SEAI Grants for Home Ventilation: What You Can Claim in 2026

If you’re thinking about improving the ventilation in your home, you’ll want to know about SEAI grants. The Sustainable Energy Authority of Ireland (SEAI) provides funding to help Irish homeowners make their homes more energy-efficient — and mechanical ventilation with heat recovery is part of the picture.

This guide covers how ventilation fits into the SEAI grant landscape, how to make the most of available funding, and the practical steps to get started.

Important note: SEAI grant amounts and eligibility criteria are updated periodically. This guide reflects the general structure of available schemes as of early 2026. Always check seai.ie for the most current figures before making decisions. We’ll keep this guide updated as changes are announced.

The Quick Version

• SEAI provides grants for home energy upgrades including insulation, heating, windows, and ventilation
• Mechanical ventilation with heat recovery (MVHR/HRV) can be included in grant-funded upgrades
• Grants are most generous when you bundle multiple energy measures together
• You must use an SEAI-registered contractor and follow the correct application process
• Ventilation installed as part of a broader energy upgrade can significantly improve your BER rating

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Understanding the SEAI Grant Landscape

SEAI offers several schemes for home energy upgrades. Here’s how ventilation fits into each:

National Home Energy Upgrade Scheme

This is SEAI’s flagship programme for comprehensive home energy retrofits. It aims to bring homes to a BER rating of B2 or better, and typically covers:

• Wall insulation (cavity and external)
• Attic insulation
• Window and door upgrades
• Heating system upgrades (heat pumps)
• Ventilation systems
• Renewable energy systems

Under this scheme, ventilation is recognised as an essential part of a whole-house upgrade. When you insulate and seal a home, you need to address ventilation — and the grant covers it as part of the package.

Why this matters: If you’re already planning insulation or a heating upgrade, adding ventilation to the scope means it’s covered by the overall grant. This is often the most cost-effective way to get a ventilation system installed.

Individual Energy Upgrade Grants

SEAI also offers grants for individual measures — insulation, heating, solar panels, and more. The availability of standalone ventilation grants varies, so check the current schedule.

Even if ventilation isn’t listed as a standalone grant measure, it can still form part of a grant-funded upgrade when combined with other measures.

Better Energy Communities

Community-based energy upgrade programmes may also include ventilation as part of area-based retrofits. If your neighbourhood or housing estate is participating in a community energy scheme, ventilation could be part of the package.

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Why Ventilation Matters for Grants (and Your BER)

Here’s something many homeowners don’t realise: improving insulation without improving ventilation can actually create problems.

When you insulate your home, you make it more airtight. That’s great for heat retention, but it also traps moisture, CO2, and stale air inside. The result? Condensation on windows, mould on walls, and poor indoor air quality — exactly the problems we cover in our guides on condensation and mould.

SEAI and BER assessors know this. That’s why ventilation is increasingly part of the conversation around energy upgrades:

• BER assessors factor in the ventilation strategy when calculating your rating. Uncontrolled ventilation (like trickle vents) counts as heat loss. Controlled ventilation with heat recovery counts as a positive feature.
• SEAI one-stop-shops typically include a ventilation assessment as part of a whole-house retrofit plan.
• Building Regulations Part F requires adequate ventilation in all dwellings — and a proper mechanical system more than meets this requirement.

How ventilation affects your BER

Your BER rating is calculated based on the energy needed to heat, ventilate, and light your home. Here’s where ventilation makes a difference:

Ventilation Type	BER Impact
No ventilation (sealed home)	Doesn’t meet regulations
Trickle vents (open)	Counted as uncontrolled heat loss — negative impact
Extract-only fans	Some credit, but no heat recovery
Mechanical ventilation with heat recovery	Positive impact — reduces calculated heat demand

In simple terms: a home with good insulation AND heat recovery ventilation will achieve a better BER rating than the same home with good insulation and trickle vents.

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The Practical Process: How to Get a Ventilation Grant

Here’s the general process for including ventilation in an SEAI-funded energy upgrade:

Step 1: Get a BER assessment

Before any grant-funded work, you’ll need a BER assessment of your home as it currently stands. This establishes your starting point and identifies which upgrades will have the biggest impact.

A BER assessor will evaluate your insulation, heating, windows, and — importantly — your ventilation. If your home relies on trickle vents or has no mechanical ventilation, this will be noted.

