What DECMIL does

DECMIL is an Australian construction and engineering contractor founded in 1978 that delivers integrated, multi-disciplinary project solutions across the infrastructure, resources, and renewable energy sectors. Core capabilities span civil construction and bulk earthworks, non-process infrastructure for mining operations, accommodation villages, roads and bridges, airports, defence facilities, oil and gas infrastructure, and the civil and electrical balance-of-plant works for wind farms, solar farms, and battery energy storage systems. Contract structures range from lump sum fixed price and design-and-construct through cost reimbursable, schedule of rates, target resource estimate, and construct-only, with contract values spanning under $5 million to over $375 million (e.g., the Mordialloc Freeway at $375M, QGC wellsite installations exceeding $350M, and Sunraysia Solar Farm at $285M).

The company operates from headquarters in Perth with regional offices in Melbourne and Brisbane, delivering projects across all Australian states and territories as well as selective international sites in Papua New Guinea, Solomon Islands, Christmas Island, Tahiti, and Kenya. Revenue is generated primarily through competitive tenders and relationship-based enterprise sales targeting large mining companies (BHP, Rio Tinto, Samsung C&T, BMA, Covalent Lithium), energy producers (Chevron, QGC/Santos, Vestas, Tilt Renewables, Global Power Generation), and government infrastructure authorities (Major Road Projects Victoria, Department of Defence, Western Power). To pursue contracts beyond its standalone capacity, DECMIL regularly partners through joint ventures, notably with McConnell Dowell (Mordialloc Freeway, $375M), RJE Global (multiple wind farms), Balance Utility Group (Perenjori BESS), and the FAST JV with BHP.

Following the 2024 acquisition by Macmahon Holdings, DECMIL now operates as a wholly-owned subsidiary within the Macmahon Group, retaining its operational brand identity while delivering design, engineering, and construction solutions across its three core sectors. Its go-to-market relies on a project-based direct sales model supplemented by joint ventures, with no public pricing, software products, subscription offerings, or disclosed recurring revenue streams. The business is fundamentally a project delivery contractor whose revenue mechanics are tied to lumpy, multi-year, fixed-price and reimbursable contracts with major counterparties in resources, energy, and government infrastructure.

Name

DECMIL

Legal name

Decmil Group Ltd

Website

https://decmil.com

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

251–500 employees

Short description

DECMIL is an Australian construction and engineering contractor delivering integrated multi-disciplinary project solutions across infrastructure, resources, and renewable energy sectors for major mining, energy, and government clients. Since 2024 it operates as a wholly-owned subsidiary of Macmahon Holdings.

Ownership category

akta.pro rank

Product category

Construction and Engineering Services

NAICS

Utility System Construction (2371), Power and Communication Line and Related Structures Construction (237130), Commercial and Institutional Building Construction (236220)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600), General Bldg Contractors - Nonresidential Bldgs (1540)

akta.pro primary industry

Construction Management & General Contracting (EPCM, Scheduling, QA/QC, HSE) (EUAMAFAJ)

akta.pro secondary industries

Wind Farm EPC & Balance of Plant Construction (Civil, Electrical, Substations) (EUAMACAF), Overhead & Underground Collection System Construction (MV/HV Lines, Duct Banks) (EUAEADAG), Environmental & Permitting Compliance During Construction (Erosion Control, Wildlife Mitigation, Monitoring) (EUAMAFAM)

Keywords

• Construction engineering services
• Infrastructure project delivery
• Mining non-process infrastructure
• Renewable energy construction
• Accommodation village construction

Headquarters

HQ city

Perth

HQ country

Australia

HQ region

Oceania

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Marketing or Sales

Revenue model

1. Construction and Engineering Services: DECMIL generates revenue through project-based construction and engineering contracts. Contract types include design and construct, lump sum fixed price, cost reimbursable, schedule of rates, and construct-only engagements. Projects range from accommodation villages and civil works to non-process infrastructure and renewable energy installations, with contract values spanning millions to hundreds of millions of dollars.
2. EPCM Services: Engineering, Procurement, and Construction Management services where DECMIL manages delivery of complex multi-disciplinary projects on behalf of clients.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

DECMIL provides integrated construction and engineering solutions for the infrastructure, resources, and renewable energy sectors across Australia. Its offerings span design, engineering, procurement, construction, and commissioning (EPCM) of accommodation villages, civil works, non-process infrastructure, roads, bridges, airports, rail, defence facilities, oil and gas facilities, wind farms, solar farms, and battery energy storage systems. Contract types include design and construct, lump sum fixed price, cost reimbursable, schedule of rates, and construct-only engagements, with project values ranging from under $5 million to over $375 million.

