Garden Shed Size Calculator — How Big a Shed Do You Need

Select your equipment and get the right shed size with cost estimates

Recommended Shed

8×12

Floor Area

96 sq ft

Est. Cost

$1,800

Equipment

30 sq ft

✓

Lawn Mower12 sq ft

Riding Mower24 sq ft

✓

Wheelbarrow6 sq ft

✓

Hand Tools Rack4 sq ft

✓

Potting Bench8 sq ft

Bicycle (each)6 sq ft

Seasonal Storage10 sq ft

Bags/Fertilizer6 sq ft

Garden Hose/Reel3 sq ft

Snow Blower10 sq ft

Extension Ladder4 sq ft

Power Tool Bench8 sq ft

Extra Workspace (%)

0%20%50%

Aisle Width (ft)

Recommended Shed

8×12

96 sq ft

Equipment Area

30 sq ft

Total Needed

84 sq ft

Estimated Cost$1,800

Pre-built kit, mid-range quality

Space Utilization

Equipment30 sq ft

Workspace6 sq ft

Aisles48 sq ft

31.3% floor utilization

Area Breakdown

Equipment Footprint30 sq ft

+ Workspace (20%)6 sq ft

+ Aisle (2 ft wide)48 sq ft

Total Needed84 sq ft

Shed Provides96 sq ft

Permit Note

Most areas require a building permit for sheds over 120 sq ft. Check local setback rules—typically 3–5 ft from property lines.

Example Calculations

1Basic Garden Shed (Mower + Tools)

Inputs

EquipmentLawn mower, hand tools, potting bench, wheelbarrow

Workspace20%

Aisle Width2 ft

Result

Recommended Shed8×10 (80 sq ft)

Equipment Area30 sq ft

Total Needed58 sq ft

Est. Cost$1,200

Equipment: 12 + 4 + 8 + 6 = 30 sq ft. Workspace: 30 × 1.2 = 36 sq ft. Aisle: perimeter × 2 ft ≈ 22 sq ft. Total = 58 sq ft. Nearest standard: 8×10 (80 sq ft) at $1,200.

2Workshop Shed (Full Equipment)

Inputs

EquipmentRiding mower, wheelbarrow, tools, bench, 2 bikes, seasonal, snow blower

Workspace30%

Aisle Width3 ft

Result

Recommended Shed10×16 (160 sq ft)

Equipment Area68 sq ft

Total Needed127 sq ft

Est. Cost$3,500

Equipment: 24 + 6 + 4 + 8 + 12 + 10 + 4 = 68 sq ft. Workspace: 68 × 1.3 = 88 sq ft. Aisle: ~39 sq ft. Total = 127 sq ft. Nearest standard: 10×16 (160 sq ft) at $3,500.

3Compact Tool Shed (Minimal)

Inputs

EquipmentHand tools rack, garden hose, bags/fertilizer

Workspace10%

Aisle Width1.5 ft

Result

Recommended Shed6×8 (48 sq ft)

Equipment Area13 sq ft

Total Needed23 sq ft

Est. Cost$800

Equipment: 4 + 3 + 6 = 13 sq ft. Workspace: 13 × 1.1 = 14 sq ft. Aisle: ~9 sq ft. Total = 23 sq ft. Nearest standard: 6×8 (48 sq ft) at $800. Plenty of room to grow.

Show all examples

Frequently Asked Questions

What size shed do I need for a lawn mower and basic tools?

A standard push lawn mower (12 sq ft), wheelbarrow (6 sq ft), hand tools rack (4 sq ft), and a potting bench (8 sq ft) require a minimum of 30 sq ft of equipment space. With 20% workspace and a 2-foot aisle, you need about 48–60 sq ft. A 6×8 shed (48 sq ft) is the minimum; an 8×10 (80 sq ft) provides comfortable room.

