Home Extension Builder Chifley — From $150K Fixed Price
Fixed-price home extensions in Chifley 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 Chifley 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.
Extending Homes in Chifley
Extension in Chifley is post-war stock additions on 500–700m² blocks. Limited heritage controls. Realistic budget $250K–$650K for 70–130m² addition. Pre-construction 4–6 months.
Practical realities of extending in Chifley: Nearest rail is Light Rail Kingsford (3 km), which influences site access during construction (deliveries, cranage, skip placement). 500–700m² blocks usually have enough room for proper site set-up, but tight battle-axe lots and narrow frontages need staging plans factored into the build program. Randwick City Council processes a steady volume of residential applications — clean documentation moves fast, and Buildana lodges everything at full standard the first time. Class M (sandstone ridges) / H–E (cliff fall on coast) soil (extremely reactive clay) sets foundation cost in the $45,000–$80,000 range; budget allocation for that line item is fixed in your contract, not estimated.
Buildana manages the complete home extension process in Chifley — 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 Chifley from $150K
- Randwick City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M (sandstone ridges) / H–E (cliff fall on coast) soil — 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 (3 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Why Extend Your Home in Chifley?
Chifley is a quiet inland suburb in the southern Randwick LGA — post-war fibro and brick on 500–700m² blocks. Limited heritage stock. Sandstone soil. Affordable entry point in the Randwick LGA.
Chifley sits in the Randwick local government area with 500–700m² residential blocks and R2 Low / R3 Medium (Coogee/Maroubra/Kingsford R4 spines) zoning. Building costs are around the Sydney metro average, balancing construction value with lifestyle and growth. Transport access via Light Rail Kingsford (3 km) connects Chifley to the wider Sydney network. 1950s–1970s-era homes in Chifley often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Ground conditions (Class M (sandstone ridges) / H–E (cliff fall on coast)) across Chifley are well understood by local builders — Buildana's engineering accounts for extremely reactive soil movement.
Extension is the dominant scope across Randwick coastal heritage suburbs (Clovelly, Coogee village, South Coogee, Maroubra heritage core, Malabar, La Perouse) and Daceyville garden suburb where KDR is restricted. Federation cottage additions, inter-war heritage extensions, cliff-top heritage-grade work all common. Suspended slabs and substantial retaining on cliff-fall sites. Coastal salt-grade specs standard on coastal-facing builds. Heritage Council expects retention of stained glass, ornate plasterwork, slate roofing on protected streets. Apartment renovations the other major category along Anzac Parade UNSW corridor through Kensington/Kingsford, Coogee village, Maroubra Junction. Realistic budget $300K–$900K for thoughtful 60–130m² addition inland/mid-tier; $700K–$1.8M premium coastal heritage-grade work; $1.2M–$3M direct beachfront/clifftop.
Planning Controls — Randwick City Council
Randwick LEP 2012 & Randwick DCP 2013. R2 Low Density covers most residential streets: FSR 0.55–0.65:1, building height 9.5m, front setback 4–6m, landscaped area 35–40%. R3 Medium Density along Coogee Bay Road, Carrington Road, Belmore Road, Maroubra Road and Anzac Parade permits FSR up to 0.9:1. R4 High Density and B4 Mixed Use concentrated on the Anzac Parade UNSW corridor through Kensington and Kingsford, Randwick Junction, Coogee village and Maroubra Junction. Heritage Conservation Areas cover Daceyville (entire suburb), Coogee village, Clovelly, parts of Maroubra and South Coogee, Randwick Junction, La Perouse, Malabar and Kensington/Kingsford pockets. Tree Preservation Order LGA-wide. Sandstone-dominant soil with substantial cliff fall on the eastern coast from Clovelly through South Coogee to Malabar Headland — suspended slabs and substantial retaining standard, rock excavation $20K–$60K. Coastal salt-grade specifications mandatory across all coastal-facing builds (Clovelly, Coogee, South Coogee, Maroubra, Malabar, Little Bay, La Perouse). Aboriginal cultural heritage protocols apply on the La Perouse headland and parts of the Botany Bay foreshore. UNSW campus and Light Rail (Randwick line + Kingsford line) drive density along Anzac Parade. The new Randwick Health & Innovation Precinct (Prince of Wales Hospital, UNSW Health Translation Hub) is the LGA's signature strategic centre. Randwick Racecourse and Centennial Parklands frontage on the western edge of the LGA.
Home extension builder in Chifley — key facts
- Suburb
- Chifley, NSW 2036
- Council / LGA
- Randwick City Council (Randwick)
- Primary zoning
- R2 Low / R3 Medium (Coogee/Maroubra/Kingsford R4 spines)
- Typical lot size
- 500–700m²
- Soil class
- Class M (sandstone ridges) / H–E (cliff fall on coast)
- Median house price
- $1.8M–$2.8M
- 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
Building in Chifley — Local Context
Chifley Block Realities
Typical Chifley blocks are 500–700m² on Class M (sandstone ridges) / H–E (cliff fall on coast) ground (extremely reactive clay). For a extension, the structural envelope is more constrained than the headline lot size suggests — once you subtract setbacks, easements, landscaped area requirements, and any tree preservation, the actual buildable area is usually 35-45% of the block. We map that early in the feasibility stage so you're designing to what's actually allowed, not what looks possible from the title plan. Foundation cost band on most Chifley blocks: $45,000–$80,000.
