Home Ventilation Costs in Ireland: What Should You Budget For?

If you are renovating or retrofitting your home, ventilation can be easy to overlook until condensation, mould, or stuffy rooms become a problem. Yet improving insulation and airtightness can reduce natural airflow, making a properly designed ventilation system more important.So, how much should you budget for home ventilation costs in Ireland? The answer depends on your property size, the system you choose, installation complexity, and whether you need whole-house or room-by-room ventilation.This guide explains the main costs to consider, compares different approaches, and shows where you can potentially reduce installation disruption without compromising indoor comfort.

There is no single price for ventilation because every property has different requirements. Before choosing a system, consider four main factors:

A basic extractor fan will generally cost less than a complete mechanical ventilation system. However, it only addresses ventilation in a particular room.

For homeowners carrying out a substantial renovation, home ventilation systems such as MVHR or decentralised heat recovery can provide a more comprehensive solution.

A larger home generally requires greater airflow capacity and, for a central system, more ductwork. A compact property or targeted retrofit may need only one or several room-based units.

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Installation costs can increase when walls, ceilings, or floors need to be opened to accommodate ductwork. This is why ventilation is often cheaper and easier to incorporate while renovation work is already underway.

An older home may have different ventilation requirements from a newly built, highly airtight property. The right system should be selected according to the building rather than simply choosing the cheapest equipment.

As a broad 2026 budgeting guide, whole-house MVHR installations can fall roughly within these ranges:

Property	Typical Installed Budget
2-bed apartment	€4,000–€7,000
3-bed semi-detached	€6,500–€9,000
4–5-bed detached	€9,000–€13,000
Large detached property	€13,000–€20,000+

These figures are indicative rather than fixed quotations. Property layout, ductwork, access, system specification, and labour can all affect the final cost.

For a retrofit, it is particularly useful to compare the cost of a complete ducted system against a decentralised solution before committing to major structural work.

Mechanical ventilation heat recovery (MVHR) is designed to continuously extract stale air while supplying fresh, filtered air. The system transfers heat from outgoing air to incoming air through a heat exchanger, reducing unnecessary ventilation heat loss.

A central MVHR installation typically includes:

• The main ventilation unit
• Supply and extract ductwork
• Air valves
• Filters
• Controls
• External intake and exhaust connections
• Installation and commissioning

Because it serves the whole property, installation can involve considerably more labour than a single-room system.

For a new build or major renovation where ceilings and walls are already accessible, however, installing ductwork can be much more practical.

Not every renovation requires whole-house MVHR.

If condensation or poor airflow is concentrated in specific rooms, a single-room heat recovery unit may be more appropriate. These decentralised systems can be installed through an external wall without requiring extensive ductwork throughout the property.

For example, imagine a homeowner renovating a 20-year-old house with persistent condensation in two bedrooms. Rather than opening ceilings across the property, targeted single-room units could address those areas while keeping disruption and installation work more manageable.

This approach can also allow homeowners to upgrade ventilation gradually, room by room.

Don’t budget only for the equipment. Your overall ventilation system installation cost may include:

• System equipment: The unit or units, filters, controls, and associated components.
• Installation: Labour, drilling, ductwork, and electrical work where required.
• Design and sizing: The system needs to provide appropriate airflow for the property and rooms being served.
• Commissioning: A properly installed system should be checked and adjusted to ensure it operates as intended.
• Future maintenance: Filters and other components may need periodic attention, so consider ongoing running and maintenance costs when comparing systems.

A cheaper quote is not necessarily better value if it does not include everything required to deliver effective ventilation.

The best time is usually before the renovation is finished. If walls or ceilings are already being opened, installing ductwork or electrical connections can be significantly easier than returning later and disturbing finished surfaces.

For example, if you are:

• Upgrading insulation
• Replacing windows
• Renovating bathrooms or kitchens
• Improving airtightness
• Converting an attic
• Extending your home

Include ventilation in the early design stage. This is especially relevant because improving airtightness without planning adequate ventilation can leave moisture and stale air trapped indoors.

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Start by identifying the actual ventilation problem. If only one bedroom has condensation, a whole-house system may not automatically be the most practical answer. If you are undertaking a major renovation and want consistent ventilation throughout an airtight home, whole-house MVHR may offer better long-term value.

Also compare systems based on:

• Heat recovery performance
• Airflow capacity
• Noise levels
• Filter requirements
• Installation disruption
• Controls and sensors
• Long-term running requirements

The cheapest installation is not necessarily the lowest-cost solution over its lifetime. A correctly specified system can help improve indoor air quality while reducing unnecessary heat loss.

For more background before choosing a system, explore our home ventilation guide and learn more about the different home ventilation systems available.

For homeowners investing heavily in insulation, windows, and heating efficiency, ventilation deserves a place in the renovation budget.

A well-designed system can continuously remove moisture, stale air, and indoor pollutants while supplying fresh air. Heat recovery systems can also recover a significant proportion of the heat contained in outgoing air. Ermen Systems’ ventilation solutions include both centralised and decentralised approaches, allowing the solution to be matched to the property and renovation requirements.

The right budget therefore depends less on finding the lowest price and more on choosing a ventilation approach that fits your home’s size, airtightness, layout and renovation plans.

Home ventilation costs in Ireland can range from a targeted retrofit investment to a substantial whole-house installation. The essential is to budget around your property’s actual needs, not simply the equipment price. For major renovations, plan ventilation early to reduce disruption and installation costs. For targeted problems, decentralised heat recovery can provide a practical alternative to extensive ductwork.

Ermen System can help you explore practical ventilation options for your renovation, from single-room heat recovery to whole-house solutions designed around comfort, indoor air quality and energy efficiency.