Home Extension Builder Phillip Bay — From $150K Fixed Price
Fixed-price home extensions in Phillip Bay 2036. Rear extension $150K–$300K, second storey $300K–$500K. Randwick City Council approvals managed. Free site consult.
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A home extension in Phillip Bay costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Randwick City Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Phillip Bay
A home extension in Phillip Bay is about growing without giving up the quiet. It is a small, settled bay-side pocket of post-war homes on 500 to 700m² blocks near the water, the kind of low-key spot people hold onto — so a wing that adds the bedrooms, living and alfresco while the character stays intact tends to beat trading out of it.
The read on the house leads: sound brick takes the wing, tired fibro gets a rebuild comparison, and the post-war fabric gets a licensed asbestos strip-out where the work opens it up. Close to the water, salt-aware materials handle the bay air as standard.
At a $1.7M to $2.6M median, the sums for staying are clear — the settled bay-side position is the asset, and the block depth here lets you build the space the house was missing.
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 Phillip Bay — 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 Phillip Bay from $150K
- Randwick City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1950s–1970s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Light Rail Kingsford (8 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The quiet pocket grows
Phillip Bay's settled bay-side character is worth keeping, and a wing lets the household grow without leaving it — bedrooms, living and alfresco added on blocks with real depth.
If the original cannot carry the work, I put the rebuild comparison in front of you first.
Era and air handled
Where the work opens the post-war fabric, asbestos is stripped out under licence.
Salt-aware materials handle the bay exposure, and all of it is priced into the job from the outset.
Home extension builder in Phillip Bay — key facts
- Suburb
- Phillip Bay, NSW 2036
- Council / LGA
- Randwick City Council (Randwick)
- Primary zoning
- R2 Low
- Typical lot size
- 500–700m²
- Soil class
- M
- Median house price
- $1.7M–$2.6M
- Home era
- 1950s–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 |
|---|---|
| Adding a master suite (1950s–1970s Phillip Bay home) | $120,000 – $270,000 |
| Kitchen/living open-out to backyard | $140,000 – $330,000 |
| Second storey for teenagers/office | $270,000 – $520,000 |
| Extension + bathroom (growing family) | $190,000 – $380,000 |
| Full rear + roof tie-in (entertainer's zone) | $330,000 – $570,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Walk through your Phillip Bay home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure.
⏱Our designer works with your existing home's layout — connecting new living areas to existing rooms, matching materials and roof pitch, and maximising natural light. You approve floor plans and 3D renders before we proceed.
⏱Most rear extensions in Phillip Bay qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Randwick City Council because of overshadowing and privacy assessments.
⏱Extension built from new footings to completion — connecting structurally to your existing home. Class M soil design managed.
⏱Walk through the completed extension, confirm finishes, collect your OC. Six-year structural warranty covers all new work including the junction with your existing home.
⏱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.
Start a Phillip Bay Home Extension
Free design consultation for Phillip Bay 2036. We'll assess your home, design the extension, and provide a fixed-price quote.
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Other Buildana services in Phillip Bay
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Phillip Bay 2036. Randwick City Council regulations and local controls are covered on each page.