Approval Timeline for Chifley
Realistic timeline for a extension in Chifley: 8–14 weeks for DA through Randwick City Council. Add 2–4 weeks before lodgement for documentation, BASIX certificate, geotech report, and survey if you don't already have one. Construction Certificate is issued separately before works commence.
Realistic Budget for Chifley
For a home extension in Chifley, the budget conversation starts with what you actually want versus what the site supports. Most quotes you'll get from volume builders strip out the things that matter on Class M (sandstone ridges) / H–E (cliff fall on coast) soil — engineered slab upgrade, decent waterproofing, real drainage design, BASIX-compliant glazing — and present them as variations after you sign. We don't do that. Buildana's contract is fixed-price including everything required to deliver a extension that complies with NCC 2025 on a 500–700m² block in Chifley.
Building to Suit Chifley
Chifley's R2 Low / R3 Medium (Coogee/Maroubra/Kingsford R4 spines) zoning, 500–700m² blocks, and 1950s–1970s housing stock set the design context. For a extension, the practical implications: extensions read best when the addition shares structural logic with the existing — extending the existing roof line, matching ceiling heights at the junction, using the same brick range. Buildana's design phase resolves all of this before you commit to construction pricing.
Why Some Chifley Builds Stall
Builds in Chifley stall for predictable reasons. Lodgement defects (missing BASIX, wrong drawing scale, undeclared overlays). Soil surprises on Class M (sandstone ridges) / H–E (cliff fall on coast) ground when the builder didn't commission a borehole upfront. Variation creep when the contract was light on inclusions. Trade scheduling gaps when the builder is over-committed across too many sites. Randwick City Council delays when neighbour objection triggers committee review. Buildana protects against each of these at contract stage — fully documented lodgement pack, geotech in the price, itemised inclusions instead of allowances, and a tight project-manager-to-job ratio that keeps trades moving.
Builder's Take on Chifley
BASIX re-certification on extensions catches people out. Any extension over 50m² triggers BASIX on the combined envelope. Your existing home might be well short of 7-star, so the extension has to pull the whole house closer to compliance. That can mean insulation upgrades in the existing walls and ceiling.
The cost-per-square-metre on an extension is almost always higher than new build — roughly $3,800–$5,500/m² vs $3,200–$4,500/m² for new. Reason: connecting new to old adds engineering, matching adds material cost, working around occupation adds time. Budget accordingly.
Chifley vs Nearby Suburbs
Chifley vs nearby suburbs — key metrics for extending.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| Chifley2036this suburb | $1.8M–$2.8M | 500–700m² | Class M (sandstone ridges) / H–E (cliff fall on coast) | 1950s–1970s | Light Rail Kingsford (3 km) |
| Malabar2036 | $2M–$3.8M | 400–700m² | Class M (sandstone ridges) / H–E (cliff fall on coast) | 1900s–1960s | Light Rail Kingsford (6 km) |
| Matraville2036 | $1.7M–$2.6M | 500–700m² | Class M (sandstone ridges) / H–E (cliff fall on coast) | 1950s–1970s | Light Rail Kingsford (5 km) |
| Little Bay2036 | $2M–$4M | 250–500m² | Class M (sandstone ridges) / H–E (cliff fall on coast) | 2000s+ master-planned | Light Rail Kingsford (10 km) |
Median price, soil class, and lot size shape build feasibility and final cost. Buildana assesses every site against these and other constraints during the free feasibility stage.
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Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $86,000 – $170,000 |
| Medium rear/side extension (30–60m²) | $170,000 – $300,000 |
| Large ground-floor extension (60–100m²) | $300,000 – $480,000 |
| Second-storey addition (60–120m²) | $270,000 – $520,000 |
| Wrap-around (ground + 1st floor) | $480,000+ |
| 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. Walk through your Chifley home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure. The cost estimate that follows is grounded in what we found, not a generic per-m² number. 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.
⏱The Chifley construction phase. Fixed price, programmed, supervised. Most rear extensions in Chifley qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Randwick City Council because of overshadowing and privacy assessments. We choose based on your design, not on what's easier to lodge. Extension built from new footings to completion — connecting structurally to your existing home. Class M (sandstone ridges) / H–E (cliff fall on coast) soil design managed. Temporary weatherproofing maintains liveability where possible.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. 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. Maintenance guide provided.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
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Liverpool, NSW
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Last updated: 1 April 2026
Chifley Extension — Free Consultation
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