You want to build a garden shed. Smart move. But you search online and find three different methods, no material list, and videos that cut off halfway through.
Not helpful.
In this guide, I’ll walk you through exactly how to build a shed — step by step. What you need. What most people get wrong. And how to do it right the first time.
What You Need Before You Start
Most people start by buying materials. Wrong.
Start with a plan. A good building plan is half the work. It tells you exactly what wood you need, in what dimensions, and in what order to build.
Without a plan, you buy too much, cut wrong, and rebuild the same piece three times.
What you need for a standard garden shed (e.g. 6×10 ft / 2×3 m):
- Concrete piers or strip foundation
- Structural timber for the frame (e.g. 2×4 or 2×6)
- Cladding boards or siding for the exterior walls
- Roof sheeting (OSB or plywood), roofing material (EPDM or shingles)
- Doors and optionally windows
- Fasteners: screws, anchors, joist hangers
The exact quantities depend on your dimensions. A material list with each plan prevents two trips to the hardware store.
Step 1: Determine Size and Check Planning Permission
Before you cut a single plank, sort out the paperwork.
In most countries, small outbuildings up to a certain size can be built without planning permission — but the rules vary significantly by location. In the UK, permitted development rights typically allow sheds up to 2.5m high without permission. In the US, regulations vary by state and municipality. In Australia, rules differ by state.
Always check with your local council or planning authority. Never assume.
Then determine your dimensions:
- How big does the shed need to be? Think bigger than you think — you’ll fill it anyway.
- Which way should the door face? Avoid facing into prevailing wind and rain.
- How high does it need to be? For tools: 7ft (2.2m) clear height is fine. For bikes or a workbench: 8ft (2.4m).
Step 2: Lay the Foundation
A shed without a solid foundation will shift and settle. It’s a matter of years, but you don’t want it.
There are two common options:
Option 1: Concrete piers (easiest)
Dig holes at least 24 inches (60 cm) deep, pour concrete, and set a post base or anchor in the wet concrete. Make sure all piers are at the same height. Use a spirit level and a taut string line to check this.
Option 2: Concrete strip
A continuous concrete strip around the full footprint, 8-10 inches wide and 12-16 inches deep (below the frost line). More stable but more work.
For a shed up to 10×13 ft (3x4m), piers are fine. Larger? Use a strip.
Let the foundation cure for at least one week before building on it.
Step 3: Build the Floor Frame
On the foundation, you build the sill plate: a rectangular wooden frame that the shed sits on.
Use pressure-treated lumber for anything that contacts or is close to the ground. Untreated wood will rot within five years.
Build order:
- Lay the long rim joists on the piers
- Add the cross joists at 16-24 inches on center
- Check the frame is square: measure the diagonals — if they’re equal, you’re square
- Secure the frame to the piers with anchors
Then lay the floor sheathing (OSB or plywood, minimum ¾ inch / 18mm thick) on the frame.
Step 4: Frame the Walls
This is where most beginners go wrong: they frame the walls in place. That’s heavy and awkward.
Frame your walls flat on the ground. Square, plumb, with all openings for doors and windows in the right place. Then tilt them up and secure them.
Per wall:
- Bottom plate and top plate (2×4 or 2×6 lumber)
- Studs at 16 inches on center
- Door and window openings framed with headers and jack studs
- Check square and plumb
Connect the four walls at the corners and secure them to the floor frame.
Step 5: Build the Roof
For a simple garden shed, you have two main options:
Flat or low-slope roof:
Easiest to build. Use a minimum slope of 1:50 (1 inch per 4 feet) so water drains off. Cover with EPDM rubber — it lasts 30-50 years if properly installed.
Gable roof (peaked roof):
More attractive, better for snow loads, more interior headroom. Slightly more complex because you need to build roof trusses. Cover with asphalt shingles or metal roofing.
For a first shed, EPDM on a low-slope roof is the easiest choice.
Build order for the roof:
- Lay the rafters or trusses (resting on the top plates of the walls)
- Add the roof sheathing (OSB, minimum ½ inch for normal spans)
- Apply EPDM membrane and secure at the edges with adhesive or termination bars
Step 6: Clad the Walls
Now you attach the exterior cladding to the frame.
Popular options:
- Lap siding — overlapping horizontal boards. Classic, excellent rain protection.
- Board and batten — vertical boards with narrow strips over the joints. More modern look.
