Photo of second storey extension
Home Building | Renovations

Second Storey Extension

  • Average Cost

    $200,000 - $400,000*

  • Average Sqm


  • Average Cost / Sqm

    $2,000 - $4,000*

  • Typical Contractors

    Surveyor, Architect or draftsman, Structural engineer, Building certifier, Licensed builder

  • Typical Trades

    Carpenter, Electrician, Plumber and drainer, Gasfitter, Concretor, Bricklayer, Waterproofer, Plasterer, Roofer, Tiler, Floor sander, Painter

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Second storey floor extensions are a great way to add more rooms and space cost effectively, and can considerably increase the value of your home.

A second storey extension can be converting an existing roof or attic space to functional storage, or more involved such as adding additional bedrooms, bathrooms, balconies and even living space.

As the price of land increases more people are maximising on their investment by building up. Costs will depend on the materials and extent but can range from $2,000 to $4,000* per square meter. An average second storey floor extension will cost between $200,000 and $400,000*.

Reasons for a second storey extension can include:

  1. Gain more space without moving homes
  2. Not eating into your available outdoor area
  3. Potential of views
  4. Increasing the resale value of your home
  5. Building a retreat space
  6. Increasing storage space
  7. Adding curbside appeal
  8. Alternative to a granny flat
  9. Changing or growing family

What to consider

When tackling a second storey extension items to consider are:

  • Goals, budget and time frame
  • Council approval and regulations
  • Detailed designs, plans and drafts
  • Ceiling height
  • Stair cases and access
  • Natural and artificial lighting
  • Structural load and beams
  • Waterproofing
  • Roofing
  • Insultation, heating and cooling
  • Privacy and neighbours
  • Construction materials and external facade
  • Electrical
  • Plumbing and drainage
  • Options for living on premise during the construction process

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