Home Extension Sandringham — Design, Approval, Structural, Build
Full-service extensions in Sandringham 2219: structural survey of existing 1930s–1970s home, design, Bayside Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Sandringham costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Bayside Council approvals, and construction under one fixed-price contract.
Sandringham Home Extensions — Fixed Price
A home extension in Sandringham grows the bay's quiet corner — inter-war and post-war homes on generous 500 to 900m² blocks, where the wing faces the water in salt-grade materials and the leafy enclave stays itself.
The sands are read before excavation, the era fabric gets licensed handling, and the upmarket standard shapes the finishes.
At the $2.2M to $4.0M median, the wing beats trading out of the enclave.
We build these fixed-price, licence HBL 487805C. Ask us to measure what your block can hold.
Buildana manages the complete home extension process in Sandringham — from design consultation and structural engineering through to DA or CDC approval, and fixed-price construction to handover. Extend your home without the stress.
Read our Home Extension Cost Guide 2026 or explore extension approval pathways in NSW.
- Home extensions in Sandringham from $150K
- Bayside Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1930s–1970s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Bus to Kogarah (T4, 5 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The quiet corner grows carefully
Sandringham's leafy beachside standing rewards wings done to its standard — living turned toward the bay, generous blocks used well, salt-grade materials surviving the foreshore air.
The enclave's character holds every metre added.
Sands, salt and fabric
The sands are read before excavation, salt-grade specs are standard, and the era fabric gets licensed handling.
The sands read, the salt-grade spec and the strip-out are all costed up front.
Home extension builder in Sandringham — key facts
- Suburb
- Sandringham, NSW 2219
- Council / LGA
- Bayside Council (Bayside)
- Primary zoning
- R2 Low
- Typical lot size
- 500–900m²
- Soil class
- M
- Median house price
- $2.2M–$4.0M (beachfront $3M–$6M+)
- Home era
- 1930s–1970s
- Typical price range
- $150,000 – $600,000+
- Typical timeline
- 6–12 months design to handover
- Approval pathway
- CDC for most rear extensions, DA for second-storey
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.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $95,000 – $190,000 |
| Medium rear/side extension (30–60m²) | $190,000 – $340,000 |
| Large ground-floor extension (60–100m²) | $340,000 – $530,000 |
| Second-storey addition (60–120m²) | $290,000 – $580,000 |
| Wrap-around (ground + 1st floor) | $530,000+ |
| Structural engineering & tie-in | Included |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Extension feasibility comes down to two things: what the existing structure can carry, and what Bayside Council will let you build. We assess both at the consultation — no point designing for a second storey if the slab can't take the load. Extension designed to integrate with your existing Sandringham home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱The Sandringham construction phase. Fixed price, programmed, supervised. All approval documentation prepared: structural drawings, BASIX, shadow analysis, stormwater, and statement of environmental effects (if DA). Lodged and managed through to Construction Certificate. Extension construction takes 3–6 months on average. Footings excavated and poured to match existing depth on Class M soil, frame stand, roof tie-in (most weather-critical phase), lock-up, then internal fit-out at the same standard as the existing house.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Defect-free inspection, OC issued, 6-year warranty on all new work. Junction between old and new sections waterproofed and warranted. Maintenance guide covers care of new and existing areas.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
Use our free calculator to get an instant cost estimate for your project
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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Headquartered in Western Sydney's Fairfield. Active across all 28 metropolitan Sydney LGAs — from Penrith to the Eastern Suburbs, the Hills to the Sutherland Shire.
Last updated: 1 April 2026
Extend Your Home in Sandringham
Free design consultation for Sandringham 2219. We'll assess your home, design the extension, and provide a fixed-price quote.
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Other Buildana services in Sandringham
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Sandringham 2219. Bayside Council regulations and local controls are covered on each page.