Financing a site for a self-build in Ireland

Before buying a site, check that you can pay for the land, the early bills and the completed house. Work through the purchase and construction budgets together before agreeing a timetable with the seller.

The worked budget below uses invented figures to explain cash flow. It is neither a quotation nor a statement of typical Irish costs. Have your lender, solicitor and construction professional replace its assumptions with figures for your site and advise on your mortgage, legal and tax position.

Start with the whole project

Draw up one cost plan with separate lines for the site, building works, professional services, taxes, connections, finance costs and contingency. Record whether each figure is a quotation, an estimate or an unresolved item. A blank cell is a question still to answer; entering zero can hide it from the total.

Then draw up a funding plan: cash already accessible, money expected later and the mortgage amount confirmed for the project. Keep expected money separate until you know its conditions and availability date. A proposed gift, sale or refund should have its own evidence and timing rather than silently becoming part of today’s bank balance.

Use two tests. First, do total funds cover total costs? Second, does money arrive before each bill must be paid? A project can pass the first test and fail the second. Our stage payment planner helps explore the construction sequence once you have realistic stage amounts.

Can the mortgage include buying the land?

Some self-build mortgages can include the site purchase. One available mortgage typically uses the lower of the site purchase cost plus build costs or the completed valuation. That does not mean your chosen lender will finance your plot or use the same calculation.

Ask your chosen lender for a written funding sequence for the actual transaction. What can be released for completion of the purchase? What documents must be ready first? How much of your own money must be used, and when? What remains available for construction afterwards?

Take those answers to your solicitor before committing to purchase dates. Avoid relying on a conversation that confirms only the overall loan size. The date on which money becomes usable matters as much as the headline approval. Keep the purchase schedule and the build schedule together so a change to one prompts a review of the other.

Understand the valuation constraint

The Central Bank’s mortgage measures use both loan-to-income and loan-to-value limits. Broadly, these constrain borrowing relative to income and property value. They do not guarantee that a lender will offer the maximum permitted amount. Ask the lender to show the basis it is using for your application, including your buyer category and affordability assessment.

Consider an invented project with a €100,000 site and €300,000 build cost. If its completed valuation is €380,000, the lower figure under that example calculation is €380,000 rather than €400,000. That arithmetic illustrates why spending more does not automatically create an equally valuable property.

Do not turn this illustration into an assumed loan offer. Request the actual valuation, eligible costs and approved borrowing calculation. Then check whether your cash contribution still covers the difference, plus costs outside that calculation. Repeat the exercise when the design, site price or build quotation changes.

Owning land and holding cash solve different problems

If you already own the plot, ask how the lender treats it in the application and what valuation evidence it needs. If it is being transferred by family (see building on family land), ask the solicitor what must be completed and what taxes or expenses arise. Do not assume a gift is tax-free or that every lender treats gifted land identically.

Write the land value in one column and immediately spendable cash in another. Land may be relevant to security or your contribution, but a supplier still needs payment. Do not count the same contribution twice by putting the site value into both the project funding total and the cash available for initial invoices.

Make a list of bills due before the first construction release. Against each one, identify the account or confirmed advance that pays it. If the answer is “the mortgage”, add the release date and conditions. An unanswered date is a funding gap to resolve before placing the order.

Include tax and transaction costs

A site on its own is generally charged non-residential Stamp Duty. If you buy it with a connected agreement to build a house on it, residential rates apply. Ask your solicitor which applies to you. Have your solicitor establish which treatment applies to the actual arrangement.

The non-residential Stamp Duty rate is 7.5%. For a straightforward hypothetical €100,000 purchase to which that rate applies, the arithmetic is €7,500. This example assumes the relevant taxable consideration is €100,000 and no relief applies. It does not cover every transaction, VAT treatment or family transfer.

You may qualify for a refund of some of the duty, subject to the refund scheme’s conditions. Budget the upfront payment in full, then examine the refund separately with your adviser. Do not use an unconfirmed refund to fill a purchase-day shortfall. Obtain estimates for legal and registration work and early investigations as separate lines, with payment dates beside them.

A worked purchase-day cash budget

Suppose you have €70,000 in accessible savings. You propose buying a €100,000 site with a lender-confirmed €60,000 purchase advance. Assume the following invented expenses, all paid before any further construction release. These figures are chosen only to demonstrate the method.

Item	From savings
Site price less confirmed purchase advance	€40,000
Stamp Duty at the assumed 7.5% treatment	€7,500
Assumed legal and transaction expenses	€3,000
Assumed early design and investigation bills	€5,000
Total savings used	€55,500
Savings left from €70,000	€14,500

Now suppose €20,000 of construction invoices fall due before the next release. There is a €5,500 timing shortfall, even before setting aside an emergency reserve. The purchase itself can complete in this illustration, yet the planned start cannot be funded from the remaining cash.

Resolve that shortfall before committing: revise the sequence with the lender and construction professional, establish additional funds, reduce the scope or reconsider the purchase budget. Do not assume a contractor will extend credit. Keep any household emergency money outside the amount you label available for construction, and run the calculation again after each material change.

Assemble a site-specific application file

Prepare the site value, planning permission, property size, address and build costs, and appoint a solicitor. These are examples of the details one lender requires for an application; obtain your own lender’s complete checklist.

Create a shared document register with the item, responsible person, expected date and current version. Ask the solicitor and construction professional which title, access, planning and site-condition questions need investigation for this plot. Record the answers and their effect on price, programme or funding rather than treating a favourable site description as evidence.

If a cost remains provisional, give it an owner and a deadline. For example, replace “connections unknown” with a request for a site-specific quotation and the date you need it. The purpose is to make unresolved spending visible while there is still time to change the plan.

Settle these questions before committing

1. What is the complete site-and-build budget, including costs outside the mortgage calculation?
2. What valuation and income assumptions support the confirmed loan amount?
3. What money can be released for the purchase, on what date and subject to which documents?
4. How much cash remains afterwards, excluding the household reserve?
5. What bills fall due before the next construction release?
6. What tax treatment and upfront payment has the solicitor confirmed?
7. Which planning, title, access or site-cost questions remain unresolved?
8. What happens to the budget if the purchase or building programme slips?

Keep written answers with your self-build mortgage application. Add the household payments from our construction-interest guide alongside the project cash plan. The result should show a funded route from buying the plot to completing the house, with each major payment matched to money available on time.

Buying someone else’s part-built house? Use the unfinished-house purchase checks before committing to the sale.