Home Extension Builder Hornsby
Home extension specialists — additions, second storeys and structural reworks on existing homes.
Home Extension in Hornsby — what it actually takes in 2026
Extensions in Hornsby suit the Shire's mixed housing stock — Federation cottages and inter-war heritage in Beecroft, Cheltenham, Wahroonga-fringe HCAs; post-war and 1970s–1990s in Hornsby, Asquith, Mount Colah, Berowra, Pennant Hills; premium contemporary on Cherrybrook estate-scale lots; homestead-grade work on Galston/Glenorie/Arcadia RU2 acreage. Hawkesbury Sandstone rock excavation $20K–$60K on second-storey/footing-strengthening work. BAL-rated specs on bushland-fringe extensions exceeding 50% original floor area — BAL-29 minimum on most acreage; sprinklered eaves and non-combustible cladding upgrades on BAL-FZ. Heritage Council expects retention on Beecroft, Cheltenham, Wahroonga-fringe HCA stock. RU2 acreage extensions run premium homestead-grade work with BPA, AWTS reconfiguration. Realistic budget $300K–$700K for 60–130m² inland suburban addition; $500K–$1.4M on premium Cherrybrook/Beecroft/Cheltenham; $400K–$1.2M on RU2 acreage homestead extension.
Why Hornsby owners choose Buildana
- Fixed-price contracts referencing the Rawlinsons Australian Construction Handbook 2026 (Sydney column) — no estimate-only quotes that climb mid-build.
- In-house design and approvals coordination — DA, CDC, heritage, bushfire BPA, Coastal Management referrals all handled.
- Site investigation at proposal stage — soil, slope, sandstone, BAL, heritage and tree-protection assessment so the contract sum holds.
- Asbestos assessment and SafeWork NSW–compliant removal included on every pre-1990 stock project as standard.
- Owner-led project management — Oliver Alameri (NSW Builder Licence) signs every contract and runs every job.
Ready to talk home extension in Hornsby?
Book a free site assessment with Oliver Alameri. We'll cover soil, slope, council overlays, realistic 2026 costs and the planning pathway for your block.
Home Extension Hornsby — frequently asked questions
Do I need DA approval for a home extension in Hornsby?
Most extensions exceeding 50m² floor area or altering envelope require DA in Hornsby. Smaller compliant additions may use CDC fast-track. Heritage Conservation Areas require DA regardless of size. Buildana assesses your scope at proposal stage and provides the planning pathway in writing.
What does a second-storey addition cost in Hornsby?
Second-storey additions in Hornsby typically run $300K–$1.4M depending on footprint, structural reinforcement to existing footings, heritage overlay, and finish specification. Buildana provides fixed-price contracts after structural assessment.
Can I stay in the home during construction?
Most ground-floor rear extensions can be staged so you remain in the existing home during major works. Second-storey additions usually require temporary relocation for 4–8 weeks during structural and roofing works. Buildana confirms the staging plan at contract.
Other services across Hornsby
Neighbouring Sydney LGAs we build in
We work right across the Sydney basin. If your block sits on the boundary of Hornsby, or you're comparing options in a neighbouring council area, here are the closest LGAs we cover with the same depth of local knowledge.
We build across every Sydney LGA
Buildana works across all 28 Sydney metropolitan LGAs. Pick the council area your block sits in for a deep-dive on local soil, heritage controls, DCP rules, and realistic cost ranges.
Western Sydney
South-West Sydney
Inner West & River
North Shore & Beaches
Eastern Suburbs