How Much Will a Deep Retrofit Cost in Ireland?

by | Mar 29, 2024


Are high energy bills at home leaving you cold? You’re not alone. In Ireland, there’s a buzz about transforming homes into cosy, energy-efficient havens through deep retrofitting. This isn’t just about minor updates; it’s a comprehensive easyone aimed at significantly reducing energy consumption and bills. But the big question is: what’s the price tag on such a transformation? Is it a daunting expense or a wise investment for your future? In this blog, we’ll break down the costs of deep retrofitting in Ireland in the simplest terms. Whether it’s adding insulation or upgrading your heating system, we’ll guide you through making your home warm and efficient, without the financial chill.

So, without any further ado, let’s get into it!

What is Deep Retrofit and Why Do We Need It?

Let’s talk about the basics first:

What’s Deep Retrofitting ?

Think of deep retrofitting like giving your home a full health check, followed by a fitness plan to get it into top shape. It’s not just a quick fix; it’s about making your home the best it can be for keeping warmth in and those pesky high energy bills down.

The Benefits

You might wonder why you’d go through all this trouble. Well, it’s about comfort, saving money in the long run, and doing your bit for the old environment. Plus, a well-done job can add a fair bit to the value of your home.

The Price Tag

The cost can vary a lot, depending on what your home needs. But don’t worry, we’ll help you get a handle on what to expect.

Grants and Helps

The good news is, you’re not alone in this. There are grants and schemes from the government that can help with the initial outlay. It’s worth looking into these before you start.

A Penny Saved

Investing in deep retrofitting is a bit like putting money in a savings account. The upfront costs might seem a bit challenging, but the savings on your energy bills over time will likely make it worth your while.

What Are the Key Components of Deep Retrofitting Cost Factors?

Now, let’s understand what are the key components that determine the cost of deep retrofitting in Ireland:


Adding insulation is like bundling your house up in a cosy blanket. Whether it’s your walls, roof, or floors, each area has its own price tag. Wall insulation, for example, can range from €20 to €50 per square metre, depending on the type you choose. Roof insulation might cost between €30 to €60 per square metre. It’s an upfront investment, but it’s where you’ll likely see significant savings on your heating bills, possibly reducing your energy costs by up to 30%.


Replacing old windows with double or triple-glazed ones can be a game-changer for keeping your home warm. The cost for new windows typically ranges from €500 to €1,200 per window, depending on size and quality. It’s not a small expense, but the comfort and energy savings you’ll gain, especially during those chilly Irish winters, make it a worthwhile investment.

Heating Systems

An outdated boiler can be comfortable but not very efficient. Upgrading to a modern, efficient heating system is crucial and can cost anywhere from €2,500 to €5,000, depending on the system you choose. While the initial outlay is significant, a new heating system can reduce your energy consumption by up to 20%, saving you money in the long run.

Renewable Energy

Investing in solar panels or heat pumps is like planting a seed for your home’s energy future. The initial setup for solar panels can range from €1,500 to €3,000 per kWp (kilowatt peak), with an average home installation typically around 3 kWp. Heat pumps can vary widely, from €6,000 to €12,000, including installation. While the upfront costs are notable, the long-term savings and available grants can make renewable energy a smart financial move.


Proper ventilation is key to maintaining a healthy indoor environment, especially after sealing up your home with insulation and new windows. A whole-house ventilation system might cost between €1,500 to €3,000. It’s a smaller piece of the retrofit puzzle but crucial for ensuring good air quality and preventing moisture problems.

Remember, these costs are estimates and can vary. It’s always best to get multiple quotes and consider available grants and incentives to help offset some of these expenses. Retrofitting your home is an investment not just in your property but in your comfort and the environment.

Detailed Cost Breakdown for My House Retrofit

To help understand the process, let’s break down the potential costs involved, giving you a clearer picture of what your investment might look like.

How Much Will a Deep Retrofit Cost in Ireland? 5

Example 1: A Standard 3-Bedroom Semi-Detached Home

  • Insulation (walls, attic, floor): €15,000 – €20,000
    • Walls: €9,000
    • Attic: €4,000
    • Floor: €3,000
  • Windows and Doors Upgrade: €8,000 – €12,000
    • Double or triple-glazed windows and insulated doors
  • Heating System Upgrade: €7,000 – €10,000
    • High-efficiency boiler or heat pump installation
  • Solar Panels Installation: €5,000 – €7,000
    • For a 3 kWp system
  • Ventilation System: €2,000 – €4,000
    • Installation of a heat recovery ventilation system
  • Additional Costs (planning, labour, unforeseen issues): €5,000 – €8,000

