Green Roof Cost in Ireland

John McEvoy
November 25, 2023

Considering a green roof but worried about the cost? You're not alone; many have been there too! That's why, at HP Roofing, we're committed to guiding you every step of the way.

Navigating through a sea of quotes and choices might feel overwhelming. But guess what? After some deep digging, we found that prices typically range from £11 to £22 per square foot. These vary based on design, materials, and size.

In this article, we'll break down the green roof costs for you, making your journey to a greener home a breeze!

Understanding Green Roof Cost

Factors such as size, materials, and installation methods affect the cost of a green roof. The average cost per square metre or square foot can be determined using a green roof cost calculator.

Factors Affecting Green Roof Cost

Green roofs bring many benefits but also have different costs. Here are the factors that can change the price of a green roof:

  1. Type of Green Roof: Extensive green roofs cost less. They use only a few inches of soil. Intensive roofs cost more because they use deeper soil.
  2. Size of the Roof: The larger the roof, the higher the cost. More materials and labour are needed for big roofs.
  3. Depth of Soil: Deep soil means more cost. It needs more materials and work to set up.
  4. Growing Medium: The type of plants you pick can change the cost too. Some plants need costly soil or care.
  5. Location: Where your home is can change the price as well. In some places, it might be harder to get materials or find workers.
  6. Labour Cost: Paying for workers is part of the price as well.
  7. Building Structure: If your house needs extra work to hold a green roof, this will add to its price.

Cost Per Square Metre

When considering the cost of a green roof, it's important to look at the cost per square metre. This metric can give you a better idea of how much you'll be spending on your project. At HP Roofing, we offer competitive pricing to ensure you get the best value for your money.

The cost per square metre for an extensive green roof can range from a few hundred pounds to over £1,000. On the other hand, intensive roofs with deeper soil and more complex designs can have higher costs.

It's worth noting that factors like the size of the roof and the type of growing medium used can also impact the overall cost. By understanding this metric, you can make informed decisions about your green roof project and stay within your budget.

Cost Per Square Foot

The cost per square foot for a green roof can vary depending on several factors. On average, it can range from $15 to $30 per square foot, which includes the design, materials, labour, and installation.

However, it's important to note that this cost can be double that of a traditional roof. Factors such as the type of growing medium used, the depth of the soil, and the overall size of the green roof can all impact the final cost.

It's also worth considering that annual maintenance costs for a green roof typically range from $0.75 to $1.50 per square foot. While there may be an initial investment involved in installing a green roof, it's important to consider its long-term benefits, such as improved energy efficiency and environmental advantages, alongside the cost.

Green Roof Cost Calculator

To help Irish homeowners determine the cost of installing a green roof, you can use a green roof cost calculator. This tool takes into account factors such as the size of your roof, the type of materials needed, and any additional features you want to include.

By inputting these details, you can get an estimated cost for your green roof project. Keep in mind that while this calculator provides a good starting point, it's always best to consult with professionals for accurate pricing information specific to your situation.

Average Cost Of Green Roof Installation

The average cost of green roof installation in the UK for 2022–2023 and a comparison of costs for different types of green roofs Find out more about the cost breakdown and make an informed decision for your eco-friendly roofing project.

UK Average Cost In 2023/2024

In the UK, the average cost of installing a green roof in 2023/2024 is around £80–£250 per square metre. This includes the design, materials, labour, and installation. The total cost can vary depending on factors such as the size and complexity of the project.

It's important to consider that this is just an average estimate, and actual costs may differ based on individual circumstances. However, it's worth noting that while green roofs may have a higher upfront cost compared to traditional roofs, they offer long-term benefits such as improved energy efficiency and environmental sustainability.

Comparison Of Costs For Different Types Of Green Roofs

When we look at different types of green roofs, we find a wide range of costs. Factors such as the depth of the growing medium and the need for irrigation or other maintenance can significantly affect the price.

Types of Green Roof

Extensive Green Roof:

Cost: $15–$20 per square foot.


Lower cost because of the shallow soil depth.

Limited plant variety.

Annual maintenance costs: $0.75 to $1.50 per square foot.

Semi-Intensive Green Roof

Cost: $20–$25 per square foot.


A blend of extensive and intensive characteristics.

Allows for a greater plant variety with a moderate soil depth.

Intensive Green Roof

Cost: $25-$30 per square foot.


Higher cost because of deeper soil that supports a wider variety of plants, including small trees.

Comes with higher maintenance costs.

