Home Extension Builder South Turramurra — From $150K Fixed Price
Fixed-price home extensions in South Turramurra 2074. Rear extension $150K–$300K, second storey $300K–$500K. Ku-ring-gai Council approvals managed. Free site consult.
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A home extension in South Turramurra costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Ku-ring-gai Council approvals, and construction under one fixed-price contract.
South Turramurra Home Extensions & Additions
Extensions in South Turramurra run into the Lane Cove valley soil and slope — reactive clay (H to E) under any new footings, and retaining wall requirements where the addition extends into the fall. Block sizes 800–1,500m². Browns Field south. Realistic budget $350K–$700K once foundations and retaining are properly costed. Engineered slab on the new section is non-negotiable.
Most South Turramurra blocks run 800–1,500m² on Class M–H ground. Extension feasibility depends on what's underneath the existing slab and whether the frame can carry a second-storey load — Buildana checks both before quoting, so what's in the contract is what gets built. Median price band: $2.8M–$4.2M. Nearest rail is Turramurra (2 km).
Buildana manages the complete home extension process in South Turramurra — 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 South Turramurra from $150K
- Ku-ring-gai Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M–H soil — structural engineering included
- 1920s–1960s (heavy heritage stock)-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Turramurra (2 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 South Turramurra?
South Turramurra sits in the Lane Cove River valley with steeper, more reactive blocks than its sibling suburbs. Browns Field and Browns Forest reserve frame the southern edge. Lots run 800–1,500m² with clay soil pockets (Class H to E) where the valley deepens — engineered slab and retaining design adds cost compared to ridge-top Turramurra. Cul-de-sac streets, family-oriented, no station of its own.
South Turramurra's established streetscape and median house prices of $2.8M–$4.2M reflect a premium location within Ku-ring-gai. Building costs sit above the metro average, offset by stronger capital growth and rental returns. Transport access via Turramurra (2 km) connects South Turramurra to the wider Sydney network. 1920s–1960s (heavy heritage stock)-era homes in South Turramurra often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Soil conditions in South Turramurra (Class M–H, moderately to highly reactive) are factored into every Buildana foundation design.
Home extensions across Ku-ring-gai mostly target the post-war and 1960s–1970s stock that sits between the Federation heritage homes — those mid-century houses often have small kitchens, closed-off living, and no connection to backyards that average 400m² of lawn. Rear ground-floor extensions for kitchen-living-dining and outdoor flow are the most common scope. Second-storey additions on heritage Federation homes need careful design to satisfy Council's character controls — pitched roof forms, articulated dormers, and matched eave detailing. Tree Preservation Order applies to any tree close to the work zone. Realistic budget: $250K–$650K for a 60–120m² addition on a typical Ku-ring-gai block, plus $40K–$80K of council/heritage/structural pre-construction.
Planning Controls — Ku-ring-gai Council
Ku-ring-gai LEP 2015 & Ku-ring-gai DCP. R2 Low Density: FSR 0.3:1 on lots under 1,200m² (sliding down to ~0.27:1 on larger lots), building height 9.5m, front setback 9–12m varying by streetscape, landscaped area 50%, deep soil 30%. Heritage Conservation Areas cover significant portions of Gordon, Killara, Pymble, Wahroonga, Warrawee, Roseville and Turramurra — heritage character assessment is required before any DA. Tree Preservation Order is one of Sydney's strictest: any tree over 5m high or 0.45m trunk circumference needs Council consent before removal. Bushfire planning (Planning for Bushfire Protection 2019) applies in St Ives, St Ives Chase, North Turramurra, North Wahroonga and bush-edge lots — BAL assessment is mandatory. The 2024 NSW TOD reforms permit medium density inside 400m of Roseville, Lindfield, Killara, Gordon, Pymble, Turramurra and Warrawee stations, but Council scrutiny on built form and tree retention remains heavy.