Push mower + hand tools: 6×8 shed (48 sq ft) minimum
Add wheelbarrow + potting bench: 8×10 shed (80 sq ft) recommended
Add bicycles or seasonal storage: 8×12 shed (96 sq ft)
Riding mower requires 24 sq ft of floor space alone
Always size up one step from minimum for future storage growth

Equipment Set	Floor Needed	Recommended Shed	Est. Cost
Mower + Tools	30 sq ft	6×8 (48 sq ft)	$800
+ Wheelbarrow + Bench	48 sq ft	8×10 (80 sq ft)	$1,200
+ Bikes + Seasonal	70 sq ft	8×12 (96 sq ft)	$1,800
+ Riding Mower	100 sq ft	10×12 (120 sq ft)	$2,500

Do I need a building permit for a garden shed?

In most US jurisdictions, sheds under 120 sq ft do not require a building permit, but you must still follow setback rules (distance from property lines and other structures). Sheds over 120–200 sq ft typically require a permit. Always check your local building codes before construction.

Under 120 sq ft: usually no permit required (most US jurisdictions)
120–200 sq ft: permit requirements vary by municipality
Over 200 sq ft: almost always requires a building permit
Typical setback: 3–5 ft from side/rear property lines
HOA neighborhoods may have additional restrictions on shed size and style

How much does a garden shed cost?

Pre-built shed kits range from $800 for a 6×8 to $5,000+ for a 12×16. Custom-built sheds cost 2–3x more. The biggest cost factors are size, material (wood vs vinyl vs metal), and whether you build it yourself or hire a contractor.

6×8 (48 sq ft): $800–$1,200 for a kit, best for basic tool storage
8×10 (80 sq ft): $1,200–$1,800, good all-around garden shed
10×12 (120 sq ft): $2,500–$3,500, workshop space included
12×16 (192 sq ft): $5,000–$7,000, full workshop and vehicle storage
Add $500–$1,500 for a concrete or gravel foundation pad

Size	Kit Cost	Custom Build	Best For
6×8	$800–$1,200	$1,500–$2,500	Basic tools
8×10	$1,200–$1,800	$2,500–$4,000	Garden shed
10×12	$2,500–$3,500	$4,000–$6,000	Workshop
12×16	$5,000–$7,000	$7,000–$12,000	Full workshop

How do I organize a small garden shed efficiently?

Use vertical space with pegboards, wall-mounted racks, and overhead shelf systems. A pegboard wall stores 40+ hand tools in just 4 sq ft. Magnetic strips hold small metal tools. Clear bins on shelves keep seasonal items visible. Keep the floor clear for large equipment like mowers and wheelbarrows.

Pegboard wall: stores 40+ hand tools in 4 sq ft of wall space
Overhead loft or shelf: adds 20–30% storage for seasonal items
Magnetic strips: hold small metal tools, pruners, and scissors
Wall-mounted hooks: hang ladders, hoses, and long-handled tools vertically
Clear labeled bins: keep fertilizer, seeds, and supplies organized on shelves

Show all questions

Example Calculations

1Basic Garden Shed (Mower + Tools)

Inputs

EquipmentLawn mower, hand tools, potting bench, wheelbarrow

Workspace20%

Aisle Width2 ft

Result

Recommended Shed8×10 (80 sq ft)

Equipment Area30 sq ft

Total Needed58 sq ft

Est. Cost$1,200

Equipment: 12 + 4 + 8 + 6 = 30 sq ft. Workspace: 30 × 1.2 = 36 sq ft. Aisle: perimeter × 2 ft ≈ 22 sq ft. Total = 58 sq ft. Nearest standard: 8×10 (80 sq ft) at $1,200.

2Workshop Shed (Full Equipment)

Inputs

EquipmentRiding mower, wheelbarrow, tools, bench, 2 bikes, seasonal, snow blower

Workspace30%

Aisle Width3 ft

Result

Recommended Shed10×16 (160 sq ft)

Equipment Area68 sq ft

Total Needed127 sq ft

Est. Cost$3,500

Equipment: 24 + 6 + 4 + 8 + 12 + 10 + 4 = 68 sq ft. Workspace: 68 × 1.3 = 88 sq ft. Aisle: ~39 sq ft. Total = 127 sq ft. Nearest standard: 10×16 (160 sq ft) at $3,500.

