What Is the Best Insulation for a House in Ireland?

by | Mar 28, 2024


Finding the right insulation for your home in Ireland can seem hard because of the cold, wet winters and mild summers. It’s important to pick the right type to keep your home warm and save money on energy. 

Good insulation keeps your house warm and cuts down on heating bills. There are many types of insulation, so it’s key to look at each one’s benefits, like how well they keep heat in and how they handle moisture. 

This guide is here to help you figure out the best insulation for homes in Ireland, giving you clear, simple advice. We’ll make sure you have all the information you need to make your home cosy and energy-smart. So, let’s get started.

What Are the Different Types of Home Insulation?

Finding the best insulation for your home in Ireland involves considering the specific needs of your property and how you use it. Insulating your home effectively is key to reducing heat loss, and there are several types of insulation tailored for various parts of your house, including walls, attics, and floors. Whether the area you’re targeting requires solid or liquid insulating materials, the right choice can significantly impact your home’s warmth and energy efficiency.

  • Attic Insulation: is essential for minimising heat loss through the roof, which is a common issue in many homes.
  • Cavity Insulation: Perfect for homes with cavity walls, utilising insulating material injected into the gap between the inner and outer wall layers.
  • External Wall Insulation: This applies insulation material to the exterior of your home, enhancing thermal performance without affecting indoor space.
  • Internal Wall Insulation: Offers a solution for insulating the inside walls, especially useful when external insulation is not feasible.
  • Floor Insulation: is important for stopping heat loss through floors, particularly in older houses or those with accessible underfloor areas.

Each insulation type brings its own advantages and is suited for different scenarios and budgets. Understanding your options is the first step towards a warmer, more energy-efficient home in Ireland’s unique climate.

Why Attic Insulation Is Best for Your Home

Attic insulation is a top choice for keeping your home warm. Here’s why it’s great for your house:

Saves Money: First, insulating your attic helps cut down on heating bills. By keeping the heat inside, you don’t have to spend as much on energy to stay warm.

Stays Warm in Winter: The attic is where most of your home’s heat can escape. Adding insulation there means you keep more warmth inside during cold months.

Cool in Summer: Not only does it keep your home warm in winter, but attic insulation also helps keep your home cool in summer by blocking out the heat.

When is it Best to Use Attic Insulation? 

Using attic insulation is a smart way to improve your home’s comfort and energy efficiency. Here are some ideal situations when you should consider it:

When building a new home 

Starting fresh? This is the best time to add insulation. Doing it now means your home will be energy-efficient from the start. You’ll save on heating and cooling costs right away.

During renovations

If you’re fixing up your home, don’t miss the chance to add or upgrade your attic insulation. It’s an easy add-on when you’re already making changes. It can really boost your home’s energy savings.

After spotting high energy bills

Are your energy bills going up? Your attic might be the reason. Adding insulation there can cut these costs. Many people see their bills drop after insulating their attics.

If your home feels too hot or too cold

Does your home feel chilly in winter or too warm in summer? Your attic’s insulation might not be enough. Adding more can help keep your home comfy all year round.

When you hear a lot of outside noise

Insulation doesn’t just keep your home warm or cool; it can also make it quieter. If outside noise bothers you, consider adding insulation to your attic. It’s great for peace and quiet.

To increase your home’s value

Thinking of selling your home? Good attic insulation can make your home more appealing to buyers. It shows that your home is well-cared for and energy-efficient.

Types Of Attic Insulation 

There are different kinds of attic insulation, each with its own benefits:

Rolls and Batts: These are long sheets of insulation that can be laid down in your attic. They’re easy to put in and work well for many homes.

Loose-fill: This type is blown into place with a special machine. It’s good for getting into small spaces and covering the attic floor evenly.

Spray Foam: Spray foam expands to fill up spaces, making a tight seal. It’s excellent for stopping air leaks but is usually more expensive.

It’s Easy to add 

Adding insulation to your attic is often easier and cheaper than other home improvements. Many people can do it themselves, making it a great first project for saving energy.

Long-lasting benefits

Once it’s in, attic insulation works for many years. You’ll enjoy lower bills and a more comfortable home for a long time without having to do much to it.

In short, attic insulation is a smart choice for almost any home. It saves money, makes your house more comfortable, and is not too hard to add. Choosing the right type for your home can make a big difference.

