House Extensions Ireland Cost: an In-Depth Analysis

Farnan Culkin
May 21, 2023

Are you considering a home extension but uncertain about the house extensions Ireland cost? This concern is shared by many homeowners in Ireland who wish to add more space or value to their property. At BuildPro, we offer expert consultation to navigate the complex world of house extensions and their costs. Our comprehensive guide will take you through every detail, ensuring that you will have a thorough understanding of this subject by the end.

What is a House Extension? (H3)

Before we dive into the costs, it's essential to understand what a house extension is and how it can add value to your home. A house extension is an additional structure built onto your existing property. It can serve various purposes, such as providing an extra bedroom, setting up a home office, expanding your kitchen or living room, or adding a sunroom or a conservatory.

Why Consider a House Extension?

House extensions offer several benefits:

  • Provides additional space for a growing family or evolving lifestyle
  • Enhances the functionality and comfort of your home
  • Increases property value and aesthetic appeal
  • Offers a personalised solution based on your preferences and needs
  • Enables expansion without the hassle and expense of relocating

The Different Types of House Extensions and Their Cost Implications

There are various types of house extensions, each with its unique features, benefits, and cost implications. Your choice would depend on your budget, space availability, design preferences, and planning regulations.

Single-storey Extension

A popular, cost-effective option, the single-storey extension does not alter your property's roofline or footprint and can be built at the front, back, or side of your house.

Double-storey Extension

While more complex and costly than a single-storey extension, a double-storey extension offers additional space and value to your home. This type alters the roofline and requires new foundations.

Side Return Extension

If you have unused space on the side of your property, a side return extension could be an ideal choice. This type of extension preserves your property's street appeal but may cost more than a single- or double-storey extension.

Loft Conversion

A loft conversion offers additional space without occupying more ground space. However, this option may not be suitable for all properties due to its cost and specific structural requirements.


A conservatory, although less common, can provide additional light and space to your home at a relatively lower cost. However, it may require lesser insulation and heating.

Factors that Determine the House Extensions Ireland Cost

The extension type is just one aspect that affects the overall cost. Other influencing factors include


The larger the extension, the more materials, labour, and time required, directly impacting the cost.


A customised design that complements your house style or incorporates complex features will typically cost more than a standard design.


A superior finish involving high-quality flooring, lighting, painting, plumbing, electrical wiring, and fittings will add to the cost.


The location of your property can also affect the extension cost. Urban areas usually have higher land prices and stricter planning restrictions, leading to higher costs.


The contractor you choose plays a significant role in determining the cost. Different contractors charge different rates based on their expertise, reputation, and the quality of their work.

Understanding the Average House Extensions Ireland Cost

While the cost of an extension can vary significantly based on the aforementioned factors, here are some average cost estimates based on different types and finishes:

TypeStandard FinishHigh Spec FinishSingle-storey€1,900 - €2,300 per sqm€2,000 - €2,500 per sqmDouble-storey€2,000 - €2,500 per sqm€2,600 - €3,400 per sqmSide return€2,200 - €2,800 per sqm€2,800 - €3,600 per sqmLoft conversion€1,500 - €2,000 per sqm€2,000 - €2,500 per sqmConservatory€1,200 - €1,800 per sqm€1,800 - €2,400 per sqm

These costs are inclusive of VAT but do not account for fees related to architects, engineers, surveyors, planners, or other professionals that may be involved in your project.

How to Plan Your Budget and Avoid Common Pitfalls?

Here are some tips to help you save money and avoid common pitfalls when building a house extension:

Set a Realistic Budget and Stick to It

Before you start your project, work out how much you can afford to spend and set a realistic budget. Keep track of all your costs and try to stick to your budget as much as possible.

Get Multiple Quotes

Don’t just go with the first contractor you find. Get at least three quotes so you can compare prices and services. Remember, it’s not just about the cheapest price but also about the quality of work and the contractor's reliability.

Plan Carefully

The more detailed your plans are, the less chance there is of unexpected costs or delays. This includes planning your layout, choosing your materials, and deciding on your finish.

Choose Quality Materials

Choosing high-quality materials can save you money in the long term as they will likely last longer and require less maintenance. Plus, they can add more value to your home.

Hire Professionals

Unless you are a qualified builder, hiring professionals is worth ensuring the job is done correctly. Mistakes can be costly to fix and can cause delays.

Consider Energy Efficiency

Investing in energy-efficient features, such as insulation and double glazing, can reduce energy bills and add value to your home.

How BuildPro Can Help with Your House Extension Project

BuildPro, with over 20 years of experience in the industry, offers expert advice, guidance, and support throughout your extension project. Our comprehensive services include:

  • Assessing your needs, budget, and expectations
  • Providing realistic and transparent quotes
  • Assisting in choosing the best type, design, and finish for your extension
  • Managing planning permissions and building regulations
  • Coordinating with reliable contractors
  • Supervising all stages of construction
  • Ensuring quality control and customer satisfaction

By choosing BuildPro as your consultation company, you can save time and money, avoid stress and hassle, and ensure professional, personalised service.

Begin Your House Extension Journey with BuildPro

Understanding the house extensions Ireland cost can be a complex task, but with the right guidance and expertise, it can be a rewarding investment. At BuildPro, we make this journey seamless for you. Contact our team today to take the first step towards extending your home. Let's create your dream space together, optimised for comfort and budget.

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Frequently Asked Questions

What is the average house extension price in Ireland?

The average cost of a house extension in Ireland can vary greatly depending on the size, design, location, and extension type. A rough estimate, however, would fall between €1,900 to €3,400 per square metre.

How much does a 40m2 extension cost?

The cost of a 40m2 extension can vary based on numerous factors, such as the type of extension, finish level, location, and more. You could expect to pay anywhere from €76,000 to €100,000 using average costs. This is a rough estimate, and the exact price can differ based on specific project details.

How big is a 40-square-metre extension?

A 40-square-metre extension equates to roughly 430 square feet. To visualise, it is approximately equal to a fairly large room or a few smaller rooms.

What is the most expensive part of a house extension?

Typically, the most expensive part of a house extension is the construction itself, which includes the cost of materials and labour. Other significant expenses include architectural and planning fees and interior finishing costs.

Is it worth putting an extension on my house?

Yes, generally speaking, adding an extension to your house can increase its value and provide additional living space. It's often cheaper than moving to a larger house, and you can customise the space to meet your specific needs.

How long does it take to build an extension in Ireland?

The timeframe for building an extension in Ireland can vary depending on the size and complexity of the extension, as well as the planning and approval process. On average, it could take anywhere from 10 weeks for a small, single-storey extension to several months for a larger or more complex project.

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.
Farnan Culkin

Farnan Culkin is a seasoned expert in the home improvement industry and the proud founder of BuildPro. His passion for home renovation and home extensions has led him to create a platform that educates homeowners, helping them transform their Irish homes into their dream dwellings.