Home Extension Builder The Spit — Approved in 60 Days
The Spit 2088 extensions with tight approval timelines. CDC where eligible (~15 days), DA via Mosman Council in 40–60 days. Construction 12–24 weeks depending on scope.
HIA Member
MBA NSW0476 300 300Second-Storey & Rear Additions in The Spit
A home extension at The Spit is about the water. The heritage homes on 600 to 1,500m² blocks fall away to Middle Harbour, right by the marinas and the boating that define the pocket, so the wing is built to open the living toward that outlook — the view and the water access are the whole reason the address is worth what it is.
The heritage areas steer a conserve-and-add approach, and the fall is engineered early rather than improvised. The headline underground cost is the deep sandstone rock, which is priced from the geotech up front, and the pre-war fabric gets licensed handling.
At a $4.5M to $10M median, a wing that earns the harbour is a sound investment — built on a clear-eyed reading of the rock and the fall rather than optimism.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with rock and fall priced, before you commit.
Buildana manages the complete home extension process in The Spit — 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 The Spit from $150K
- Mosman Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1900s–1950s heritage-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near North Sydney (7 km) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
The outlook is the point
The Spit's premium is the harbour and the boating on its doorstep, and the wing earns it — living opened to the water down the engineered fall, with the levels and glazing the outlook deserves.
The 600 to 1,500m² blocks give the design generous room.
Rock, fall and fabric
Deep rock is typical where the structure changes, so it is priced from the geotech, and the fall is engineered early.
The pre-war hazards run as licensed processes, all in the scope before you commit.
Home extension builder in The Spit — key facts
- Suburb
- The Spit, NSW 2088
- Council / LGA
- Mosman Council (Mosman)
- Primary zoning
- R2 Low Density
- Typical lot size
- 600–1,500m²
- Soil class
- M
- Median house price
- $4.5M–$10M
- Home era
- 1900s–1950s heritage
- 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
Want a real number for YOUR block — not a generic estimate?
Free site assessment, fixed-price contract, line-itemised quote within 48 hours. No high-pressure sales — just a real builder talking real numbers.
Last updated: 1 April 2026
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Free design consultation for The Spit 2088. We'll assess your home, design the extension, and provide a fixed-price quote.
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in The Spit 2088. Mosman Council regulations and local controls are covered on each page.