Ray White United Group | St Marys

200 Queen Street, St Marys, NSW, Australia 2760
  •   5   (1177 reviews)

Our sales performance at a glance

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

182
Reviews
160
Properties for sale
598
Sold properties
$968k
Average sale price
$578.8m
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.

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    Recognised for going above & beyond for their clients.

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
Peter Diamantidis

Director / Licensee / Principal

  5   (530 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
Joshua Cassells

Licensed Real Estate Agent / Sales Executive

  5   (484 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
Bianca Rossetto

Sales Executive

  5   (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 29 years in the field of property management, sales and advertising.
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Eli Alkassar
Eli Alkassar

Sales Executive

  4.9   (119 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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Amber Boumelhem
Amber Boumelhem

Sales Executive

  5   (64 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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Roy Sidhu
Roy Sidhu

Sales Agent / Sales Executive

  5   (64 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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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.

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Our reviews

  5  
1187 reviewsacross 50 different locations, showing 6.
Our qualities as told by our client reviews: dedicated, honest, supportive, reliable, responsive, local expert, clear communication.
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Seller review
Great agent that goes above and beyond.
4 days ago
Great agent that goes above and beyond.

Josh is very professional. He sets clear goals and works very hard to achieve those goals. His communication, market knowledge and negotiation skills are second to none!

Joshua Cassells

Joshua Cassells

  5   (484 reviews)
Seller review
Excellent service and dedication
10 days ago
Excellent service and dedication

She worked extremely hard to sell our property, even in a challenging property market. She kept us well informed throughout the entire process and was always professional, knowledgeable and approachable. We were very happy with her service and would gladly recommend her to anyone looking for a reliable and dedicated real estate agent.

Amber Boumelhem

Amber Boumelhem

  5   (64 reviews)
Seller review
Exceptional Agent
13 days ago
Exceptional Agent

I cannot recommend Amber highly enough! Having originally bought this property from her, choosing her to sell it was the easiest decision—and she exceeded every expectation. Selling in today’s challenging market without advertising in popular sites felt like a tall order, but Amber made it happen. Her communication was seamless, her positive outlook was infectious, and her expert advice on how to present and market the property was spot on. Thanks to her strategy, we secured a fantastic price. What truly sets her apart is how far she goes for her clients. When she was the agent that sold us the property she went completely above and beyond to manage a very challenging tenancy situation, ensuring the tenants transitioned out and the property was beautifully cleaned for settlement. If you want an agent who is brilliant to deal with, highly strategic, and willing to do the heavy lifting, look no further than Amber.

Amber Boumelhem

Amber Boumelhem

  5   (64 reviews)
Seller review
Peter was exceptional at his job.
14 days ago
Peter was exceptional at his job.

I do mean what I said in the title. Peter and his team were exceptional in their job. Communication was flawless. There were times when we were a bit nervous during the sale of our property, especially given the market conditions that we faced during the latter half of 2026. However, Peter gave us some great advice throughout the whole way. We didn't get the sale price that we were hoping for. However, this wasn't due to Peter. It was very much down to market conditions at the time. If the market was any better, I feel like, with Peter's help, we would have got a hell of a lot more. From the moment we met him, in terms of going through everything, we never felt that we weren't handled with professionalism or care in the sale of our property. Highly recommend Peter and his team.

Peter Diamantidis

Peter Diamantidis

  5   (530 reviews)
Seller review
Very good communication skill and well presented
18 days ago
Very good communication skill and well presented

Yousf explained his marketing in good detail and explained how he will bring buyers for my house. He was very active and could find a right buyer for a short time

Yousef Hakimi

Yousef Hakimi

  5   (14 reviews)
Seller review
Outstanding Service – Highly Recommend Amber
22 days ago
Outstanding Service – Highly Recommend Amber

We had an absolutely wonderful experience working with Amber Boumelhem during the sale of our property. From the very beginning, Amber demonstrated exceptional professionalism, dedication, honesty and genuine care. What impressed us most was her willingness to go above and beyond to make the entire selling process as smooth and stress-free as possible. She patiently explained every step, helped us understand the procedures involved and provided valuable guidance whenever we needed it. Her communication was excellent, and she always made us feel comfortable, informed and confident throughout the journey. Amber is not only hardworking and knowledgeable but also genuinely committed to achieving the best possible outcome for her clients. Her positive attitude, attention to detail and dedication truly made a difference to our experience. We sincerely appreciate all the time, effort and support Amber provided. It was a pleasure dealing with someone who takes such pride in her work and genuinely cares about her clients. Thank you so much, Amber, for your outstanding service and commitment. We are extremely grateful and would highly recommend you to anyone looking for a trustworthy, professional and dedicated real estate agent. Definitely a well-deserved five stars

Amber Boumelhem

Amber Boumelhem

  5   (64 reviews)
Show all 1187 reviews
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Our properties

Ray White United Group | St Marys has 160 properties for sale and sold 598 properties in the last 12 months, showing 4, sorted by most recent activity

For Sale
Auction Guide $1,300,000 - $1,350,000
43 Bryson St
Toongabbie NSW 2146
3
1
3
House
SoldNov 12, 2026
$740,000
35 Forrester Rd
Lethbridge Park NSW 2770
3
1
1
House
SoldNov 12, 2026
$362,000
G7/7B Olive Street
Seven Hills NSW 2147
1
2
Studio
For Sale
$900,000 - $990,000
56 Henry Lawson Avenue
Werrington County NSW 2747
3
1
2
House
Show all 758 properties
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