Why Cavity Insulation Is Best for Your Home

Cavity insulation is great for saving energy and keeping your home comfortable. It fills the gap between your home’s outer and inner walls. Here’s why it’s a smart choice:

Lowers Bills: The main win is that it helps lower your energy bills. By trapping heat, your home stays warm without needing as much heating.

Better Comfort: It makes your home more comfortable year-round. In winter, it keeps the cold out and the warmth in. In summer, it does the opposite, keeping your home cooler.

Quick Installation: Putting cavity insulation in is usually quick. Professionals can do it without needing to make big changes to your home.

When is it Best to Add Cavity Insulation in Ireland?

In Ireland, using cavity insulation can be a great move to make your home more snug and energy-efficient. Here are the best times to think about getting it done:

When building a new home

If you’re building a new home, now is the perfect time to install cavity insulation. This way, your home starts off cosy and energy-saving from day one.

During home renovations

Got renovations planned? This is a great chance to add or improve your cavity insulation. It’s easier to do when you’re already making changes to your home. It can really help in lowering your heating costs.

If your home feels draughty or cold

Is your home not staying warm, especially during those chilly Irish winters? It might be time to look at your cavity insulation. Upgrading it can help keep your home warm and toasty.

When energy bills are high

Notice your energy bills creeping up? Your home’s insulation might need a boost. Better insulation in the cavities of your walls can reduce these costs significantly.

Before selling your home

Thinking of selling? Good insulation can make your home more attractive to buyers. It shows that the house is well-kept and efficient in using energy.

To improve your home’s energy rating

A good energy rating can make a big difference to your home’s value and appeal. Upgrading your cavity insulation can improve this rating. It’s a smart way to invest in your home.

Types of cavity insulation

There are a few types of materials that can be used for cavity insulation:

Foam Insulation: This type is sprayed into the cavity, where it expands and sets. It’s very effective at stopping heat from escaping.

Bead Insulation: Tiny beads are blown into the cavity. They pack together well, providing good insulation without any gaps.

Fibre Insulation: Materials like wool or fibreglass can also be used. They’re blown into the space, filling it up and stopping heat loss.

Why it works well

The gap in the walls of your home can let out a lot of heat. Filling this gap keeps your home warmer without needing to use extra heat. This is why cavity insulation is a simple way to boost your home’s energy efficiency.

It lasts a long time

Once installed, cavity insulation keeps working for years.It’s designed to last for the life of your building, which often means it can be effective for over 40 years. Properly installed, high-quality cavity insulation will continue to perform at a high level without needing replacement, making it a wise choice for long-term savings and comfort. It’s a one-time investment that pays off with lower energy bills and a more comfortable home for a long time.

Why External Wall Insulation Is Best for Your Home

External wall insulation wraps your home in warmth. It’s like putting a cosy jacket around your house. This is why it’s a top pick:

Saves Energy: It’s great for keeping heat inside your home. This means you use less energy to stay warm, which lowers your bills.

Boosts Home Look: Besides keeping you warm, it can also make your home look better from the outside. You get new finishes and colours to choose from.

Reduces Noise: It’s not just about warmth. This insulation can also make your home quieter by blocking outside noise.

When is it Best to Use External Wall Insulation?

External wall insulation is good to use when:

  • A house gets too cold or too hot because it doesn’t keep heat in or out very well. Adding insulation on the outside walls can help keep the temperature inside more comfortable.
  • A house has walls made of one solid layer. Some older houses are built this way, and they can’t easily have insulation added inside the walls. So, putting insulation on the outside is a good fix.
  • You want to make the outside of your house look better. If you’re fixing up the outside anyway, it’s a great time to add insulation.
  • You don’t want to make rooms smaller. Since the insulation goes on the outside, you won’t lose any space inside your house.
  • It helps keep your house warmer in winter and cooler in summer without letting heat escape or enter through weak spots in the walls.
  • It can help stop walls from getting too cold on the inside, which can make your house damp or mouldy.
  • It makes your house quieter by blocking out noise from outside.
  • It can make your house worth more because it’s better at saving energy, looks nicer, and is more comfortable to live in.

 Types of External Wall Insulation

  • Expanded Polystyrene Boards (EPS): Lightweight and effective, these boards are widely used for their good insulation properties.
  • Mineral Wool: Made from natural or synthetic fibres, it offers excellent thermal and sound insulation, and is also fire-resistant.
  • Polyurethane Foam (PU): Known for its high insulation value, it’s applied as a spray that expands and hardens, providing an airtight seal.
  • Phenolic Foam: Offers high thermal efficiency with a thinner profile, making it suitable for areas where space is limited.
  • Wood Fiber: An eco-friendly option made from natural wood fibres, providing good insulation and breathability to the building structure.
  • Cork Panels: Another green choice, cork is naturally insulating, moisture-resistant, and provides a unique aesthetic.

