Home Extension Penrith — Design, Approval, Structural, Build
Full-service extensions in Penrith 2750: structural survey of existing 1960s–1980s fibro/brick veneer (Cranebrook/Werrington/Cambridge Park/Kingswood/St Marys) + 1990s–2010s brick (Glenmore Park/Cambridge Gardens) + 2010s+ master-planned (Jordan Springs/Caddens/Claremont Meadows) home, design, Penrith City Council approval, engineering, weatherproofed construction, matched finish to original dwelling.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Penrith costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Penrith City Council approvals, and construction under one fixed-price contract.
Penrith Home Extensions & Additions
A home extension in Penrith holds a house on land the CBD keeps re-rating. R4 high-rise is rolling out around the town centre, Westfield and Nepean Hospital front the station, and the Federation and inter-war character on the side streets, along with 1960s to 1980s brick on the wider pockets, is becoming the scarce detached stock. Extending near a growing regional CBD builds space into an appreciating asset.
One local factor matters more than most: the western edge sits on Hawkesbury-Nepean alluvial ground with flood planning controls, so any addition there needs floor levels and construction that meet the flood requirement, and we check the mapping before design. Away from the flood plain, the era of the walls decides up or out, and the hospital precinct keeps tenant demand strong for any extra bedroom.
What I would check first on your Penrith house: whether you sit in the flood planning area, the era of the walls, and any R4 rezoning nearby. Those shape the plan.
We build these fixed-price, licence HBL 487805C. Get us to check the flood mapping and your block first.
Buildana manages the complete home extension process in Penrith — 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 Penrith from $150K
- Penrith City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- M — structural engineering included
- 1960s–1980s fibro/brick veneer (Cranebrook/Werrington/Cambridge Park/Kingswood/St Marys) + 1990s–2010s brick (Glenmore Park/Cambridge Gardens) + 2010s+ master-planned (Jordan Springs/Caddens/Claremont Meadows)-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Penrith station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Land the CBD re-rates
R4 high-rise is rolling out around the town centre, Westfield and Nepean Hospital front the station, and detached character and brick stock is becoming scarce.
Extending near a growing regional CBD builds space into an appreciating asset, with hospital-precinct tenant demand behind any extra bedroom.
Mind the flood plain
The western edge sits on Hawkesbury-Nepean alluvial ground with flood planning controls, so any addition there needs floor levels and construction that meet the flood requirement.
We check the mapping before design. Away from the flood plain, the era of the walls decides up or out.
Home extension builder in Penrith — key facts
- Suburb
- Penrith, NSW 2750
- Council / LGA
- Penrith City Council (City of Penrith)
- Primary zoning
- R2
- Typical lot size
- 450–750m² typical (Cranebrook/Werrington/Cambridge Park/Kingswood/St Marys); 250–450m² master-planned (Jordan Springs/Caddens/Glenmore Park new release)
- Soil class
- M
- Median house price
- $850K–$1.3M typical; $1.0M–$1.6M Glenmore Park/Jordan Springs premium master-planned; $1.6M–$3.0M+ Mulgoa/Wallacia/Castlereagh acreage
- Home era
- 1960s–1980s fibro/brick veneer
- 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.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Free consultation at your Penrith home. We inspect the existing structure, check Penrith City Council's controls, measure available space, and discuss what you need. You get a clear scope, budget range, and timeline before committing. Two design moves are usually on the table: match the existing house so the extension reads as original, or contrast with it so the new section is clearly modern. Both work — choice is aesthetic, and we'll show 3D renders of both before you commit.
⏱The Penrith construction phase. Fixed price, programmed, supervised. CDC (10–15 business days) or DA through Penrith City Council depending on scope. Structural engineering, BASIX, and all documentation prepared and lodged. Construction Certificate obtained. 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 Penrith.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Final inspection focuses on the integration: paint blend, flooring transitions, ceiling height, junction waterproofing, sound transmission. The extension shouldn't feel bolted on — it should feel like the house was always meant to be this size.
⏱Quality Promise
Every Buildana home extension in Penrith is delivered under a fixed-price contract — from design consultation through to defect-free handover.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $90,000 – $180,000 |
| Medium rear/side extension (30–60m²) | $180,000 – $320,000 |
| Large ground-floor extension (60–100m²) | $320,000 – $500,000 |
| Second-storey addition (60–120m²) | $280,000 – $550,000 |
| Wrap-around (ground + 1st floor) | $500,000+ |
| Structural engineering & tie-in | Included |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
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
Explore Related Topics
Start a Penrith Home Extension
Free design consultation for Penrith 2750. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Penrith
Other Buildana services in Penrith
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Penrith 2750. Penrith City Council regulations and local controls are covered on each page.