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Second Storey Additions St Clair – Create More Space Without Moving

With over 20+ years’ experience in Sydney’s north-west, we transform homes to complement our client’s lifestyles and budgets.

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At Keystone Building, we specialise in second-storey additions in St Clair and across Western Sydney. For over 20 years, our family-run business has delivered high-quality home extensions, renovations, and custom builds. Based in Kellyville, we are familiar with the local area, council requirements, and the needs of growing families.

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Who We Are

We provide complete project management—from design and approvals through to completion. With fixed-price contracts and clear timelines, you get certainty and peace of mind.

Preserve Outdoor Space

Build vertically to maintain your backyard, garden, or pool area— ideal for smaller blocks.

Add Views and Light

Second levels can open up elevated outlooks and bring in more sunlight, enhancing both value and lifestyle.

Get More Privacy

Create spacious master suites or quiet study areas completely separated from the main living zone.

Boost Property Value

Second storey additions are a strong investment, often delivering a higher return by substantially increasing usable floor area.

Why Us?

  • We know building can feel overwhelming, which is why clients choose us for our:
    • Local expertise – Family business based in Kellyville, serving Western Sydney.
    • Specialisation – Decades of experience in second-storey and ground-floor additions.
    • Transparent pricing – Fixed contracts with no hidden costs.
    • Low disruption – Most clients remain at home during the construction process.
    • Complete project management – All approvals, trades, and timelines managed in-house.
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How We Can Help

Keystone Building provides a full-service approach to second-storey home additions in St Clair. From the initial consultation through design, approvals, and construction, we handle every step. You'll work with one point of contact while we coordinate trades, suppliers, and inspections.

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Why Second Storey Additions Work Well in St Clair

  • Homes in St Clair often have limited block size, making building upward more practical than outward.
  • A second-storey extension allows for extra bedrooms, bathrooms, or a parents' retreat.
  • It increases natural light and ventilation, improving the comfort of your home.
  • Adding a second level can significantly boost your property's resale value.

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Facts About Us

Adding a second storey is one of the best ways to expand your home without giving up valuable yard space. Whether you need more bedrooms, a new bathroom, or a larger living space, it's a wise choice for families who love their location but require additional room.

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What to Expect During the Build

  • Most clients stay in their homes while work is completed.
  • Our team ensures daily cleanup and safe work practices.
  • We manage council approvals, engineering, and structural requirements.
  • Fixed-price contracts include penalty clauses for late completion.

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About Us
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Experience You Can Trust

  • 20+ years specialising in first-floor additions and double-storey extensions.
  • Hundreds of successful projects across Western Sydney suburbs.
  • Known locally as "the second-storey addition specialists."
  • Partnerships with leading suppliers such as James Hardie and Beaumont Tiles ensure high-quality finishes.

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