How Can I Find Reliable Builders for My House Extension Project?

by | Feb 22, 2024 | Uncategorized


Are you looking for a way to add more space, value, and comfort to your home? Do you want to transform your property without the hassle and expense of moving? If so, a house extension could be the perfect solution for you. But how can you find reliable builders for your house extension project? How can you ensure that you get the best quality, price, and service for your investment?

This blog will guide you through the process, from planning and design to construction and completion to help you find the best builder for your house extension project in Ireland. So, let’s dive right in!

What is a House Extension and Why Consider It?

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. It offers several benefits, such as:

  • Providing additional space for a growing family or evolving lifestyle
  • Enhancing the functionality and comfort of your home
  • Increasing property value and aesthetic appeal
  • Offering a personalised solution based on your preferences and needs
  • Enabling expansion without the hassle and expense of relocating

Different Types of House Extensions and Their Cost Implications

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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. Here are some of the most common types of house extensions and their approximate costs in Ireland:

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.

The average cost of a single-storey extension in Ireland is between €1,200 to €1,800 per square metre.

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. 

The average cost of a double-storey extension in Ireland is between €1,500 to €2,000 per square metre.

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.

The average cost of a side return extension in Ireland is between €1,800 to €2,500 per square metre.

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. 

The average cost of a loft conversion in Ireland is between €1,500 to €2,500 per square metre.


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

The average cost of a conservatory in Ireland is between €800 to €1,200 per square metre.

These costs are only estimates and may vary depending on the size, design, and location of your extension. You should also consider other expenses, such as planning permission fees, architect fees, VAT, and contingency funds.

How to Choose a Builder for Your House Extension Project?

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Choosing the right builder for your house extension project is crucial for ensuring a successful outcome. 

A good builder will deliver high-quality work, stick to your budget and timeline, and communicate effectively with you throughout the process. A bad builder, on the other hand, could cause delays, defects, disputes, and dissatisfaction. 

Here are some tips on how to choose a builder for your house extension project:

Find out if they have done similar extensions to yours

You want a builder who has experience and expertise in the type of extension you want. Ask for examples of their previous work, preferably in your area, and check their portfolio and reviews. You can also ask for references from their past clients and visit their completed projects if possible.

Make sure you are comfortable with them

You will be working closely with your builder for several weeks or months, so you need to have a good rapport and trust with them. Meet them in person, ask questions, listen to their suggestions, and observe their professionalism and attitude. You want a builder who is friendly, honest, respectful, and responsive.

Look out for experience as much as accreditations

While accreditations and memberships from reputable organisations can indicate a builder’s credibility and quality, they are not a guarantee of their performance.

Experience, on the other hand, is a more reliable indicator of a builder’s skills and reputation. Look for a builder who has been in the business for at least five years and has a proven track record of delivering successful projects.

Get like-for-like quotes and make sure everything is included

Always ask for comparable written quotes from between three to five builders. Make sure the quotes are detailed and itemised, covering all aspects of the project, such as materials, labour, subcontractors, waste disposal, insurance, and VAT. Compare the quotes carefully and look out for any hidden or extra costs. 

Avoid choosing the cheapest or the most expensive quote, as they may indicate poor quality or overcharging. Choose the quote that offers the best value for money and meets your expectations.

Establish a contract and a payment plan

Before you hire a builder, make sure you have a written contract that outlines the scope, cost, and duration of the project, as well as the terms and conditions of the agreement. The contract should also include a payment plan that specifies the amount and frequency of payments, as well as the milestones and deliverables. 

Avoid paying large deposits or upfront fees, and only pay for work that has been completed and inspected. You should also keep a record of all payments and invoices for future reference.


Choosing the right builder for your house extension project is a critical decision that can significantly impact the success of your project. By following the above tips, you can ensure that you select a builder who is experienced, reliable, and capable of delivering a high-quality extension that meets your needs and expectations.

Remember, the right builder will not only provide you with a beautifully extended home but also a pleasant and stress-free building experience.

If you are ready to start your house extension project, contact New Century today for a free consultation and quote. We will be happy to discuss your ideas, answer your questions, and provide you with a personalised and competitive proposal. 


How can I ensure the builder I choose for my extension is reliable?

Look for a builder with a solid track record and ask to see examples of their previous work. Check if they are members of a trading body and ask for written quotes that include all details of the project. It’s also wise to verify their insurance coverage​​​​.

What questions should I ask before hiring a builder?

Important questions include asking about their experience with similar projects, how they handle changes and unforeseen issues, their insurance coverage, safety measures, communication methods, cost breakdowns, and compliance with building codes and regulations​​​​.

What should I do if there are changes or unforeseen issues during the construction process?

It’s important to have a clear communication plan with your builder. Discuss how they handle changes or unforeseen issues. Make sure these are documented and agreed upon. Also, check if they have insurance to cover any unexpected costs.​​​​

How can I manage the project to ensure it aligns with my vision?

Some homeowners choose to manage the project themselves to save money, but this requires time and knowledge. Alternatively, many builders offer project management services to handle coordination and oversight, potentially saving money and ensuring efficiency​​.

How can I integrate the extension seamlessly with my existing home?

To make the extension feel like part of the house, aim for open junctions between old and new spaces. Structural elements like joists might be needed for new openings, which can be hidden or made into a feature​​.

What insurance do I need when building an extension?

Don’t rely solely on your home insurance or the builder’s liability cover. Extension-specific insurance is necessary to cover the existing home insurance, the new extensions, materials, and your liability to others. Update your home and contents insurance once the extension is complete​​.