Product overview

DECMIL provides integrated construction and engineering solutions as a single unified service offering across three core sectors: Infrastructure, Resources, and Renewable Energy. The company operates as a construction services provider rather than a software product company, structured around core competency areas including Accommodation Villages & Facilities, Airports, Building Construction, Civil Construction & Bulk Earthworks, Defence & Security, Non-Process Infrastructure (NPI), Oil & Gas, Rail, Roads & Bridges, Wind Farms, and Energy Storage. As a subsidiary of Macmahon Holdings, DECMIL delivers multi-disciplinary project execution combining civil, mechanical, electrical, and structural engineering capabilities. Projects range from accommodation camps and mining infrastructure to renewable energy facilities and road/bridge construction, with services spanning design, engineering, procurement, construction, and commissioning.

Differentiator

Problem solved

Functional benefit

Products and services

• Infrastructure Sector Construction Services Complex, multi-disciplinary project delivery for infrastructure sectors including roads, bridges, airports, and civil construction across Australia. Serves federal, state, and local government road authorities, transport departments, and infrastructure agencies.
• Resources Sector Construction Services Engineering and construction solutions for the resources sector, including mining infrastructure, non-process infrastructure, bulk earthworks, processing facilities, and accommodation villages for mining majors.
• Renewable Energy Sector Construction Services Design, engineering and construction solutions for renewable energy projects including wind farms, solar farms, and battery energy storage systems. Delivers civil and electrical balance of plant for wind farms and BESS installations.
• Accommodation Villages and Facilities Construction Construction of temporary and permanent accommodation villages for mining and resource operations, including central facilities, kitchens, recreation areas, and supporting infrastructure. Includes specialized units built to withstand blast overpressure and cyclone wind requirements.
• Civil Construction and Bulk Earthworks Large-scale earthworks, road construction, and civil infrastructure development including drill and blast, crushing and screening, bulk excavation, fill, and site preparation for mining and infrastructure projects.
• Roads and Bridges Construction Construction of roads, bridges, interchanges, and highway upgrades including duplication and safety improvement projects for government road authorities.
• Wind Farm Balance of Plant Construction Civil and electrical balance of plant works for wind farms including turbine foundations, access roads, electrical reticulation, and substation construction. Delivered through joint ventures with RJE Global and direct contracts with developers such as Vestas, Tilt Renewables, and Global Power Generation.
• Non-Process Infrastructure (NPI) Construction Design and construction of support facilities for mining operations including workshops, warehouses, administration buildings, fuel facilities, and water treatment plants.
• Oil and Gas Facility Construction Engineering and construction services for oil and gas facilities including LNG plants, metering stations, fuel storage, and pipeline infrastructure. Includes construction camp facilities, civil works, and non-process infrastructure for LNG operators.
• Defence and Security Facility Construction Construction services for defence facilities including training areas, fuel facilities, and security infrastructure for government clients including the Department of Defence.
• Building Construction Services Commercial and residential building construction services including offices, apartments, schools, and community facilities.
• Airport Infrastructure Construction Airport infrastructure construction including terminal buildings, runway upgrades, and aviation fuel facilities.
• Rail Infrastructure Construction Rail infrastructure construction including terminals, locomotive facilities, workshops, and rail-related civil works.
• Battery Energy Storage System (BESS) Construction Battery Energy Storage System (BESS) design, supply, installation and maintenance services for utility-scale storage applications.
• Engineering, Procurement, and Construction Management (EPCM) Services Engineering, Procurement, and Construction Management services where DECMIL manages delivery of complex multi-disciplinary projects on behalf of clients, combining design, engineering, procurement, construction, and commissioning capabilities.

Quantifiable outcome

• Delivered Yandin Wind Farm (214MW, 51 turbines) powering 200,000 households
• +3 more outcomes

Named customers12 records

Segments5 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

Six partnerships are on record, tiered flagship, core and minor.

