J2 is an engineering consultancy focused primarily on the delivery of building and industrial engineering services across all industries. For a list of services provided click here. For a list of industries we work in click here.

J2 Consulting Engineers has two directors James Alexander  and James Sunjaya.


J2 has offices in NSW (Sydney, Newcastle, Jindabyne), SA (Adelaide, Adelaide Hills, Kangaroo Island) and QLD (Brisbane) and are registered to work as consulting engineers throughout all regions of the country. Due to our company structure we are flexible and adaptable and are willing to consider any project opportunities around the country. If in doubt, just ask us and we will be able to tailor our services to suit your requirements.


Rather than using medium to large organisations offering mediocre service at a premium price, J2 was established to do the opposite; to offer quality documentation and solutions sensitive to the client’s needs within a reasonable timeframe and for a reasonable cost.

The company directors have extensive backgrounds in the fields of building, building certification and fire services design and thus the solutions adopted have a commercial reality and consider ‘buildabilty’ on site.

J2 understands that clients expect quality solutions, and designs reflective of these solutions. At J2 both James Sunjaya and James Alexander take ownership of projects and act as a single point of contact for all projects. The experience provided by J2 is a personal experience tailored to suit your specific project requirements. J2 consulting engineers recognise that the ‘one size fits all’ approach does not work for most clients and strive to offer optimum building solutions with the client’s requirements always at the front of mind.


J2 Consulting Engineers offer the following services:

Fire Safety Engineering

Our fire engineers are registered as building practitioners in NSW, QLD, VIC, TAS and NT with no current requirement for registration in SA and WA. We optimise performance based designs for our clients across the country and find workable and pragmatic design solutions without compromising of the life safety of building occupants. We can also undertake peer reviews, BCA Fire and Life Safety Reports and Fire and Life Safety Upgrade strategies for existing building.

Essential Services Maintenance Reviews

At J2 Consulting Engineers we understand that life safety typically relies upon the active and passive fire and life safety systems installed in the building. Due to the reliance on these systems, maximising system reliability through preventative maintenance is legislated by each state and territory. Our consulting services offer an opportunity to review and develop a more integrated, optimised and holistic approach for your preventative maintenance contracts. Contact our office if you require a review of your preventative maintenance contracts/systems to determine if there are any opportunities for improvement.

Building Services Design

J2 Consulting Engineers also has capabilities for building services design and specialises in delivery of design and construct documentation working with builders and contractors to deliver streamlined, cost effective and sustainable design solutions. Detailed design documentation can also be provided by our office and our approach can be tailored to suit client requirements.

Bushfire Design

Our office has experience in the design and construction of buildings in bushfire prone areas including undertaking Bushfire Attack Level (BAL) assessments, providing general building advice, fire suppression design and fire engineering alternative solutions.

James Sunjaya is also an operational firefighter with the SA Country Fire Service and ensures that design solutions adopted cater for both the operational requirements of attending firefighters whilst minimising visual impact and maximising asset protection against the threat of bushfire.

Access Consulting

Access to premises for all occupants is an important part of building design to ensure that compliance with the Disability Discrimination Act is achieved. Our office has accredited professionals which provide consulting advice and seeks to address alternative solutions where possible and relevant to each unique building scenario.

BCA Consulting

Both of our directors have a solid knowledge in BCA compliance with James Alexander accredited as an A1 accredited building certifier with the NSW Building Practitioner’s Board. Our office provides BCA compliance advice and can outline any deviations from the Deemed to Satisfy provisions of the BCA.


Contact Us

J Squared Engineering Pty. Ltd.

ACN: 605 793 986
ABN: 83 605 793 986

Website: www.jsquared.com.au
Email: info@jsquared.com.au

NSW Office: 02 6456 1285
SA Office: 08 8390 0462

Mailing Address:

NSW Office – Jindabyne
PO Box 169
Jindabyne, NSW 2627

SA Office
PO Box 146
Magill SA 5072

QLD Office
PO Box 5348
Stafford Heights QLD 4053

Office Locations:

NSW Office – Jindabyne
Shop 6 (First Floor)
Razorback Plaza
Jindabyne, NSW 2627

SA Office – Adelaide
27 Rundle Street
Kent Town, SA 5067

NSW Office – Sydney
Suite 10, Level 14
153 Macquarie Street
Parramatta, NSW 2150


Contact Us

J2 Consulting Engineers are always looking for the right people to join our growing team. If you are interested please submit your resume to info@jsquared.com.au.


Both James Alexander and James Sunjaya have a wealth of experience in the following fields:

  • Houses and Townhouses – Fire engineering for domestic developments in both the fields of fire engineering and design to suit bushfire requirements.
  • Apartments – Services design and fire engineering for apartment buildings ranging from low rise to high rise building in excess of 100m in height.
  • Hotels – Services design and fire engineering for medium and high rise hotel buildings including modular buildings constructed offsite and assembled onsite.
  • Offices – Services design and fire engineering for new office buildings and tenancy fitouts within existing building.
  • Retail – Services design and fire engineering for medium to large scale shopping centres ranging from between 3,000m2 and 50,000m2.
  • Carpark – Services design and fire engineering for low rise to multi-storey open deck and enclosed carpark including those accommodating car stackers and car lifts.
  • Warehouse – Services design and fire engineering for a range of different occupancies ranging from warehouses in excess of 50,000m2 to smaller warehouse with floor areas not exceeding 2,000m2.
  • Workshops/Factories – Services design and fire engineering for a series of different industries including the automotive industry, defence, solvent refinery/extraction plants, mining, wineries, food processing, glasshouses and the like.
  • Aged Care – Services design and fire engineering for single storey and multi-storey aged care buildings.
  • Hospitals – Services design and fire engineering for over 50 hospitals across the country.
  • Education – Services design and fire engineering for major university buildings and primary/secondary school education facilities across the country.
  • Special Hazards – Services design and fire engineering for special hazard occupancies including those associated with underground mining operations, solvent extraction plants, hazardous waste refineries, ethanol plants, flour/grain mills and the like.


James Alexander and James Sunjaya hold a series of accreditation between them including the following:

  • NSW accredited A1 unrestricted certifier – BDC002
  • NSW C10 accredited fire engineer – BDC1994
  • NSW Design and Building Practitioner – Fire Safety Engineering – DEP0000328
  • National Professional engineer registration in the fields of fire safety and building services – 12622
  • VIC Registered Professional Engineer in the field of fire safety – PE0003138
  • Registration as a Professional Engineer of Queensland (RPEQ) in the field of fire safety and electrical engineering – 12622
  • TAS BPB accreditation in the field of fire engineering and building services – CC6747

James Alexander has the following qualifications:

  • Masters of Fire Safety Engineering
  • Bachelor of Applied Science
  • Graduate Diploma in Building Surveying
  • Member of the Australian Institute of Building Surveying

James Sunjaya has the following qualifications:

  • Masters of Fire Safety Engineering
  • Bachelor in Electrical Engineering
  • Bachelor in Medical Science
  • Chartered Professional Engineer
  • Member of Engineers Australia
  • Member of Society of Fire Safety