How to compare self-build mortgages in Ireland

The right self-build mortgage needs to fund the house on the dates you must pay for it. A competitive rate matters, but so do the cash needed before a stage release, the documents needed to unlock it and the money held until completion. Compare those together before choosing a lender.

Ask lenders or a mortgage intermediary for offers based on your circumstances. The process examples below show what to check; they are neither a market survey nor a personal recommendation. A description on a lender’s website does not establish your approval.

For borrowing limits and the application file, start with getting a self-build mortgage. For the process of requesting each payment, use stage payments explained.

Check how your offer pays for the build

Before comparing rates, ask how each offer would fund your particular site and build. These are separate examples from available mortgages, not features you can assume will come together in one offer:

• Site ownership and early cash. One lender’s mortgage (call it Mortgage A) allows a secured site to serve as the deposit and pays out in four to six stages. The assigned certifier (the architect or engineer you appoint to inspect and certify the build) signs off each stage and your solicitor requests it. Ask how your site is valued, what cash you must use first and what amount becomes available at each stage.
• Site purchase and repayments. A different lender’s mortgage (Mortgage B) can include buying the site and offers nine months of interest-only repayments, subject to approval. Later repayments and the total loan cost are higher. Ask what you would pay after month nine if construction were still underway.
• The stage sequence. One published example has six stages: from site purchase through foundations, floor, roof, habitable property and post-completion. Certification and requests through the solicitor are required. Ask which stages would apply if you already owned the site and how they would match your contractor’s invoices. This mortgage also has self-build-specific funding limits alongside general buyer limits. Request the calculation for your project; a general buyer percentage or an illustrated site-purchase stage does not confirm your own funding.

Do not assume that a feature omitted from a short product description is unavailable. Request a complete written sequence for each offer you are considering.

Mortgage B also has a final-payment condition to consider. Its January 2026 guide describes a final payment, usually 10% of the loan or €15,000 if that is higher, paid only after the final valuation and compliance certification. The lender holds this money back until the house is finished. Release can follow completion by some months. Treat that as a specific product condition to discuss, rather than a retention rule for every lender.

Give each lender the same project

Prepare one application brief before comparing responses. Include the site position, planning status, intended procurement method, construction budget, professional fees, contingency, accessible savings and household commitments. Identify costs still awaiting quotations. Date the brief and record revisions so you can tell whether two offers assess the same house.

Separate money already accessible from money expected later. A gift, sale, refund or proposed additional borrowing needs its own evidence and availability date. Keep household emergency savings outside the amount you are offering to spend on construction. Otherwise an apparently comfortable comparison can rely on money you cannot safely use.

Ask each lender to mark which costs it has included in its assessment and what completed valuation it assumes. If one response supports less borrowing, find out whether the difference arises from affordability, valuation, eligible costs or incomplete information. A lower offer is a question to understand before changing your design or savings contribution.

Match releases to invoices

Create a dated schedule with four entries per stage: contractor payment, professional certification, submission to the lender and expected receipt of funds. Ask the lender which dates it can confirm and which are estimates. Discuss the sequence with your solicitor and construction professional before agreeing the building contract’s payment timetable.

Use an invented comparison to expose the issue. Suppose both offers provide a €300,000 loan. Your next invoice is €45,000 and you have €35,000 of construction cash. Under hypothetical offer A, no further money arrives until the invoiced work is certified as complete. You face a €10,000 timing shortfall. Hypothetical offer B releases €15,000 earlier under agreed conditions, leaving €50,000 available for that invoice.

These are fictional offers, not descriptions of any named lender. They show why identical total borrowing does not mean identical cash needs. Moving money earlier can also increase interest because it is outstanding longer. Compare both the ability to pay the invoice and the cost of doing so. Enter your own amounts in the stage payment planner.

Separate interest calculation from repayments

For a mortgage that follows the six-stage example above, interest applies to funds actually drawn rather than the entire approved mortgage. That alone does not establish an interest-only repayment arrangement. Ask whether monthly payments include capital, when they start and how each release changes them.

Request a schedule covering the expected build period and the months after it. Add rent, existing mortgage commitments and ordinary household spending beside those payments. If an introductory arrangement ends before your likely move-in date, model the overlap explicitly. Our interest during construction guide has worked examples of the repayments.

Ask how a fixed rate interacts with multiple releases: when the fixed period starts, what rate later releases receive and what conditions apply if the programme changes. Record the answer for your offer rather than assuming another borrower’s experience applies. Also ask what happens after the fixed period and how voluntary overpayments or early repayment are treated.

Compare cost on a consistent basis

The Competition and Consumer Protection Commission (CCPC) provides independent mortgage comparison tools and explanations of borrowing costs. Use it as a starting point, then obtain figures for the self-build arrangement actually offered. A calculator result cannot settle construction-specific release conditions.

For each offer, request the borrowing rate, annual percentage rate of charge (APRC), repayment schedule, total amount repayable and itemised fees with their assumptions. Use the same loan size and term when comparing. Identify valuation, legal, certification and account costs separately, noting which figures are estimates and which the quoted comparison includes.

Keep cashback in a separate dated line until its eligibility and payment conditions are clear. Money arriving after the last drawdown cannot pay an earlier foundation invoice. Compare a loan with an incentive against an available alternative without one over the same period, allowing for fees and any balance still outstanding. Ask for help with that calculation if the structures differ substantially.

For energy-related pricing, ask what evidence is required, when it must be supplied and what rate applies before it is accepted. Put the initial rate in the construction budget unless the lender confirms another arrangement. A target energy rating in your design should not silently become an approved discount in your cash forecast.

Check the last payment first

List what the lender requires for its final release and who produces each item. Request the amount held back, the completion definition and the expected processing sequence. Check this against the builder’s final invoice and any contractual retention; a bank’s unreleased funds and your contract’s payment arrangements need to work together.

For example, if €25,000 remains unreleased while €18,000 of final invoices fall due, identify confirmed money that pays those bills before treating the project as fully funded. The outstanding mortgage balance alone does not answer that question. Discuss mismatches early with the relevant professionals rather than relying on supplier credit.

Take this checklist to the appointment

1. What exact project, cost plan and valuation does this assessment use?
2. How are site ownership or purchase and my cash contribution treated?
3. What must I spend before the first and subsequent releases?
4. What certification, valuation and solicitor work unlocks each payment?
5. What repayments apply during construction and after any temporary arrangement?
6. What are the offer, drawdown and completion deadlines, and extension conditions?
7. What happens if costs rise, the valuation changes or the build is delayed?
8. What insurance evidence is needed, and at what point?
9. What remains held at completion, and what unlocks it?
10. What fees, incentive conditions and rate assumptions underpin the cost comparison?

Keep written answers beside the offer documents. Resolve a site-purchase question with the site finance guide, and test an emerging shortfall with the build funding gap worksheet. Choose only once the borrowing, available cash and contractor schedule form a workable route to completion.