Ray White United Group | St Marys - Verified Reviews & Real Estate For Sale

Our sales performance at a glance

See how Ray White United Group | St Marys has performed in the last 12 months on RateMyAgent*

213

Reviews

150

Properties for sale

615

Sold properties

$982k

Average sale price

$604.2m

Total sales value

*Includes all properties sold (last 12 months) as lead and supporting agent and published on ratemyagent.com.au. It may not be complete and can exclude off-market, private sales and undisclosed pricing and sold dates. Contact agent for full sales history.

Our customer service awards

See what RateMyAgent awards Ray White United Group | St Marys has won

National Top 100Australia
State Top 10New South Wales
Suburb WinnerClaremont Meadows
Suburb WinnerColyton

4x Suburb WinnerOxley Park - 2026, 2025, 2024, 2023
4x Suburb WinnerSt Marys - 2026, 2025, 2024, 2023
3x National Top 100Australia - 2026, 2025, 2024
3x State Top 10New South Wales - 2026, 2025, 2024

Meet the team

Get to know the 15 agents at Ray White United Group | St Marys.

Peter Diamantidis

Director / Licensee / Principal

(528 reviews)

About Peter

Peter Diamantidis is the Founder and Selling Principal of Ray White United Group, which has grown to eight thriving office locations across St Marys, St Clair, Mount Druitt, Rooty Hill, Marsden Park, Glenwood, Arndell Park & Toongabbie. Working in real estate since the age of 15 Peter started in property management then moved into sales which has won an avalanche of awards ranking him in the top of 5 agents in NSW for a number of years and a high volume agent averaging 200 - 300 transaction every year. In 2021 - 2025 Peter was ranked in the top 5 real estate agents in NSW through realestate.com.au out of over 9,000 real estate agents. Peter’s exceptional attention to detail, dynamic energy and impressive negotiation skill sets him apart from his competitors with different ways to combat any situation nothing too small or too big. In 2017,2018,2019,2020,2021,2022,2023,2024,2025 Peter was ranked in the top 100 agents throughout Australia by REB which is an incredible result. With over 22 Years experience, Peter started in real estate at the age of 15 after leaving school. Starting from the bottom has given Peter a comprehensive understanding of every facet in relation to a property sales transaction and has allowed him to develop an ability to get a deal together and deliver for his clients in a way that few agents can. Peter is also a popular property commentator for National Nine News, Channel 7, Australian Property Magazine, The Daily Telegraph, Sydney Morning Herald, Your Property Magazine, The Australian and many more. “ Specialising in properties across Western Sydney & The Hills, with a strong passion in dealing with development blocks and off the plan developments, Peter’s market knowledge and dedication combined with the support of his team, ensure his clients are provided with an incredibly professional real estate experience every time.

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Joshua Cassells

Licensed Real Estate Agent / Sales Executive

(482 reviews)

About Joshua

Meet Josh Cassells, a top-performing real estate agent known for his exceptional service, unparalleled expertise, and commitment to his clients. With years of experience in the industry, Josh has established a reputation as one of the most knowledgeable and trusted agents in the market. He takes a personalized approach to every transaction, ensuring that each client receives the attention and care they deserve. Josh is a master of negotiations and has a proven track record of securing the best deals for his clients. He has a deep understanding of the local real estate market and stays up-to-date on the latest trends and developments, allowing him to provide his clients with the most accurate and relevant information. His ability to effectively communicate and listen to his clients' needs sets him apart from the competition. Josh is also known for his integrity and honesty. He places the needs of his clients above all else and always operates with their best interests in mind. He believes in building long-lasting relationships with his clients and strives to make the home buying or selling process as seamless and stress-free as possible. Whether you're buying your first home, upgrading to a larger property, or looking to sell, Josh is the real estate agent you can count on. With his passion for real estate, exceptional customer service, and wealth of knowledge, he will help you achieve your real estate goals. Get in touch with Josh today to experience the difference a dedicated and experienced real estate agent can make!

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Bianca Rossetto

Sales Executive

(202 reviews)

About Bianca

Bianca is an Award Winning BDM, with a track record of happy clients and outstanding customer service, she is passionate, dedicated and enthusiastic in all areas of Sales & Property Management. Having been both a tenant and a landlord, she understands the importance of maintaining an ethical and professional approach. She has an unparalleled knowledge of the real estate industry with over 24 years in the field of property management, sales and advertising.

