What Winstone Aggregates does

Winstone Aggregates is a New Zealand quarrying and aggregates producer founded in 1864 and operating today as a wholly-owned division of Fletcher Building following its 1988 acquisition. The company operates the country's largest aggregates network: 11 extractive quarries, 2 joint venture quarries, 4 clean fill sites, 4 IANZ-accredited laboratories, and a fleet of 80 GPS-monitored bulk trucks distributed across seven regional transport depots. Core products span concrete aggregates (graded chips, premium all-passing series, concrete sand), roading aggregates (AT and General All Passing series, Hunua products, TNZ AP 40 M/4), pavement sealing chips (Grade 3 and Grade 5), drainage materials, sand, and sundry products including KiwiRail-spec ballast and brown rock. All products are produced to national specifications including NZS3121, NZS3104, TNZ M/4:2024, and KiwiRail Ballast Track Specification 140, with Environmental Product Declarations available for sand and aggregate lines.

The business serves four primary customer segments: the concrete and civil industry (contractors and construction companies), the roading industry (NZTA and roading contractors for state highways and motorways), the rail industry (KiwiRail for track ballast), and fill site customers (construction firms disposing of cleanfill for quarry rehabilitation). Revenue is generated through quote-based unit pricing (per tonne, cubic metre, or loose density) on aggregate product sales, transaction fees on transport and bulk cartage, fee-based IANZ laboratory testing services, and cleanfill/managed fill disposal fees. The company has supplied aggregates for iconic New Zealand infrastructure including the Auckland Harbour Bridge, Sky Tower, Waterview Tunnel, Newmarket Viaduct, and Transmission Gully. Sustainability commitments include Science Based Targets-verified 30% Scope 1 and Scope 2 emission reductions by 2030, a net-positive biodiversity commitment by 2030, and the BIRS biodiversity reporting framework deployed in partnership with Nature Positive.

Winstone is led by General Manager Amanda Croft and a senior leadership team with regional managers covering Northern, Central, and Lower North Island/Southern regions, alongside functional heads across commercial, environment, labs, sales, and people & performance. The company is regionally headquartered in Penrose, Auckland, with operating sites spanning Northland, Auckland, Waikato, Kāpiti Coast, Wellington, Christchurch, and Otago, employing 318+ staff across drivers, operators, technicians, and support functions. Distribution is conducted entirely through direct channels: ex-quarry pickup, the company's own bulk transport fleet dispatched via a real-time product availability portal, and a website-driven quote and credit-account workflow staffed by dedicated regional sales representatives.

Name

Winstone Aggregates

Legal name

Winstone Aggregates Limited

Website

https://winstoneaggregates.co.nz

Company type

Private

Founded year

1864

Operating status

Operating

Headcount range

251–500 employees

Short description

Winstone Aggregates is New Zealand's largest quarrying and aggregates producer, operating 11 quarries, 4 IANZ-accredited labs, and an 80-truck fleet as a division of Fletcher Building. It supplies concrete, roading, pavement, drainage, and rail aggregates to construction, infrastructure, and government clients nationwide.

Ownership category

akta.pro rank

Product category

Construction Aggregates

NAICS

Construction Sand and Gravel Mining (212321), Nonmetallic Mineral Mining and Quarrying (2123), Mining (except Oil and Gas) (212)

SIC

Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400), Wholesale-Lumber & Other Construction Materials (5030), Wholesale-Metals & Minerals (No Petroleum) (5050)

akta.pro primary industry

Construction Aggregates Mining & Processing (Sand, Gravel, Crushed Stone) (IMADAAAI)

akta.pro secondary industries

Sand & Gravel Extraction & Processing (IMAKAHAB), Aggregate Processing & Value-Added Products (Washing, Screening, Asphalt/Concrete Aggregates) (IMAKAHAH), Specialty Aggregates (Rail Ballast, Riprap/Armor Stone, Gabion Stone) (IMAKAHAJ)

Keywords

• Quarry aggregates
• Construction materials
• Roading aggregates
• Concrete aggregates
• Bulk cartage services

