Licensed Home Extension Builder Warrawee
NSW licensed extension specialist. Warrawee 2074 extensions on 1920s–1960s (heavy heritage stock)-era homes require structural sign-off, Class M footings, and matched connection — we engineer and document properly.
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MBA NSW0476 300 300Quick Answer
A home extension in Warrawee 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.
Second-Storey & Rear Additions in Warrawee
Extensions in Warrawee are heritage-heavy — Heritage Conservation Areas cover most of the suburb, and even rear additions get reviewed for character compatibility and roof form. Lots 900–1,500m². Knox/Abbotsleigh catchment. Realistic plan: full DA, character-respecting design, articulated form. Budget $400K–$800K with the heritage premium and Council review timeline baked in.
Most Warrawee blocks run 900–1,500m² on Class M 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: $3.2M–$4.6M. Local services anchor around Warrawee station & Abbotsleigh proximity.
Buildana manages the complete home extension process in Warrawee — 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 Warrawee 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 Warrawee 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 Warrawee?
Warrawee is the smallest premium pocket in the LGA — sits between Turramurra and Wahroonga on the T1 North Shore line. Blocks run 900–1,500m², heritage Federation and inter-war homes line the back streets, and the Knox/Abbotsleigh catchment lifts the floor price. Heritage Conservation Areas cover several streets, which means most KDR proposals here go through a full DA rather than CDC.
Warrawee's established streetscape and median house prices of $3.2M–$4.6M reflect a premium location within Ku-ring-gai. Building costs sit above the metro average, offset by stronger capital growth and rental returns. Warrawee benefits from Warrawee station on the doorstep — walkable rail access lifts both rental demand and property values. 1920s–1960s (heavy heritage stock)-era homes in Warrawee often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Soil conditions in Warrawee (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 Warrawee — key facts
- Suburb
- Warrawee, NSW 2074
- Council / LGA
- Ku-ring-gai Council (Ku-ring-gai)
- Primary zoning
- R2 Low Density
- Typical lot size
- 900–1,500m²
- Soil class
- Class M
- Median house price
- $3.2M–$4.6M
- 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 Warrawee — Local Context
Warrawee Block Realities
Typical Warrawee blocks are 900–1,500m² on Class M ground (moderately reactive). 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 Warrawee blocks: $15,000–$32,000.
Approval Timeline for Warrawee
Realistic timeline for a extension in Warrawee: 8–14 weeks for DA through Ku-ring-gai 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.
What a Extension Costs in Warrawee
Warrawee's median house price sits at $3.2M–$4.6M. That's the number that decides whether a home extension stacks up financially. If you're spending more than 50% of $3.2M–$4.6M 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.
Building to Suit Warrawee
Warrawee's R2 Low Density zoning, 900–1,500m² blocks, and 1920s–1960s (heavy heritage stock) 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 Warrawee Builds Stall
Builds in Warrawee stall for predictable reasons. Lodgement defects (missing BASIX, wrong drawing scale, undeclared overlays). Soil surprises on Class M 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. Ku-ring-gai 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 Warrawee
Ku-ring-gai Council setback and height rules apply to the extension, not the whole house. An older Warrawee home that was built inside the setback might not be extendable to the boundary. We check that during feasibility so there's no expensive surprise at DA stage.
Timing on Warrawee extensions typically runs 14–24 weeks for ground-floor additions, 20–32 weeks for second-storey. Living in the house during the build is possible but requires staging — we plan around it so the kitchen and main bathroom aren't out at the same time.
Warrawee vs Nearby Suburbs
Warrawee vs nearby suburbs — key metrics for extending.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| Warrawee2074this suburb | $3.2M–$4.6M | 900–1,500m² | Class M | 1920s–1960s (heavy heritage stock) | Warrawee |
| Turramurra2074 | $2.8M–$4.2M | 700–1,100m² | Class M | 1920s–1960s (heavy heritage stock) | Turramurra |
| Wahroonga2076 | $3.0M–$4.6M | 800–1,500m² | Class M | 1920s–1960s (heavy heritage stock) | Wahroonga |
| South Turramurra2074 | $2.8M–$4.2M | 800–1,500m² | Class M–H | 1920s–1960s (heavy heritage stock) | Turramurra (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.
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Cost Guide
| Item | Estimated Range |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $117,000 – $260,000 |
| Moderate extension (multiple openings, roof extended) | $260,000 – $490,000 |
| Complex extension (structural steel portals, re-roofing) | $490,000 – $780,000 |
| Second-storey tie-in (existing house re-engineered) | $460,000 – $850,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
The first job on an extension is finding out what you're extending onto. Warrawee homes from the 1920s–1960s (heavy heritage stock) were built to different standards — we open walls, check footings, verify load paths. The existing house has to carry the new work.
⏱Design follows the existing roof. A bad extension looks like a bolt-on; a good one reads as original. Matched brickwork or contrasting render (whichever the architecture calls for), tied-in roofline, continuous flooring where it should be continuous.
⏱Construction happens while you live in the house. That means weatherproofing every night, staging the works so kitchens and bathrooms don't disappear on the same week, and keeping the site clean of debris that doesn't belong in a family home.
⏱Finish is seamless. Paint match, floor match, roofline match, brick match where possible. The only way to tell the extension is new is the date on the plans.
⏱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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