It boost home comfort & save energy 

Putting external wall insulation on your home involves covering the outside walls with insulating materials and then adding a protective layer over it. This layer can be finished in different styles and colours.

Quick and no mess inside

One big plus is that all the work happens outside. You don’t have to worry about the mess inside your home. And, you can still live there while the work is done.

It lasts a long time

Once it’s on, external wall insulation works for many years. Typically, it can last for over 25 years. It’s a long-term way to save money and make your home more comfortable.

Good for all seasons

This insulation keeps your home warm in winter and cool in summer. It’s a year-round benefit that makes your home a nicer place to be.

Why Internal Wall Insulation is Great for Your Home?

Internal wall insulation is a smart way to keep your home cosy. It works by adding insulation to the inside walls of your house. Here are the main benefits:

Keeps Heat in: It’s really good at stopping heat from escaping. This means your home stays warm with less heating, saving you money.

Fits Any Home: It’s perfect for homes where you can’t add insulation on the outside. You can use it in any room.

Improves Your Walls: Besides keeping you warm, it can make your walls look new again. You get fresh walls with better insulation.

When is it Best to Do Internal Wall Insulation?

External wall insulation is best done under certain conditions to improve a home’s comfort and energy efficiency. Here are some ideal times to consider it:

During renovations

If you’re already fixing up the outside of your house, it’s a great time to add external insulation. This way, you can improve both the look and the energy efficiency of your home at the same time.

In older homes

Older homes, especially those with solid walls (walls without a gap in the middle), can benefit a lot from external insulation. These homes weren’t built with today’s insulation standards and can be quite draughty and cold.

When interior space is precious

Since the insulation is added to the outside of your walls, you won’t lose any room inside. This is a big plus if you don’t want to make your rooms smaller.

If you want to reduce noise

Adding insulation on the outside walls can also help keep your home quieter by blocking out noise from the street or neighbours.

To lower energy bills

If you notice your heating or cooling costs are high because your home isn’t keeping warm or cool air in very well, external wall insulation can help make your home more energy-efficient.

To Improve home comfort

 Besides saving on bills, insulation makes your home more comfortable by keeping the temperature more stable, so it’s not too hot in the summer or too cold in the winter.

To tackle damp and mould problems

 If you have issues with damp or mould inside, insulating the outside can help. It keeps the walls warmer, which reduces the chance of dampness.

Before you sell

 If you’re thinking about selling your home, adding external insulation can make it more attractive to buyers. It looks better, is more comfortable, and promises lower energy bills.

Types of Internal Wall Insulation

  • Rigid Foam Boards: These are dense panels made from materials like polystyrene or polyurethane, known for their high insulation values and moisture resistance.
  • Mineral Wool Insulation: This type consists of fibrous materials made from rock or recycled slag from steel mills, offering excellent thermal and sound insulation.
  • Flexible Insulation Rolls or Batts: Typically made from fibreglass or mineral wool, these are easy to install between wall studs, and are suitable for various wall cavities.
  • Reflective Insulation: Utilises reflective surfaces, often aluminium foil, to reduce heat transfer, making it effective in preventing heat loss or gain.
  • Polystyrene Beads or Granules: Used in dry lining, these small beads can be injected into cavity walls, providing good insulation without major disruption to the wall structure.
  • Natural Fibre Insulation: Made from materials like sheep’s wool, cotton, or hemp, these options offer a more sustainable and eco-friendly approach to internal wall insulation.

How does it work?

To add internal wall insulation, materials are fixed to the inside of your external walls. Then, these are covered with plasterboard. You can paint or wallpaper over it just like any other wall.

It keeps up your home’s exterior look

A big plus is that your home’s exterior doesn’t change. This is important in areas where buildings have to look a certain way.

Quick to Install

Adding this insulation can be a quick way to update your home’s insulation without big construction. It’s a good choice for making older homes warmer.

Warm and quiet

Not only does it keep your home warm, but it can also make it quieter by blocking out noise from outside.