Headquarters

HQ city

Auckland

HQ country

New Zealand

HQ region

Oceania

Offices11 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Personnel, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Aggregate Product Sales: Sale of quarry products including concrete aggregates, roading materials, pavement products, drainage aggregates, sand products, and sundry items. Products sold ex-quarry with optional transport delivery. Unit pricing based on tonnage (TN), cubic meters (M3), or loose density (LD).
2. Transport and Bulk Cartage: Company-owned fleet of 80 bulk trucks providing transport services across New Zealand. Includes bulk alloy units for aggregate/sand/coal/grain, heavy-duty bisalloy rock units, and high productivity motor vehicles capable of 50+ tonne gross weight operations.
3. Laboratory Testing Services: Fee-based IANZ certified laboratory and field testing services for civil engineering, geotechnical and construction industries. Includes soil testing, aggregate testing, field testing, and geotechnical laboratory testing.
4. Cleanfill and Managed Fill Services: Cleanfill and managed fill site operations accepting materials for quarry rehabilitation, with acceptance controls and environmental monitoring.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Winstone Aggregates quarries, processes, and distributes aggregate materials including concrete aggregates, roading aggregates, sand, pavement sealing chips, and railway ballast across New Zealand. The company operates 11 extractive quarries and supplies products meeting national specifications (NZS3121, NZS3104, NZTA M/4:2024, Kiwirails Ballast Track Specification 140). It also provides related services including IANZ-accredited laboratory testing, bulk transport/cartage through its own GPS-monitored fleet of 80 trucks, and cleanfill/managed fill site operations.

Product overview

Winstone Aggregates is a quarrying and aggregates company operating as a division of Fletcher Building, providing a comprehensive portfolio of construction materials and related services across New Zealand. The product portfolio centers on concrete aggregates (Premium All Passing 7, Premium All Passing 5, Concrete Sand, various Graded Chips and Concrete Aggregates), roading aggregates (AT All Passing variants, General All Passing series, Hunua products, Road Metal, TNZ AP products), pavement sealing chips (Grade 3 and Grade 5), and sundry products including Ballast and Brown Rock. The company also offers related services including IANZ-accredited laboratory testing (soil, aggregate, roading, geotechnical testing), transport/bulk cartage with GPS-monitored fleet, and cleanfill/managed fill site operations. Products are produced to meet national standards including NZS3121, NZS3104, and NZTA specifications, with Environmental Product Declarations available for sand and aggregate products.

Differentiator

Problem solved

Functional benefit

Products and services

• Concrete Aggregates A range of high quality unweathered well graded rock products (Premium All Passing 7, Premium All Passing 5, Concrete Sand, Graded Chip 22-14, Concrete Aggregate 14-5, Concrete Aggregate 20-10, Graded Chip 14-8) generally used in concrete mixes or asphalt mixes for buildings, bridges, and structures.
• Roading Aggregates A range of basecourse and sub-basecourse aggregates (AT All Passing 40, AT All Passing 65, General All Passing series 20-150, Hunua 40, Hunua 65, Road Metal 65mm, TNZ AP 40 M/4) for roading contractors and government agencies meeting TNZ M/4:2024 and Auckland Transport standards.
• Pavement Sealing Chips Grade 3 and Grade 5 Sealing Chips - high quality unweathered uniformly graded rock used in chip sealing and asphalt mixes. Complies with TNZ M6-2019 specification.
• Ballast High quality unweathered rock generally used in railway lines. Conforms to Kiwirails Ballast Track Specification 140, tested by IANZ laboratories every 1000m3. Produced using latest technology crushers to create angular shape with hard corners and dimensions that interlock to inhibit track movement.
• Brown Rock Weathered rock generally used as bulk fill material with no specification.
• Laboratory Services IANZ-accredited laboratory and field testing services including soil, aggregate, roading, material, geotechnical and construction testing. Operates 4 independently accredited IANZ laboratories across New Zealand with approximately 30 experienced technical staff.
• Transport/Bulk Cartage Bulk transport and cartage services with a fleet of 80 modern truck and trailer units located across the country. Includes bulk alloy units, heavy-duty bisalloy rock units, and high productivity motor vehicles capable of 50+ tonne gross weight operations. Fitted with GPS for accurate dispatch and monitoring via Eroad Ehubo2.
• Cleanfill and Managed Fill Services Cleanfill and managed fill site operations accepting materials for quarry rehabilitation, with acceptance controls and environmental monitoring for safe material disposal.

Quantifiable outcome

• 3 million tonnes of aggregate extracted per year at Hunua Quarry alone
• +5 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Eleven partnerships are on record, tiered core, major and minor.

