Can we stay in our Kirrawee home during the extension?

Yes for most ground-floor extensions — we dust-protect the existing home, seal off the active work zone, and run utilities through. Second-storey additions are harder; you usually need to vacate 4–8 weeks during roof-off and frame stand. We plan the occupancy strategy at contract stage so you're not guessing week to week.

What structural considerations affect extensions in Kirrawee?

Kirrawee has Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage soil, which affects footing design for extensions. Connecting new footings to existing footings requires engineering design. For second-storey additions, the existing slab and frame must be assessed for load capacity. Buildana includes full structural engineering in every extension quote.

How does an extension affect my home insurance in Kirrawee?

Buildana's construction insurance (Builder's All Risk) covers the build phase. Once completed, notify your insurer of the additional floor area — your replacement value increases. Well-built extensions add to both insured value and market value in Kirrawee. Update your policy before the extension warranty period starts.

Can the extension have higher ceilings than the existing house in Kirrawee?

Yes — and it often makes the result feel intentional rather than tacked-on. Existing 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)-era homes in Kirrawee typically have 2.4m ceilings; extensions go to 2.7m or higher with raked or coffered detailing. The transition is usually marked by a step in ceiling height at the junction, which reads as a design feature rather than an awkward mismatch. Adds 2–4% to extension cost for the additional wall framing.

What if my Kirrawee home is in a heritage conservation area?

Heritage conservation areas (HCAs) require Sutherland Shire Council heritage assessment for any visible external changes. Rear extensions hidden from the street usually progress without issues. Front and side extensions need design that respects the streetscape — matching roof pitch, traditional materials, and complementary detailing. DA is mandatory (no CDC). Buildana works with heritage consultants on HCA properties — adds 4–8 weeks to approval but usually approves cleanly when designed properly.

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Home Extension Kirrawee — Design, Approval, Structural, Build

Q: Do I need a structural engineer for a home extension in Kirrawee?

Yes — any extension connecting to an existing structure needs engineering design. This covers new footings tied into existing slab, load transfer at junction points, lintel sizing for new openings, and roof structure modifications. Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage soil in Kirrawee means differential settlement between old and new sections must be managed. Engineering is included in every Buildana extension quote.

Q: What's the most popular type of extension in Kirrawee?

In Kirrawee, the most common extension is a rear ground-floor addition that opens up kitchen, dining, and living into one space — typically 30–50m² of new floor area. 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)-era homes here usually have separate rooms that don't connect well. A rear extension with sliding doors to the yard transforms how the house works day-to-day.

Full-service extensions in Kirrawee 2232: structural survey of existing 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore) home, design, Sutherland Shire Council approval, engineering, weatherproofed construction, matched finish to original dwelling.

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Quick Answer

A home extension in Kirrawee costs $150,000–$600,000+. Rear extension from $150K, second-storey addition from $300K. Buildana manages design, Sutherland Shire Council approvals, and construction under one fixed-price contract.

Extending Homes in Kirrawee

Kirrawee homeowners with 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)-era properties are increasingly turning to home extensions to gain space without the disruption of a full move. With typical lots of 550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai), most Kirrawee properties can accommodate ground-floor or second-storey extensions under Sutherland Shire Council's planning controls. Buildana manages feasibility, design, approvals, and construction for Kirrawee extension projects under one fixed-price contract.

Kirrawee's housing stock is mostly from the 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore), which is the era where structural bones either hold up or don't — and we see plenty of both across the suburb. For extending here, that history matters: asbestos survey before any demolition is non-negotiable, and licensed removal lands somewhere between $5,000 and $25,000 depending on what's actually there. Median price $1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside on typical 550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai) blocks. Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage ground, foundation cost band $45,000–$80,000.

Buildana manages the complete home extension process in Kirrawee — 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 Kirrawee from $150K
Sutherland Shire Council DA and CDC approvals managed
Ground floor, rear and second-storey additions
Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage soil — structural engineering included
1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)-era homes assessed for extension suitability
Connect new to existing — clean, matched finish
6-year structural warranty
Free design consultation — near Kirrawee station

Why Extend Your Home in Kirrawee?

