Home Extension Builder Granville — More Space, Same Address
Fixed-price home extensions in Granville 2142. Ground floor, second storey and rear additions. Cumberland City Council approvals managed. Free design consultation.
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MBA NSW0476 300 300Quick Answer
A home extension in Granville costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Cumberland City Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Granville
Granville's ageing homes from the 1920s–1960s era are frequently extended rather than demolished, particularly where heritage considerations apply. Rear extensions and second-storey additions can transform a compact home into a spacious modern residence. Cumberland City Council heritage provisions may apply in some areas — Buildana checks these upfront.
Buildana manages the complete home extension process in Granville — 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 Granville from $150K
- Cumberland City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M soil — structural engineering included
- 1920s–1960s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Granville 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 Granville?
Granville is a character-rich suburb with a heritage precinct and substantial housing renewal underway. Many older homes on wide blocks are candidates for knockdown rebuild or duplex construction, supported by strong R2 and R3 zoning.
Granville sits in the Cumberland City local government area with 450–700m² residential blocks and R2 Low Density & R3 Medium Density zoning. Building costs are around the Sydney metro average, balancing construction value with lifestyle and growth. Granville station gives Granville direct rail access — a strong draw for residents and tenants. 1920s–1960s-era homes in Granville often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Ground conditions (Class M) across Granville are well understood by local builders — Buildana's engineering accounts for moderately reactive soil movement.
Home extensions across Cumberland LGA are popular in suburbs like Greystanes, Girraween, and Wentworthville where 1970s–1990s homes have good structural foundations worth building upon. Rear living extensions, second-storey additions, and master suite upgrades are the most common projects. Cumberland Council requires DA for extensions exceeding certain thresholds. Buildana manages structural engineering, design, approvals, and fixed-price construction.
Planning Controls — Cumberland City Council
Cumberland LEP 2021 & DCP. R2 zones: FSR 0.5:1, R3 zones: FSR 0.7:1, building height 9m, front setback 6m, landscaped area 35%. Heritage items and conservation areas apply in parts of Granville and Auburn. CDC available for eligible designs.
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
Free consultation at your Granville home. We inspect the existing structure, check Cumberland City Council's controls, measure available space, and discuss what you need. You get a clear scope, budget range, and timeline before committing.
⏱Design phase covers the extension layout, junction with existing structure, window and door placement, and external finish to match your Granville home's streetscape. Multiple design options presented.
⏱CDC (10–15 business days) or DA through Cumberland City Council depending on scope. Structural engineering, BASIX, and all documentation prepared and lodged. Construction Certificate obtained.
⏱Fixed-price construction of your extension. New footings engineered for Class M soil, structural connection to existing home, frame, fit-out, and finishes. Weekly updates from your project manager.
⏱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.
⏱Quality Promise
Every Buildana home extension in Granville 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 | $150,000 – $310,000 |
| Second-storey addition | $310,000 – $520,000 |
| Large multi-room extension | $410,000 – $620,000+ |
| Structural engineering | $3,000 – $8,000 |
| Council contributions | $2,000 – $15,000 |
| 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.
Last updated: 1 April 2026
Extend Your Home in Granville
Free design consultation for Granville 2142. We'll assess your home, design the extension, and provide a fixed-price quote.
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