About Us

Inhouse Granny Flats – Your Trusted Sydney Granny Flat Builder

Inhouse Granny Flats is an established company with over 25 years of experience in the construction industry. We are builders located in Castle Hill who specialise in the design, approval and construction of granny flats in all Sydney areas. Granny flats allow property investors to increase rental income. It also provides an affordable rental housing or extended home for many families.

Our state of the art showroom is one of a kind in the current granny flat market. We display the complete range of our standard inclusions. It allows our clients to gain a better understanding of what Inhouse Granny Flat is offering in comparison to other builders.

Our Inhouse crew consists of:

  • Experienced Granny Flat Builder
  • Qualified Granny Flat Designer
  • Approvals Co-ordinator
  • Construction Manager
  • Account’s Managers
  • Granny Flat Site Supervisors
  • Granny Flat Consultant

The Inhouse Granny Flats crew has a reputation of being one of the best Granny Flat builders in Sydney. We source our premium quality materials from Australian suppliers and we deliver our finished products to your satisfaction. Whatever your reason is for wanting to build a flat, Inhouse Granny Flats can provide you with a turn key home solution that will result in a high quality end product. With a selection of designs to choose from, ranging in sizes from 60sqm upto 80 sqm inclusive of a garage/ alfresco, we have standard granny flat designs or custom designs that can be tailored to better suit your property.

Inhouse about

From your first obligation FREE on-site consultation, all the way through to design, approvals and construction, you can rest assured that you will have the most experienced team working on your granny flat.

Our entire staff is committed to providing you with quality advice and a personalised service. Our labourers, bricklayers, concreters, plumbers, excavators, carpenters, electricians, painters, cleaners, builders, project managers, receptionists, designers, engineers, and architects will be on deck and ready to accommodate your every need.

At Inhouse Granny Flats, we focus on more than just the price, although we do understand that money is an important factor when making a decision on building a granny flat. From your initial enquiry through to handing over the keys, we will guarantee to make it a hassle free operation and an enjoyable building experience.

So if you’re ready to build your granny flat, contact us today and let us handle 100 % of the process. It’s all of this and more that reflect Inhouse Granny Flats’ excellent customer service and exceptional delivery.

Inhouse about page

the process

  • 1. Getting a Quote

    1. Getting a Quote

    The first step to building a granny flat is an enquiry. When you call or email us, we will send you a free information pack so you get a better understanding of what we do. From there, our qualified builder will inspect your backyard free of charge to check the area and discuss your needs and requirements. Our sales representative will then send you a fee proposal, which outlines the necessary requirements for your granny flat as well as its inclusions and overall price.

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  • 2. Flats and drawing stage

    2. Flats and drawing stage

    Once you have accepted the terms and conditions of our fee proposal, provided us with a 10.7 planning certificate (formally known as 149 Certificate) from council, a sewer diagram and you have paid a deposit, we will organise for a surveyor to carry out a site survey on your property.
    Once we have received your survey our qualified Inhouse design team will then draw up a concept floor plan and organise a personalised meeting to sit down with you to ensure your needs are met and any design alterations are made.
    Once you are happy, we will proceed to start your approval with a private certifier or via council.

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  • 3. Contracts

    3. Contracts

    Once your completed approval has been issued by a Private Certifier or Council, we will ask you to sign a Fair Trading Home Building Contract and organise your Home Owner’s Warranty. We will invite you in for a meeting to select all the materials and colours for your granny flat from our wide range of selections available in our showroom.

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  • 4. Construction

    4. Construction

    We will schedule your project to start and order all materials you have selected for the build.
    We will then be on-site organising earthworks, excavation and piering to prepare for the slab.
    You will be appointed a site foreman who will guide and update you throughout the construction until the handover is complete.
    At Inhouse, we know that this investment is important to you and we do our best to finish construction as soon as possible while not compromising the quality of your building. Your brand new granny flat will be completed within 12 -16 weeks.

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