Kirrawee is a station-precinct residential suburb with active R3/R4 medium-density development around the station — 1960s–1990s fibro and brick on the original streets, 2010s+ apartment towers around the station. R3 Medium Density supports duplex and townhouse on 550–800m² R2 lots elsewhere.

Kirrawee's mix of 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)-era housing on 550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai) blocks creates strong opportunity for property improvement. Median prices of $1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside support quality build investment. Kirrawee benefits from Kirrawee station on the doorstep — walkable rail access lifts both rental demand and property values. 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)-era homes in Kirrawee often have good structural foundations worth building on. Extensions add living space at a fraction of the full rebuild cost. Soil conditions in Kirrawee (Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage, extremely reactive) are factored into every Buildana foundation design.

Extensions in Sutherland Shire are dominant scope across most of the LGA given sandstone substructure complexity and BAL/Coastal Management/heritage controls that complicate KDR. Common scope: rear kitchen-living additions, second-storey additions on solid post-war footings, master suite wings, alfresco enclosures, foreshore deck/pool work. Sandstone rock excavation $20K–$80K on second-storey/footing-strengthening work. BAL-rated specs on Engadine/Heathcote/Bundeena/Menai/Bangor bushland-fringe extensions exceeding 50% original floor area. Coastal Management Act applies to extensions on Port Hacking/Burraneer Bay/Gunnamatta Bay foreshore — coastal hazard reports, NSW Crown Lands referral, restricted setback alteration. Heritage Conservation Areas in Cronulla beach village core, Sutherland CBD restrict scope on protected stock. Realistic budget $300K–$650K for 60–120m² inland; $500K–$1.4M premium foreshore with Coastal Management/sandstone/heritage layered. Pre-construction 4–8 months on standard sites; 9–14 months on Coastal Management/foreshore.

Home extension builder in Kirrawee — key facts

Suburb: Kirrawee, NSW 2232
Council / LGA: Sutherland Shire Council (Sutherland Shire)
Primary zoning: R2 Low Density predominant / R3 Medium Density on Cronulla/Caringbah/Miranda/Kirrawee/Sutherland/Engadine station precincts / E3/E4 Environmental on Royal NP fringe
Typical lot size: 550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai)
Soil class: Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage
Median house price: $1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside
Home era: 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)
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 Kirrawee — Local Context

Site & Ground Conditions in Kirrawee

Kirrawee sits on Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage soil — extremely reactive clay. For a home extension, that rules out the cheapest off-the-shelf slab designs straight away. and pushes engineered footings into the $45,000–$80,000 range on most 550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai) blocks here. Geotechnical testing isn't optional — every Buildana extension in Kirrawee 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 Kirrawee's topography can collect water against rear setbacks if the contour survey is sloppy.

What Sutherland Shire Council Wants to See

Approval in Kirrawee comes down to documentation quality. Sutherland Shire Council processes a high volume of residential applications, and the ones that get approved fast share three traits: clean drawings that show every required setback dimension on plan; a BASIX certificate that matches the actual specification (not a stand-in); and an engineering package sized correctly for the Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage ground. We prepare every document at full lodgement standard the first time.

Kirrawee Build Economics

Kirrawee sits in the $1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside price band, which is the framing for any home extension decision. On a 550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai) block here, the build-versus-buy maths usually favours extension when the existing slab and frame are sound and you only need 30–50% more floor area. Free Buildana feasibility runs the numbers against your actual block before any commitment.

What Makes a Extension Work in Kirrawee

Kirrawee (2232) is part of Sutherland Shire.. Building well here means understanding what the suburb actually rewards — and what it punishes. Reward: thoughtful orientation, family-scale outdoor entertaining, durable materials that look right against the 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore) streetscape, and floor plans that handle multi-generational living without feeling cramped. Punish: over-glazing on west elevations (summer heat is brutal), thin slab specs on Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage ground, generic project-home elevations that ignore the street rhythm. Buildana has built across Sutherland Shire long enough to know where the line sits.

