FeedingTrends
a month ago
3 min read

10 Things You Need to Know Before Starting a House Extension

Thinking about a house extension? Whether you're planning to add a second storey or simply expand your living room, it’s a big investment that requires smart planning. A well-executed extension can transform your home’s layout, increase its value, and give you the space your family needs—without the hassle of moving.

Before you dive in, here are 10 essential things to know before starting your house extension project.

1. Know Why You're Extending

Start with a clear purpose. Are you adding more bedrooms for a growing family? Creating a home office? Improving resale value? Your “why” will guide your design choices, layout, and even how much you're willing to spend.

2. Understand What Type of Extension You Need

Not all house extensions are the same. Options include:

  • Single-storey extensions (usually at the rear or side of the house)

  • Second-storey additions

  • Garage or loft conversions

  • Wraparound extensions

Choose the one that best suits your space, budget, and long-term goals.

3. Check Local Council Regulations

Before sketching plans or hiring builders, check what’s legally allowed on your property. Local councils have rules about:

  • Setbacks

  • Maximum height

  • Heritage overlays

  • Floor area ratios

A quick call to your local planning office can save time and headaches down the track.

4. Set a Realistic Budget (And Add a Buffer)

Home extensions often cost more than homeowners expect. A rough guide:

  • Basic extensions: $2,500–$3,500 per m²

  • Second-storey additions: $3,000–$4,500+ per m²

Don’t forget design fees, permits, temporary living costs, and a contingency buffer (10–15%) for unexpected surprises.

5. Design for Flow and Functionality

It’s not just about adding space—it’s about making your home work better. Focus on:

  • Open-plan living

  • Improved room connections

  • Natural light

  • Indoor-outdoor access
    Think about how the extension will integrate with the existing structure and improve your day-to-day living.

  • 6. Choose the Right Professionals

    Depending on the project, you may need:

    • An architect or building designer

    • A draftsperson

    • A structural engineer

    • A licensed builder

    Always check credentials, reviews, and past work. A good team can make or break your renovation experience.

  • 7. Get Detailed Plans and Fixed Quotes

    Once your design is finalised, get detailed construction drawings and request quotes from multiple builders. A fixed-price contract helps avoid cost blowouts and makes budgeting easier.

  • 8. Think About Timing

    Home extensions can take anywhere from 3 to 9 months depending on complexity. Weather, trades availability, and council delays can all affect the schedule. Plan ahead—especially if you need the space by a certain date (e.g., baby on the way or guests arriving).

  • 9. Prepare for Disruption

    Even with the best team, living through a house extension can be messy and noisy. Dust, blocked access, and temporary inconvenience are part of the deal. Some families choose to move out during major works—especially for second-storey builds.

  • 10. Prioritise Quality Over Shortcuts

    It’s tempting to cut corners to save money—but poor workmanship or cheap materials can lead to issues later. Prioritise quality insulation, waterproofing, structural integrity, and long-lasting finishes. A well-built extension not only adds space but increases your home's long-term value.

  • Final Thoughts

    House extensions are an exciting way to upgrade your lifestyle and add serious value to your home. With the right planning, team, and mindset, your project can run smoothly and result in a space your family will love for years to come.

    Take your time to research, plan, and prepare—because building more space shouldn't mean more stress.

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