus instant browser printing for contractor bidding and preliminary municipal zoning review.