Home Extension Builder Strathfield
Home extension specialists — additions, second storeys and structural reworks on existing homes.
Home Extension in Strathfield — what it actually takes in 2026
Extensions are the dominant scope across most of Strathfield given heritage controls. Federation mansion additions on Mansion Belt streets, Edwardian estate reconfiguration in Strathfield village core, Italianate restoration on protected streets all common. Heritage Council expects retention of stained glass, ornate plasterwork, marble fireplaces, slate roofing, sandstone walling. Tree Preservation Order strict — AS4970 root-zone protection plans routine on canopy trees. Engineered slab and footing reinforcement on Class S/H reactive clay; structural underpinning on heritage stock. Realistic budget $700K–$1.8M for premium 80–150m² heritage-grade addition on Mansion Belt; $400K–$1.0M for thoughtful 60–130m² addition on suburban-scale Strathfield South/Belfield. Pre-construction 8–12 months DA on Mansion Belt heritage; 5–8 months suburban-scale.
Why Strathfield 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 Strathfield?
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 Strathfield — frequently asked questions
Do I need DA approval for a home extension in Strathfield?
Most extensions exceeding 50m² floor area or altering envelope require DA in Strathfield. 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 Strathfield?
Second-storey additions in Strathfield 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 Strathfield
Neighbouring Sydney LGAs we build in
We work right across the Sydney basin. If your block sits on the boundary of Strathfield, 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