How to Find a Reliable Builder in Ireland

Hiring a builder is one of the highest-risk decisions a homeowner makes. The work is expensive, disruptive, and often tied to planning, engineers, banks, and family timelines. A reliable builder is not just someone who can build; they can price clearly, communicate, manage trades, and finish without leaving you exposed.

This guide is for Irish homeowners planning extensions, renovations, attic conversions, structural changes, and larger repair work.

Define the Job Before Contacting Builders

Builders can only price what you define. Before asking for quotes, write down:

• The rooms or structures affected

• Whether drawings are available

• Whether planning permission is granted or exempt

• What finishes you expect

• What you want included or excluded

• Your target start window

• Your contingency budget

For extensions, read our extension cost guide before calling. It gives you a baseline for how builders think about size, access, groundworks, finishes, and risk.

Insurance and Company Checks

Ask for:

• Public liability insurance

• Employer's liability insurance if they have staff

• A written business address

• Company or sole trader details

• VAT status where relevant

• References from similar jobs

For major work, check whether the business name and quote details match. If the person quoting, the invoice name, and the payment account all differ, ask why before paying anything.

References and Previous Work

Do not accept vague references. Ask for recent jobs similar to yours:

• Extension of similar size

• Renovation in a similar property type

• Attic conversion if that is the job

• Structural opening if steelwork is involved

Photos help, but conversations with past customers are better. Ask whether the builder stayed close to budget, handled snags, communicated delays, and kept the site safe.

Fixed Quote vs Estimate

A fixed quote gives more certainty, but it must be based on a clear scope. An estimate can be reasonable early on, especially before drawings, engineer details, or site investigation.

The danger is a quote that looks fixed but has vague exclusions. Look carefully for words like "provisional", "by others", "subject to site conditions", and "allowance". These may be normal, but they need numbers attached.

Deposits and Payment Schedules

For domestic building work, avoid large upfront payments. A small booking deposit may be reasonable, but major payments should be tied to visible milestones such as foundations, structure, roof, first fix, plastering, and completion.

Hold a final payment until snagging, certificates, and agreed paperwork are complete. If a builder insists on 50% upfront with no materials ordered or start date, treat it as a red flag.

Planning Permission and Building Control

Some work is exempt from planning, but exemption is not the same as no rules. Building Regulations still apply. Extensions, attic conversions, and structural changes may need engineer input, commencement notices, certificates, and BER-related details.

Use Citizens Information planning guidance as a starting point, then confirm with your local authority or professional advisor.

Contract Checklist

Before work starts, get a written agreement covering:

• Scope and drawings

• Price and VAT

• Payment stages

• Start date and estimated completion

• Who supplies materials

• Who coordinates plumbers, electricians, plasterers, and roofers

• Insurance

• Variations process

• Snagging and final payment

Variations are where many disputes start. Agree that changes must be written and priced before the work is done.

Building Control, Local Authority, and Consumer Paperwork

For larger projects, ask who is responsible for Building Control paperwork, engineer certificates, BER-related details, warranties, and final compliance documents. The answer should be clear before work starts, especially for extensions, structural openings, attic conversions, and renovations that may later be reviewed during a house sale.

Use Citizens Information planning guidance to understand the planning baseline, then confirm details with the relevant local authority. For disputes, deposits, or poor workmanship, Citizens Information consumer rights guidance is a useful starting point before escalating.

Red Flags

• No written quote

• No insurance proof

• Large upfront cash demand

• No recent references

• Reluctance to discuss exclusions

• Can start tomorrow on a major job with no clear reason

• Quote far below others

• Refuses to put changes in writing

Local Builder Routes

• Builders in Dublin

• Builders in Cork

• Builder trade guide

• Questions to ask before hiring a builder

Frequently Asked Questions

How many builder quotes should I get?

For significant work, get at least three quotes against the same scope. If builders price different drawings or assumptions, the numbers are not comparable.

How much deposit should a builder ask for?

There is no single rule, but large upfront deposits are risky. Payments should mostly follow completed stages, with a final retention until snagging is complete.

Should a builder manage all trades?

For extensions and renovations, a main contractor who coordinates trades can reduce stress. Confirm exactly which trades are included and which are your responsibility.

Do I need planning permission for an extension?

Some extensions are exempt, but limits apply and Building Regulations still matter. Check with your local authority or professional advisor before starting.

What is the biggest builder red flag?

No written scope. If the quote does not say what is included, excluded, and assumed, disputes are likely.

Planning work? Compare builders in Dublin, builders in Cork, or read the extension cost guide first.