• Mt Rex Shipping LtdcoreStrategic or Co-development PartnerJoint operation extracting sand from Kaipara Harbour for over 25 years (Mt Rex over 70 years). Both hold resource consents in overlapping area with Mt Rex undertaking all extraction activities under both companies' consents. Jointly seeking 35-year consent renewal for 700,000m3/year extraction.
• Nature PositivemajorStrategic or Co-development PartnerPartnership with Nature Positive (global leaders in environmental governance and impact assessment) to design a robust framework for biodiversity enhancement, using Biodiversity Indicator & Reporting System (BIRS).
• Ngāti HauāmajorStrategic or Co-development PartnerCollaborative pest control initiative at Maungakawa Scenic Reserve, Waikato. Partnership blending mātauranga māori and western science for biodiversity restoration.
• Ngāti Toa RangatiramajorStrategic or Co-development PartnerStakeholder partnership in gecko translocation programme at Belmont Quarry and Mana Island restoration. Partnership ensuring cultural values are embedded in biodiversity initiatives.
• Taranaki Whānui ki te Upoko o te IkamajorStrategic or Co-development PartnerStakeholder partner in Ngahere gecko translocation to Mana Island, involved in post-release monitoring and conservation efforts.
• Department of Conservation (DOC)majorStrategic or Co-development PartnerDOC involved in gecko translocation programmes (Auckland Green gecko at Hunua, Ngahere gecko at Belmont/Mana Island), species monitoring, and conservation efforts. DOC clearance required before vegetation clearing at quarry sites.
• Wellington ZoomajorStrategic or Co-development PartnerWellington Zoo received and quarantined geckos from Belmont Quarry translocation before transfer to Mana Island. Part of the gecko relocation programme.
• Friends of Mana IslandminorStrategic or Co-development PartnerCommunity group partner in Ngahere gecko re-establishment on Mana Island and post-release monitoring.
• Pūkaha National Wildlife CentremajorStrategic or Co-development Partner900-hectare restored forest and breeding site. Winstone partnership with Natureland Wildlife Trust helping successfully rear and transfer nine Yellow-Crowned Kākāriki chicks to Pūkaha for wild reintroduction.
• Natureland Wildlife TrustmajorStrategic or Co-development PartnerPartnership helping successfully rear nine Yellow-Crowned Kākāriki chicks for transfer to Pūkaha National Wildlife Centre. Flagship species selected by Winstone employees.
• NIWA (National Institute of Water and Atmospheric Research)majorStrategic or Co-development PartnerNIWA has conducted annual coastal morphology monitoring and biological monitoring of seafloor every 6 years since 2007 for Kaipara Harbour sand extraction operation. 20 years of monitoring data concluding no adverse environmental effects.

Scale indicators10 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Atlas Concrete: New Zealand concrete and aggregate producer with plants across the country. Comparable as a domestic aggregate and concrete-materials supplier overlapping with Winstone's concrete-aggregate and ready-mix-customer value chain.
• Road Metals: New Zealand aggregate and roading-materials supplier operating quarries across multiple regions. Directly comparable as a domestic competitor quarrying and supplying roading aggregates, basecourse, and concrete aggregate products to the same NZTA and contractor customer base.
• Golden Bay Cement: Fletcher Building sister division producing cement in New Zealand and a direct downstream consumer of Winstone's aggregates. Comparable as a fellow Fletcher Building construction-materials business and a key customer for Winstone's cement-grade limestone and sand products.
• Isaac Construction: South Island NZ civil contractor and quarry operator producing aggregates for roading and infrastructure. Directly comparable as a regional vertically-integrated quarry and roading-aggregate supplier competing for similar South Island infrastructure contracts.
• Fulton Hogan: Major Australasian infrastructure contractor and aggregate/quarrying operator with significant New Zealand quarry footprint. Directly comparable as a vertically-integrated quarry-to-roadbase supplier serving NZTA and roading contractors in the same geographies as Winstone.
• Allied Concrete: New Zealand ready-mix concrete supplier operating batch plants across the country. Comparable as both a major customer for Winstone's concrete aggregates and a downstream competitor shaping end-customer demand for aggregate supply contracts in NZ.

Broad incumbents

• Holcim New Zealand: Subsidiary of global Holcim group producing cement, aggregates, and ready-mix concrete in New Zealand. Comparable as a broad-incumbent aggregate and concrete-materials producer overlapping with Winstone's concrete-aggregate and roading-aggregate product lines.
• Hanson Construction Materials: Heidelberg Materials subsidiary operating quarries and supplying aggregates, concrete, and asphalt across Australia and New Zealand. Comparable as a multinational broad-incumbent with overlapping aggregates, concrete-aggregate, and roading-aggregate offerings in the Australasian market.
• Boral Limited: Large Australasian construction-materials group producing aggregates, asphalt, and concrete. Comparable as a broad incumbent operating quarrying and aggregate-processing infrastructure across Australasia and competing for large infrastructure contracts in the same product categories as Winstone.

Emerging players

• Civil Quarries: New Zealand quarry operator supplying aggregates to civil contractors and infrastructure projects. Comparable as a domestic emerging quarrying peer competing for sub-contract aggregate supply opportunities within Winstone's served market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat7 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/winstone-aggregates

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles16 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Winstone Aggregates