Why Floor Insulation Is Great for Your Home

Floor insulation is a key step in making your home feel warmer and more comfortable. It goes under the floors of your house. Here’s why it’s a smart choice:

Stops Cold Air: One big benefit is it stops cold air from coming through the floor. This means fewer chilly spots around your home.

Saves You Money: By keeping more heat inside, your home stays warm for longer. This can lower your heating bills because you don’t need to use as much energy.

Makes Floors Feel Warmer: In winter, floors without insulation can feel very cold. Insulating them means your feet will feel warmer, making your whole home cosier.

Types of Floor Insulation

You can insulate different types of floors, and the best method depends on what your floors are made of:

  • Solid Floors: Insulation boards can be laid on top, then covered with a new floor surface.
  • Suspended Floors: Insulating material can be placed between the floor joists underneath the floorboards.

When is it Best to Add Floor Insulation?

Adding insulation to your floors can make a big difference in how comfy your home feels. Here are the best times to think about putting it in:

When building a new home

Building a new home is the perfect time to add floor insulation. It’s much easier to put it in now than to add it later. This way, your home starts off cosy and energy-efficient.

During big renovations

If you’re already fixing up your home, it’s a smart move to add floor insulation. It’s a chance to make your home warmer and cut down on energy bills, especially if you’re working on the floors or basement.

If your floors feel cold

Do your feet get chilly when you walk around your home? This is a sign you might need floor insulation. Adding it can make your floors warmer to walk on, especially in winter.

In homes without basements

Homes without basements can lose a lot of heat through the floor. If your home is like this, insulating the floors can really help keep the heat in. It’s a good way to make your home feel warmer.

If you want to save energy

Want to cut down on how much energy you use? Floor insulation can help. It keeps your home warmer in the winter and cooler in the summer, so you don’t have to use as much heating or air conditioning.

To reduce noise

Insulation doesn’t just keep your home warm; it can also make it quieter. If you hear a lot of noise from under your home, adding insulation can help reduce this noise.

It’s Easy to add

Adding insulation to your floors can be easier than you think. Sometimes, it can be done without having to remove the entire floor, especially with suspended floors.

It lasts a long time

Once it’s in place, floor insulation keeps working for years. It can effectively last for up to 40 years or more. You’ll enjoy a warmer home and lower energy costs for a long time without needing to replace it.

Good for your whole home

Besides making floors warmer, this insulation helps keep the whole house warm. It’s an important part of making sure your home is cosy from top to bottom.

In short, floor insulation is a wise investment for any homeowner. It not only makes your floors and home warmer but also helps cut energy costs. Considering floor insulation is a great step towards a more comfortable and efficient home.


Choosing the right insulation for your home in Ireland—whether it’s for the attic, cavity walls, external walls, internal walls, or floors—is essential for enhancing comfort, reducing energy costs, and creating a more sustainable living environment. Each type of insulation offers unique benefits, from saving money to improving thermal efficiency. 

Understanding your home’s specific needs is key to selecting the best insulation solution. If you’re looking for expert advice and top-notch insulation services, Coastal Homes is here to help. Trust us to make your home warmer, more energy-efficient, and more comfortable. Contact Coastal Homes today to ensure your home is properly insulated for the Irish climate.


1. What is the most effective type of insulation for Irish homes?

The most effective type of insulation depends on your home’s specific needs, but attic and cavity wall insulations are widely recommended for their efficiency in the Irish climate. They are great at keeping heat in and are suitable for most homes.

2. How much does it cost to insulate a house in Ireland?

The cost varies depending on the type and extent of insulation. For example, attic insulation may cost a few thousand euros, while external wall insulation can be more expensive. Always get several quotes to find the best deal.

3. Can insulation help reduce my energy bills?

Yes, insulation plays a crucial role in reducing energy bills by keeping your home warmer in the winter and cooler in the summer, leading to less reliance on heating and cooling systems.

4. Is it possible to over-insulate my home?

While it’s rare, over-insulation can lead to diminished returns and potentially issues with ventilation. It’s important to follow recommended insulation levels and ensure your home is well-ventilated.

5. How long does home insulation last?

Most types of insulation can last up to 40 years or more if installed correctly and undamaged by external factors like moisture. Regular checks can help ensure its longevity.

6. Are there any grants available for home insulation in Ireland?

Yes, there are various grants available through schemes like the Sustainable Energy Authority of Ireland (SEAI) for homeowners looking to improve their home’s insulation and energy efficiency. Check the SEAI website for the latest information.

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