Extensions — Corinthian Builds

Home extension with new living area and seamless indoor-outdoor connection

Extensions

More space, seamlessly integrated with your existing home.

When your family grows or your lifestyle changes, an extension is often the smartest way to gain the space you need without the disruption of moving. Corinthian Builds specialises in extensions that feel like they were always part of the original home.

Our extensions team has extensive experience working with existing structures — matching materials, aligning rooflines, and ensuring the new addition integrates seamlessly with what's already there. From ground-floor rear extensions to second-storey additions, we handle the full process including structural engineering, council approvals, and all trades.

What's Included

  • Structural engineering and design coordination
  • Council development application and approvals
  • Demolition of existing walls and openings
  • New structural framing and roofing
  • External cladding and window installation
  • Internal fit-out to match existing finishes
  • Electrical and plumbing extensions
  • Painting, flooring, and final finishing

Project Timeline

6–12 weeks

Design & Approvals

Structural design, council DA lodgement, and approval.

1–2 weeks

Preparation

Site setup, demolition of existing elements, and structural openings.

4–8 weeks

Structure & Lock-Up

New framing, roofing, cladding, windows, and weatherproofing.

4–8 weeks

Fit-Out & Finishing

Internal linings, joinery, wet areas, flooring, and painting.

Pricing Guide

Extensions are priced based on size, complexity, and the level of integration required with the existing structure. Ground-floor extensions typically start from $80,000, while second-storey additions start from $150,000. All projects are quoted on a fixed-price basis.

All prices are indicative and subject to a formal site assessment and quote.

Ready to get started? We'll provide a detailed, fixed-price quote after a no-obligation site assessment.

Enquire About an ExtensionOr call us: 0428 874 047