•               Ambition to Innovate               Engineering Firm of the Year 2025               Great Place to Work Certified 2025

Built Environment

Complex M&E design, engineered to perform

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Data Centres

Mission-critical engineering, designed for low energy & resilience

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Decarbonisation Strategy & Design

Supporting the transition to zero-carbon energy and infrastructure

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Building Physics

Applying physics to optimise building comfort, energy, and performance

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Energy & Infrastructure

Engineering complex energy networks through advanced modelling

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Engineering Excellence Starts with People

what we do

A leading International Engineering & Sustainability Consultancy, delivering innovative solutions for global clients

  • Built Environment

    Intelligent mechanical and electrical engineering solutions

  • Energy & Infrastructure

    Decarbonisation solutions delivering measurable carbon reduction across the building lifecycle

  • Building Physics

    IN2 Engineering applies advanced building physics and environmental modelling to predict, analyse, and optimise indoor environments

  • Sustainability

    Sustainable building solutions that improve performance, and future-proof the built environment

  • Building Information Modelling (BIM)

    IN2's digital coordination brings clarity and confidence to building delivery

  • Aftercare

    Extending the life of existing buildings through audit, evaluation and analysis-led retrofit

We operate from offices across Ireland, the UK and Europe

  • Dublin

    Unit E&F Mountpleasant Business Centre, Mountpleasant Ave Upper, Ranelagh, Dublin D06 P5N8

  • London

    5 St John's Lane London EC1M 4BH

  • Berlin

    Stresemannstraße 123 Berlin BE, 10963

  • Madrid

    19, Calle del Guadiana, Madrid, Spain

  • Athlone

    Unit 11 Inish Carraig Business Centre Athlone N37 PN82

  • Belfast

    2nd Floor, 5-23 Hill Street Belfast BT1 2LA

We bring expertise across many sectors to create building solutions that work for people in every space.

  • +

    employees working toward creating innovative, sustainable, and people-centred engineering solutions

  • building projects completed to date since IN2 Engineering's launch in 2002

  • k

    residential units in design and delivery

  • k

    m² innovative and sustainable office space design

  • hotel room keys delivered to date

  • %

    average project carbon reduction by 2030

Recent Projects

All projects

Trusted by Industry Leaders

  • Dublin Airport
  • EPIC - The Irish Emigration Museum
  • RA - Royal Academy of Arts

Here's what our people say.

IN2 was named Engineering Firm of the Year 2025 and a Best workplace by Great Places to Work 2026. Interested in joining us in 2026? View our vacancies, or join the IN2 Academy.

I joined IN2 as a graduate in 2019, and over the years I’ve had the opportunity to grow into a management role. That journey has been supported every step of the way, with encouragement to take on new challenges and develop at a pace that felt right for me.

Lucy-Marnée Henning

Bid Manager

IN2 is for engineers who refuse to be ordinary.