A green mortgage enquiry should start with the property’s documented energy rating and the lender’s current product criteria. The label does not by itself show that the deal is cheaper after every fee and upgrade cost.

The structure behind the offer

A documented energy rating and current product criteria should support the enquiry. Planned works and hoped-for eligibility are not the same as accepted evidence.

Rate, fees and the cost over the chosen period

Compare offers using the same borrowing amount, valuation assumption and intended deal period. Show upfront charges and any fees added to the loan. Where terms differ, compare the remaining balance as well as payments, so a lower instalment is not mistaken for a lower total cost.

Comparison item Question to resolve
Current and planned BER evidence Which rating and certificate does the lender require?
Product criteria and total fees When must the evidence be available?
Upgrade cost and evidence timing Is the net saving positive after additional costs?

Ask for the offer assumptions to be explained in writing. A calculator or initial illustration should be kept separate from an underwritten offer and completion conditions.

The decision that deserves the closest review

Ask which BER evidence is required and whether planned improvements or only an existing rating are accepted. Compare the product’s total cost with alternatives. Budget energy upgrades independently, including timing and any verified support conditions.

Documents and assumptions to organise

Organise borrower identity, income or trading information, existing borrowing and the property documents relevant to the enquiry. Show where the deposit and transaction cash come from. Ask the lender or broker for the precise evidence list and identify outstanding legal or valuation conditions.

Check BER evidence and the whole upgrade budget

Identify the property’s documented energy rating and any planned works. Ask the provider which evidence supports its current green-product criteria. Keep proposed improvements separate from a rating already established, and budget for assessment or other steps needed to document the property’s position.

Compare the mortgage cost with upgrade, transaction and support assumptions clearly separated. Review a scenario where works finish later or support is not approved. A financing benefit should be assessed against the accepted evidence and full project budget rather than a broad promise that energy work always pays for itself.

Use current Irish lender terms and the borrower’s own transaction figures for the final comparison.

A hypothetical example

A homeowner plans work that may improve the BER. It checks when the rating must be evidenced and avoids budgeting a rate reduction before the lender has accepted eligibility.

A mistake to avoid

Assuming intended energy improvements already establish eligibility for a green product.

Completion, ongoing commitments and the next decision

List the conditions that remain before funds can be released and allow for realistic legal and valuation timing. After completion, record payments, review dates and any limits on changes to the property or borrowing. Keep a plan for the next deal expiry rather than treating the first offer as a permanent arrangement.

Questions before choosing

Does a grant guarantee green-mortgage acceptance?

No; grant conditions, energy evidence and lender criteria are separate matters.

Will planned works automatically qualify the property for a green mortgage?

Confirm the current criteria and required evidence. Intended improvements and an accepted documented rating should remain separate in the enquiry.

Sources and further reading

Research date: 6 October 2026. Refer to the current linked guidance and written provider or adviser terms when making a decision.