Home Extension Builder Seven Hills — More Space, Same Address
Fixed-price home extensions in Seven Hills 2147. Ground floor, second storey and rear additions. Blacktown City Council approvals managed. Free design consultation.
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MBA NSW0476 300 300Quick Answer
A home extension in Seven Hills costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Blacktown City Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Seven Hills
Seven Hills features family homes from the 1960s–1980s era on generous blocks (many exceeding 650m²) — plenty of room for ground-floor extensions or second-storey additions. The family-friendly suburb makes extending ideal for those wanting more space without changing school catchments. Blacktown City Council controls apply — Buildana assesses and manages all requirements.
Buildana manages the complete home extension process in Seven Hills — 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 Seven Hills from $150K
- Blacktown City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class H soil — structural engineering included
- 1960s–1980s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Seven Hills 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 Seven Hills?
Seven Hills is a family-friendly suburb with generous block sizes and a mix of 1960s–1980s housing stock. Many homes are ready for knockdown rebuild or extension, supported by R2 zoning and proximity to Seven Hills station and M2/M7 motorways.
Seven Hills's mix of 1960s–1980s-era housing on 550–700m² blocks creates strong opportunity for property improvement. Median prices of $900K–$1.15M support quality build investment. Seven Hills benefits from Seven Hills station on the doorstep — walkable rail access lifts both rental demand and property values. 1960s–1980s-era homes in Seven Hills often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Soil conditions in Seven Hills (Class H, highly reactive) are factored into every Buildana foundation design.
Home extensions in Blacktown LGA suit the area's 1970s–1990s housing stock, which typically has good structural foundations and spacious layouts. Common projects include kitchen-living extensions, covered alfresco areas, and second-storey additions in suburbs like Seven Hills, Kings Langley, and Quakers Hill. Council requires DA for extensions varying by scope. Buildana manages structural assessment through to handover.
Planning Controls — Blacktown City Council
Blacktown LEP 2015 & DCP Section 6. R2 zones: FSR 0.5:1, building height 9m, front setback 4.5m–6m (varies by lot width), landscaped area 30%. CDC-eligible designs can fast-track approval to 10–15 business days.
Have a question about your project?
Talk to our team — free site assessment and fixed-price quote.
How It Works
From First Call to Final Key
On-site assessment of your 1960s–1980s-era home in Seven Hills. We check structural condition, block dimensions (550–700m²), setback availability, and Blacktown City Council's DCP requirements. Written feasibility and cost estimate provided.
⏱Extension designed to integrate with your existing Seven Hills home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱We lodge your extension approval — CDC for eligible designs or DA through Blacktown City Council. Full documentation including structural engineering for Class H soil, BASIX, and shadow diagrams. CC issued before works start.
⏱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 Seven Hills.
⏱Final inspection, Occupation Certificate, 6-year structural warranty. Your Seven Hills home now has the space your family needs.
⏱Quality Promise
Every Buildana home extension in Seven Hills is delivered under a fixed-price contract — from design consultation through to defect-free handover.
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
Cost Guide
| Item | Estimated Range |
|---|---|
| Rear ground-floor extension | $140,000 – $280,000 |
| Second-storey addition | $280,000 – $470,000 |
| Large multi-room extension | $370,000 – $560,000+ |
| Structural engineering | $3,000 – $7,000 |
| Council contributions | $2,000 – $14,000 |
| Temporary weatherproofing | $2,000 – $5,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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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.
Extend Your Home in Seven Hills
Free design consultation for Seven Hills 2147. We'll assess your home, design the extension, and provide a fixed-price quote.
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