back to listings SME Profile: Delap & Waller Ltd

Delap & Waller Ltd

12 Antrim Technology Park
Belfast Road
BT41 1QS

T:  +44 (0) 28 9448 3800  


London Office

91 Clapham Road

T:  +44 (0) 20 80597373 



About Us

Delap & Waller MEP Building Services Engineers was founded in 1911, and to this day we remain a leader in the field of MEP Building Services Engineering Consultancy.

We provide our market leading service across a range of developmental sectors including:



Residential/Mixed Use






Sports Stadiums


Our role is the design and specification of MEP Building Services in Buildings which underpin business operations and promote the following benefits:

  • Comfort
  • Energy Efficiency
  • Productivity
  • Compliance
  • Performance
  • Security

We employ 60 professional staff in 3 offices in Antrim, London and Dublin.

We retain Insurance Cover and Professional Indemnity cover at the highest levels in our marketplace.

Our extensive use of the latest technological tools and simulation software promote the performance and accuracy of our designs.



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.

Mechanical & Electrical

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

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

Electrical Design

  • 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.

Building Information Modelling

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.


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.


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



Delap & Waller with its long history in Ireland and the UK continues to play an influential role and to be a part of the activities of specialist organisations which promote our industry.

The Company/Staff are members of:

  • Chartered Institute of Building Services (CIBSE)
  • Association of Consulting Engineers (ACE)
  • Association of Consulting Engineers Ireland (ACEI)
  • Institute of Electrical Engineers (IEE)
  • Building Research Institute (BRE)
  • Institute of Electrical Engineers of Ireland (IEI)

Supplier Locator Free Text Search Area

To find the relevant supplier by company name, product or service, please use the free text search box provided below:

[ Search tip: Separate words with spaces ]