Granny Flat Builders Hornsby

Hornsby and the wider Upper North Shore offer some of the most attractive land in Sydney for a granny flat, with large, leafy blocks and consistently high property values. That combination makes a well-built second dwelling a genuinely valuable addition, whether you want a refined space for family or a premium rental. The trade-off is that the area’s sloping terrain and bushland settings ask more of a builder. As experienced granny flat builders in Hornsby, we handle exactly that kind of site with confidence.

A granny flat in Hornsby adds usable space and lasting value to a property that is already worth protecting. We design each build to suit the character of the Upper North Shore, manage the approvals, and deliver the quality this market expects. From the first site visit to the final handover, you work with one accountable team.

Hornsby Shire Council and Complying Development: What You Need to Know

A granny flat in Hornsby usually follows one of two approval paths. A Complying Development Certificate is the faster route for blocks that meet the standard rules under the Housing SEPP. A Development Application through Hornsby Shire Council applies where a site sits outside those rules, which is more common here given the area’s slope, bushfire zones and vegetation.

As a guide, complying development needs at least 450 square metres of land, a 12 metre frontage, a 3 metre rear setback and 0.9 metre side setbacks. Because Upper North Shore blocks so often carry additional constraints, we assess each site carefully, advise on the right pathway, and manage the full approval for you.

Fast-track

CDC — Complying Development Certificate

The quicker approval path for blocks that meet the standard rules, backed by our 4-week approval guarantee.

Via council

DA — Development Application

For sites outside the standard rules or in special planning zones. We prepare, lodge and manage it through Hornsby Shire Council for you.

Complying development at a glance

450m²Minimum land size

12mMinimum street frontage

3mRear boundary setback

0.9mSide boundary setbacks

We check every one of these factors during your free site inspection — including slope, drainage and existing services.

Designs That Suit Upper North Shore Blocks

The Upper North Shore rarely offers a flat, featureless block, and that is where our design experience earns its keep. We plan each granny flat around the slope, the trees and any bushfire overlay on your land, positioning the dwelling to sit naturally and capture the outlook. Our full range of granny flat designs gives you a strong starting point, and we tailor the layout to your site.

For homeowners who want to make the most of a high-value property, our luxury granny flat designs lift the finish further, with premium materials and considered detailing that complement an established Upper North Shore home. Standard inclusions across every build cover a floor to ceiling tiled bathroom, soft closing cabinets, a separate electricity meter and quality appliances.

One Bedroom Flats

Great for people on a small budget and with limited space. It can easily accommodate one or two adults.

Two Bedroom Flats

Ideal for small families for two to four people. This can be rented out because they're relatively spacious.

Three Bedroom Flats

This design is for people who want larger spaces that can accommodate 3 to 6 people. You need room on your property to build such a flat.

Custom Flats

We understand that different clients have different requirements so we offer custom design options as well. You can meet with our draftsmen and plan a design that suits your requirements well.

If you have questions and need to know more about our designs, you can visit our FAQ page or give us a call. Our experts are always willing to answer your questions and help in any way they can.

Process for granny flats in Hornsby

Adding a granny flat in Hornsby can be pricy so its important to work close with a company that will deliver the quality you require. At 5 Star we have high-quality standards and have tried and tested many materials on our projects to get to where we are.

Phase 1

is about qualifying your land in Hornsby to ensure it is eligible for a granny flat build.

Phase 2

one of our expert team members will come out to the property for a free site visit and consultation. We will discuss your desired granny flat construction in Hornsby

Phase 3

will be after the acceptance of the quote which will move you into the floor plans and survey plan.

Phase 4

you can either choose from the state-of-the-art designs that we offer all our clients or we can work together with a draftsman to develop a custom solution to suit your needs. Once that is complete, we will handle the certified approval for your granny flat in Hornsby

Phase 5

we will begin construction with a team of qualified subcontractors, all managed by our experienced site supervisors. This approach guarantees high-quality workmanship and ensures that every phase of the construction is completed promptly and according to schedule.

Our goal is to always deliver seamless service and outstanding results for your granny flat Builders Hornsby

Why Hornsby Homeowners Choose 5 Star Granny Flats

Hornsby homeowners choose us because we build to a premium standard and back it properly. With more than 15 years of experience, hundreds of 5-star reviews and recognition as an award-winning builder, we bring the craftsmanship the Upper North Shore calls for. Every build carries a 6-year structural warranty and our 4-week approval guarantee.

We are a family-owned Australian business, and we give each project the care and attention that reputation depends on. In a market where quality and finish matter, our track record speaks for itself, and much of our work here comes through referral.

We also make the process easy on a part of Sydney where building is rarely straightforward. Rather than leaving you to coordinate designers, certifiers and trades, we run the whole project as one team. That single point of accountability is worth a great deal on an Upper North Shore block, where slope, trees and bushfire requirements can catch out a builder who has not worked the area before.

Quality

We always focus on quality, regardless of the budget because we want to build sturdy and long-lasting flats. We use the best possible materials and double-check everything to ensure you don't face any problems down the line.
Pricing

Our billing is honest and straightforward so you don't have to worry about any hidden costs. Our rates are very reasonable and we're one of the most affordable granny flat builders in Hornsby.
Unique Designs

Our designers are well-versed in all modern design concepts and can create a space that suits your preferences. If you want an open, contemporary design, we can create such a space for you. If you prefer the English-cottage look, just let us know.

Granny Flat Costs in Hornsby

The cost of a granny flat in Hornsby reflects your design, your site and your finishes. Sloping blocks, tree protection and bushfire requirements can all influence the figure, which is exactly why we quote after inspecting your land rather than before. You receive a clear, itemised price with no hidden extras. Ask us how much does a granny flat cost for your specific block, and we will give you honest numbers you can plan around.

On a high-value Upper North Shore property, it also helps to think of a granny flat as an improvement rather than simply a cost. A quality second dwelling adds usable space and broadens the appeal of your home to future buyers, on top of any rental income it earns. We are happy to talk through how the numbers stack up for your particular block so you can decide with confidence.

Suburbs We Build In

We build granny flats across Hornsby and the Upper North Shore, including Hornsby, Thornleigh, Pennant Hills, Cherrybrook, Beecroft, Waitara and Asquith. Wherever your property sits, our team can assess the block, work with its slope and setting, and design a granny flat that suits it.

Got Questions?

Frequently Asked Questions

Everything you need to know about granny flats in Sydney. Can’t find your answer? Call us on 1300 843 921

Get a Free Quote

Can you build on a sloping Hornsby block?

Yes. Sloping and complex sites are common across the Upper North Shore, and we have years of experience designing and building on them. We assess the slope, drainage and access during your free site inspection.

What about bushfire zones?

Many Upper North Shore blocks carry a bushfire overlay. We design to the relevant requirements and factor them into your approval and build, so the process stays smooth.

What is the difference between CDC and DA in Hornsby?

A Complying Development Certificate is faster and suits blocks that meet the standard rules, while a Development Application through Hornsby Shire Council applies to sites with slope, bushfire or vegetation constraints. We advise which fits your property.

Can I earn rental income in Hornsby?

Yes. The Upper North Shore’s strong demographic and limited rental supply support solid returns for a well-finished granny flat.

Get a Free Quote

Ready to build?

Book your free site inspection or call our team on 1300 843 921.

Book your free site inspection ☎ 1300 843 921

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