Granny Flat Builder Hornsby Heights — Approval in 10 Days, Finished in 14 Weeks
Hornsby Heights 2077 secondary dwellings via the NSW Affordable Rental Housing SEPP. CDC fast-track (10–15 days), construction in 14–20 weeks. Free site check.
HIA Member
MBA NSW0476 300 300Granny Flats Designed for Hornsby Heights Blocks
A granny flat builder in Hornsby Heights works with large bushland-fringe blocks where bushfire and rock, not land size, decide the build. The 1960s to 2000s brick stock sits on 700 to 1,500m² blocks, so clearing the 450m² threshold for a 60m² secondary dwelling under the Housing SEPP is never the issue. Most of the suburb carries a BAL rating from 12.5 up to Flame Zone against Berowra Valley National Park, and the granny flat has to meet that spec too.
The RFS Bush Fire Protection Assessment is mandatory here, and the Hawkesbury Sandstone brings deep rock excavation, which on a small granny flat footprint is a proportionally large line. Both need pricing from real assessments rather than a guess.
What I check first on your Hornsby Heights block: the BAL assessment and its effect on the granny flat spec, the depth to rock, and the asset protection zone against your buildable rear yard. Those decide feasibility and price.
We build fixed-price, licence HBL 487805C. Get our granny flat feasibility before you commit.
Buildana manages the full granny flat process in Hornsby Heights — from site assessment and CDC fast-track approval through to fixed-price construction and handover. We build studio, 1-bedroom, and 2-bedroom designs up to the NSW maximum of 60m².
Read our Complete Granny Flat Guide or explore granny flat builds across Sydney.
- Granny flats in Hornsby Heights from $150K
- CDC fast-track approval (10–15 business days)
- 700–1,500m² blocks — most qualify for 60m² granny flat
- Hornsby Heights zoned R2 Low Density predominant / R3 Medium Density on Hornsby/Asquith/Waitara/Pennant Hills station precincts / R4 (Hornsby CBD high-rise zone) / RU2 Rural Landscape (Galston/Berrilee/Arcadia/Forest Glen/Glenorie acreage belt)
- Fixed-price contract — design to handover
- Hawkesbury Sandstone bedrock — engineered slab included
- Rental yield $520–$720/week (Hornsby Hospital + Hornsby TAFE + Macquarie University proximity) in Hornsby Heights
- Free site assessment — near Hornsby (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Bushfire spec applies to the granny flat
People assume a granny flat escapes the bushfire rules that hit the main house. In Hornsby Heights it does not. Most lots carry a BAL rating from 12.5 to Flame Zone against Berowra Valley National Park, and a 60m² secondary dwelling has to meet the same construction standard: toughened glazing, ember screening and non-combustible cladding scaled to the rating. On a small footprint that spec is a real share of the cost.
The 700 to 1,500m² blocks clear the 450m² Housing SEPP threshold many times over, so land size is never the issue. The BAL and the asset protection zone are what shape the build, and I map them before design.
Deep rock on a small footprint
The Hornsby Heights sandstone brings deep rock excavation, and on a 60m² granny flat that rock is proportionally large because the dwelling itself is small. I would rather have it priced from a real geotech than found by the excavator, because it can make or break the yield on a secondary dwelling here. Get the BAL and the rock assessed early and the build becomes a known quantity.
Granny flat builder in Hornsby Heights — key facts
- Suburb
- Hornsby Heights, NSW 2077
- Council / LGA
- Hornsby Shire Council (Hornsby Shire)
- Primary zoning
- R2 Low Density predominant
- Typical lot size
- 700–1,500m²
- Soil class
- Hawkesbury Sandstone bedrock
- Median house price
- $1.8M–$2.6M Hornsby/Asquith/Mount Colah; $2.4M–$3.6M Cherrybrook/Beecroft/Pennant Hills; $3.0M–$8.0M+ Galston/Arcadia acreage
- Home era
- 1900s–1940s Federation heritage
- Typical price range
- $150,000 – $300,000+
- Typical timeline
- 4–6 months design to handover
- Approval pathway
- CDC via NSW Affordable Rental Housing SEPP (10–15 days)
Want a real number for YOUR block — not a generic estimate?
Free site assessment, fixed-price contract, line-itemised quote within 48 hours. No high-pressure sales — just a real builder talking real numbers.
Quality Promise
Hornsby Heights granny flat construction done to a schedule. CDC lodged, slab poured, handover complete — on one fixed-price contract.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Site visit to your Hornsby Heights block to check feasibility — lot dimensions, sewer and stormwater locations, driveway access, and Hornsby Shire Council's setback and landscape requirements. Written feasibility report within 3 business days. Design pulls from a library of plans we've refined over years of Hornsby Heights-area builds, then adapts to your specific block constraints. Faster than starting from scratch, better than buying a stock plan that doesn't suit the site.
⏱The Hornsby Heights construction phase. Fixed price, programmed, supervised. Most Hornsby Heights granny flats qualify for CDC — faster and simpler than DA. Buildana prepares all documentation, lodges with the certifier, and obtains the Construction Certificate. Typical turnaround: 2–3 weeks. Construction in your back yard means coordinating site access, material delivery, and trade movement around the existing house. Buildana plans the build to keep main-house disruption to a few hours per week, not constant noise and dust.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Final inspection, Occupation Certificate, keys, and maintenance guide. Ready for tenants or family. Rental potential: $520–$720/week (Hornsby Hospital + Hornsby TAFE + Macquarie University proximity) per week.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
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Still got questions? Talk to Oliver directly.
30-min free call — bring your block, your brief, your budget. We'll map out feasibility, timeline, and realistic cost. No sales pitch.
Frequently Asked Questions
Buildana built our granny flat in just 12 weeks. Fast approvals, great communication, and a beautiful final product. Highly recommend.
Fatima Al-Rashid
Liverpool, NSW
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Last updated: 1 July 2025
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Hornsby Heights 2077. Hornsby Shire Council regulations and local controls are covered on each page.