Quick answer
- A mortgage top-up with FHS should be checked before you rely on it.
- Purpose matters: not every extra-borrowing reason is treated the same.
- Using a top-up to redeem FHS can make sense, but the valuation-based redemption amount must be understood first.
On this page
What a mortgage top-up means with FHS
A mortgage top-up is extra borrowing secured on your home after the original mortgage has been drawn down. With the First Home Scheme, a top-up is not just a normal lender decision. FHS has an interest in the property, so the purpose of the borrowing and your remaining equity position can matter.
This is especially important if you want to borrow for home improvements, education, medical costs, or to buy back part or all of the FHS equity share.
Top-up purpose guide
| Top-up purpose | Why it may be considered | Extra checks |
|---|---|---|
| Home improvements | Can improve or maintain the home that FHS supported. | Check lender approval, cost evidence and FHS no-objection requirements. |
| Medical needs | May be allowed where the borrowing purpose is clearly documented. | Keep documents and do not rely on a verbal assumption. |
| Education needs | Can be an acceptable purpose in specific circumstances. | Confirm before applying for the top-up. |
| Redeeming FHS equity | Can help buy back part or all of the FHS share. | Requires an FHS-approved full valuation and a no-objection letter. |
| General spending | May not fit the scheme purpose rules. | Higher risk of objection. |
The 10% equity idea in plain English
One important check is whether you keep enough equity in your home after the top-up. In simple terms, the scheme does not want the homeowner’s remaining interest to be squeezed too far by extra borrowing while FHS still has a share.
Example: if the estimated open market value is €420,000, 10% equity is €42,000. Before taking extra borrowing, the homeowner should check whether the proposed mortgage, FHS share and other security position still leave enough homeowner equity after the top-up.
Process before applying for a top-up
- Write down the purpose. Be specific: home improvement, medical, education, or redemption.
- Ask the lender if the top-up is available. Your income and mortgage affordability still matter.
- Choose the correct notification route. New Build and Tenant Home Purchase customers notify FHS when applying. Self-build cost overruns are notified after completion; see the route table below.
- Check valuation needs. A top-up to redeem FHS equity requires a full FHS-approved valuation and a no-objection letter confirming the redemption amount.
- Do the full affordability check. A bigger mortgage can reduce cash pressure today but increase long-term repayments.
Common mistakes
- Assuming any top-up purpose will be acceptable.
- Starting home improvement work before finance and FHS no-objection steps are clear.
- Using a top-up to redeem FHS without understanding the valuation-based redemption amount.
- Ignoring the effect of higher mortgage repayments.
- Forgetting that a mortgage switch plus extra borrowing can create both switching and top-up questions.
Worked top-up example: how much homeowner equity remains?
Assume a completed New Build purchase, more than six months after FHS drawdown, with a current planning valuation of €420,000, an outstanding mortgage of €300,000 and a remaining FHS share of 10%. There are no other secured debts, accrued service charges or financed fees in this example. Do not assume proposed improvements have already increased the valuation.
At this valuation the FHS interest is €420,000 × 10% = €42,000. For a top-up that does not redeem any FHS equity, a simplified planning calculation is:
Retained homeowner equity = current property value − mortgage after top-up − current value of the remaining FHS share.
Retained percentage = retained homeowner equity ÷ current property value × 100.
| Planning figure | Before top-up | €25,000 improvements | €40,000 improvements |
|---|---|---|---|
| Outstanding mortgage after borrowing | €300,000 | €325,000 | €340,000 |
| Remaining FHS interest at current value | €42,000 | €42,000 | €42,000 |
| Retained homeowner equity | €78,000 | €53,000 | €38,000 |
| Retained percentage | 18.57% | 12.62% | 9.05% |
| Compared with the 10% condition | Above | Above | Below |
The €25,000 case leaves €420,000 − €325,000 − €42,000 = €53,000, above the €42,000 corresponding to 10%. The €40,000 case falls short. Ignoring the FHS interest and subtracting only the mortgage would overstate the homeowner’s equity.
