We're not just better, We're different

In House Granny Flats is an established company with over 25 years of experience in the construction industry. We are located in Castle Hill and specialise in the design, approval and construction of Granny Flats and duplexes across the Sydney metropolitan and Central Coast. We allow property investors to increase their rental income, as well as providing affordable rental housing solutions.

Free Granny Flat Information Night

Thinking about building a beautiful new Granny Flat? Well InHouse Granny Flats can help you make the right decisions and pay off your mortgage sooner!

Our Next Information Night:

Topic: Can I build a Granny Flat on my property?
Wed 5th September 2018
Time: 6:45pm to 8pm
Address: 2/22 Hudson Avenue, Castle Hill, 2154

*Seats are limited, so Book Now!

InHouse Open Homes

We Are Built On Reputation

InHouse Granny Flats provide a specialist tour of recently completed granny flats in your area.

Join our staff on site for a guided tour of the property so you can get a better understanding of the quality and services we offer.

Open Home

InHouse welcomes you to view our recently built granny flat this Saturday, 17th of November .


37 Kent Street, Epping ( 60 Sqm Brick Veneer Granny Flat ) : 10:00am – 1:00pm

Come and walk through a fully completed granny flat and experience the modern touches and appeal. Our experienced staff will guide you through the granny flat and answer any questions you may have.

To register your interest, please email us at [email protected] or submit the form opposite.

Getting Started


View Our Designs

At InHouse Granny Flats we understand that every person is different. We know that a set design may not be to your liking. Unlike other companies, we allow every client the opportunity to specifically design their own layout.



Visit Our Gallery

Since its inception over 5 years ago, InHouse Granny Flats has serviced hundreds of families across Sydney. Our high standard granny flats at affordable costs has built our reputation, spreading word of mouth that we’re not better, we’re different!



FREE On-Site Consultation

We will visit your site to discuss all your options. This includes your site conditions, connections to stormwater, sewer, electricity, gas and water. A detailed fixed price fee proposal will then be prepared for you with no hidden costs.



Tailored Service

Let us tell you how we are different from the rest ...

InHouse Granny Flats will return your call 24 hours from receiving your online enquiry.

InHouse Granny Flats will then carry out a free site inspection and provide you a detailed fixed price fee proposal with no hidden costs. We will disclose everything to you up-front in detail.

InHouse Granny Flats only charges $6,500 for your granny flat approval and only $2,000 upfront to get started. The remaining balance will be paid once we have completed your approval.

In the event we cannot get your granny flat approved, InHouse promise a 100% money back guarantee*

Granny Flat Information Night