Deck Footing Installation Guide for Victorian Builders

A deck is only as good as the footings it sits on. Whether you're building a small raised timber deck in a Melbourne backyard or a large entertaining area on a sloping Mornington Peninsula block, choosing the right footing system is the single most important structural decision you'll make. This guide covers everything Victorian builders and homeowners need to know.

Types of Deck Footings

There are four main footing options for decks in Victoria:

1. Concrete Piers

Traditional bored piers filled with concrete and a steel stirrup on top. Requires excavation, concrete delivery, formwork, and 7–28 days of curing before you can build. Still common, but increasingly being replaced by faster alternatives.

2. Precast Concrete Pads

Surface-level concrete blocks placed on compacted ground. Only suitable for low, ground-level decks on stable soil. Not suitable for elevated decks or reactive soils.

3. Screw Piles

Helical steel piles screwed into the ground. Ideal for deeper foundations, sloping sites, and challenging soils. SurePile from BMSA is a popular choice for larger deck projects.

4. Concrete-Free Driven Systems

Engineered steel stumps driven directly into the ground. RapidStump and StumpRite from BMSA Footing Solutions are purpose-built for deck applications. No concrete, no curing — build the same day.

Concrete vs Concrete-Free for Decks

Choosing the Right Footing for Your Deck

The best footing system depends on several factors specific to your project:

• Soil type — Reactive clay soils (common in Melbourne's west) require deeper footings or systems designed to handle soil movement. A soil test is the starting point.
• Deck height — Low decks close to ground level have different footing requirements than elevated decks, which need greater lateral stability.
• Load requirements — A spa deck or one supporting heavy planters needs higher load-rated footings than a simple timber platform.
• Site access — If a concrete truck can't reach the site (common in rear yards with narrow side access), concrete-free systems are the practical solution.
• Slope — Sloping blocks benefit from screw piles (SurePile), which can be installed to varying depths to achieve a level building platform.

Victorian Building Permits for Decks

In Victoria, whether you need a building permit for your deck depends on its size, height, and proximity to boundaries:

• Permit required — Most elevated decks (more than 800mm above ground) and all decks attached to the house as structural additions require a building permit.
• Potentially exempt — Small, freestanding, ground-level decks (no higher than 800mm, not more than 10m², not near a boundary) may be exempt in some councils. Always confirm with your local council or building surveyor.
• Engineering — If a permit is required, your footings must be designed or approved by a structural engineer and comply with AS 2870.

Step-by-Step: Deck Footing Installation

1. Plan and permit — Finalise your deck design, obtain a soil test, and secure a building permit if required.
2. Engineering sign-off — Your engineer specifies the footing type, size, spacing, and depth for each position.
3. Site preparation — Clear the area, remove vegetation, and mark footing positions according to the plans.
4. Install footings — For concrete-free systems, each footing is mechanically driven or screwed into position. This typically takes minutes per footing.
5. Fit brackets — Bearer brackets or connection hardware are attached to each footing head.
6. Build immediately — Bearers, joists, and decking boards can be installed on the same day.

Common Mistakes to Avoid

• Skipping the soil test — Without knowing your soil class, you risk under-specifying footings that won't perform long-term.
• Undersizing footings — Using cheap, undersized footings to save money often leads to deck movement, bouncing, or structural failure.
• Ignoring drainage — Poor drainage around footings can cause soil erosion and footing settlement. Ensure water flows away from the deck area.
• Not checking for services — Always call Dial Before You Dig (1100) to check for underground utilities before any footing installation.
• Building without a permit — Unpermitted deck work can result in fines, required demolition, and problems when selling your home.

Why Builders Choose Concrete-Free Deck Footings

Professional deck builders across Melbourne are increasingly choosing concrete-free systems because they compress the project timeline dramatically. A footing install that previously required a full day of digging and pouring plus a week of curing can now be completed in hours, with the deck frame going up the same afternoon.

For homeowners, this means less disruption to your property, lower total costs, and a finished deck sooner. For builders, it means more projects completed per month and happier clients.

Read our full comparison in Concrete-Free Footings vs Traditional Concrete.