Total Estimated Cost: €37,000 – €61,000

Example 2: A Larger Detached Home

  • Insulation (walls, attic, floor): €20,000 – €30,000
    • More extensive coverage needed for detached properties
  • Windows and Doors Upgrade: €10,000 – €15,000
    • Larger surface area requiring more units
  • Heating System Upgrade: €10,000 – €15,000
  • Solar Panels Installation: €6,000 – €9,000
    • For a larger 4-5 kWp system to match higher energy needs
  • Ventilation System: €3,000 – €5,000
    • Advanced systems for larger spaces
  • Additional Costs (planning, labour, unforeseen issues): €6,000 – €10,000

Total Estimated Cost: €55,000 – €84,000

Remember, these are just estimates, and the actual costs can vary. Factors such as the specific condition of your home, the materials you choose, and the contractors you hire can all influence the final price. It’s always best to get detailed quotes from professionals before starting your project.

What Are the Property-Specific Factors Affecting Retrofit Costs?

When planning a deep retrofit, the cost can change a lot depending on a few key things about your home:

Size of your house

First, the size of your house matters. Retrofitting a small house might start around €20,000, while a larger home could cost over €40,000. 

Type of your house

The type of your house also affects the price. For example, insulating a detached house usually costs more than a semi-detached house because there are more outside walls to cover. 

Age of your house

The age of your house is important too. Older houses might need extra work, like fixing old wiring or plumbing, which could add another €5,000 to €10,000 to your project. 

Condition of your house

The condition of your house right now plays a big part as well. If your house is already in pretty good shape, you might spend less. 

Location of your house

Lastly, where you live can change the cost. If you’re in a remote area, you might have to pay a bit more for materials and workers to travel to you, possibly adding an extra €1,000 to €3,000 to your total cost.

What Are the Labour and Professional Services Costs?

Now, let’s have a look at how much you should be spending on labour and professional services cost: 

How Much Will a Deep Retrofit Cost in Ireland? 6

Labour cost:

The people who do the work on your retrofit can make up a big part of the cost. General builders or contractors might charge anywhere from €30 to €50 per hour. 

Plumber or electricians cost:

If you need specialists like plumbers or electricians, especially for things like installing a new heating system or solar panels, their rates can be higher, maybe around €40 to €60 per hour

Architect or engineer cost:

Hiring an architect or an engineer to make sure everything is done right and meets all the rules can add €2,000 to €5,000 to your project. 

Necessary permits and permission cost:

Getting the necessary permissions and plans can also cost a bit, usually around €500 to €1,000. 

Unexpected cost:

And it’s always smart to plan for unexpected things that might come up once the work starts. Setting aside an extra 10% of your total budget for surprises is a good idea.

When undertaking such a significant project, partnering with professionals like us at Coastal Homes can make all the difference. Our team is committed to providing transparent, detailed cost breakdowns and expert guidance every step of the way, ensuring your retrofit meets the highest standards without unnecessary expenses. 

What Are Regulatory and Compliance Costs?

Let’s not forget about the most important regulatory and compliance cost to ensure that your project completion should be as seamless as its starting:

Planning Permissions

Getting the green light for your retrofit might require planning permission, especially for significant alterations. This can cost anywhere from €200 to €500 in application fees, depending on your project’s scope.

Building Regulations

Ensuring your project complies with building regulations is essential. Hiring a certified inspector to check your retrofit could set you back €400 to €1,000, based on your home’s size and the retrofit’s complexity.

Energy Assessments

An energy assessment can pinpoint where your home needs improvement and help tailor your retrofit. Expect to pay between €150 and €300 for a professional assessment.

Architect or Engineer Fees

For extensive retrofits, you might need an architect or engineer to draft plans. These professional services can range from €2,000 to €5,000 or more, depending on the project’s intricacy.

Legal Fees

If your retrofit involves legal complexities like easements or rights of way, setting aside €500 to €1,000 for legal advice might be necessary.

How to Do Financial Planning for a Deep Retrofit in Ireland?

Here is the step by step process of planning your finances for getting deep retrofit in Ireland:

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Setting Your Budget

Determining your budget is the first step. A basic deep retrofit can start from around €20,000 for a smaller home, but it’s wise to have a margin for unforeseen expenses.

Savings and Loans

Consider using savings or securing a loan for your project. Some financial institutions offer “green” loans with favourable terms for energy-efficient home improvements.

Government Grants and Incentives

Take advantage of government grants and incentives, which can cover up to €5,000 of your retrofit costs for eligible improvements like insulation or renewable energy installations.

Phased Approach

If the total cost is overwhelming, consider a phased approach. Get benefit with the most impactful improvements first, such as insulation, which might cost between €5,000 and €10,000.

Emergency Fund

Always have a contingency fund for unexpected issues. An additional €2,000 to €3,000 can help manage surprises without compromising your project.

What Are the Government Grants and Incentives Available for Deep Retrofitting?

