Licensed Home Extension Builder Marayong
NSW licensed extension specialist. Marayong 2148 extensions on 1970s–1990s-era homes require structural sign-off, Class M–H footings, and matched connection — we engineer and document properly.
HIA Member
MBA NSW0476 300 300Quick Answer
A home extension in Marayong 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.
Extending Homes in Marayong
A home extension in Marayong keeps the station walk at a price the rest of Sydney cannot touch. These are 1970s to 1990s homes on 550 to 700m² blocks, close enough to the platform that a rear wing lets you add the room without trading away the commute — and at this entry point the money stays firmly on your side of the ledger.
The brick extends cleanly at ground level, keeping the structure predictable. The older homes get a fibro check with a licensed strip-out where it turns up, and on reactive pockets the footing junction between old and new is engineered to move as one.
At an $800K to $1.0M median, the cost of upsizing would build a fair slice of the addition by itself. The rail keeps demand for the finished home steady.
We build these fixed-price, licence HBL 487805C. Ask us to measure what your block can hold.
Buildana manages the complete home extension process in Marayong — 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 Marayong from $150K
- Blacktown City Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M–H soil — structural engineering included
- 1970s–1990s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Marayong station
Reviewed by Oliver Alameri
Licensed Builder (NSW 487805C) · Master of Property Development · PhD Student · Building across Western Sydney since 2010
Value with the train attached
Marayong's affordable entry and the walk to the station make the extension maths generous — bedrooms and living added at a cost the median rewards, with the commute staying a walk.
The 550 to 700m² blocks take the family addition comfortably, without forcing a second storey.
Fibro and clay handled
On the older homes we check for fibro and strip it out under licence wherever it appears.
On reactive pockets the footing junction is engineered to move with the house, and both jobs are inside the fixed price from the start.
Home extension builder in Marayong — key facts
- Suburb
- Marayong, NSW 2148
- Council / LGA
- Blacktown City Council (Blacktown City)
- Primary zoning
- R2 Low Density
- Typical lot size
- 550–700m²
- Soil class
- Class M–H
- Median house price
- $800K–$1.0M
- Home era
- 1970s–1990s
- 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.
Cost Guide
| Item | Estimated Range |
|---|---|
| Small rear extension (up to 30m²) | $84,000 – $170,000 |
| Medium rear/side extension (30–60m²) | $170,000 – $300,000 |
| Large ground-floor extension (60–100m²) | $300,000 – $470,000 |
| Second-storey addition (60–120m²) | $260,000 – $510,000 |
| Wrap-around (ground + 1st floor) | $470,000+ |
| Structural engineering & tie-in | Included |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
Everything that has to be right before we touch the ground. Extension feasibility comes down to two things: what the existing structure can carry, and what Blacktown City Council will let you build. We assess both at the consultation — no point designing for a second storey if the slab can't take the load. Extension designed to integrate with your existing Marayong home — matching roof lines, materials, and flow between old and new sections. Floor plans, elevations, and 3D renders.
⏱The Marayong construction phase. Fixed price, programmed, supervised. All approval documentation prepared: structural drawings, BASIX, shadow analysis, stormwater, and statement of environmental effects (if DA). Lodged and managed through to Construction Certificate. Extension construction takes 3–6 months on average. Footings excavated and poured to match existing depth on Class M–H soil, frame stand, roof tie-in (most weather-critical phase), lock-up, then internal fit-out at the same standard as the existing house.
⏱The job isn't done when the site's clean; it's done when you have keys, certificates and warranties. Defect-free inspection, OC issued, 6-year warranty on all new work. Junction between old and new sections waterproofed and warranted. Maintenance guide covers care of new and existing areas.
⏱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
Extend Your Home in Marayong
Free design consultation for Marayong 2148. We'll assess your home, design the extension, and provide a fixed-price quote.
Start Your ProjectMore in Marayong
Other Buildana services in Marayong
Costs, approval pathway and fixed-price contract detail for every other build type we deliver in Marayong 2148. Blacktown City Council regulations and local controls are covered on each page.