Home Extension Builder Concord — From $150K Fixed Price
Fixed-price home extensions in Concord 2137. Rear extension $150K–$300K, second storey $300K–$500K. City of Canada Bay Council approvals managed. Free site consult.
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A home extension in Concord costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, City of Canada Bay Council approvals, and construction under one fixed-price contract.
Home Extension Builder in Concord
Extension in Concord is Federation cottage, inter-war Tudor and Spanish Mission additions on 500–900m² blocks. HCAs restrict scope on character streets. Realistic budget $300K–$800K for 70–140m² addition. Pre-construction 5–7 months.
On the ground in Concord (2137), the practical numbers shape every home extension. Class M–H (Wianamatta Shale) / H (river/bay fall) soil — moderately to highly reactive clay — pushes engineered foundation work into the $24,000–$42,000 bracket on most 500–900m² blocks. R2 Low / R3 Medium / R4 (Rhodes/Concord West) zoning under City of Canada Bay Council sets the building envelope, with R3 Medium Density pockets that open up dual occupancy options on qualifying lots. Median sale price across Concord sits at $2.2M–$4M, which frames the build-versus-buy decision from the start. Nearest rail is Concord West (1 km), and that proximity affects everything from rental demand to construction site access.
Buildana manages the complete home extension process in Concord — 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 Concord from $150K
- City of Canada Bay Council DA and CDC approvals managed
- Ground floor, rear and second-storey additions
- Class M–H (Wianamatta Shale) / H (river/bay fall) soil — structural engineering included
- 1900s–1960s-era homes assessed for extension suitability
- Connect new to existing — clean, matched finish
- 6-year structural warranty
- Free design consultation — near Concord West (1 km) 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 Concord?
Concord is the inland heart of the LGA — Federation cottages, inter-war Tudor and Spanish Mission, post-war stock on 500–900m² blocks. Heritage Conservation Areas cover several streets. Wianamatta Shale soil. Concord Hospital and Concord Oval landmarks.
Residential blocks of 500–900m² across Concord (2137) provide solid building envelopes for a range of project types. City of Canada Bay Council manages planning controls with well-established DCP provisions. Transport access via Concord West (1 km) connects Concord to the wider Sydney network. 1900s–1960s-era homes in Concord often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Class M–H (Wianamatta Shale) / H (river/bay fall) soil (moderately to highly reactive) is standard for Concord — Buildana includes engineered slab design in every quote.
Extension is the dominant scope across the Canada Bay riverside heritage peninsulas (Abbotsford, Chiswick, Cabarita, parts of Drummoyne, Mortlake) where KDR is restricted. Federation cottage additions, inter-war heritage extensions, river-fall heritage-grade work all common. Suspended slabs on river-fall sites; foreshore consent on direct waterfront lots. Heritage Council expects retention of stained glass, ornate plasterwork, slate roofing on protected streets. Apartment renovations the other major category — Rhodes high-rise, Concord West / North Strathfield station precincts, Liberty Grove townhouses. Realistic budget $300K–$900K for thoughtful 60–130m² addition; $700K–$1.8M premium river-fall heritage-grade work.
Planning Controls — City of Canada Bay Council
Canada Bay LEP 2013 & Canada Bay DCP 2017. R2 Low Density covers most older residential streets: FSR 0.5–0.55:1, building height 8.5–9m, front setback 6–7.5m, landscaped area 35–40%. R3 Medium Density along Lyons Road, Great North Road, Concord Road and Parramatta Road permits FSR up to 0.85:1. R4 High Density and B4 Mixed Use concentrated on Rhodes peninsula (Rhodes Waterside, Concord Road towers), Concord West / North Strathfield station precincts, and Five Dock village (gearing up for Sydney Metro West 2030 — Five Dock station precinct already designated TOD). Heritage Conservation Areas cover the riverside peninsulas (Abbotsford, Chiswick, Cabarita, Mortlake, Drummoyne) plus pockets in Concord, Five Dock, Russell Lea, Wareemba, Rodd Point. Tree Preservation Order LGA-wide. Wianamatta Shale soil with sandstone outcrops on the river-fall peninsulas — fall to Parramatta River, Iron Cove, Hen and Chicken Bay, Canada Bay drives suspended slab engineering on premium river-fall lots. Five Dock Sydney Metro West (under construction, opening 2030) is the LGA's signature planning event — station-precinct overlay opens density bonuses inside 400m of Five Dock station. Rhodes peninsula has industrial-legacy soil contamination management protocols on remediated former Union Carbide site.
Home extension builder in Concord — key facts
- Suburb
- Concord, NSW 2137
- Council / LGA
- City of Canada Bay Council (City of Canada Bay)
- Primary zoning
- R2 Low / R3 Medium / R4 (Rhodes/Concord West)
- Typical lot size
- 500–900m²
- Soil class
- Class M–H (Wianamatta Shale) / H (river/bay fall)
- Median house price
- $2.2M–$4M
- Home era
- 1900s–1960s
- 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
Building in Concord — Local Context
Site & Ground Conditions in Concord
Concord sits on Class M–H (Wianamatta Shale) / H (river/bay fall) soil — moderately to highly reactive clay. For a home extension, that rules out the cheapest off-the-shelf slab designs straight away. and pushes engineered footings into the $24,000–$42,000 range on most 500–900m² blocks here. Geotechnical testing isn't optional — every Buildana extension in Concord starts with a borehole report so the slab and footings are sized to your actual block, not a generic spec. Skipping that step is how you end up with cracked cornices and sticking doors three years in. Drainage design matters too — overland flow paths on Concord's topography can collect water against rear setbacks if the contour survey is sloppy.