3Compact Tool Shed (Minimal)

Inputs

EquipmentHand tools rack, garden hose, bags/fertilizer

Workspace10%

Aisle Width1.5 ft

Result

Recommended Shed6×8 (48 sq ft)

Equipment Area13 sq ft

Total Needed23 sq ft

Est. Cost$800

Equipment: 4 + 3 + 6 = 13 sq ft. Workspace: 13 × 1.1 = 14 sq ft. Aisle: ~9 sq ft. Total = 23 sq ft. Nearest standard: 6×8 (48 sq ft) at $800. Plenty of room to grow.

Show all examples

Frequently Asked Questions

What size shed do I need for a lawn mower and basic tools?

Push mower + hand tools: 6×8 shed (48 sq ft) minimum
Add wheelbarrow + potting bench: 8×10 shed (80 sq ft) recommended
Add bicycles or seasonal storage: 8×12 shed (96 sq ft)
Riding mower requires 24 sq ft of floor space alone
Always size up one step from minimum for future storage growth

Equipment Set	Floor Needed	Recommended Shed	Est. Cost
Mower + Tools	30 sq ft	6×8 (48 sq ft)	$800
+ Wheelbarrow + Bench	48 sq ft	8×10 (80 sq ft)	$1,200
+ Bikes + Seasonal	70 sq ft	8×12 (96 sq ft)	$1,800
+ Riding Mower	100 sq ft	10×12 (120 sq ft)	$2,500

Do I need a building permit for a garden shed?

Under 120 sq ft: usually no permit required (most US jurisdictions)
120–200 sq ft: permit requirements vary by municipality
Over 200 sq ft: almost always requires a building permit
Typical setback: 3–5 ft from side/rear property lines
HOA neighborhoods may have additional restrictions on shed size and style

How much does a garden shed cost?

6×8 (48 sq ft): $800–$1,200 for a kit, best for basic tool storage
8×10 (80 sq ft): $1,200–$1,800, good all-around garden shed
10×12 (120 sq ft): $2,500–$3,500, workshop space included
12×16 (192 sq ft): $5,000–$7,000, full workshop and vehicle storage
Add $500–$1,500 for a concrete or gravel foundation pad

Size	Kit Cost	Custom Build	Best For
6×8	$800–$1,200	$1,500–$2,500	Basic tools
8×10	$1,200–$1,800	$2,500–$4,000	Garden shed
10×12	$2,500–$3,500	$4,000–$6,000	Workshop
12×16	$5,000–$7,000	$7,000–$12,000	Full workshop

How do I organize a small garden shed efficiently?

Pegboard wall: stores 40+ hand tools in 4 sq ft of wall space
Overhead loft or shelf: adds 20–30% storage for seasonal items
Magnetic strips: hold small metal tools, pruners, and scissors
Wall-mounted hooks: hang ladders, hoses, and long-handled tools vertically
Clear labeled bins: keep fertilizer, seeds, and supplies organized on shelves

Show all questions

Garden Shed Size Calculator — How Big a Shed Do You Need

Equipment Inventory

Extra Space

Space Utilization

Area Breakdown

Example Calculations

1Basic Garden Shed (Mower + Tools)

2Workshop Shed (Full Equipment)

3Compact Tool Shed (Minimal)

Frequently Asked Questions

What size shed do I need for a lawn mower and basic tools?

Do I need a building permit for a garden shed?

How much does a garden shed cost?

How do I organize a small garden shed efficiently?

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Garden Shed Size Calculator — How Big a Shed Do You Need

Equipment Inventory

Extra Space

Space Utilization

Area Breakdown

Example Calculations

1Basic Garden Shed (Mower + Tools)

2Workshop Shed (Full Equipment)

3Compact Tool Shed (Minimal)

Frequently Asked Questions

What size shed do I need for a lawn mower and basic tools?

Do I need a building permit for a garden shed?

How much does a garden shed cost?

How do I organize a small garden shed efficiently?

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Raised Bed Calculator

Greenhouse Calculator

Garden Path Calculator

Compost Calculator

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Storage Unit Calculator — Right Size Guide

Related Resources

Garden Watering Calculator: How Much Water Does Your Garden Really Need?

Vegetable Garden Spacing Chart: Plant Spacing Calculator and Yield Guide

How to Build a Raised Bed Garden: Complete Soil & Materials Calculator Guide

Raised Bed Calculator

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