Ray White United Group | St Marys

200 Queen Street, St Marys, NSW, Australia 2760
  •   5   (1111 reviews)

Our sales performance at a glance

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

249
Reviews
154
Properties for sale
630
Sold properties
$993k
Average sale price
$625.4m
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.

  • aotybadge

    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   (519 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.
View ProfileRateMyAgent AchievementspriceExpertbadgeaotybadge
Joshua Cassells
Joshua Cassells

Licensed Real Estate Agent / Sales Executive

  5   (471 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!
View ProfileRateMyAgent AchievementspriceExpertbadge
Bianca Rossetto
Bianca Rossetto

Sales Executive

  5   (197 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.
View ProfileRateMyAgent AchievementstrustedbadgepriceExpertbadge
Eli Alkassar
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
View ProfileRateMyAgent AchievementspriceExpertbadge
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
View ProfileRateMyAgent AchievementspriceExpertbadge
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
View ProfileRateMyAgent AchievementstrustedbadgepriceExpertbadge

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.

Social profiles

Our reviews

  5  
1121 reviewsacross 50 different locations, showing 6.
Our qualities as told by our client reviews: great negotiation, honest, supportive, reliable, responsive, local expert, clear communication.
Was this helpful?
Seller review
Excellent communication, AAA+++ plus service
about 23 hours ago
Excellent communication, AAA+++ plus service

Excellent work from Josh and the team from start to finish, amazing result, I would recommend Josh and the team to anyone selling.

Joshua Cassells

Joshua Cassells

  5   (471 reviews)
Seller review
Excellent communicator with the whole process.
1 day ago
Excellent communicator with the whole process.

We are very impressed with the whole process of selling our home. Charlie is very professional young man in a real estate industry knowledge. He explained the process the easiest way for us to understand. Good manners and always on time for all the updates. We are very thankful to Charlie for all his hard work: very well done and highly 100% recommend. All the best.

Charlie Stoffers

Charlie Stoffers

  5   (8 reviews)
Seller review
Great result, Highly recommend Peter and his team.
3 days ago
Great result, Highly recommend Peter and his team.

We recently sold our house with the help of Peter and his team, and we couldn’t be happier with the experience. Peter and his team were professional, considerate, and worked incredibly hard to achieve the best possible result for us. Their communication throughout the entire process was excellent, we were always kept informed and felt supported every step of the way. We truly appreciated their dedication and would highly recommend them to anyone looking to buy or sell a home.

Peter Diamantidis

Peter Diamantidis

  5   (519 reviews)
Seller review
I thought Labour budget screwed us. Josh saved the day!
4 days ago
I thought Labour budget screwed us. Josh saved the day!

Josh helped us understand the market during uncertain times. Gave us very accurate market information and confidence. He also provide us timely update on what buyers are up to. Josh also relays my message faster than my Wife! With no spelling mistake!

Joshua Cassells

Joshua Cassells

  5   (471 reviews)
Buyer review
Kind and Awesome professional to deal with.
4 days ago
Kind and Awesome professional to deal with.

As first home buyer, shumi was excellent to deal with. She was ready to offer all support to guide me through the process , giving all details with clarity. Will recommend her for all my friends for future purchases.

Shumi Chauhan

Shumi Chauhan

  5   (27 reviews)
Seller review
Excellent communication, transparent, great sales skill
5 days ago
Excellent communication, transparent, great sales skill

Josh helped us sell our first home, never regret choosing him! He is professional, punctual, strong working ethic, responsive! Most importantly, he managed to sell our house in a great price. Looking forward to doing more business with Josh in the future!

Joshua Cassells

Joshua Cassells

  5   (471 reviews)
Show all 1121 reviews
map

Our properties

Ray White United Group | St Marys has 154 properties for sale and sold 630 properties in the last 12 months, showing 4, sorted by most recent activity

SoldJun 6, 2026
$452,500
910/12 East Street
Granville NSW 2142
1
1
1
Unit
For Sale
$770,000 - $800,000
9/50 Irwin St
Werrington NSW 2747
3
1
2
Villa
For Sale
Pre Market Opportunity
62 Lamonerie Street
Toongabbie NSW 2146
4
2
2
House
For Sale
FOR SALE
46/11 Glenvale Ave
Parklea NSW 2768
3
2
1
Unit
Show all 784 properties
© 2026 RateMyAgent