Plan HG-1864•Modular / Prefab Cottage•40' × 30' Footprint

1,201 Sq Ft (30x40) 3 Bed 2 Bath Modular / Prefab Cottage Floor Plan (Split-Bedroom Privacy Wing + Center Great Room)

1,201 sq ft heated living • 3 Bedrooms, 2 Baths • Free 2D CAD Blueprint (.SVG)

Download Free CAD (.SVG)

Room Dimensions & Zones

40' × 30' Shell

PRIMARY SUITE

216 sq ft

12'-0" × 18'-0"

EN-SUITE BATH

144 sq ft

12'-0" × 12'-0"

KITCHEN & ISLAND

221 sq ft

17'-0" × 13'-0"

GREAT ROOM

289 sq ft

17'-0" × 17'-0"

BEDROOM 2

193 sq ft

11'-0" × 17'-6"

HALL BATH

138 sq ft

11'-0" × 12'-6"

Build Cost Estimator

Estimated Cost to Build (40' × 30' Modular / Prefab Cottage)

Region:

Shell / Building Kit

$50,000 – $64,000

Framing package, roof trusses & exterior shell for 1,200 sq ft base.

Owner-Builder

$123,500 – $162,500

Saves ~$55,500 by managing local slab & interior trades.

Turnkey Builder

$179,000 – $218,000

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

Est. Monthly Payment

$1,030 / mo

$158,800 financed (30-Yr)

Down Payment:20%

Interest Rate:6.75%

Free Vector CAD Blueprint • Plan HG-1864

Download 40' × 30' Modular / Prefab Cottage 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 (23 yd³), roof surface (~1,456 sq ft), wall framing & architectural notes

Building Package	Specification	Quantity	Est. Range
Structural Shell & Trusses	40'×30' Factory-Engineered 2x6 Modular Box System w/ Marriage Wall	1,200 sq ft shell kit	$50,000 – $64,000
Concrete Slab & Grade Beams	Stem Wall Crawlspace or Full Perimeter Foundation	23 Cubic Yards (4,000 PSI)	$11,250 – $14,500
Roofing & Underlayment	Hinged 5:12 Architectural Shingle or Metal Gable Roof (5:12 Pitch)	16 Roofing Squares (1,600 sq ft)	$6,720 – $10,880
Closed-Cell Spray Foam / Insulation	3" Closed-Cell Wall & Roof Deck Thermal Envelope (R-21 to R-38)	8,130 Board Feet	$10,976 – $15,041
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	2.5 Ton (30,000 BTU/hr)	$6,500 – $10,250

Exterior Perimeter

140 Linear Ft

Interior Partitions

~122 Linear Ft

Est. Concrete Slab

23 Cubic Yards

Roof Deck Area

~1,456 Sq Ft

Plan HG-1864 (1,201 Sq Ft (30x40) 3 Bed 2 Bath Modular / Prefab Cottage Floor Plan (Split-Bedroom Privacy Wing + Center Great Room)) is an IRC R304/R310-vetted modular / prefab cottage blueprint engineered around a 40'-0" × 30'-0" structural grid (1,200 sq ft base footprint, 0.75:1 Square-Bay Proportion). Configured on the Split-Bedroom Privacy Wing + Center Great Room topology, this layout delivers 1,201 sq ft of conditioned residential living area and 119 sq ft of covered outdoor porch deck.

Inside the conditioned envelope, the floor plan is organized into 6 distinct architectural zones: PRIMARY SUITE (12'-0" × 18'-0", 216 sq ft), EN-SUITE BATH (12'-0" × 12'-0", 144 sq ft), KITCHEN & ISLAND (17'-0" × 13'-0", 221 sq ft), GREAT ROOM (17'-0" × 17'-0", 289 sq ft), BEDROOM 2 (11'-0" × 17'-6", 193 sq ft), HALL BATH (11'-0" × 12'-6", 138 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 216 sq ft; BEDROOM 2 at 193 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 40' clear-span width utilizes factory-engineered 2x6 modular box system w/ marriage wall bearing on 140 linear feet of 6" exterior wall framing (~155 framing studs/posts) and 122 linear feet of interior partitions. The 5:12 hinged 5:12 architectural shingle or metal gable roof requires approximately 1,456 sq ft of roofing material (16 roofing squares), while the stem wall crawlspace or full perimeter foundation pours at an estimated 23 cubic yards of 4,000-PSI concrete.

Frequently Asked Questions • Plan HG-1864

Building costs, foundation specs, egress & CAD customization questions

How much does it cost to build the 40x30 1,201 Sq Ft (30x40) 3 Bed 2 Bath Modular / Prefab Cottage Floor Plan (Split-Bedroom Privacy Wing + Center Great Room) (HG-1864)?

Based on current national residential construction data for modular / prefab cottage structures, the dried-in structural shell for Plan HG-1864 (1,200 sq ft base footprint) ranges from $50,000 to $64,000 ($44/sq ft baseline). A complete turnkey build—including the 23-yard concrete foundation, 122 linear feet of interior framing, MEP rough-ins for 2 bath(s), and interior finishes across 1,201 sq ft of heated space—ranges from $179,000 to $218,000. 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 1,201 sq ft 3-bedroom layout?

Plan HG-1864 features 6 architecturally solved spaces inside its 40' × 30' footprint: PRIMARY SUITE (12'-0" × 18'-0", 216 sq ft), EN-SUITE BATH (12'-0" × 12'-0", 144 sq ft), KITCHEN & ISLAND (17'-0" × 13'-0", 221 sq ft), GREAT ROOM (17'-0" × 17'-0", 289 sq ft), BEDROOM 2 (11'-0" × 17'-6", 193 sq ft), HALL BATH (11'-0" × 12'-6", 138 sq ft). Every habitable room meets or exceeds IRC R304 minimum area (70+ sq ft) and minimum horizontal dimension (7'-0"+) requirements.

Can this 40' × 30' floor plan be built with post-frame, red-iron steel, or 2x6 stick framing?

Yes. Because the outer envelope is engineered on an even 40'-0" × 30'-0" structural grid (140 LF perimeter) with clear-span 5:12 trusses, a local structural engineer or building kit supplier can adapt the blueprint for Factory-Engineered 2x6 Modular Box System w/ Marriage Wall, 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-1864?

Downloading Plan HG-1864 provides the high-resolution scalable vector floor plan (.SVG) with crisp architectural lineweights, exterior dimension strings (40'-0" × 30'-0"), room-by-room callouts, door swing arcs, and window schedules, plus instant browser printing for contractor bidding and preliminary municipal zoning review.