Build your new home

Making the decision to build in many cases is a big commitment, finding the right builder to make your vision come to life is another big commitment and a vital one.  Your builder needs to be a licensed builder, accessible and able to work with your needs, professional and advisable, as well as being passionate about their work and delivering a quality product.

Extensions + Renovations + Additions

You have the property, the right location however you have outgrown your space or have been waiting for the right time to extend or move up. Usually a daunting yet exciting idea, however the team at Coztec ensures to make that process less intimidating. Even with the most complicating renovations we have come across - it has always been impressive seeing the completed project as if it had always been there.

Granny Flats

Family Members need a place to stay? Or maybe you have potential space to build something for an extra investment ? Whatever your reason, adding a granny flat to your home can be an excellent choice. Here at Coztec Constructions, we will make sure you are getting exactly what you want with the extra space. It is our goal to make your vision a reality. From design to color, we promise perfection.



Coztec Constructions is a Sydney based company run by the Builder Adam and supported by his wife and business partner Suzana.


A family run business providing a wide range of carpentry and building services with an emphasis on quality and customer satisfaction. From extensions/renovations to new build homes, we are committed to providing a thorough, reliable and efficient service.


Our services include, new build homes, extensions, additions, granny flats, decks, pergolas, carpentry, kitchen and bathroom renovations demolition and more.


Coztec Constructions services all of Sydney metropolitan and surrounding suburbs + Wollondilly region and surrounding suburbs.


Adam is a licensed builder with years of professional experience, covered by all necessary insurances including Home Warranty Insurance. You deal directly with the builder/owner of the business. All work is guaranteed, Contact us today to arrange a quotation.




Contact us

For any inquiries, questions or commendations, please call: 0422 653 390 or fill out the following form

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Head Office

PO Box 1078,


Tel: 0422 653 390


To apply for a job with Coztec Constructions, please send a cover letter together with your C.V. to:

Get a quote: 0422 653 390