Home Extension Builder St Ives — Approved in 60 Days
St Ives 2075 extensions with tight approval timelines. CDC where eligible (~15 days), DA via Ku-ring-gai Council in 40–60 days. Construction 12–24 weeks depending on scope.
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MBA NSW0476 300 300Quick Answer
A home extension in St Ives 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.
St Ives Home Extensions — Fixed Price
Extensions in St Ives are tree-controlled — every footprint negotiates the protected canopy, and the rear extension that looks easy on a plan often runs into a 50-year-old gum that can't be touched. Block sizes 1,000–2,000m². Bushfire BAL ratings on the east side add construction detailing for new built form. Realistic budget $350K–$700K depending on BAL rating and tree work.
For a extension in St Ives, the economics are the framing question. Median price $2.6M–$3.8M; build cost on 1,000–2,000m² blocks scales by site conditions and specification. Class M ground (moderately reactive) keeps foundations honest — $15,000–$32,000 band — and blowouts on that line are the single most common reason fixed-price contracts elsewhere don't stay fixed. Buildana itemises the slab, structural engineering, and geotech work upfront so you see the actual cost in the contract. R2 Low Density zoning across St Ives keeps the suburb residential, which protects long-term value.
Buildana manages the complete home extension process in St Ives — 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 St Ives from $150K
- Ku-ring-gai Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M soil — structural engineering included
- 1960s–1980s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Pymble (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 St Ives?
St Ives is the bushland half of Ku-ring-gai — large 1,000–2,000m² blocks, tree preservation orders on virtually every lot, and a village centre at Mona Vale Road. No train, bus only, which keeps prices a touch below the rail-line suburbs but the schools and amenities are equal. Many homes from the 1960s–1980s are now ready for replacement; every DA needs an arborist report. Eastern edge runs onto Northern Beaches LGA at Belrose.
St Ives's established streetscape and median house prices of $2.6M–$3.8M 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 Pymble (3 km) connects St Ives to the wider Sydney network. 1960s–1980s-era homes in St Ives often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Soil conditions in St Ives (Class M, moderately 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 St Ives — key facts
- Suburb
- St Ives, NSW 2075
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 1,000–2,000m²
- Soil class
- Class M
- Median house price
- $2.6M–$3.8M
- Home era
- 1960s–1980s
- 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 St Ives — Local Context
Ground Conditions That Affect Your Build
Class M is the rule across St Ives — moderately reactive. For your home extension, expect engineered footings in the $15,000–$32,000 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. St Ives is close to Pymble (3 km) station — site access on tighter blocks adds a logistics premium, which is why we cost cranage and material delivery before signing, not after.
Ku-ring-gai Planning Context
Ku-ring-gai has its own LEP and DCP layered over State planning controls. For extending in St Ives, the practical impact: Ku-ring-gai Council's DCP sets local rules for streetscape character, materials palette in some precincts, vehicle crossover widths, and tree retention. R2 Low Density zoning on most St Ives blocks permits single dwellings, alterations, and additions. Buildana checks every overlay (heritage, bushfire, flood, acid sulfate soil, biodiversity) before quoting.
Realistic Budget for St Ives
For a home extension in St Ives, 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 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 1,000–2,000m² block in St Ives.
Designing for the St Ives Streetscape
St Ives's housing stock is predominantly from the 1960s–1980s. Pymble (3 km) from the nearest station. The local anchor is St Ives Shopping Village & St Ives Showground. For a home extension, the streetscape question matters more than most builders admit — a brand-new double-storey on a street of single-storey 1960s–1980s weatherboards will draw council attention on bulk and scale, even if technically compliant. Buildana designs the front elevation to read appropriately for the street while modernising the floor plan and structure behind it. Materials palette, roof pitch, fenestration rhythm — all chosen to settle into the existing rhythm rather than fight it.
Realistic St Ives Timeline
End-to-end timeline for a home extension in St Ives, lodgement-realistic: 8-14 weeks for DA, depending on neighbour notification and any RFI rounds. Add 2-3 weeks for documentation pack assembly before lodgement (BASIX, geotech for Class M, contour survey, hydraulic). Add 1 week for Construction Certificate post-approval. Construction runs 3-6 months depending on scope. Buildana provides a dated programme in every contract, not a vague "12-18 months" range.
Builder's Take on St Ives
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.
Existing-structure assessment is the non-negotiable first step. St Ives 1960s–1980s homes often have undersized footings or termite-damaged wall plates that won't carry a second storey. We check with drilled inspections before quoting — no point designing a dream that's not structurally viable.
St Ives vs Nearby Suburbs
St Ives vs nearby suburbs — key metrics for extending.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| St Ives2075this suburb | $2.6M–$3.8M | 1,000–2,000m² | Class M | 1960s–1980s | Pymble (3 km) |
| St Ives Chase2075 | $2.4M–$3.4M | 1,200–3,000m² | Class M | 1970s–1990s | Mount Colah (4 km) |
| Pymble2073 | $3.2M–$5.0M | 1,000–1,800m² | Class M | 1920s–1960s (heavy heritage stock) | Pymble |
| Wahroonga2076 | $3.0M–$4.6M | 800–1,500m² | Class M | 1920s–1960s (heavy heritage stock) | Wahroonga |
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.
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 St Ives 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 St Ives 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) | $75,000 – $180,000 |
| Kitchen/living extension | $190,000 – $440,000 |
| Master suite + ensuite addition | $160,000 – $350,000 |
| Second storey (full or partial) | $350,000 – $690,000 |
| Multi-room ground floor wrap | $440,000 – $750,000 |
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
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Liverpool, NSW
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Last updated: 1 April 2026
Extend, Don't Move — St Ives
Free design consultation for St Ives 2075. We'll assess your home, design the extension, and provide a fixed-price quote.
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