Ray White United Group | St Marys

200 Queen Street, St Marys, NSW, Australia 2760
  •   5   (1088 reviews)

Our sales performance at a glance

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

241
Reviews
148
Properties for sale
612
Sold properties
$999k
Average sale price
$611.2m
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.

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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 16 agents at Ray White United Group | St Marys.

Peter Diamantidis
Peter Diamantidis

Director / Licensee / Principal

  5   (515 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   (466 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   (193 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
Eli Alkassar

Sales Executive

  4.9   (116 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
Roy Sidhu

Sales Agent / Sales Executive

  5   (58 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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Udaya Puttagunta (Krish)
Udaya Puttagunta (Krish)

Licensed Real Estate Agent / Sales Agent / Sales Consultant

  5   (48 reviews)
About Udaya
Meet Udaya Puttagunta (Krish), your licensed real estate agent and trusted advisor. With an impressive 5-star ratings, Udaya is a highly regarded sales consultant known for his expertise and dedication to his clients. Over the past 12 months, Udaya has effectively managed to sell a number of properties, demonstrating his strong track record in the real estate market. His portfolio shows a focus on houses, land, apartments spanned across with an average sale price of over $1 million. Udaya stands out as a price expert, ensuring his clients receive the best deals whether buying or selling. Udaya’s deep familiarity with a number of suburbs ensures he can provide valuable insights and advice tailored to the local market environment. Clients trust Udaya not only for his outstanding market knowledge but also for his unwavering integrity and personalized service. Whether you're a first-time homebuyer or looking to invest, Udaya is dedicated to achieving optimal results for each of his clients. Specialities - Clear and professional solutions on how to get your property sold for the best possible results - Creative with all deals leaving no stone unturned - Excellence - Trust - Service
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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  
1098 reviewsacross 50 different locations, showing 6.
Our qualities as told by our client reviews: great negotiation, honest, supportive, reliable, responsive, local expert, clear communication.
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Seller review
Seamless Sale, Exceptional Service goes Above and Beyond
3 days ago
Seamless Sale, Exceptional Service goes Above and Beyond

If you are looking for a principal agent who truly goes above and beyond, look no further than Joshua Cassells (Josh) Ray White United Group St Marys. Josh was the principal agent overseeing the sale of our property, and from the very first conversation it was clear we were in the best possible hands. His depth of knowledge of the local market, sharp negotiation skills, and calm, professional approach gave us complete confidence throughout the entire process. What sets Josh apart is his ability to make everything look effortless. He managed every aspect of the campaign with precision — from the marketing strategy and open homes through to offers and final settlement — all while keeping us fully informed and at ease every step of the way. Nothing was ever too much trouble, and he was always just a call or message away. Josh's commitment to achieving the absolute best outcome for his clients is evident in everything he does. He is honest, transparent, and genuinely invested in the people he works with — not just the transaction. The result he delivered for us exceeded our expectations, and the entire experience was far smoother than we ever anticipated. Thank you, Josh — you made what could have been a daunting process a truly positive one. We would recommend you to anyone and everyone without hesitation. An absolute credit to Ray White United Group St Marys!

Joshua Cassells

Joshua Cassells

  5   (466 reviews)
Seller review
Professional, Honest & Results-Driven
3 days ago
Professional, Honest & Results-Driven

We cannot speak highly enough of Shumi from Ray White United Group. From our very first meeting, Shumi demonstrated an outstanding level of professionalism, local market knowledge, and genuine dedication that made the entire sale of our home at Glenmore Park an exceptional experience. Shumi guided us through every step of the process with clarity and confidence — from pricing strategy and marketing to negotiations and final settlement. She kept us informed at every stage, always promptly returning calls and messages, and made what can be a stressful process feel completely seamless. What truly set Shumi apart was their personal approach. We never felt like just another listing — Shumi genuinely cared about achieving the best possible outcome for us, and that showed in the result. The property was presented beautifully, attracted strong interest, and sold in an impressive timeframe. If you are looking for an agent who combines market expertise with honest communication and a tireless work ethic, look no further than Shumi at Ray White United Group. We would not hesitate to use Shumi again and recommend them to anyone looking to buy or sell in the area. Thank you, Shumi — truly a fantastic result and a pleasure to work with from start to finish!

Shumi Chauhan

Shumi Chauhan

  5   (25 reviews)
Seller review
Excellent and honest communicator and kept me updated throughout the whole process.
6 days ago
Excellent and honest communicator and kept me updated throughout the whole process.

I had an excellent experience working with Peter on the sale of my property. Their communication was honest, clear, and consistent from start to finish. I was kept informed at every stage of the process, which made the entire experience smooth and stress-free. I would highly recommend them to anyone looking for a reliable and professional real estate agent.

Peter Diamantidis

Peter Diamantidis

  5   (515 reviews)
Seller review
Charlie was honest, reliable, and always followed through on what he said
11 days ago
Charlie was honest, reliable, and always followed through on what he said

We had a great experience selling our home with Charlie and the team at Ray White United Group. He was professional, easy to deal with, and always available when we needed advice. His campaign brought strong interest and plenty of buyers through our open homes. Charlie was honest, reliable, and always followed through on what he said. His approach really stood out from other agents and played a key role in getting our property sold. We’d happily recommend him to anyone looking to buy or sell.

Charlie Stoffers

Charlie Stoffers

  5   (6 reviews)
Seller review
Joshua and his team were extremely helpful.
11 days ago
Joshua and his team were extremely helpful.

Joshua and his team made the selling experience so easy and negotiated a great price and sold the property in record time.

Joshua Cassells

Joshua Cassells

  5   (466 reviews)
Show all 1098 reviews
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Our properties

Ray White United Group | St Marys has 148 properties for sale and sold 612 properties in the last 12 months, showing 4, sorted by most recent activity

For Sale
AUCTION | PRICE GUIDE - $850,000
5 Windermere Avenue
Cambridge Park NSW 2747
2
1
House
For Sale
Just Listed
11 Russell Street
Blacktown NSW 2148
4
2
1
House
For Sale
For Sale - Contact Agent
3/517-521 Wentworth Avenue
Toongabbie NSW 2146
3
2
2
Townhouse
For Sale
$800,000 - $850,000
1/24 Paskin Street
Kingswood NSW 2747
2
1
House
Show all 760 properties
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