For over 100 years Delap & Waller has been providing market leading engineering services for end-user Clients, Developers, Main Contractors and Design and Build / PPP Contractors. In addition to our tailored Mechanical & Electrical design services Delap & Waller offer a range of related services including Sustainability Services and specialist Legal Services.


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Delap & Waller deliver the design of Mechanical and Electrical Building Services for new build and refurbishment projects which comply with the latest energy regulations, are sustainable in design and operation, and are cost-effective.


Mechanical Design

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  • Ventilation and Air Conditioning
  • Water Services
  • Heating Services
  • Medical and Industrial Gases
  • Chilled Water


Electrical Design

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  • Lighting and Controls Systems
  • Fire Protection Systems
  • Security Systems
  • Information Technology Systems
  • Audio Visual Systems
  • Acoustics and Noise Control
  • Lift Installations
  • Telecommunications
  • Refrigeration
  • MV/LV Power Distribution Systems
  • Low Voltage Sub-Distribution Systems
  • Transformer/Generator Installations
  • UPS Installations


In addition to Mechanical & Electrical Building Services Design, Delap & Waller provide the following related engineering consultancy services:

  • Project management
  • Due Diligence Reports
  • BC(A)R Services
  • Opinions on Compliance

Delap & Waller aim to integrate Building Information Modelling (BIM) into all of our project processes within the three years. To view our ‘BIM Strategy for 2018’ please click here.



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By 2018 Delap & Waller aim to integrate Building Information Modelling (BIM) into all of our project processes. We are fully BIM ready in terms of policy, processes and compliance. Our engineers have the IT experience, software skills and the know-how of working in collaboration with a larger Design Team. Our trained engineers use Autodesk Revit to design 3D visualisations and models, which feed directly into the BIM interface.

We promote a collaborative culture at Delap & Waller and our BIM strategies have been developed with our customers and Design Team partners in mind to ensure maximum coordination. Delap & Waller can deliver significant improvements in cost, value, time and energy efficiency to our clients through active collaboration and the use of open sharable asset information.

We have been working on a number of commercial projects using BIM – some of which are now nearing completion.


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Delap & Waller has a number of qualified and experienced experts in areas of Arbitration, Insurance and Contract Litigation.

We have provided specialist Expert Witness services to a range of insurance companies, legal practitioners, financial institutions and private clients. As qualified engineers we can produce legal reports on a variety of issues ranging from mechanical or electrical damage to properties, planning permission disputes to accident reports. We have been called upon on numerous occasions to provide expert witness testimony at Mediations, Arbitrations and in Court Cases. Our aim in each of these circumstances is to provide factual, unbiased opinions that can be clearly understood by all parties involved.

Should you have a need for an Engineer to act as an expert witness for any technical situation, please contact Michael O’Doherty, who will be happy to discuss your legal requirements with you. Located in our Dublin office, Michael is a Chartered Engineer with 30 years experience in the Building Services Industry. He can be contacted directly on +353 1 5355900 and


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A balanced ethos in sustainable and social development is a key component in our holistic approach to low energy building designs.

We use passive building architecture, innovative system designs and renewable energy technologies. We cooperate with the overall Design Team to deliver buildings that are fit for purpose, economic to run and designed to exceed the expectations of the client.  Our designs enable the client to operate the building effectively, and enjoy the certainty that the technology selected for their servicing solution is socially, economically and environmentally sustainable.

As accredited low carbon designers we have developed our own in-house thermal modelling and simulation resource and continue to develop this through staff training and CPD. Low carbon technology is a vital part of modern design, but it is the act of making sure that real people can accept, understand and operate those technologies economically, that transforms good design into sustainable development. Working with the client and design team our specialists help to formulate passive ventilation strategies and conduct solar studies to create low energy buildings with fewer and smaller Building Services systems.

Some of the sustainable services we offer include:

  • BREEAM Assessments
  • BER Certificates
  • CFD Modelling / Building Simulation
  • Code for Sustainable Homes
  • Energy Management
  • Environmental Studies and Engineering
  • Life Cycle Costing
  • Sustainable Building Services – SBEM & EPC Assessors



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