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Eli Alkassar

Sales Executive

4.9

(118 reviews)

About Eli

Eli is known for his ability to expertly deliver on his clients’ property goals as well as his vibrant, energetic approach to Real Estate. His family background is enriched with local area history, providing him with a valuable insight into what makes our area so unique. With a warm and friendly nature, high attention to detail and always delivering the best results for his clients, Eli is a great asset in his role as Sales Executive in the Ray White St Marys team. Using his knowledge about the property market combined with his communication skills Eli is able to always deliver the best results for his clients. He is driven to positively influence the lives of the vendors, buyers and investors he engages with. Awards 2024/2025 - Elite Performer 2024/2025 - Premier Performer 2023/2024 - Elite Performer 2023/2024 - Premier Performer 2022/2023 - Premier Performer

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Roy Sidhu

Sales Agent / Sales Executive

(61 reviews)

About Roy

Looking for an agent who gets results without the high-pressure tactics? Look no further! Sellers choose Roy as their go-to agent because he brings a refreshing approach to the table. With an easy-going and approachable demeanor, he makes the selling process a breeze. He understands that your needs comes first, and he works tirelessly to achieve the best outcome for you. When it comes to getting the job done and delivering exceptional results, he is the agent for you. Living in Quakers Hill himself alongside his family, Roy is inspired to support his clients and keep the process of selling and purchasing a home as seamless as possible. His community involvement with local schools is one of many ways Roy likes to give back to his community. SPECIALITIES Residential Real Estate Specialising in the Quakers Hill & Blacktown area Outstanding Service and Customer Relationship Skills Experienced Negotiator Strong Local Knowledge Can facilitate Hindi, Urdu & Punjabi translation Auction & Private Treaty

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Amber Boumelhem

Sales Executive

(59 reviews)

About Amber

Focused on exceeding her client’s expectations, Amber is a genuine sales professional, delivering outstanding customer care. A skilled communicator she makes everyone feel at ease with her positive, approachable, and professional attitude. Having previously worked as a property officer she is experienced in dealing with landlords and tenants enjoying the trust and responsibility of protecting people’s investments and getting satisfaction from guiding people to the right rental for them. She is a valued and committed member of the Diamantidis Group team. Since Amber has joined the team her record of 17 sales in one month has been a major highlight in her short career in sales.

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About us

Welcome to Ray White United Group — your trusted local property experts, proudly serving Western Sydney and The Hills District. Since opening our first office in St Marys, we’ve grown to become a leading real estate network with six offices across the region, offering a full suite of property services to our valued clients and communities. Our experienced team is passionate about delivering outstanding service, combining genuine local knowledge with the strength of the Ray White brand. Whether you're buying, selling, investing, or leasing, we’re here to guide you with honest advice, expert market insight, and a personal touch that sets us apart. We’re proud to call Western Sydney and The Hills District home and are dedicated to supporting the people and neighborhoods we work in every day. Discover the Ray White United Group difference — where community, care, and results come together.

Seller review

1 day ago

Excellent communication and honesty

- always available for discussion - friendly - great explanations - good market knowledge - professional - honest and transparent

Amber Boumelhem

(59 reviews)

Seller review

5 days ago

Queen of Real Estate

Amber was committed from the get-go. She presented her sales strategy with intrinsic scope and detail and delivered a prestige personalised service that has forever touched my heart. Amber's forte is clear and open communication between all parties involved with the buying/selling process. Her professional and calm disposition is impeccable! She is loyal and focused on the goals that were set from the beginning. She is an asset and Blessing to Ray White United Group!

Amber Boumelhem

(59 reviews)

Seller review

9 days ago

Harry has excellent knowledge of how this market goes. He makes suggestions that other people cant

Harry never stop communicating and updating us of what is going on which is a great attitude for an agent. He makes us feel confident that our house will sell and ensures us the campaign is stress free. Our house was SOLD in 3 weeks.

Harry Towner

(9 reviews)

Seller review

16 days ago

Outstanding Service and Dedication from Charlie Stoffers

We are extremely grateful to Charlie Stoffers and the team at Ray White United Group | St Marys for their exceptional service throughout the sale of our property, C201/48 Derby Street. Charlie was professional, hardworking, and supportive from start to finish. His communication was excellent, and he always kept us informed throughout the process. His market knowledge, negotiation skills, and dedication helped make the entire sale smooth and stress-free. We especially appreciate Charlie’s hard work, patience, and commitment in achieving a great result for us. He went above and beyond our expectations, and we are truly thankful for his efforts. We highly recommend Charlie Stoffers to anyone looking to sell their property. Thank you once again, Charlie, for your outstanding service and for making this experience such a positive one!

Charlie Stoffers

(12 reviews)

Buyer review

17 days ago

Roy is helpful, professional, and has excellent local knowledge.

Roy Sidhu made buying our home in Schofields a genuinely smooth and positive experience. He went above and beyond, showing us the property outside inspection times and arranging access for tradies to take measurements before settlement. Roy was always eager to help at every step. I highly recommend him to any buyer.

Roy Sidhu

(61 reviews)

Seller review

29 days ago

Amber is a phenomenal agent with upmost integrity and professionalism!

I have bought and sold many homes in my life and dealt with agents from all over, however, I have never come across someone like Amber. Every aspect of her engagement was 10/10!!!

Amber Boumelhem

(59 reviews)

Our properties

Ray White United Group | St Marys has 150 properties for sale and sold 615 properties in the last 12 months, showing 4, sorted by most recent activity