Home extension builder in South Turramurra — key facts
- Suburb
- South Turramurra, NSW 2074
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 800–1,500m²
- Soil class
- Class M–H
- Median house price
- $2.8M–$4.2M
- Home era
- 1920s–1960s (heavy heritage stock)
- 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 South Turramurra — Local Context
Ground Conditions That Affect Your Build
Class M–H is the rule across South Turramurra — moderately to highly reactive clay. For your home extension, expect engineered footings in the $24,000–$42,000 range. The variables that shift you up or down inside that band: building footprint, number of storeys, point loads (heavy stone benchtops, masonry feature walls), and whether the adjacent stormwater system needs upgrading. South Turramurra is close to Turramurra (2 km) station — site access on tighter blocks adds a logistics premium, which is why we cost cranage and material delivery before signing, not after.
Planning Controls in South Turramurra
South Turramurra is zoned R2 Low Density. Ku-ring-gai Council controls FSR, height limits (typically 8.5–9m), site coverage, landscaped area minimums, and setbacks. For a extension, the binding constraints on most 800–1,500m² blocks here are: front setback (around 4.5–6m), side setbacks (1.0–1.5m articulated), rear (3–6m depending on lot depth), and landscaped area (usually 35–40%). Buildana's design team works to those numbers from the first sketch — no late re-design when council comes back with comments.
Realistic Budget for South Turramurra
For a home extension in South Turramurra, 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–H 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 800–1,500m² block in South Turramurra.
South Turramurra Housing Stock & What That Means
Most homes in South Turramurra were built 1920s–1960s (heavy heritage stock). That puts asbestos risk firmly in play — sheeting, eaves linings, vinyl floor tiles, and pipe lagging are likely. Licensed removal adds $5,000–$25,000 to a extension where demolition is involved, and Buildana manages SafeWork NSW notifications, removal, and clearance certificates as part of the contract. Existing structures from 1920s–1960s (heavy heritage stock) usually need wiring, plumbing, and insulation upgrades to meet NCC 2025 — worth costing that into the extension scope upfront, not as a variation later.
What Recent Approvals Show
Ku-ring-gai Council's recent decisions for Extensions in South Turramurra reveal a clear pattern — applications with proper structural engineering tied to the existing footings on Class M–H soil and clean shadow analysis to neighbours' POS are progressing without RFIs. Sloppy lodgement adds 4-8 weeks of round-trip; clean lodgement doesn't.
Builder's Take on South Turramurra
Second storey on a South Turramurra home: the existing single-storey footings usually need reinforcement, which adds $15K–$40K. The roof comes off. The house is exposed for 4–8 weeks (weatherproofed nightly). Clients often underestimate the disruption — but the result is a doubling of floor area for 50% of the cost of a rebuild.
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.
South Turramurra vs Nearby Suburbs
South Turramurra vs nearby suburbs — key metrics for extending.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| South Turramurra2074this suburb | $2.8M–$4.2M | 800–1,500m² | Class M–H | 1920s–1960s (heavy heritage stock) | Turramurra (2 km) |
| Turramurra2074 | $2.8M–$4.2M | 700–1,100m² | Class M | 1920s–1960s (heavy heritage stock) | Turramurra |
| West Pymble2073 | $2.8M–$4.2M | 800–1,400m² | Class M–H | 1950s–1980s | Pymble (3 km) |
| Pymble2073 | $3.2M–$5.0M | 1,000–1,800m² | Class M | 1920s–1960s (heavy heritage stock) | Pymble |
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.
Have a question about your project?
Talk to our team — free site assessment and fixed-price quote.
Cost Guide
| Item | Estimated Range |
|---|---|
| Single-room addition (bedroom/study) | $72,000 – $170,000 |
| Kitchen/living extension | $180,000 – $420,000 |
| Master suite + ensuite addition | $160,000 – $340,000 |
| Second storey (full or partial) | $340,000 – $660,000 |
| Multi-room ground floor wrap | $420,000 – $720,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Extension feasibility comes down to two things: what the existing structure can carry, and what Ku-ring-gai 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 South Turramurra 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–H 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.
⏱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
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