How to Choose the Right Building Contractor in Ireland

By Pádraig Ryan | 18 January 2026 | 5 min read

Choosing the wrong building contractor is the single most expensive mistake you can make when renovating or extending your home. We have seen it too many times in Tipperary — homeowners left with half-finished work, missing money, and no legal recourse. This guide will help you make an informed decision and protect yourself from the outset.

Check Their Credentials

Before you even discuss your project, verify the basics. A reputable contractor in Ireland should be able to provide proof of public liability insurance (a minimum of EUR 6.5 million is standard for residential work), employer's liability insurance, a current tax clearance certificate (C2), and evidence of registration with a professional body such as CIF (Construction Industry Federation) or CIRI (Construction Industry Register Ireland).

CIRI registration became mandatory for certain categories of building work under the Building Control Act 2007. While not all work requires CIRI registration, a builder who is registered has demonstrated that they meet minimum competency standards. It is a good baseline indicator of professionalism.

Look at Their Previous Work

Any good builder will be happy to show you examples of completed projects. Ask to see photographs of work similar to yours — if you want a kitchen extension, look at kitchen extensions they have done, not just bathroom renovations. Even better, ask if you can speak to previous clients or visit a recently completed project.

Online reviews on Google, Facebook, and trade directories are useful but should not be your only source of information. Look for patterns in reviews rather than individual comments. A consistent theme of "finished on time," "clean and tidy," and "good communication" is far more valuable than a handful of five-star reviews with no detail.

Get a Detailed Written Quote

A verbal quote or a one-page estimate is not good enough for a building project. You need a fully itemised written quotation that breaks down every element of the work: foundations, blockwork, roofing, plastering, plumbing, electrics, tiling, painting, and finishes. Each line item should include the material specification and the cost.

The quote should clearly state what is included and what is not. For example, does the price include skip hire, scaffolding, and building regulation compliance? Does it include the kitchen units or just the installation? Ambiguity in a quote leads to disputes later. At Greenfield Build & Renovate, our quotes are fully itemised with no hidden extras — what we quote is what you pay.

Red Flags to Watch For

Be very cautious of any builder who asks for a large deposit upfront. While a small stage payment to cover initial material purchases is reasonable, a request for 30% or 50% before any work begins is a major red flag. Similarly, be wary of builders who are reluctant to put anything in writing, who do not have a fixed business address, who quote significantly below everyone else, or who pressure you to sign quickly.

A builder who says planning permission or building regulations are "not needed" without properly assessing your project is another warning sign. As we discussed in our planning permission guide, many homeowners have been caught out by this advice. A professional builder will always direct you to check compliance before starting work.

Agree a Contract and Payment Schedule

For any project over EUR 10,000, you should have a written contract in place. This does not need to be a complex legal document — the RIAI (Royal Institute of the Architects of Ireland) standard form of building contract is widely used and well understood. The contract should include the scope of work, the total price, a payment schedule tied to stages of completion, a start date and estimated completion date, and provisions for variations and dispute resolution.

Payment should be linked to completed stages of work, verified on site. A typical schedule might be: 10% on commencement, then payments at foundations complete, walls up, roof on, first fix, second fix, and a final retention payment of 5% to 10% held for a defects liability period (typically six to twelve months).

Trust Your Instincts

Beyond the paperwork, pay attention to how the builder communicates. Do they return calls promptly? Are they clear and upfront about timelines and costs? Do they listen to what you want? A good builder-client relationship is built on communication and trust. If something feels off during the quote stage, it is unlikely to improve once the work starts.