- T1-11 or OSB siding — cheapest option, requires paint or stain to protect it.
Always work from the bottom up so boards overlap and water runs off.
Paint or stain all boards before mounting, including the cut ends. This fully protects the wood.
Step 7: Hang the Doors and Finish
Last step. The best one too, because now it starts to look like a shed.
Hang the doors and windows:
- Use heavy-duty hinges — minimum 3 per door for a heavy door
- Allow clearance around the door (⅛ inch / 3-4mm all around)
- Install a latch or lock
Finishing touches:
- Caulk all joints around frames and connections
- Paint or stain the complete exterior
- Check all connections are properly fastened
Building It Yourself vs. Hiring a Contractor: What Does It Really Cost?
Here’s the comparison nobody gives you straight.
Hiring a contractor (6×10 ft / 2x3m shed):
| Item | Cost |
|---|---|
| Materials | $900 – $1,400 |
| Labor (60-100 hours at $50-80/hr) | $3,000 – $8,000 |
| Overhead and markup | $500 – $1,000 |
| **Total** | **$4,400 – $10,400** |
Building it yourself:
| Item | Cost |
|---|---|
| Materials | $900 – $1,400 |
| Tool rental (if needed) | $100 – $200 |
| Building plans | $67 – $97 |
| **Total** | **$1,067 – $1,697** |
Your savings: $3,300 – $8,700
And your “hourly rate”? If you spend 20 hours building and save $5,000, you’ve effectively paid yourself $250 per hour. Tax free. In your own backyard.
The 5 Most Common Shed Building Mistakes
1. Building without a plan
You don’t know how much material you need, you cut by guesswork, and you get stuck. A complete building plan with material list and cut list prevents this entirely.
2. Using the wrong wood near the ground
Untreated lumber in contact with soil will rot. Always use pressure-treated wood rated for ground contact (UC4/0.40 CCA equivalent).
3. Building walls out of square
Check every wall for square using a level AND by measuring the diagonals. A wall that’s ½ inch out of plumb causes problems with the door.
4. Forgetting floor ventilation
A sealed floor traps moisture. Leave at least 2-4 vent gaps at the bottom of the side walls.
5. Not enough slope on the roof
A flat roof with no slope traps water. Minimum 1:50, preferably 1:20.
How Much Does a Shed Cost to Build?
Rough estimates for self-build (materials only):
| Size | Estimated material cost |
|---|---|
| 6 x 8 ft (2×2.5m) | $500 – $800 |
| 8 x 10 ft (2.5x3m) | $700 – $1,100 |
| 10 x 12 ft (3×3.5m) | $900 – $1,400 |
| 12 x 16 ft (3.5x5m) | $1,400 – $2,200 |
Depending on finish, roof type, and wood species. EPDM roofing is cheaper than shingles. Lap siding is more expensive than OSB siding.
Frequently Asked Questions
Do I need planning permission for a garden shed?
In most cases, small sheds under a certain size and height don’t require permission — but rules vary by country, region, and municipality. Always check with your local authority before building.
What wood should I use for the frame?
Structural lumber graded #2 or better (SPF, Douglas fir). For anything near or in the ground: pressure-treated lumber rated UC4 or ground contact.
How long does it take to build a shed?
Two people can build a 10×12 ft shed in a good weekend. With proper preparation (plans, pre-cut materials), it goes faster than you think.
How long will a DIY shed last?
With correct use of pressure-treated wood, proper roofing, and a coat of paint every 5 years: easily 25-40 years.
Conclusion: Start With a Good Plan
Building a shed is doable. Really.
Most problems don’t come from it being too hard — they come from people starting without a plan. Buying the wrong wood. Cutting the wrong dimensions. Getting stuck halfway through.
With a complete building plan — including material list and cut list — you know exactly what to buy, how to cut it, and in what order to build. That saves mistakes, money, and frustration.
Do yourself a favor. Start with a good plan.
Ready to get started? fredsdiyplans.com includes dozens of complete shed plans in all sizes — each with full instructions, material list, and cut list. One-time purchase. Lifetime access.
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- Word count: ~2,100
- Format: how-to (7 steps) + cost comparison + FAQ
- Primary keyword: how to build a garden shed
- Secondary keywords: shed building guide, build a shed yourself, garden shed plans, DIY shed
- Created: 2026-04-03
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