• McConnell DowellflagshipStrategic or Co-development PartnerMcConnell Dowell and DECMIL formed a Joint Venture to deliver the Mordialloc Freeway Project worth $375M. This joint venture combined McConnell Dowell's major roads construction expertise with DECMIL's civil construction capabilities.
• RJE GlobalcoreStrategic or Co-development PartnerDECMIL and RJE Global formed a Joint Venture for multiple wind farm projects including Waddi Wind Farm and Ryan Corner Wind Farm. The JV combines DECMIL's civil construction expertise with RJE Global's electrical balance of plant capabilities.
• Balance Utility GroupminorStrategic or Co-development PartnerDECMIL and Balance Utility Group formed a joint venture to deliver the Perenjori Battery Energy Storage System (BESS) project for Western Power. The partnership combined DECMIL's construction capabilities with Balance Utility Group's utility expertise.
• BechtelminorImplementation/ SI/ Consulting PartnerBechtel served as EPCM (Engineering, Procurement, Construction Management) for the Wheatstone LNG Project where DECMIL delivered the Fly Camp and Pioneer Camp accommodation facilities.
• BHP Billiton Iron OrecoreStrategic or Co-development PartnerDECMIL operates under FAST JV (Fortescue Andrew Forrest Stream Technology Joint Venture) with BHP for Warrawandu Village. DECMIL has also completed multiple other projects for BHP including Mulla Mulla Village Expansion ($118M) and various non-process infrastructure works.
• Santos GLNGcoreStrategic or Co-development PartnerDECMIL completed Santos GLNG Roma Hub and Pipeline project work and has ongoing relationships through QGC for wellsite installation services worth over $350M, involving over 2,000 wellsites across the QCLNG project.

Scale indicators4 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• BMD Group: Privately held Australian civil infrastructure, urban development, and energy contractor. Direct competitor on roads, bulk earthworks, subdivisions, and utility construction across QLD, NSW, and VIC where Decmil operates.
• Fulton Hogan: Trans-Tasman civil contractor focused on transport infrastructure, utilities, and renewable energy construction. Comparable business model with strong presence in roads, bridges, and wind farm civil BoP — directly competing with Decmil's renewables/infrastructure work.
• John Holland: CIMIC-owned Australian Tier-1 contractor delivering rail, civil, building, and renewable energy projects. Direct competitor on roads, infrastructure, and integrated EPCM work with comparable multi-disciplinary capability and tier-1 client base.
• McConnell Dowell: Australian civil and marine infrastructure contractor that is both a JV partner with Decmil on Mordialloc Freeway and a direct competitor on roads, bridges, and pipeline projects across ANZ. Operates similar EPC and construct-only delivery models.
• Multiplex: Brookfield-owned Tier-1 Australian building and construction contractor. Overlaps with Decmil's nonresidential building and complex multi-disciplinary project work across commercial and institutional segments.
• Watpac Construction: BESIX-owned Australian contractor delivering commercial building, civil, and infrastructure projects. Comparable multi-disciplinary delivery model and similar tier-2 positioning competing with Decmil for nonresidential and infrastructure tenders.
• CPB Contractors: CIMIC subsidiary and one of Australia's largest infrastructure contractors. Direct competitor on large-scale road, rail, and renewable infrastructure tenders, with comparable JV-driven mega-project delivery model.

Broad incumbents

• Lendlease: Global diversified real estate and infrastructure group with significant Australian construction operations. Broader scope than Decmil but overlapping on large-scale building and infrastructure delivery.
• Downer EDI: ASX-listed Australian infrastructure group spanning transport, utilities, and energy services. Broader portfolio than Decmil but directly overlaps on road maintenance, rail, renewable EPC, and facilities management for major Australian clients.

Emerging players

• Sedgman: Sedgman (now part of CIMIC's CPB) specialises in mineral processing and non-process infrastructure design and construction for mining clients — closely comparable to Decmil's resources-sector NPI and village offering.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/decmilgroup
• LinkedInlinkedin.com/company/decmil-australia
• Instagraminstagram.com/decmil_group

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

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

M&A1 record

Investments

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

Frequently asked questions about DECMIL