In Ireland, the government offer different grants and incentives for deep retrofitting: Let’s have a look at each of them thoroughly:

SEAI Grants

The Sustainable Energy Authority of Ireland (SEAI) offers a variety of grants to help cover some of the costs of making your home more energy-efficient. For instance, you could receive up to €4,000 towards insulating your attic and walls.

Heat Pump Systems

Considering installing a heat pump? There’s good news. The SEAI provides grants of approximately €3,500 to assist with the installation, making the transition to renewable energy more feasible.

Solar Panel Support

Interested in generating your own electricity? Grants for solar panels can help offset the cost. Homeowners might be eligible for up to €2,200, making solar energy a more attractive option for both your wallet and the environment.

Upgrade Incentives

For smaller upgrades, such as installing a new boiler or heating controls, there are also incentives available. You could save around €800 with these grants, easing the financial burden of your retrofit project.

Local Authority Support

Some local councils offer additional support or incentives, particularly for homes in conservation areas or for lower-income families. It’s worth exploring what might be available in your area.

What Are the Long-term Financial Benefits of Deep Retrofitting Your Home?

There are different economical, and environmental benefits of going solar. Here are the main benefits of deep retrofitting your home in Ireland:

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Energy Bill Savings

Post-retrofit, you might see a significant reduction in your energy bills. Imagine saving up to €600 a year; over a decade, that amounts to substantial savings of €6,000.

Increased Home Value

An energy-efficient home can also command a higher market value. Estimates suggest a potential increase of up to 10% in your home’s value. For a home valued at €250,000, that’s a possible €25,000 uplift.

Maintenance Costs

Upgraded systems and improvements might also lead to lower maintenance costs. The absence of frequent repairs could save you approximately €250 to €400 annually.


Energy prices are unpredictable, but retrofitting your home can offer some protection against future increases. By reducing your dependency on energy, you’re less vulnerable to price hikes.

Environmental Impact

The financial aspects are important, but the environmental benefits of retrofitting—such as a reduced carbon footprint—contribute to a healthier planet, a value beyond euros and cents.

How to Overcome Financial Barriers If You Have A Low Budget?

With our expert tips and strategies you can overcome all the financial barriers even if you are on a low budget. So, worry not! Let us help you with our smart solutions:

Savings and Budgeting

Setting aside a small amount each month can build a fund for your retrofit project. Even saving €50 to €100 regularly can make a big difference over time.

Green Loans

Some financial institutions offer “green loans” for eco-friendly home improvements, potentially featuring lower interest rates, making it more affordable to finance your project.

Phased Projects

Getting your home retrofitted in stages can make the project more manageable financially. Start with the most impactful changes, like insulation, which offer immediate benefits in comfort and energy savings.

DIY Where Possible

If you’re handy, taking on some of the work yourself can significantly reduce costs. Simple tasks like painting or minor installations might be within your skill set and can save on labour expenses.

Community Schemes

Engaging with local community schemes or group initiatives can provide additional support, from bulk-buying discounts to shared labour. Connecting with neighbours or local groups can uncover valuable resources and assistance.


To wrap it up, deep retrofitting is not just an expense but a smart investment in your home’s future, improving comfort, reducing energy bills, and increasing property value. Making your home energy-efficient with deep retrofitting is a wise choice. It’s not just about the money you pay now; it’s about making your home better to live in, saving money on energy in the future, and even increasing your home’s worth. Yes, figuring out all the costs and how to afford it might seem tricky at first. But once you understand the expenses and the help available, like grants, it becomes clearer how this can work in your favour.

Thinking about making your home cosy and energy-saving? Coastal Homes is here to help you every step of the way. Let’s make your dream home a reality and tackle those energy bills together. Contact Coastal Homes today, and let’s start making your home more energy-smart.


1. What is the average cost of a deep retrofit in Ireland?

The average cost can vary widely, typically ranging from €20,000 to over €40,000, depending on the size of your home and the extent of the retrofitting needed.

2. Are there any grants available to help with the cost of deep retrofitting in Ireland?

Yes, the Sustainable Energy Authority of Ireland (SEAI) offers various grants for homeowners looking to improve their home’s energy efficiency, which can significantly reduce the overall cost.

3. How much can I save on energy bills after a deep retrofit?

Savings can vary, but homeowners can expect to reduce their energy bills by up to 50% depending on the improvements made during the retrofit.

4. Does deep retrofitting increase home value in Ireland?

Yes, deep retrofitting can increase your home’s market value by improving energy efficiency and comfort, with some estimates suggesting a potential increase of up to 10%.

5. How long does a deep retrofit take to complete?

The duration of a deep retrofit project can vary, typically ranging from a few weeks to several months, depending on the project’s scope and complexity.

6. What are the key components of a deep retrofit?

Key components often include upgrading insulation, windows, heating systems, installing renewable energy sources, and improving ventilation.

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