Realistic Kirrawee Timeline

End-to-end timeline for a home extension in Kirrawee, lodgement-realistic: 8-14 weeks for DA, depending on neighbour notification and any RFI rounds. Add 2-3 weeks for documentation pack assembly before lodgement (BASIX, geotech for Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage, contour survey, hydraulic). Add 1 week for Construction Certificate post-approval. Construction runs 3-6 months depending on scope. Buildana provides a dated programme in every contract, not a vague "12-18 months" range.

Builder's Take on Kirrawee

Matching brick on a Kirrawee extension: 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore) brick is often discontinued. We specify a close-match or deliberately contrast with render or cladding so the extension reads as intentional, not as a failed match. Done well, an intentional contrast looks better than a forced match.

Extension or move? In Kirrawee, the maths usually favours extension once you factor in stamp duty ($40K–$60K), agent fees ($25K–$40K), and moving costs. An extension of $200K–$350K often delivers the space without the 12-week disruption of moving.

Kirrawee vs Nearby Suburbs

Kirrawee vs nearby suburbs — key metrics for extending.

Suburb	Median Price	Typical Lot	Soil Class	Era	Station
Kirrawee2232this suburb	$1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside	550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai)	Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage	1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)	Kirrawee
Sutherland2232	$1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside	550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai)	Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage	1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)	Sutherland
Gymea2227	$1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside	550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai)	Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage	1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)	Gymea
Miranda2228	$1.4M–$2.2M mid-tier; $1.8M–$3.8M foreshore; $2.5M–$6.0M+ Cronulla/Burraneer/Lilli Pilli/Caringbah South premium beachside	550–800m² typical; 600–1,000m² premium beachside/foreshore (Cronulla/Burraneer/Lilli Pilli/Yowie Bay/Caringbah South/Sylvania Waters); 700–2,000m² bushland-fringe (Bundeena, Maianbar, Bangor, Menai)	Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage	1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)	Miranda

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.

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Existing structure assessment — Kirrawee homes of the 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore)

Extension design (ground floor, first floor, or wrap-around)

Structural engineering for tied-in load paths

Geotechnical assessment (Class Hawkesbury Sandstone bedrock predominant (saw-cutting, rock-anchoring $30K–$120K above standard substructure) / Class P/E coastal alluvial on Cronulla/Kurnell sand bodies / coastal hazard + Coastal Management Act 2016 overlay on beachfront lots / Port Hacking foreshore building line on water-frontage soil — Kirrawee)

BASIX for the extended total envelope

Sutherland Shire Council DA or CDC lodgement

Temporary weatherproofing during build

Full construction — tie-in through to fit-out

Matching or contrasting external finishes

Final inspection and Occupation Certificate

How It Works

From First Call to Final Key

The first job on an extension is finding out what you're extending onto. Kirrawee homes from the 1960s–1990s fibro/brick veneer predominant + 1990s–2010s brick (Menai/Bangor/Illawong/Alfords Point) + 2010s+ premium contemporary (Cronulla beachside/foreshore) were built to different standards — we open walls, check footings, verify load paths. The existing house has to carry the new work.

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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.

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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.

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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.

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Quality Promise

Kirrawee home extension specialists: we work on your home while you live in it, weatherproof the site nightly, finish clean.

Fixed-price extension constructionNCC 2025 and BASIX compliantFull Sutherland Shire Council complianceMatched old-to-new connectionWeekly progress updates6-year structural warranty

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.

Our Team

Oliver Alameri

Founder / Director / Builder · MPropDev · PhD Student

Ahmad Alameri

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Claire Wendell

Project Manager

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Areas We Serve

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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.

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Last updated: 1 April 2026

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