How much does a garden room cost in Ireland? A full breakdown

If you’ve ever thought about adding more space at home, a garden room could be the perfect solution. Whether it’s a home office, a gym, or just somewhere quiet to unwind, it gives you extra space without changing your home itself.

When looking at a garden room, two of the first questions most people ask are simple: “how much does it cost to build a garden room?” and “are garden rooms worth it?”

In Ireland, a garden room can cost from around €6,000 to €20,000+ for a standard build, based on supplier examples and size ranges. Larger or higher-spec garden rooms can cost €30,000 or more, with some premium ranges starting from around €32,000 plus VAT. The final price usually depends on the size, insulation, finish, site preparation and whether you need electricity, heating or Wi-Fi installed. ^1, 2

Let’s break down how much it costs to build a garden room so you can see what works for your space and budget.

What is the average cost of a garden room?

Different garden room sizes will fulfil different needs for each home and affect average costs. Small garden rooms are ideal if you just need a quiet place to work or focus during the day and are usually cheapest. Meanwhile, medium size garden rooms work well as a home office, gym, or family space but come at an extra cost. Large garden rooms may then be needed if you just need that extra space and are naturally most expensive. See summary of average garden room costs below:

Premium garden room suppliers may quote higher starting prices, particularly where the package includes features such as foundations, insulation, internal electrics, flooring, plastered walls, windows and doors.²

What affects the cost the most?

Your final price will depend on a few key factors:

1. Size and layout

   Larger spaces need more materials and labour, so naturally cost more. Simple designs are usually cheaper than custom layouts.

2. Insulation

   If you plan to use your garden room throughout the entire year (especially as a home office), good insulation is essential.

3. Finish and extras

   Features like flooring, lighting, heating, or storage can all add to the cost. It can help to separate what you need now versus what you can add later.

4. Site preparation

   Groundworks (like a concrete base) can add to the overall price.

5. Utilities

   Connecting electricity, heating, or WIFI may come at an additional cost depending on your set-up.

Do garden rooms add value to your home?

Whether a garden room will add value or not to you home will depend on a number of factors. It may help with buyer appeal if you are looking at selling your home. However, the value it may add will depend on a number of factors such as if all necessary legal requirements were followed (such as planning permission) as well as the build quality of the unit (including insulation quality, heating, finish and more). Each garden room may also have a different lifespan therefore it should generally not be relied upon to increase sale price of your home.

So, are garden rooms worth it?

For many homeowners, the value goes beyond the cost.A garden room gives you flexible space right where you need it, whether that’s a calm place to work, a home gym, or somewhere for the kids to use. It can also make your home more appealing if you ever decide to sell. It’s a simple way to create extra space without the disruption of a full extension.

How to build a garden room on a budget

If you’re planning carefully, there are a few ways to keep costs under control:

• Start with the essentials - focus on insulation, lighting, and a practical layout. If you’re planning on using the space to work from home, check out our list of home office must haves before you start planning.
• Keep the design simple - straight shapes are cheaper to build
• Plan any extra features for a later date - things like heating or storage can be added over time
• Compare prices - this gives you a clearer sense of what’s included

If you are looking for more ways to bring this space to life without breaking the bank, check out our budget design tips.

Planning your budget

Before you get started, it’s worth thinking about how you’ll fund the project. A Home Improvement Loan from Avant Money offers a simple way to spread the cost over time with flexible terms and fixed interest rates on loans from €5k - €75k.

If you're looking for more information, you can learn more in our guide to Home Improvement Loans and how they work.

¹ Source: Garden Room Prices in Ireland: Bespoke Garden Cost as of June 2026

² Source: GardenRooms.ie garden room pricing page as of June 2026

*Rates and loan terms are correct as of 1st July 2026 and are subject to change. The Maximum APR (Annual Percentage Rate) on all Avant Money loans is 19.9%. Minimum loan term is 12 months, and maximum term is 120 months. Loan terms vary depending on the purpose of the loan. Terms greater than 84 months up to a maximum of 120 months are only available for Refinance and Home Improvement Loans of €20,000 to €75,000.

Representative example: On a €30,000 loan over 5 years, at a fixed rate of 5.9% (6.1% APR) you will pay €578.59 a month. The total cost of credit would be €4,715.41 and the total amount repayable would be €34,715.41.

Lending criteria, terms and conditions will apply. Personal Loans are available to residents of the Republic of Ireland over the age of 18 and are subject to repayment capacity and financial status. Proof of income and a credit reference agency search will be required to help us approve your request. Personal Loans are unsecured and not available for business purposes, house purchase or investment.

Our interest rates vary depending on the value of your loan and credit profile. We will assign you the appropriate interest rate once your application has been reviewed. To find out more about the loan values and applicable interest rates, check out our Personal Loan rates table.

Bankinter S.A., trading as Avant Money, is authorised by the Banco de España in Spain and is regulated by the Central Bank of Ireland for consumer protection rules.