House Extension Cost In Ireland

by | Nov 3, 2023

House Extension Cost In Ireland

Considering a house extension in Ireland but worried about the cost? It’s an understandable concern, given that the average price for such projects can range anywhere from €1,500 to €3,400 per square metre, depending on various factors.

This article will provide you with invaluable insights into how these costs are determined and practical tips on managing your budget effectively. So, let’s get started.

Factors Affecting House Extension Costs in Ireland

Several factors can significantly impact the cost of house extensions in Ireland, including the location, size, and scope of the extension, the materials and finishes used, and whether it is a single- or two-storey extension.


Property location plays a pivotal role in the cost of house extensions in Ireland. For instance, an extension project embarked upon in urban areas like Dublin tends to be significantly more expensive than similar projects executed in rural regions.

This is largely due to the high cost of living, labour rates, and property values inherent in city locations as opposed to countryside settings. Land availability also factors into cost variations, with scarce land supply driving up costs within densely populated cities.

Therefore, homeowners must bear these considerations in mind when planning for house extensions on their properties based on location specifics.

Size and scope of the extension

The size and scope of your house extension are significant factors that influence the overall cost. The larger the extension, the more materials and labour will be required, resulting in higher expenses.

Additionally, if your extension involves complex design features or structural changes, such as adding a second story or installing specialised finishes, it can also impact the cost.

When planning your budget for a house extension project in Ireland, make sure to consider these factors along with other aspects like location and type of extension.

Materials and finishes used

The materials and finishes used for your house extension can have a significant impact on the overall cost. Different types of materials, such as bricks, blocks, or timber, can vary in price.

Similarly, the quality of finishes you choose, like flooring and fixtures, can also affect the final cost. Keep in mind that opting for higher-end materials and finishes will generally result in a higher cost for your extension.

It’s important to carefully consider your budget and priorities when selecting materials and finishes to ensure they align with what you’re willing to spend.

Type of extension (single or two-storey)

Whether you opt for a single-storey or two-storey extension, the type of extension you choose will have a significant impact on the overall cost. Single-storey extensions tend to be more affordable than two-storey extensions, as they require fewer materials and labour.

However, if you need additional living space and have the budget for it, a two-storey extension may be worth considering. Ultimately, the decision should be based on your specific needs and budget constraints.

Average House Extension Costs in Ireland

Single-storey extensions in Ireland typically cost between €1,500 and €2,000 per sqm, while two-storey extensions can range from €2,000 to €3,400 per sqm. Want to know how you can manage these costs? So, keep reading!

Single-storey extensions: €1,500 to €2,000 per sqm

A single-storey extension in Ireland typically costs between €1,500 and €2,000 per square metre. This price range takes into account factors such as the location, size, and materials used for the extension.

It’s important to note that additional features or finishes may increase the overall cost. By understanding these average prices, homeowners can have a better idea of how much they might expect to budget for their single-storey house extension project in Ireland.

Two-storey extensions: €2,000 to €3,400 per sqm

Two-storey extensions in Ireland typically cost between €2,000 and €3,400 per square metre. This price range takes into account factors such as the size and scope of the extension, as well as the materials and finishes used.

Two-storey extensions offer homeowners the opportunity to significantly increase their living space and can be a cost-effective option compared to moving to a larger house. It is important to carefully plan and budget for this type of extension to ensure that costs are managed effectively throughout the project.

Tips for Managing House Extension Costs

To ensure you stay within budget, it’s crucial to get multiple quotes, plan and budget carefully, consider financing options, and have a contingency fund. Learn more about these tips for managing house extension costs in Ireland.

Get multiple quotes

To ensure you get the best price for your house extension in Ireland, it’s important to get multiple quotes from different builders or contractors. This allows you to compare prices and the services offered, helping you make an informed decision.

By obtaining several quotes, you can see if there are any significant variations in cost and determine which builder offers the best value for money. Getting multiple quotes also gives you the opportunity to ask questions about materials, timelines, and potential additional costs that may arise during the project.

So don’t hesitate to reach out to several professionals before making your final choice.

Plan and budget carefully

To ensure a smooth and cost-effective house extension project, it is crucial to plan and budget carefully. Start by setting clear objectives for your extension and determining the scope of work you want to undertake.

Consider factors such as the size, layout, and design of your extension, as well as any specific features or finishes you desire. Once you have a clear vision in mind, create a detailed budget that includes all the necessary expenses, from construction materials and labour costs to permits and fees.

By doing so, you can avoid unexpected surprises down the road and stay on track financially throughout your project.

Consider financing options

If you’re concerned about the cost of a house extension in Ireland, it’s important to consider your financing options. There are various ways to fund your project, such as personal savings, loans from banks or credit unions, or even remortgaging your home.

Carefully evaluate each option and choose one that suits your financial situation and goals. Keep in mind that borrowing money will incur interest and repayment obligations, so be sure to factor these costs into your budget.

By exploring different financing options, you can find a solution that allows you to proceed with your house extension while still being mindful of your finances.

Have a contingency fund

Ensure you have a contingency fund in place when planning your house extension. Unexpected expenses can arise during the construction process, such as hidden structural issues or changes to building regulations.

By setting aside some extra funds, you’ll be prepared for any unforeseen costs that may come up. This will help you avoid financial stress and delays in completing your project.

Conclusion: Estimating House Extension Costs in Ireland

In conclusion, determining the cost of a house extension in Ireland involves considering several factors, such as the location, size, and scope of the extension, the materials and finishes used, and whether it is a single-storey or two-storey extension.

On average, single-storey extensions can cost between €1,500 to €2,000 per square metre, while two-storey extensions range from €2,000 to €3,400 per square metre. So, to manage costs effectively, it is important to get multiple quotes, plan and budget carefully, consider financing options if necessary, and have a contingency fund in place.


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

The average cost per square metre for house extensions in Ireland varies depending on factors such as size, design, and finishes.

Can I use a calculator to estimate the costs of extending my home in Ireland?

Yes, you can use a house extension cost calculator to estimate the cost of single-storey or two-story extensions, including any renovations needed for your existing home.

How do finish types affect house extension prices in Ireland?

High-spec finishes increase the overall price compared to standard finishes when building an extension in Ireland, making it essential for homeowners to consider before planning their budget.

Are there guides available for understanding typical costs related to extending houses in Ireland?

Several resources provide a pricing guide that offers a detailed breakdown of estimated costs associated with various types of extensions specifically targeted at Irish homeowners

Do I need planning permission to add an extension to my house in Ireland?

In most cases, yes! Securing appropriate planning permissions from regulatory bodies is crucial when considering any sort of construction addition, including home extensions.

Are there grants available that could help offset some costs associated with building an extension?

Absolutely! The Irish government does offer specific grants aimed at assisting homeowners who are looking into carrying out major renovation projects like extending their homes.

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