Greg

Costello

With more than 45 years of Brighton real estate experience, Greg is recognised for his exceptional market knowledge, trusted advice and highly respected auctioneering skills. A third-generation estate agent and Certified Valuer, Greg combines professionalism, integrity and deep local expertise to guide clients confidently through every stage of the sales process.

How has your career led you to the role you're in today? Real estate is in my blood. As a third-generation agent, I've spent my life in the industry, from working as an API Valuer and expert witness to helping clients achieve exceptional property outcomes. Today, I focus on what I enjoy most: building relationships and bringing deals together. What's your personal connection to the neighbourhood? Bayside has been home my entire life. I attended local schools, raised my four children here and have spent decades involved in the community. Having lived, worked and sold property throughout the area, I have a genuine understanding of the people, lifestyle and values that make Bayside unique. Tell us about any community initiatives you're proud of? I've always enjoyed giving back to both the community and the real estate industry. Over the years, I've held leadership roles with local schools, clubs and the REIV, while also contributing through industry education and mentoring. Supporting others and staying involved has always been important to me.

Reviews

4.00

Greg has a 4.00 star rating, according to realestate.com.au.

Last updated: June 2026

Greg kept me well informed and was very professional. Greg's knowledge of the local market was excellent. I was very happy with the service Greg provided and would recommend Greg to others.

Ann H

Mr Costello turned out to be a wonderful buyers advocate, unfortunately I was the expletive vendor!

Umberto S

Greg was such a pleasure to deal with, not just because of his knowledge of the market, but also because of his personable manner. Greg has a wealth of experience as an agent and ensured that the purchase process was stress free for us. We were given timely and relevant information in order to confidently buy our new home. Many thanks!

Rita M

Greg was most professional . His guidance through the process was most helpful.

caroline a

Frequently Asked

Here to help

Your Buxton agent will cover the details - here’s a clear view of what an appraisal involves.

We approach appraisals as a practical conversations, grounded in real data, local insight and what matters most to you.

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Your Buxton agent visits your property, considers its features, location, and market conditions, and combines that with recent sales data to give you a clear, realistic view of its value.

We analyse comparable properties, current market trends, and your home’s unique qualities. From there, we provide a considered range that reflects what buyers are likely to pay.

Not at all. An appraisal is simply insight - a way to understand your home’s value and your options before making any decisions.

Typically, we recommend an in-person appraisal so we can assess your property fully. In some cases, a virtual appraisal can provide a helpful initial guide.

Agents weigh factors differently - recent sales, market conditions, and property features. At Buxton, we combine local insight, data, and experience to provide a balanced, realistic appraisal you can trust.