Why Building Services Engineers Should Be Involved Before Planning Permission Is Submitted
- MTS DNC ENERGY CONSULTANTS LIMITED
- Jul 10
- 4 min read
For many years, obtaining planning permission in Ireland was largely considered an architectural exercise. Site layouts, building appearance, height restrictions and planning policies took centre stage, while the detailed mechanical and electrical (M&E) design was often left until after planning approval.
Today, that approach is becoming increasingly risky.
Although Irish planning legislation does not currently require a Building Services Engineer to sign a planning application, modern buildings are becoming far more dependent on mechanical and electrical systems. As a result, early engineering input is becoming essential for successful project delivery.
Whether you are designing a commercial building, apartment development, healthcare facility or industrial project, involving a Building Services Engineer during the planning stage can save significant time, money and redesign costs later.
🏗️ Why Has This Changed?
Modern buildings are no longer heated by a simple gas boiler hidden away in a plant room.
Today's developments often include:
Air source or ground source heat pumps
Mechanical ventilation systems
Solar photovoltaic (PV) panels
Battery energy storage
Electric vehicle charging
Rainwater harvesting systems
Building Management Systems (BMS)
Large electrical switchrooms
Sustainable drainage infrastructure
All of these systems require space, coordination and careful engineering design.
If they are not considered before planning permission is granted, accommodating them later can become extremely difficult.
⚡ Energy Performance Now Influences Planning
Ireland's commitment to reducing carbon emissions means that new developments must achieve increasingly demanding energy performance standards.
Planning authorities are now regularly requesting supporting documents such as:
Energy Statements
Sustainability Reports
Renewable Energy Strategies
Climate Action Reports
Although these documents may not contain detailed mechanical drawings, they rely heavily on engineering calculations.
Questions such as:
Where will the heat pumps be located?
Is there enough roof space for solar PV?
Can the electrical infrastructure support future demand?
Is sufficient plant space available?
all need answers long before construction begins.
🏢 Plant Rooms Can No Longer Be an Afterthought
One of the biggest reasons projects encounter delays is because insufficient space has been allocated for building services equipment.
Modern low-carbon buildings require considerably more plant than traditional developments.
Examples include:
Heat pumps
Hot water storage cylinders
Buffer vessels
Air Handling Units (AHUs)
Ventilation ductwork
Electrical substations
Water storage tanks
Battery storage systems
These items can influence:
Roof layouts
Building heights
External compounds
Service risers
Internal layouts
Trying to accommodate them after planning approval may require costly redesigns—or even revised planning permission.
🔌 Utility Capacity Is Becoming a Critical Design Issue
Obtaining planning permission is only one part of delivering a successful project.
Developments must also secure adequate infrastructure from utility providers.
Commercial projects often require early consideration of:
Electrical Maximum Import Capacity (MIC)
ESB Networks connections
Water supply requirements
Drainage capacity
Wastewater infrastructure
Without early engineering input, projects can receive planning approval but later experience significant delays while waiting for utility upgrades.
🌡️ Ventilation and Overheating Matter More Than Ever
Modern buildings are designed to be highly insulated and airtight.
While this reduces heating demand, it also increases the risk of overheating if ventilation and solar gains are not carefully managed.
Mechanical ventilation systems, glazing design and shading strategies should therefore be considered during the earliest stages of design.
This helps ensure the building is both energy efficient and comfortable throughout the year.
📐 Better Coordination Means Better Buildings
When architects and Building Services Engineers collaborate from the beginning, projects benefit from:
✔ Better use of available space
✔ Improved energy performance
✔ Fewer design clashes
✔ Reduced planning amendments
✔ Lower construction costs
✔ Easier Part L compliance
✔ Faster project delivery
Early coordination also helps create buildings that are easier to maintain, more sustainable and better prepared for future regulations.
🚀 The Direction of the Industry
There is currently no legislation stating that a Building Services Engineer must certify every planning application.
However, Ireland's transition towards:
Nearly Zero Energy Buildings (NZEB)
Zero-Emission Buildings (ZEB)
Electrification of heating
Renewable energy integration
Lower operational carbon emissions
is making mechanical and electrical engineering an increasingly important part of the planning process.
Rather than being driven by a single law, this change is happening because modern buildings simply cannot achieve today's energy performance standards without early engineering coordination.
In practice, what was once considered optional is quickly becoming an essential part of successful building design.
🏢 How Our Consultants Can Help
At MTS DNC Energy Consultants, we provide:
Heat pump assessments
Part L compliance reports
Building energy modelling
Through NEXUS M&E Design, we also deliver:
Heat loss calculations
Heat pump sizing
Radiator and underfloor heating design
Mechanical ventilation design
We ensure every system is designed for maximum efficiency, compliance, and long-term performance.
Heat pumps work differently. Rather than generating heat through combustion, they transfer heat from the outside environment into a building. By exploiting the vapour compression refrigeration cycle, heat pumps can deliver three to five times more heat energy than the electrical energy they consume, making them one of the most energy-efficient heating technologies available.
📍 Disclaimer
The content shared in these posts is intended for informational purposes only and should not be interpreted as design advice, specifications, or a calculation template. For professional guidance or design services, please contact us through our contact form.