Licensed Custom Home Builder Seaforth — Design & Construct
NSW licensed builder (Oliver Alameri) delivering fixed-price custom homes across Seaforth 2092. Engineered slab for Class Hawkesbury Sandstone soil, BASIX 2025, 6-year structural warranty.
HIA Member
MBA NSW0476 300 300Seaforth Custom Home Construction
A custom home in Seaforth is a Middle Harbour-fall build where the engineering and the harbour outlook are the same conversation. This premium peninsula runs Federation, inter-war and contemporary homes on 600 to 1,500m2 blocks with substantial sandstone fall to Middle Harbour, and at a $3.5M to $10M-plus harbour-front market the site rewards a home designed to step down to the water. The coming Beaches Link Tunnel, with a Seaforth portal opening in 2028, is reshaping access to the area.
This is Hawkesbury Sandstone with deep rock excavation running $60K to $150K on many sites, so the substructure is engineered and priced honestly up front. Heritage Conservation Areas cover the older streets, so the status check comes first, and a level-changing design that works with the fall captures the harbour outlook owners pay for. The steeper the block, the more the design earns its keep.
What I would check first on your Seaforth block: the rock and substructure cost, the heritage status, and how the home steps to the harbour. Those set the home.
We build these fixed-price, licence HBL 487805C. Show us your fall and outlook and we will design to it.
Buildana's design-and-construct service covers everything — from initial design brief and land assessment through to council approval and fixed-price construction. One builder, one contract, one point of contact.
Read our Complete Custom Home Guide or explore custom home builds across Sydney.
- Custom homes in Seaforth from $450K
- Designed for your 600–1,500m² block
- Northern Beaches Council DA and CDC approvals managed
- Seaforth zoned R2 Low / R3 Medium (Manly, Dee Why, Brookvale, Mona Vale, Avalon town centres) / RU2 Rural Landscape (Ingleside, Terrey Hills, Duffys Forest, Oxford Falls) / E3/E4 Environmental on bushland fringe
- Single and double storey designs
- Hawkesbury Sandstone — engineered slab included
- 6-year structural warranty
- Free consultation — near B-Line bus to CBD via Mosman + Beaches Link Tunnel (opening 2028) station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Designed to step to the harbour
This premium peninsula runs Federation, inter-war and contemporary homes on 600 to 1,500m2 blocks with substantial sandstone fall to Middle Harbour.
At a $3.5M to $10M-plus harbour-front market a level-changing design captures the outlook, with the Beaches Link reshaping access.
Deep rock and heritage
This is Hawkesbury Sandstone with deep rock at $60K to $150K, so the substructure is engineered and priced honestly up front.
Heritage Conservation Areas cover the older streets, so the status check comes first before design.
Custom home builder in Seaforth — key facts
- Suburb
- Seaforth, NSW 2092
- Council / LGA
- Northern Beaches Council (Northern Beaches)
- Primary zoning
- R2 Low
- Typical lot size
- 600–1,500m²
- Soil class
- Hawkesbury Sandstone
- Median house price
- $3.5M–$10M+ (harbour-front)
- Home era
- 1900s–1940s heritage + premium contemporary
- Typical price range
- $450,000 – $1,200,000+
- Typical timeline
- 12–20 months design to handover
- Approval pathway
- CDC fast-track (15 business days) or DA (40–90 days)
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
Buildana's Seaforth custom homes: designed from scratch for your block, engineered to compliance, priced before we break ground.
How It Works
From First Call to Final Key
We start at the kerb. Before a single sketch, we stand on your Seaforth block and work out what the land wants — sun path, slope, views, neighbours, the R2 Low envelope we've got to design inside. That walk determines almost every decision that follows.
⏱Design happens in layers. First the plan — where the kitchen is, how the bedrooms stack, what the morning routine looks like. Then the envelope — roof pitch, eave depth, window sizes matched to the Seaforth climate. Then the finishes. Nothing gets drawn without a reason you can point to.
⏱Documentation is the unglamorous part, but it's where most projects go wrong. Engineering for Class Hawkesbury Sandstone soil, BASIX 2025, Northern Beaches Council drawings, hydraulics, stormwater. We stage it so the certifier approves the first time — not the fourth.
⏱Then we build. Programme in hand, trades booked, material orders placed weeks before they're needed so nothing waits on delivery. Weekly update, monthly milestone walk, defects fixed as we go rather than collected at the end.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
Estimate Your Build Cost
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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
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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 July 2025
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Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Seaforth 2092. Northern Beaches Council regulations and local controls are covered on each page.