House Extension Melbourne

More Space, Exactly Where You Are.

Victorian terrace home renovation in Melbourne featuring a modern concrete and timber rear extension. Design and build project combining heritage façade restoration with a contemporary architectural addition by Box Domus.

Box Domus delivers well-planned, well-built house extensions across Melbourne’s inner and surrounding suburbs.

We design and build extensions that feel like a natural continuation of your home — not something added on later. From rear extensions and open-plan living spaces to double-storey additions, every project is considered from the beginning.

Clear process. Clear pricing. Proper construction.

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Architecture that makes sense.

Modern Melbourne house extension and renovation by Box Domus featuring a sleek black facade, full-height glazing and landscaped rear garden.

We don't do "tack-on" rooms. We build spaces that feel like they’ve always been part of your house. Whether it's a heritage cottage or a modern brick home, we focus on quality work that lasts.

  • Council-Ready: We know the planners in Yarra, Merri-bek, Darebin, Stonnington, Melbourne and Boroondara. We handle the red tape so you don't have to.

  • Built for Living: We prioritize natural light, better airflow, and layouts that actually work for a busy family.

  • Fair Pricing: We provide high-end finishes without the ego or the "designer" markup. You get a premium result for a realistic investment.

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Types of House Extensions We Build

Double-Storey Extensions

Additional bedrooms, bathrooms or living zones designed to integrate with the existing structure.

Heritage Extensions

Extensions to period homes where the front façade remains intact while the rear is modernised.

Rear Extensions

Open-plan living areas, kitchen expansions and indoor-outdoor connections that transform how the home functions.

Side Extensions

Solutions for narrow Melbourne blocks where smart layout planning is essential.

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Our Process — Designed, Approved & Built

A clear, structured process from first idea to final build.

Most architects design without a budget in mind, and most builders struggle with complex plans. We bridge that gap. By managing your extension from the initial sketch to the final structural inspection, we ensure the design is actually buildable and stays within your budget.

We focus on clarity, buildability, and communication at every stage, so your project moves forward without unnecessary complexity or delays.

From navigating heritage overlays in Fitzroy to managing tight footprints in Northcote, we handle the entire project in-house.

The process of designing and building a custom home extension in Melbourne by Box Domus 
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Planning a Home Extension?

Our FAQ page answers common questions about house extensions in Melbourne, including permits, design options, and construction timelines.

View Extension FAQs

Ready to start?

Give us a call or fill out an inquiry from. We can talk through your ideas and give you a straight answer on what's possible for your home.