Sydney's only genuine
fixed price granny flat Specialist

We provide a premium concept to completion service that delivers quality and style above and beyond your expectations

Beautiful Granny Flat designs that will redefine what you thought was possible

Fixed Price Granny Flats are granny flat builders in Sydney specialising in 1 to 3-bedroom Granny Flats, Custom Granny Flats, and Luxury Granny Flats.
We always deliver on a fixed price, on time, and at the highest quality possible.


Building your Granny flat won't be farmed out to an independent builder because we are the builder, fully licensed and accountable from concept to completion.


We offer a clear, transparent Preliminary Approval Package that will deliver a fully Fixed Price. We do this BEFORE you are committed to a contract.


Building a Granny Flat on your existing property can provide an exceptional rental yield, with Granny Flat rental prices up to $650 per week, sometimes even more. It's an outstanding source of additional income.

20 Years Experience

Unbeatable 10 Year Structural Guarantee

Our Granny Flat Designs

What People Say?


I engaged Greg Messer from Fixed Price Granny Flats to build us a 60 square metre Granny Flat, which is now complete and we are very, very happy with the end result. The roofing is excellent, the timber treated frame complete with brick veneer finish. We are very happy with the end result and have…

Leonard & Swaanee Smith Castle Hill

The experience we had was a great experience. We wanted an attached Granny Flat that matched our house and did not look like an addition, but looked like it was always there. Greg and the boys did an incredible job in making sure that it all matched up and connected well. Our neighbours walk past…

John Iuliano Oxford Falls

Greg Messer was the only builder who was able to give me a Fixed Price. I rang Greg at 6am, he answered the phone and came over that day. Greg did the entire approval package for me and at the end of that process I was given a Fixed Price. The bathroom and kitchen are…

Chris Bull

The overall experience was excellent from the start. One of the key considerations I was looking at was the ability of the Contractor to deliver the project on our very steep site. Greg and his team delivered on this and on price. The trades were excellent, handling considerable challenges in a transparent and collaborative way.…

Ezio Di Giovanni Denistone

PLEASE DO NOT sign a contract until you've spoken to us - many competitors will NOT BE GIVING YOU A GENUINE FIXED PRICE!