Building Extension Cost Ireland

by | Feb 8, 2024 | Uncategorized

Building Extension Cost Ireland

Adding an extension to homes is an exciting project, but many Irish homeowners will agree that figuring out the costs can be tricky. We get how frustrating it may be to go through numerous prices while trying to make sense of changes to the existing pricing of materials and labour. It’s for this reason that we started looking first at market trends to compile this convenient guide on building extension costs in Ireland.

Here you’ll find everything from average square metre rates to factors affecting your total outlay. So why not take a deep breath and relax? Let’s break down the prices alongside one another and obtain some much-needed transparency.

Factors Affecting The Cost Of Building An Extension In Ireland

Several factors can significantly impact the cost of building an extension in Ireland, including location, size and design of the extension, quality of materials used, labour costs, and any additional features or renovations required.


The place where you live matters a lot. For example, living in Dublin may mean higher costs. This is because things often cost more in the city. Rural areas can have lower costs.

But it’s not always true, and other factors play a role too. You might need to pay more for travel if workers come from far away.

Size And Design Of The Extension

When it comes to the size and design of your extension, it can have a big impact on the cost. Generally, larger extensions will cost more because they require more materials and labour to build.

The design of the extension can also affect the cost, as more complex designs may require additional structural work or specialised materials. It’s important to carefully consider what you want from your extension and work with an architect or designer to create a plan that fits within your budget.

Remember, smaller and simpler designs are usually more cost-effective than large and intricate ones.

Quality Of Materials

When it comes to building an extension in Ireland, the quality of materials you choose can have a big impact on the overall cost. Higher-quality materials are generally more expensive, but they can also provide better durability and aesthetics.

It’s important to find a balance between your budget and the desired level of quality for your extension. Keep in mind that using lower-quality materials may save you money upfront, but they could lead to higher maintenance costs down the line.

So, consider your options carefully and make sure to choose materials that will meet your needs and stand the test of time.

Labour Costs

Labour costs are an important factor to consider when building an extension in Ireland. The cost of labour can vary depending on the complexity of the project and the location. It is recommended to get multiple quotes from different contractors to ensure you are getting a fair price for the work.

Planning and budgeting carefully can also help control labour costs.

Additional Features Or Renovations

When adding additional features or renovations to your house extension in Ireland, it is important to consider how these choices will affect the overall cost. Features such as a kitchen or bathroom upgrade, installing underfloor heating, or incorporating energy-efficient measures can increase the cost of your project.

Similarly, choosing high-end finishes and materials will also add to the total expense. It’s essential to carefully budget for these additional features and renovations and factor them into your overall plan.

By doing so, you can ensure that you have a realistic understanding of the final cost of your house extension project in Ireland.

Average Cost Of Building An Extension In Ireland

The average cost of building an extension in Ireland varies depending on factors such as size, design, and location.

Per Square Metre

The cost of building an extension in Ireland is often calculated per square metre. For a single-story extension with a standard finish, you can expect to pay around €1,900 to €2,300 per square metre.

If you want a high-spec finish, the cost may be slightly higher, at around €2,000 to €2,500 per square metre. As of October 2019, the average cost for a single-story extension is approximately €1,000 per square metre.

It’s important to note that these are just rough estimates, and the actual cost can vary depending on factors such as location and design.

Single-Story Vs Two-Story

When deciding whether to build a single-story or two-story extension, there are some important factors to consider. A single-story extension is generally less expensive than a two-story one, as it requires fewer materials and labour.

However, a two-story extension can provide more living space without taking up too much yard space. It’s also worth noting that the cost per square metre for a two-story extension may be slightly higher due to additional construction requirements.

Ultimately, the choice between a single-story and a two-story home depends on your budget and how much space you need for your home in Ireland.

Including Renovation Costs For The Existing House

When planning a building extension in Ireland, it’s important to consider the renovation costs for your existing house. This can include any necessary upgrades or modifications needed to connect the extension with the current structure.

Considering renovation costs for your building extension project is a smart move. Costs can fluctuate based on factors like integration complexity and your home’s condition. To get precise estimates tailored to your unique situation, consult with experts like New Century.

Tips For Controlling Extension Costs

To control extension costs, it is important to get multiple quotes from different contractors, consider alternative materials that are more cost-effective, and meticulously plan and budget for the project.

Get Multiple Quotes

To save money on your extension project, it’s a good idea to get multiple quotes from different builders or contractors. This will help you compare prices and find the best deal. Remember that the cheapest option may not always be the best quality, so consider factors like reputation and experience when making your decision.

By getting multiple quotes, you can ensure that you’re getting a fair price for your extension and avoid any unexpected costs later on. It’s worth taking the time to research and gather quotes from several professionals before making a final choice.

Consider Alternative Materials

When building an extension in Ireland, it’s worth considering alternative materials to help control costs. Traditional materials like brick and block can be expensive, so exploring options like timber frames or prefabricated systems could be more cost-effective.

These alternatives are often quicker to install, reducing labour costs. Additionally, you can choose from a range of finishes to suit your budget, from standard to high-spec. By considering alternative materials, you may find that you can achieve the look and quality you want while staying within your budget.

Plan And Budget Carefully

To keep the costs of your house extension in check, it’s important to plan and budget carefully. Start by determining the size and design of your extension based on your needs and budget.

Consider alternative materials that may be more cost-effective without compromising quality. Get multiple quotes from reputable builders to compare prices and ensure you’re getting a fair deal.

Don’t forget to factor in any additional features or renovations you may want for your extension, as they can increase costs. By carefully planning and budgeting, you can have better control over the overall cost of your extension project.


Building an extension in Ireland can vary in cost depending on factors such as location, size, design, materials, and labour. It’s important to carefully plan and budget for your project.

Getting multiple quotes and considering alternative materials are some ways to help control costs. So, by understanding the average costs and taking steps to manage expenses, you can successfully complete your house extension within your budget in Ireland.

Frequently Asked Questions 

What is the average cost of a house extension in Ireland?

The average cost of extending a house in Ireland can vary based on factors like whether it’s single-storey or two-storey and the level of finish needed.

How can property owners estimate the cost of a house extension in Ireland?

To get a rough guide price for an extension, property owners should consider construction costs, renovation costs, and any fees for planning permission for building extensions in Ireland.

Are there different types of house extensions with varying costs in Ireland?

Yes, the cost comparison of different types of house extensions will show that prices can change based on things like size and design

Can I find builders who specialise in building extensions in Ireland?

Definitely! There are many skilled extension builders and building extension contractors available across Ireland to help you with your project.

Do you have tips for managing the budget for a home extension?

Planning ahead is key to managing any potential increase in both building extension costs and home extension costs within Irish territory that might arise due to high-spec finishes or other reasons.

What permits and regulations should I be aware of when planning a house extension in Ireland?

When planning a house extension, it’s crucial to be aware of local permits and regulations. In Ireland, you may need planning permission for certain types of extensions. It’s advisable to consult with your local authority or a qualified architect to ensure your project complies with all legal requirements.