Introduction

Building a deck frame is the most important part of your deck — get this right, and everything else becomes easier.

A solid frame ensures:

• Structural strength
• Long-term durability
• A level, professional finish

In this guide, we’ll walk you through exactly how to build a deck frame — the right way.

? If you haven’t already, read our Deck Fasteners Guide 

How do you build a deck frame?

To build a deck frame, you install posts and bearers, attach joists at correct spacing, secure all structural connections with bolts, and ensure the frame is level and square before laying decking boards.

Step 1: Set Out & Measure

• Mark your deck area
• Use string lines for accuracy
• Check square using diagonal measurements

? Accuracy here saves major issues later

Step 2: Install Posts

What to use:

• Treated timber posts
• Anchor bolts / post brackets

? Shop Anchor Bolts & Fixings 

Tip:

Posts must be:

• Plumb (vertical)
• Set at correct depth

Step 3: Install Bearers

What to use:

• Structural bolts
• Washers + nuts

? Browse Structural Bolts 

Bearers run across your posts and support the joists.

Step 4: Install Joists

Standard spacing:

• 450mm centres (common in Australia)

What to use:

• Joist hangers or bolts
• Structural fixings

? Shop Joist Fixings & Fasteners 

Step 5: Secure All Connections

This is where strength comes from.

Use:

• Galvanised bolts
• Correct torque
• Matching hardware

? Browse Galvanised Bolts

Step 6: Check Level & Square

• Use a spirit level
• Check diagonals
• Adjust before decking

? This step determines how professional your deck looks

⚠️ Common Mistakes

Incorrect Spacing

Weakens the structure.

Skipping Galvanised Hardware

Leads to rust and failure.

Not Checking Level

Creates uneven decking later.

✅ Deck Frame Checklist

Before moving on:

• ✔ Posts installed correctly
• ✔ Bearers secured with bolts
• ✔ Joists evenly spaced
• ✔ All fixings tightened
• ✔ Frame level and square

❓ FAQ SECTION

Frequently Asked Questions

What spacing should deck joists be?

Typically 450mm centres in Australia.

Do I need bolts for a deck frame?

Yes, bolts are required for structural connections.

Can I use screws instead?

not recommended for structural components — bolts are stronger.

What is the best fastener for deck framing?

Galvanised structural bolts are the best choice.