Home Extension Builder Sans Souci — From $150K Fixed Price
Fixed-price home extensions in Sans Souci 2219. Rear extension $150K–$300K, second storey $300K–$500K. Bayside Council approvals managed. Free site consult.
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MBA NSW0476 300 300Quick Answer
A home extension in Sans Souci 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.
Sans Souci Home Extensions — Fixed Price
A home extension in Sans Souci is decided by which water your block faces. On the peninsula almost every lot has a story — river on one side, Botany Bay on the other — and the wing that pays turns the living toward whichever edge you have, in salt-grade materials that hold up near both.
The Rocky Point Road R3 gets the zoning check, the sands-to-shale interface is read before any structural work, and the older fabric gets licensed handling.
At a $2.0M to $4.0M median, on 500 to 900m² blocks, the water-facing wing is the natural investment.
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 Sans Souci — 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 Sans Souci 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
Turn toward your water
The peninsula gives every block an outlook worth building for — living opened toward the river or the bay, generous glazing, the premium position earned rather than assumed.
The 500 to 900m² blocks leave the design real room to do it well.
Interface and fabric handled
Where the ground shifts from reclaimed sand to shale, that interface is read before structural work rather than discovered in the footings.
Salt-grade fixings are standard near both edges, and the older fabric comes out under licence — all costed up front.
Home extension builder in Sans Souci — key facts
- Suburb
- Sans Souci, NSW 2219
- Council / LGA
- Bayside Council (Bayside)
- Primary zoning
- R2 Low
- Typical lot size
- 500–900m²
- Soil class
- M
- Median house price
- $2.0M–$4.0M (waterfront $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.
How It Works
From First Call to Final Key
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 Sans Souci home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱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.
⏱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.
⏱Quality Promise
Buildana's Sans Souci home extension process: assess the existing structure, design the addition, approve, build. Fixed price throughout.
Cost Guide
| Item | Estimated Range |
|---|---|
| Single-room addition (bedroom/study) | $63,000 – $150,000 |
| Kitchen/living extension | $160,000 – $370,000 |
| Master suite + ensuite addition | $140,000 – $290,000 |
| Second storey (full or partial) | $290,000 – $580,000 |
| Multi-room ground floor wrap | $370,000 – $630,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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
We Build Across Sydney
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, Don't Move — Sans Souci
Free design consultation for Sans Souci 2219. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Sans Souci
Other Buildana services in Sans Souci
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Sans Souci 2219. Bayside Council regulations and local controls are covered on each page.