Step 2: Choose your path

Option A: Full retrofit (National Home Energy Upgrade Scheme) Work with an SEAI-registered one-stop-shop to plan a comprehensive upgrade. They’ll design a package of measures to bring your home to B2 or better, including ventilation. The grant covers a significant portion of the total cost.

Option B: Individual measures Apply for individual grants for specific measures. If you’re adding insulation, consider adding ventilation at the same time — both for the grant potential and because it’s the right technical approach.

Option C: Install ventilation independently If you’re not ready for a full retrofit, you can install ventilation at your own cost. A single-room ERV like Optim Vent can be installed room by room without any other energy works. You won’t get a grant this way (unless ventilation is available as a standalone measure at the time), but you’ll solve your condensation and air quality problems immediately.

Step 3: Register and apply

For SEAI-funded work:

1. Register on the SEAI portal
2. Get quotes from SEAI-registered contractors
3. Apply for the grant before work begins (this is critical — work done before grant approval may not be covered)
4. Wait for grant approval
5. Have the work completed
6. Submit completion documentation
7. Receive your grant payment

Critical: Never start work before your grant is approved. SEAI will not retrospectively fund work that was done before application.

Step 4: Post-upgrade BER

After the upgrade, a new BER assessment confirms the improvement. This is your evidence of what the investment achieved — and it’s required for grant completion.

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Making the Most of Your Grant

Bundle ventilation with insulation

This is the most cost-effective approach. If you’re already getting insulation installed (especially external wall insulation), adding ventilation to the scope is straightforward and the grant covers it as part of the package. Plus, you’re solving the ventilation problem that insulation creates — before it starts.

Think room by room

Not every home needs whole-house MVHR with ductwork in the attic. Single-room ERV units can be installed exactly where they’re needed — bedrooms with condensation, bathrooms with mould, living rooms with poor air quality. This targeted approach can be more practical and cost-effective than a ducted system, especially in existing homes where running ductwork is disruptive.

Consider your BER target

If you’re aiming for a specific BER rating (for example, B2 to qualify for the National Home Energy Upgrade Scheme), mechanical ventilation with heat recovery can be the measure that gets you there. It’s often the “missing piece” for homes that have good insulation but are still losing their BER target due to uncontrolled ventilation losses.

Keep records

Document everything — the condition of your home before works (photos of condensation, mould), your BER certificates before and after, and all invoices and receipts. This protects you for grant claims and demonstrates the value of the work.

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What Optim Vent Costs to Run (And Why It Matters for Grants)

When calculating the payback period of a ventilation investment, the running cost matters:

• Optim Vent running cost: ~€10 per year (7.8W, 24/7 operation)
• Typical dehumidifier: €150+ per year
• Heat lost through open trickle vents: Varies, but contributes to higher heating bills
• Mould remediation: €300+ per room when needed

Even without a grant, the payback on a ventilation system is compelling. With a grant, it’s a no-brainer.

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Common Questions About SEAI Grants and Ventilation

I already have trickle vents — can I still get a grant for mechanical ventilation? Yes. Trickle vents don’t preclude you from installing mechanical ventilation. In fact, upgrading from trickle vents to MVHR/HRV is precisely the kind of improvement that SEAI schemes support.

I rent out my property — can I apply? Landlords may be eligible for SEAI grants on rental properties. There are specific requirements around property type and tenancy. Check the SEAI landlord eligibility criteria.

My house was built after 2011 — am I eligible? SEAI grants generally apply to homes built before a certain date. Newer homes may not qualify, as they should already meet modern building regulations. Check the current eligibility criteria on seai.ie.

Can I use Optim Energy as my contractor? We can install Optim Vent in your home and provide all documentation needed for grant applications. Get in touch to discuss your specific situation.

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Next Steps

1. Check your eligibility on seai.ie — look at both the National Home Energy Upgrade Scheme and individual grant measures
2. Get a BER assessment if you haven’t had one recently — this tells you your starting point and what upgrades will help most
3. Talk to us about ventilation. Whether you’re planning a full retrofit or just want to solve a condensation problem, we can advise on the right approach. Contact Optim Energy

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This guide is maintained as a reference and updated when SEAI grant amounts or eligibility criteria change. Last updated: February 2026. Always verify current figures at seai.ie before making financial decisions.

Are you a business? SEAI offers separate grant schemes for commercial energy upgrades. See our SEAI grants guide for Irish businesses for the complete 2026 overview including the Business Energy Upgrades Scheme, Accelerated Capital Allowance, and EXEED programme.