Remember, while the initial cost of installing a green roof can be steep, these roofs can actually save money in the long run due to their improved energy efficiency. Also, they deliver significant environmental benefits, something that's hard to put a price on.

Maintenance And Additional Costs

Green roofs require regular maintenance to ensure their longevity and effectiveness. This includes tasks such as weeding, pruning, and monitoring irrigation systems. Additionally, there may be additional costs associated with hiring a structural engineer for load calculations or obtaining planning permission.

To learn more about the maintenance requirements and potential expenses of green roofs, keep reading.

Typical Maintenance Requirements And Costs

Maintaining a green roof is important to ensure its longevity and effectiveness. Here are some key maintenance requirements and costs that Irish homeowners should consider:

  1. Regular inspections: It's essential to inspect the green roof regularly for any signs of damage, such as leaks or plant wilting.
  2. Weed control: Weeds can compete with the plants on the green roof, so regular weeding is necessary to maintain its health and beauty.
  3. Fertilisation: Adding nutrients to the soil helps promote healthy plant growth. Fertilisers specifically formulated for green roofs may be required.
  4. Irrigation: Green roofs need sufficient water, especially during dry periods. Installing an irrigation system can ensure proper moisture levels.
  5. Pruning and trimming: Trimming back overgrown plants prevents them from overshadowing others or obstructing drainage systems.
  6. Drainage maintenance: Keeping the gutters and drains clear of debris ensures proper water flow and prevents water pooling.
  7. Roof repair: If any damage or leaks occur, timely repairs are necessary to prevent further issues and maintain the integrity of the roof structure.
  • Annual maintenance cost: typically range from €0.65 to €1.30 per square metre ($0.75–$1.50 per square foot).
  • Professional services: Hiring a specialised contractor for inspections or larger maintenance tasks might incur additional fees.
  • Plant replacement: If certain plants die or become damaged over time, they may need to be replaced at an additional cost.
  • Green roof maintenance
  • Regular inspections
  • Weed control
  • Fertilization
  • Irrigation
  • Pruning
  • Drainage maintenance
  • Roof repair
  • Annual maintenance costs
  • Professional services
  • Plant replacement

Potential Additional Costs 

We should also consider potential additional costs when installing a green roof, such as fees for structural engineers and obtaining planning permission. These costs can vary depending on the complexity of the project and the requirements set by local authorities.

It is important to factor in these expenses when budgeting for your green roof installation. Additionally, it's worth noting that hiring a structural engineer ensures that your green roof meets safety standards and can support the weight of the vegetation and soil.

Planning permission may be required to ensure compliance with regulations and avoid any legal issues down the line.

Final Words!

So, understanding the cost of green roofs is important for homeowners in Ireland. Factors like the type of roof, size, and maintenance affect the overall cost. While there can be initial expenses, green roofs can save money in the long run and provide environmental benefits.

It's worth considering these factors when making decisions about roofing to create a sustainable and eco-friendly living space.

Contact us today!

HP Roofing is a team of residential & commercial roofing contractors and solar panel installation experts in Dublin. We offer a wide range of services, from roof repairs and replacements to solar PV installations and maintenance, with quality beyond expectations.
Call HP Roofing 01 453 3366

Frequently Asked Questions

What is the cost of a green roof?

The cost of a green roof can vary based on building materials and design, but it usually costs more than traditional roofing.

How do I calculate the cost of my green roof?

You could use a roofing calculator to add up your costs. It includes things like waterproofing, the national average cost, and eco-friendly construction materials.

Are there ways to lower the cost of getting a green roof?

Yes! Consider looking into green roof subsidies or grants provided by local government bodies to support sustainable roofing for commercial buildings in urban environments.

Why does it make sense to pay more for a green roof?

While initial costs might be higher than traditional roofs, you'll see savings over time with lower energy bills through sustainable roofing practises, and the environmental benefits of green roofs are huge too!

Can getting a green roof help me earn back my investment?

Absolutely! Green rooftop case studies show that they have a good return on investment (ROI) because they last longer than normal roofs.

What factors contribute most to the cost of installing a green roof?

Various elements influence the cost of a green roof, such as the depth of soil, type of plants chosen, labour expenses, and location. It's essential to understand these factors for a comprehensive cost estimate.

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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.
Founder @ HPRoofing

The founder of HP Roofing, with years of industry experience, providing top-notch roofing and solar panel services for residential and commercial properties in Dublin, delivering high-quality and customised solutions that combine both aesthetic appeal and durable functionality.