We’re the Granny Flat Builders in Perth Who Will Customise to Your Needs.

Sertorio Homes offers an affordable way to build one, two or three bedroom granny flats or detached homes. We use 40 years of experience, a trusted network of tradesmen and the latest in 3D-imaging technology to help you take advantage of this home improvement option.

Sertorio Homes will provide floor plans, including semi-ensuite, kitchen, living and meal areas. We also include built-in robes, built-in laundry behind doors, as well as porch and alfresco areas. All of our granny flat new builds, extensions and renovations can be customised to suit your block size and shape and can be built using between 50m2 and 70m2 floor space, subject to planning approval.

It all starts with our free no-obligation consultation. When you meet with one of our experienced building representatives, you’ll have the opportunity to customise colour and material selections and specify construction with double brick or thermal walls. We’ll also help you to understand the costs involved with building a granny flat, so you have peace of mind from the outset.

Find Out More About Our Granny Flat Extension & Renovation Capbilities in Perth

If you’re looking for a granny flat extension or renovation in Perth, trust the company with more than 40 years of experience. Get in touch with the Sertorio Homes team on 08 9244 1993 for a no-obligation consultation today.


By contacting the Sertorio Home’s office by email or phone, a consultant will contact you to arrange a FREE, no obligation visit to your home.
Leave that to us. We will organise approvals with the council and Water Corporation. We will also organise the survey and engineering details.

As you can appreciate, every council has differing needs and procedures for building. Some councils are also inundated with approvals, although we work closely with councils, there may be an occasional delay with approvals. If you feel that the approval process is unusually long, we recommend that you contact the council direct.

It is advisable to contact your home insurance company to advise them of the renovation. They can advise you on your individual policy requirements.

Each renovation is unique. A time frame will be devised based on your current home and proposed renovation. You will be advised prior to signing the contract the allowable working days to complete works.

This is a personal choice. You should speak with your consultant and site manager before making your decision.

Where possible, sub-contractors to Sertorio Homes will keep mess to a minimum. To ensure you end up with the best possible renovation, it may be necessary to carry out demolition. You will need to cover furnishings and it may become unpleasant for a short period of time. Each renovation is unique and it would be best to speak with your Site Manager to determine your individual needs.

No. Sertorio Homes have qualified designers who will draw up your design plans in-house. Sertorio Homes do not use other architect designs, as we will draw to specification.

Yes you can. Any changes prior to the contract being signed are made in-house at no extra charge. Any changes after contract signed may result in additional costs onto the contract.

No. Any additional tradespeople not directly working with Sertorio Homes will not be covered by insurance. Any damage that they may cause on the renovation will also not be covered by insurance. Speak with your Site Manager to devise the best course of action prior to employing additional tradespeople.

Yes you can. If you decide to provide your own products, please advise your Consultant prior to materials being purchased. If in doubt, speak with your Consultant. Any changes can affect both the price and scheduling of your job.

Practical completion means the renovation is complete, but does not mean it is perfect. In other words, you can live in the house. At time of handover, a Practical Completion inspection will be made by the Sertorio Homes director, and any defects will be noted. These will be rectified within a reasonable time.

Sertorio Homes only carries out renovations in the immediate Perth metropolitan area. Contact our office to confirm if we renovate in your area.

What sets us apart

Our slew of awards, satisfied client testimonials and long-standing relationships with our network of tradesmen speak to how well we’ve delivered on our aim — to be Perth’s premier home improvements company.

You’re always first

With Sertorio Homes, your imagination leads the way. We turn your vision into a reality that will exceed your expectations and become a home to cherish for years to come.

Quality. Always.

Sertorio Home believes in the traditional values of care and craftsmanship. We combine this ethos with modern technology to deliver only the best in custom-designed homes.


With Sertorio Homes and our team of trusted experts, you know what you’re getting. We start by offering a no-obligation consultation, and a fixed-price contract that has a 3D walkthrough of your designs thrown in. With us, you’ll see your home realised before it’s built.

Know your renovation

Renovating means trusting your contractors to treat your home with the same care you do. We share our favourite projects so you know what to look forward to with Sertorio Homes.

Renovate or move?

Wondering which option leaves you with the dream home that suits your lifestyle? Take the quiz that helps you weight up your options based on your needs.

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