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Modern Flat Roof Shed 8x12 - Front Elevation - Modern Flat Roof Shed showing door and flat roof roof profileblueprint

Front Elevation - Modern Flat Roof Shed showing door and flat roof roof profile

Modern Flat Roof Shed

Medium Shedintermediate
$39.95
Size
8′ W × 12′ D
Peak Height
9
Roof Style
Flat Roof
Build Time
2 weekends
Est. Material Cost
$1,450 - $1,950
Square Footage
96 sq ft
Roof Pitch
1/12
Wall Height
8.5'-0"
Door
36" x 84" Single Glass
Foundation
Concrete Slab
Windows
3
Snow Load
40 psf (standard residential)
Wind Rating
110 mph (Exposure B)

Sleek contemporary shed with flat roof and transom windows for modern homes.

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Plan Drawings & Blueprints

Professional architectural drawings included with this plan

Modern Flat Roof Shed 8x12 - Front Elevation - Modern Flat Roof Shed showing door and flat roof roof profileblueprint

Front Elevation - Modern Flat Roof Shed showing door and flat roof roof profile

Modern Flat Roof Shed 8x12 - Side Elevation - showing windows and roof lineblueprint

Side Elevation - showing windows and roof line

Modern Flat Roof Shed 8x12 - Floor Plan - 8' x 12' layoutblueprint

Floor Plan - 8' x 12' layout

Modern Flat Roof Shed 8x12 - Landscape View - Modern Flat Roof Shed in backyard settingrender

Landscape View - Modern Flat Roof Shed in backyard setting

Description

Clean contemporary lines meet practical storage in this modern flat-roof design. The minimal roof slope (just enough for drainage) creates a sleek silhouette that complements modern architecture. Floor-to-ceiling height throughout provides maximum usable volume. Three transom windows across the front flood the interior with light while maintaining privacy. Perfect as a backyard office, studio, or premium storage solution.

Building Overview

About the Modern Flat Roof Shed

Clean contemporary lines meet practical storage in this modern flat-roof design. The minimal roof slope (just enough for drainage) creates a sleek silhouette that complements modern architecture. Floor-to-ceiling height throughout provides maximum usable volume. Three transom windows across the front flood the interior with light while maintaining privacy. Perfect as a backyard office, studio, or premium storage solution.

Flat Roof Design Highlights

The flat roof design of this 8x12 shed provides 96 square feet of usable space with a 8.5-foot wall height. The 1/12 roof pitch balances aesthetics with practical weather protection. Fiber Cement Panel (smooth) siding gives the exterior a distinctive character that complements a wide range of home styles.

Foundation & Floor

The Concrete Slab provides a solid, level base for the structure. Concrete Slab with Vapor Barrier creates a sturdy floor capable of supporting stored items and foot traffic. This foundation approach is well-suited for the 8' x 12' footprint and local building code requirements in most jurisdictions.

Roof Construction

EPDM Rubber Membrane roofing over the 1/12 pitch flat roof roof provides reliable weather protection. The 2x8 rafters are spaced to handle standard snow and wind loads. Proper underlayment and drip edge detailing ensure a long-lasting, leak-free roof assembly.

Ideal Uses

At 96 square feet, this shed accommodates lawn equipment, a workbench, and organized storage. The 36-inch wide door opening allows easy movement of larger items like riding mowers or wheelbarrows.

Features

  • Contemporary flat roof with hidden drainage
  • Three transom windows for daylight
  • 8.5ft ceiling height throughout
  • Minimalist design suits modern architecture
  • EPDM rubber membrane roofing for durability

Complete Material List

Every board, nail, and shingle — nothing left to guess

4Foundation

ItemQty
Ready-Mix Concrete2 cubic yards
Wire Mesh Reinforcement2 rolls
6-mil Poly Vapor Barrier1 rolls
2x4 Form Lumber5

3Framing Lumber

ItemQty
2x4 SPF/KD50
2x4 SPF/KD15
2x8 SPF (or LVL)8

5Roofing

ItemQty
2x8 SPF/KD8
EPDM Rubber Membrane106 sq ft
1/2" OSB Sheathing4 sheets
EPDM Adhesive2 gallons
EPDM Edge Trim4

3Siding & Trim

ItemQty
Fiber Cement Panel (smooth)10 sheets
1x4 Trim Board11
1x6 Fascia Board5

2Doors & Windows

ItemQty
Glass Panel Door1
Fixed/Awning Window3

8Hardware & Fasteners

ItemQty
16d Galvanized Nails7 lbs
8d Galvanized Nails4 lbs
1-1/4" Roofing Nails2 lbs
3" Deck Screws3 lbs
Simpson Strong-Tie Angles12
T-Hinges3
Door Latch/Lock1
Exterior Paint/Stain2 gallons

Cut List

Pre-calculated cuts — take this list straight to the lumber yard

Wall Studs - Front

Material: 2x4 SPF/KD

LengthQty
102" (8.5')3
84" (7')2
10" (0.9')2

Wall Studs - Back

Material: 2x4 SPF/KD

LengthQty
102" (8.5')7

Wall Studs - Sides

Material: 2x4 SPF/KD

LengthQty
102" (8.5')20

Top & Bottom Plates

Material: 2x4 SPF/KD

LengthQty
96" (8')6
144" (12')6

Door Header

Material: 2x8 SPF (doubled)

LengthQty
39" (3.2')2

Rafters

Material: 2x8 SPF/KD

LengthQty
96" (8.0')8

What's Included

  • Detailed material list
  • Step-by-step instructions with illustrations
  • Complete lumber cut list
  • Foundation guide
  • Hardware & fastener specifications
  • Tool list
  • Blueprint drawings (front, side, floor plan)
  • Landscape visualization
$39.95

Specifications

Floor Area
96 sq ft
Roof Pitch
1/12
Wall Height
8.5'-0"
Door
36" x 84" Single Glass
Windows
3
Foundation
Concrete Slab
Roofing
EPDM Rubber Membrane
Siding
Fiber Cement Panel (smooth)
Floor
Concrete Slab with Vapor Barrier
Snow Load
40 psf (standard residential)
Wind Rating
110 mph (Exposure B)

Estimated Material Cost

$3,203$4,522

Based on 8′×12′ footprint · Midwest avg. pricing

Framing Lumber
$861
Roofing
$443
Siding
$839
Foundation
$684
Hardware
$285
Doors & Windows
$386
Paint / Stain
$270
Mid-range Total
$3,768
Customize Estimate

Estimate uses mid-2026 US avg. prices. Adjust region, roofing, siding, and foundation in the full calculator.

Ready to build?

Download includes all blueprints, material list, cut list, and step-by-step instructions.

$39.95

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