Licensed Home Extension Builder Roseville Chase
NSW licensed extension specialist. Roseville Chase 2069 extensions on 1920s–1960s (heavy heritage stock)-era homes require structural sign-off, Class M footings, and matched connection — we engineer and document properly.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Roseville Chase 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.
Roseville Chase Home Extensions & Additions
Extensions in Roseville Chase run waterfront engineering — many lots have severe fall to Middle Harbour and any addition extending into the slope needs suspended slab, retaining, and sometimes piered footings. Castle Cove/Castlecrag boundary into Willoughby south. Lots 700–1,400m². Realistic budget $450K–$900K depending on slope and view considerations. Premium pricing reflects the location and the engineering complexity.
Roseville Chase's housing stock is mostly from the 1920s–1960s (heavy heritage stock), which is the era where structural bones either hold up or don't — and we see plenty of both across the suburb. For extending here, that history matters: asbestos survey before any demolition is non-negotiable, and licensed removal lands somewhere between $5,000 and $25,000 depending on what's actually there. Median price $3.0M–$5.5M on typical 700–1,400m² blocks. Class M ground, foundation cost band $15,000–$32,000.
Buildana manages the complete home extension process in Roseville Chase — 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 Roseville Chase from $150K
- Ku-ring-gai Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M 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 Roseville (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 Roseville Chase?
Roseville Chase sits on Middle Harbour — waterfront and water-view blocks running 700–1,400m². Smaller suburb than its train-line cousin Roseville. Premium harbour setting drives prices well above Ku-ring-gai average. Borders Willoughby LGA on the southern edge at Castle Cove and Castlecrag. Soil M with sandstone outcrops; some lots have significant fall to the water requiring suspended slabs and substantial retaining. Heritage controls apply on the older inland streets.
Roseville Chase's established streetscape and median house prices of $3.0M–$5.5M 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 Roseville (2 km) connects Roseville Chase to the wider Sydney network. 1920s–1960s (heavy heritage stock)-era homes in Roseville Chase often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Soil conditions in Roseville Chase (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 Roseville Chase — key facts
- Suburb
- Roseville Chase, NSW 2069
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 700–1,400m²
- Soil class
- Class M
- Median house price
- $3.0M–$5.5M
- 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 Roseville Chase — Local Context
Site & Ground Conditions in Roseville Chase
Roseville Chase sits on Class M soil — moderately reactive. For a home extension, that keeps foundation work in the standard cost band, and pushes engineered footings into the $15,000–$32,000 range on most 700–1,400m² blocks here. Geotechnical testing isn't optional — every Buildana extension in Roseville Chase starts with a borehole report so the slab and footings are sized to your actual block, not a generic spec. It's a cheap step that prevents expensive surprises during excavation. Drainage design matters too — overland flow paths on Roseville Chase's topography can collect water against rear setbacks if the contour survey is sloppy.
Ku-ring-gai Planning Context
Ku-ring-gai has its own LEP and DCP layered over State planning controls. For extending in Roseville Chase, 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 Roseville Chase blocks permits single dwellings, alterations, and additions. Buildana checks every overlay (heritage, bushfire, flood, acid sulfate soil, biodiversity) before quoting.
What a Extension Costs in Roseville Chase
Roseville Chase's median house price sits at $3.0M–$5.5M. That's the number that decides whether a home extension stacks up financially. If you're spending more than 50% of $3.0M–$5.5M on a extension, the economics tilt toward knockdown rebuild instead. Worth running the numbers properly before locking in scope. Buildana provides itemised quotes — no provisional sums, no allowances, no "as per engineering" line items.
Roseville Chase Housing Stock & What That Means
Most homes in Roseville Chase 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.
Building Activity in Roseville Chase Right Now
Roseville Chase is seeing steady residential activity — extensions are picking up as families choose to upsize their existing home rather than face stamp duty on a move. Buildana sits inside that pipeline — we know what's getting approved, what's stalling, and why.
Builder's Take on Roseville Chase
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.
Roseville Chase vs Nearby Suburbs
Roseville Chase vs nearby suburbs — key metrics for extending.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| Roseville Chase2069this suburb | $3.0M–$5.5M | 700–1,400m² | Class M | 1920s–1960s (heavy heritage stock) | Roseville (2 km) |
| Roseville2069 | $2.8M–$4.2M | 750–1,200m² | Class M | 1920s–1960s (heavy heritage stock) | Roseville |
| Castle Cove2069 | $3.0M–$4.5M | 700–1,200m² | Class M–H | 1960s–1990s | Roseville (3 km) |
| East Lindfield2070 | $2.8M–$4.2M | 800–1,500m² | Class M–H | 1930s–1970s | Lindfield (2 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.
Have a question about your project?
Talk to our team — free site assessment and fixed-price quote.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $117,000 – $230,000 |
| Medium rear/side extension (30–60m²) | $230,000 – $420,000 |
| Large ground-floor extension (60–100m²) | $420,000 – $650,000 |
| Second-storey addition (60–120m²) | $360,000 – $720,000 |
| Wrap-around (ground + 1st floor) | $650,000+ |
| 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. Free consultation at your Roseville Chase home. We inspect the existing structure, check Ku-ring-gai Council's controls, measure available space, and discuss what you need. You get a clear scope, budget range, and timeline before committing. Two design moves are usually on the table: match the existing house so the extension reads as original, or contrast with it so the new section is clearly modern. Both work — choice is aesthetic, and we'll show 3D renders of both before you commit.
⏱The Roseville Chase construction phase. Fixed price, programmed, supervised. CDC (10–15 business days) or DA through Ku-ring-gai Council depending on scope. Structural engineering, BASIX, and all documentation prepared and lodged. Construction Certificate obtained. Construction phase connects new to existing — footings, frame, roof tie-in, waterproofing at junction, internal fit-out and external finish. Staged works minimise disruption to your daily routine in Roseville Chase.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Final inspection focuses on the integration: paint blend, flooring transitions, ceiling height, junction waterproofing, sound transmission. The extension shouldn't feel bolted on — it should feel like the house was always meant to be this size.
⏱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
Ready to take the next step?
Free consultation — no obligation, no pressure.
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
Buildana builds across greater Sydney — with deep roots in Western Sydney's Fairfield, Liverpool, Cumberland, Canterbury-Bankstown, and Blacktown LGAs.
Last updated: 1 April 2026
Explore Related Topics
Roseville Chase Extension — Free Consultation
Free design consultation for Roseville Chase 2069. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your Project