A bit about us

The doors of our Thames / Coromandel franchise opened in May 1999 and is independently owned and operated by Jeff de Leeuw & Glenn Sonntag, Directors of De Leeuw Coastal Construction Ltd.

Jeff de Leeuw was brought up in the building industry. He also has an extensive background in civil engineering, having worked as a Consultant Engineer and for Transit New Zealand. Jeff joined the G.J. Gardner team in 2000 and then went on to purchase the Thames / Coromandel franchise in 2002. Glenn Sonntag is a qualified builder and has been in the business since 2003. Glenn is the General Manager and through his vast residential construction experience is completely dedicated to providing exceptional quality houses.

At G.J. Thames / Coromandel, the team understand that you are an individual and you have unique requirements when building a home. By working together with you they can design and build a home that suits you, your lifestyle and your needs.

They have a wealth of local building experience and knowledge to offer you. Combining this with "New Zealand's most trusted home builder", they have built a reputation that ensures that all customers will receive excellent service, quality workmanship and quality product. It is the commitment to our customers that has made G.J. Gardner Homes the success it is today.

"We pride our business and personal reputation on providing a high quality product with exceptional service. We are confident you will enjoy building your special home with our dedicated team"

- Glenn Sonntag

Call in for a coffee and informal chat. The team would love the opportunity to meet you!

Whitianga, Whangamata, Thames, Paeroa, Coromandel & Waihi Beach are just some of the areas they build in.


LBP Logo

From March 1st 2012 changes to the Building Act 2004 mean that building work of homes affecting the structure or water envelope (as when building new homes), will be classified as Restricted Building Work and is required to be carried out by competent, appropriately licensed building practitioners. At G.J. Gardner Homes, all of our franchises operate within the requirements of Licensed Building Practitioners. If you require any further information about licensing please click the logo above to go to the Licensed building practitioners (LBPs) website website.

Thames / Coromandel
Proud supporters of our community

Local sponsorship and support is very much a focus of Glenn & Jeff and includes:

  • New Zealand Coastguard - G.J. Gardner sponsors the Whangamata dedicated rescue boat. It is called the G.J. Gardner Ranger and the Office Manager, Kris Glucina is one of the head skippers.
  • New Zealand Surf Lifesavers - We sponsor the Whangamata Surf Lifeguards with an annual summer fun series on the beach through January.
  • G.J. Gardner Whangamata Run/Walk Festival - G.J. Thames/Coromandel has sponsored this event for the last 6 years.