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About Us

Our Mission

To provide reliable property cleaning and preparation services through organised processes, clear communication and consistent attention to the agreed scope.

Our Vision

To build a trusted metropolitan Sydney property-services business known for dependable delivery, accountable communication and long-term client relationships.

Our Core Values

Reliability — We take bookings, access arrangements and agreed deadlines seriously.Professionalism — We treat each property and client interaction with care and respect.Accountability — We communicate clearly and address issues rather than allowing them to remain unresolved.Consistency — We use structured service requirements and completion checks.Transparency — We clearly explain the agreed scope, inclusions and available optional services.

Why Clients Choose Cornerstone

Our property ready standards support more than a clean result. Clients can receive completion confirmation, photos, presentation checks, and damage or maintenance observations where applicable. We provide responsive communication and personalised support. Fast response times, consistent quality, and transparent reporting allow us to build long-term partnerships with real estate agencies, and building and construction companies.
Why Clients Choose Cornerstone

Meet the Founders

Jonathan oversees daily operations, quality control, and client relationships. His focus on reliable systems and clear communication helps ensure every property meets Cornerstone’s professional standards.

Jonathan Yassa

Co-Founder | Operations and Client Services
Sara leads business development, client experience, and continuous improvement. She works to ensure every client receives a professional and dependable service from enquiry through to completion.

Sara Nissan

Co-Founder | Business Development and Client Experience

Confidence in Every Property

Cornerstone Cleaning combines organised processes, responsive support, and high presentation standards to help you keep your property ready.

Partner With a Team That Takes Accountability Seriously

Speak with Cornerstone Cleaning about your property requirements and receive a fixed, no obligation quote.
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