City of Canada Bay Planning Context
City of Canada Bay has its own LEP and DCP layered over State planning controls. For extending in Concord, the practical impact: City of Canada Bay Council's DCP sets local rules for streetscape character, materials palette in some precincts, vehicle crossover widths, and tree retention. R2 Low / R3 Medium / R4 (Rhodes/Concord West) zoning on most Concord blocks permits single dwellings, alterations, and additions. Buildana checks every overlay (heritage, bushfire, flood, acid sulfate soil, biodiversity) before quoting.
Cost vs Value in Concord
Median sale price in Concord is $2.2M–$4M. For a extension, the decision tree runs through three numbers: build cost, expected post-completion value, and how long you plan to hold. Ground-floor extensions of 30–50m² typically return 1.1–1.3× their cost at sale in suburbs around $2.2M–$4M. Second-storey adds tend to outperform — 1.3–1.6× — because they unlock larger family layouts on standard blocks. We map this in feasibility before you commit.
Lifestyle Fit in Concord
Concord has a settled residential character. Concord West (1 km) from the nearest station. Local landmark: Concord Hospital & Concord Oval. For families extending here, the design considerations that matter day-to-day: orientation for natural light (north-facing living wherever the lot allows), separation between adult and kids' zones, a kitchen that opens to outdoor entertaining, garage size that fits a real family vehicle plus storage, and a layout that doesn't require renovating again in 10 years as the kids grow. Buildana designs for the long arc of how families actually use a home, not just the showroom photo.
City of Canada Bay Council Processing & Concord Activity
City of Canada Bay Council processes thousands of residential applications a year across the City of Canada Bay LGA, and Concord (2137) sits in the active end of that workload. For a home extension, the realistic clock from lodgement to DA determination is 8-14 weeks. The applications that move to the front of the queue are the ones where every required document is correctly named, drawn to scale, and matched against the SEPP or LEP clause it's claiming compliance with. Buildana lodges every project at that standard — not because it's required, but because it's how you avoid sitting in the RFI loop for an extra month.
Builder's Take on Concord
City of Canada Bay Council setback and height rules apply to the extension, not the whole house. An older Concord home that was built inside the setback might not be extendable to the boundary. We check that during feasibility so there's no expensive surprise at DA stage.
Timing on Concord extensions typically runs 14–24 weeks for ground-floor additions, 20–32 weeks for second-storey. Living in the house during the build is possible but requires staging — we plan around it so the kitchen and main bathroom aren't out at the same time.
Concord vs Nearby Suburbs
Concord vs nearby suburbs — key metrics for extending.
| Suburb | Median Price | Typical Lot | Soil Class | Era | Station |
|---|---|---|---|---|---|
| Concord2137this suburb | $2.2M–$4M | 500–900m² | Class M–H (Wianamatta Shale) / H (river/bay fall) | 1900s–1960s | Concord West (1 km) |
| Concord West2138 | $2.0M–$3.8M | 450–800m² | Class M–H (Wianamatta Shale) / H (river/bay fall) | 1900s–1960s + apartments | Concord West (in suburb) |
| Mortlake2137 | $1.9M–$3.5M | 400–800m² | Class M–H (Wianamatta Shale) / H (river/bay fall) | 1900s–1960s | North Strathfield (2 km) / Mortlake ferry to Putney |
| Cabarita2137 | $2.5M–$5M | 500–1,000m² | Class M–H (Wianamatta Shale) / H (river/bay fall) | 1900s–1940s | North Strathfield (2 km) |
Median price, soil class, and lot size shape build feasibility and final cost. Buildana assesses every site against these and other constraints during the free feasibility stage.
Have a question about your project?
Talk to our team — free site assessment and fixed-price quote.
Cost Guide
| Item | Estimated Range |
|---|---|
| Simple rear extension (single wall removal, no roof change) | $90,000 – $200,000 |
| Moderate extension (multiple openings, roof extended) | $200,000 – $380,000 |
| Complex extension (structural steel portals, re-roofing) | $380,000 – $600,000 |
| Second-storey tie-in (existing house re-engineered) | $350,000 – $650,000 |
Prices are indicative for Western Sydney (2025). Actual costs depend on site, specifications, and approvals.
How It Works
From First Call to Final Key
The first job on an extension is finding out what you're extending onto. Concord homes from the 1900s–1960s were built to different standards — we open walls, check footings, verify load paths. The existing house has to carry the new work.
⏱Design follows the existing roof. A bad extension looks like a bolt-on; a good one reads as original. Matched brickwork or contrasting render (whichever the architecture calls for), tied-in roofline, continuous flooring where it should be continuous.
⏱Construction happens while you live in the house. That means weatherproofing every night, staging the works so kitchens and bathrooms don't disappear on the same week, and keeping the site clean of debris that doesn't belong in a family home.
⏱Finish is seamless. Paint match, floor match, roofline match, brick match where possible. The only way to tell the extension is new is the date on the plans.
⏱Our Team
Oliver Alameri
Founder / Director / Builder · MPropDev · PhD Student
Ahmad Alameri
Accounts Manager
Claire Wendell
Project Manager
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Liverpool, NSW
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Last updated: 1 April 2026
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Extend, Don't Move — Concord
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