Under these simplified assumptions, the retained-equity constraint leaves €36,000 of room: €420,000 − €300,000 − €42,000 − €42,000. This is not an approved borrowing limit. FHS assesses the retained interest, and the participating lender separately checks affordability, security and its top-up criteria. Charges, fees, other debts and the accepted valuation can reduce the amount available. See the official purpose and retained-equity conditions.
What if the top-up buys back all the FHS share?
Use a different end position. Assume an FHS-confirmed valuation and redemption quote of €42,000, with no accrued service charges, and an approved €42,000 top-up paid entirely to complete full redemption. The mortgage becomes €342,000 and the remaining FHS share becomes zero. Homeowner equity is €420,000 − €342,000 = €78,000 (18.57%).
Do not subtract the old €42,000 FHS share again after it has been fully redeemed. Here the funding has changed from shared equity to mortgage debt; no extra homeowner equity has been created. For a partial redemption, use the remaining FHS share confirmed in the quote. Extra service charges or financed fees need separate allowance. Read the FHS redemption guide and obtain the actual quote before committing.
Check the larger mortgage repayment
For an illustrative capital-and-interest mortgage at 4% over 20 remaining years, €300,000 is about €1,817.94 per month and €325,000 about €1,969.44: approximately €151.50 more monthly. This assumes the whole balance uses the same rate and term. An actual top-up can have a separate rate or term; compare the lender’s offer. Insurance, fees and FHS service charges are excluded.
Use the Mortgage Repayment Calculator to compare balances and terms. It estimates repayments; it does not approve a top-up or assess FHS retained-equity compliance.
Which top-up notification route applies?
| Route | When and what to do |
|---|---|
| New Build or Tenant Home Purchase | Notify FHS when applying for the top-up. Use the customer-portal notification form and provide requested evidence, such as a valuation and mortgage statement. FHS assesses the purpose and retained interest; pass its objection or no-objection letter to your lender. |
| Top-up to redeem FHS equity | FHS requires a no-objection letter and a full valuation by an FHS-approved valuer to confirm the redemption amount to the lender. Coordinate the redemption request, loan and payment. |
| Self-build cost overrun | The specific overrun route does not require notice when applying for the top-up. Notify FHS after the build is complete so it can adjust the FHS and site percentages. This exception is not a blanket rule for every self-build top-up. |
Check the current FHS top-up procedure. If switching lender as well, follow the separate switching guide.
Self-build overruns need a different calculation
FHS does not extend its facility to finance cost overruns. Arrange funding separately. On completion, use the portal’s Self-build Cost Overrun Notification form, with cost evidence signed off by your registered quantity surveyor, engineer or architect and evidence of the lender top-up. See the official self-build overrun guidance.
Do not reuse the whole-property 10% FHS value in the purchase example above for a self-build. The site treatment and any revised percentages affect the FHS interest. Obtain the scheme’s confirmed figures first.
Frequently asked questions
Can I get a mortgage top-up after using FHS?
You can apply to a participating lender, subject to its criteria and FHS requirements. New Build and Tenant Home Purchase customers notify FHS when applying; the specific self-build cost-overrun route requires notice after completion.
What purposes are usually safer for a top-up?
Home improvements, medical needs, education needs and buying back the FHS share are the main purposes to check first.
Can FHS object to a top-up?
Yes. FHS may object if the purpose does not fit the scheme rules or if the homeowner's remaining equity position is too low after the top-up.
Can I use a top-up to buy back the FHS share?
Yes. For a top-up to redeem FHS equity, obtain the scheme’s no-objection letter and a full FHS-approved valuation so the redemption amount can be confirmed to your lender.
Do I need a valuation for a top-up?
FHS can request valuation evidence for its assessment. A top-up to redeem part or all of the FHS share requires a full valuation by an FHS-approved valuer.
Is a top-up the same as switching mortgage?
No. But a switch can include extra borrowing, so both sets of rules may need to be checked together.
Sources & references
Related calculators
Use these tools for the numbers behind this guide.