Home Extension Builder Mona Vale — From $150K Fixed Price
Fixed-price home extensions in Mona Vale 2103. Rear extension $150K–$300K, second storey $300K–$500K. Northern Beaches Council approvals managed. Free site consult.
HIA Member
MBA NSW0476 300 300Mona Vale Home Extensions — Fixed Price
A home extension in Mona Vale reads the block's position — the town-centre R3 carries value the wing is checked against, the beach streets grow set-back view levels, and the settled middle extends on the era read.
Salt-grade materials apply near the sand, the heritage stock keeps its faces, and the era fabric gets licensed handling.
At the $2.6M to $5M+ market, the addition beats the friction of trading up the peninsula.
We build these fixed-price, licence HBL 487805C. Get our extension scope, with the position read, before you commit.
Buildana manages the complete home extension process in Mona Vale — 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 Mona Vale from $150K
- Northern Beaches Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Hawkesbury Sandstone — structural engineering included
- 1920s–1960s heritage + apartments + premium contemporary-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near B-Line bus to CBD (Mona Vale interchange + terminus) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Three positions, three answers
Mona Vale splits into the R3-checked centre, the view-chasing beach streets and the settled middle — and the extension logic differs across all three.
The peninsula's hub amenity holds every metre added.
Coast and era handled
Salt-grade materials apply near the sand, and the era fabric gets licensed handling where disturbed.
Both sit in the quote from the outset, costed by the position not guessed.
Home extension builder in Mona Vale — key facts
- Suburb
- Mona Vale, NSW 2103
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 450–800m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $2.6M–$5M+ (oceanfront)
- Home era
- 1920s–1960s heritage + apartments + premium contemporary
- 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.
Quality Promise
Every Buildana home extension in Mona Vale is delivered under a fixed-price contract — from design consultation through to defect-free handover.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Walk through your Mona Vale home with our designer and structural engineer. We measure, photograph, and check the bones — footings, frame condition, roof structure. The cost estimate that follows is grounded in what we found, not a generic per-m² number. Our designer works with your existing home's layout — connecting new living areas to existing rooms, matching materials and roof pitch, and maximising natural light. You approve floor plans and 3D renders before we proceed.
⏱The Mona Vale construction phase. Fixed price, programmed, supervised. Most rear extensions in Mona Vale qualify for CDC — cleaner, faster, no neighbour notification. Second-storey additions typically need DA through Northern Beaches Council because of overshadowing and privacy assessments. We choose based on your design, not on what's easier to lodge. Extension built from new footings to completion — connecting structurally to your existing home. Class Hawkesbury Sandstone soil design managed. Temporary weatherproofing maintains liveability where possible.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Walk through the completed extension, confirm finishes, collect your OC. Six-year structural warranty covers all new work including the junction with your existing home. Maintenance guide provided.
⏱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
Still got questions? Talk to Oliver directly.
30-min free call — bring your block, your brief, your budget. We'll map out feasibility, timeline, and realistic cost. No sales pitch.
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
Headquartered in Western Sydney's Fairfield. Active across all 28 metropolitan Sydney LGAs — from Penrith to the Eastern Suburbs, the Hills to the Sutherland Shire.
Last updated: 1 April 2026
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Start a Mona Vale Home Extension
Free design consultation for Mona Vale 2103. We'll assess your home, design the extension, and provide a fixed-price quote.
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Other Buildana services in Mona Vale
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Mona Vale 2103. Northern Beaches Council regulations and local controls are covered on each page.