Plan HG-2728•Garage with Loft / Apartment Above•30' × 18' Footprint

18' × 30' Garage + Apt

Private Stair Entry + Balcony Loft • 703 sq ft heated + 378 sq ft 1-bay shop • 1 Bed, 1 Bath

Room Dimensions & Zones

30' × 18' Shell

1-BAY GARAGE

378 sq ft

21'-0" × 18'-0"

UTILITY & GEAR

72 sq ft

9'-0" × 8'-0"

FOYER & STAIRS

90 sq ft

9'-0" × 10'-0"

PRIMARY SUITE

132 sq ft

15'-6" × 8'-6"

WALK-IN CLOSET

51 sq ft

6'-0" × 8'-6"

FULL BATH

72 sq ft

8'-6" × 8'-6"

LIVING & DINING

114 sq ft

12'-0" × 9'-6"

KITCHEN & ISLAND

86 sq ft

9'-0" × 9'-6"

STAIR LANDING

86 sq ft

9'-0" × 9'-6"

Build Cost Estimator

Estimated Cost to Build (30' × 18' Garage with Loft / Apartment Above)

Region:

Shell / Building Kit

$35,000 – $45,000

Framing package, roof trusses & exterior shell for 540 sq ft base.

Owner-Builder

$78,500 – $103,500

Saves ~$35,500 by managing local slab & interior trades.

Turnkey Builder

$114,000 – $139,000

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

Est. Monthly Payment

$656 / mo

$101,200 financed (30-Yr)

Down Payment:20%

Interest Rate:6.75%

Free Vector CAD Blueprint • Plan HG-2728

Download 30' × 18' Garage with Loft / Apartment Above 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 (15 yd³), roof surface (~727 sq ft), wall framing & architectural notes

Building Package	Specification	Quantity	Est. Range
Structural Shell & Trusses	30'×18' 2x6 Lower Walls + 14" Engineered Wood I-Joist Floor System	540 sq ft shell kit	$35,000 – $45,000
Concrete Slab & Grade Beams	6" Reinforced Garage Slab w/ Perimeter Footings & Apron	15 Cubic Yards (4,000 PSI)	$6,250 – $7,750
Roofing & Underlayment	Dormered Gable or Gambrel Roof (8:12 / 4:12 Shed Dormers) (8:12 Pitch)	8 Roofing Squares (800 sq ft)	$3,360 – $5,440
Closed-Cell Spray Foam / Insulation	3" Closed-Cell Wall & Roof Deck Thermal Envelope (R-21 to R-38)	7,335 Board Feet	$9,902 – $13,570
Windows & Exterior Doors	Low-E Argon Black Architectural Glazing + Insulated Overhead Shop Door(s)	8 Windows • 8 Doors	$8,400 – $13,240
HVAC & Multi-Zone Mini-Split	High-SEER2 Heat Pump / Ductless Mini-Split System	1.5 Ton (18,000 BTU/hr)	$3,900 – $6,150

Exterior Perimeter

96 Linear Ft

Interior Partitions

~136 Linear Ft

Est. Concrete Slab

15 Cubic Yards

Roof Deck Area

~727 Sq Ft

Plan HG-2728 (541 Sq Ft (18×30) 1 Bed, 1 Bath Garage + Apt Floor Plan) is an IRC R304/R310-vetted garage with loft / apartment above blueprint engineered around a 30'-0" × 18'-0" structural grid (540 sq ft base footprint, 0.6:1 Square-Bay Proportion). Configured on the Private Stair Entry + Balcony Loft topology, this layout delivers 703 sq ft of conditioned residential living area paired with a 378 sq ft fire-separated workshop/garage bay and 72 sq ft of covered outdoor porch deck.

Inside the conditioned envelope, the floor plan is organized into 9 distinct architectural zones: 1-BAY GARAGE (21'-0" × 18'-0", 378 sq ft), UTILITY & GEAR (9'-0" × 8'-0", 72 sq ft), FOYER & STAIRS (9'-0" × 10'-0", 90 sq ft), PRIMARY SUITE (15'-6" × 8'-6", 132 sq ft), WALK-IN CLOSET (6'-0" × 8'-6", 51 sq ft), FULL BATH (8'-6" × 8'-6", 72 sq ft). Plumbing rough-ins are consolidated across UTILITY & GEAR, FULL BATH, KITCHEN & ISLAND to minimize sub-slab trenching and manifold pipe runs. Sleeping quarters (PRIMARY SUITE at 132 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 30' clear-span width utilizes 2x6 lower walls + 14" engineered wood i-joist floor system bearing on 96 linear feet of 6" exterior wall framing (~146 framing studs/posts) and 136 linear feet of interior partitions. The 8:12 dormered gable or gambrel roof (8:12 / 4:12 shed dormers) requires approximately 727 sq ft of roofing material (8 roofing squares), while the 6" reinforced garage slab w/ perimeter footings & apron pours at an estimated 15 cubic yards of 4,000-PSI concrete.

Frequently Asked Questions • Plan HG-2728

Building costs, foundation specs, egress & CAD customization questions

How much does it cost to build the 30x18 541 Sq Ft (18×30) 1 Bed, 1 Bath Garage + Apt Floor Plan (HG-2728)?

Based on current national residential construction data for garage with loft / apartment above structures, the dried-in structural shell for Plan HG-2728 (540 sq ft base footprint) ranges from $35,000 to $45,000 ($38/sq ft baseline). A complete turnkey build—including the 15-yard concrete foundation, 136 linear feet of interior framing, MEP rough-ins for 1 bath(s), and interior finishes across 703 sq ft of heated space plus the 378 sq ft shop bay—ranges from $114,000 to $139,000. 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 703 sq ft 1-bedroom layout?

Plan HG-2728 features 9 architecturally solved spaces inside its 30' × 18' footprint: 1-BAY GARAGE (21'-0" × 18'-0", 378 sq ft), UTILITY & GEAR (9'-0" × 8'-0", 72 sq ft), FOYER & STAIRS (9'-0" × 10'-0", 90 sq ft), PRIMARY SUITE (15'-6" × 8'-6", 132 sq ft), WALK-IN CLOSET (6'-0" × 8'-6", 51 sq ft), FULL BATH (8'-6" × 8'-6", 72 sq ft), LIVING & DINING (12'-0" × 9'-6", 114 sq ft), KITCHEN & ISLAND (9'-0" × 9'-6", 86 sq ft), STAIR LANDING (9'-0" × 9'-6", 86 sq ft). Every habitable room meets or exceeds IRC R304 minimum area (70+ sq ft) and minimum horizontal dimension (7'-0"+) requirements.

Can this 30' × 18' floor plan be built with post-frame, red-iron steel, or 2x6 stick framing?

Yes. Because the outer envelope is engineered on an even 30'-0" × 18'-0" structural grid (96 LF perimeter) with clear-span 8:12 trusses, a local structural engineer or building kit supplier can adapt the blueprint for 2x6 Lower Walls + 14" Engineered Wood I-Joist Floor System, 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-2728?

Downloading Plan HG-2728 provides the high-resolution scalable vector floor plan (.SVG) with crisp architectural lineweights, exterior dimension strings (30'-0" × 18'-0"), room-by-room callouts, door swing arcs, and window schedules, plus instant browser printing for contractor bidding and preliminary municipal zoning review.

3D Exterior Concept

18' × 30' Garage + Apt

Est. $35,000 Kit