Energy rating FtoEnergy rating B: detached, 1971–1980
3,012 homes of this kind are rated F. Bringing one up to a B costs about €47,500, of which the grants cover €23,000 — so you pay €17,900 – €23,700.
Check your own home
Your cert may say B2 — that's a B on the new scale.
A heat pump runs on electricity. Pick "Heat pump" if you have one.
A 1970s–80s detached house on oil, rated CEnergy rating C
- Grants you’d get
- €10,300
- It costs about
- €19,000
- You pay
- €5,000 – €8,900
- Saves you each year
- about €760
- Pays for itself in
- about 15 years
The commonest home on file — 24,045 like it. Change an answer above for yours.
Modelled, not observed payments. Middle case €8,930; a quarter of these homes are over €13,884. Repaid in 15.1–16.7 years. Confidence 0.9.
Show what’s included
This is the job list that suits most homes like yours (2 in 10). The money above is the middle of every route we priced, so it will not add up to this list exactly.
Solar panels — on the roof, one day, no disruption. Cuts the electricity bill, and pairs well with a heat pump.
2.4 kWp ≈ 2,040 kWh/yr. Cost €9,400 · grant up to €1,800 · you pay €7,600.
Costs about €10,700 · grant €1,800 · you pay €8,900
The paperwork — assessment first, grant approval, then the work, then a new energy cert, then the grant is paid. A One-Stop-Shop does all of it and takes the grant off the bill.
Order is mandatory — work started before approval is not eligible. Energy cert €276, assessment grant €350 through a One-Stop-Shop. Typically 3–6 months end to end (estimate).
Costs about €280 · grant €350 · the grant covers it
The numbers
As-is 406.51 → target 113.41 kWh/m²/yr primary energy. Wall U 1.55 → 0.37, roof 0.49 → 0.19, window 3 → 2 W/m²K. Heat pump share 0% → 23%. Middle case €23,730; a quarter of these homes are over €30,995. Repaid in 5.9–7.8 years. n=3,012, confidence 0.9. One job here has no SEAI median price, so its cost is an estimate.
Target: B = ≤150 kWh/m²/yr on the scale in force since 24 May 2026. Records folded into F: F on the pre-24-May-2026 scale. The new scale re-cut F, so only 6% of these homes would still be shown a F today; the rest read as G. Stricter B2-equivalent target (≤125 kWh/m²/yr): you pay €23,851, repaid in 5.6 years.
What the work is
Attic insulation — a thicker blanket in the roof space. Half a day, nobody moves out, you lose some storage height.
Roof U-value → 0.16 W/m²K (≈300 mm). Cost €2,000 · grant €1,500 · you pay €500.
Costs about €2,500 · grant €2,000 · you pay €520
Wall insulation — the walls get a warm coat: pumped into the cavity (a morning), fitted inside (rooms shrink about 10 cm, redecorate, one to two weeks) or wrapped outside (scaffolding, new render, two to four weeks). We pick what your walls allow.
Cavity → 0.55, €1,550 · grant €1,300 · pay €250. Internal → 0.27, €10,420 · €3,500 · €6,920. External → 0.21, €23,247 · €6,000 · €17,247. Pre-1970 solid walls can't take cavity fill.
Costs about €9,000 · grant €4,500 · you pay €4,500
New windows and doors — double or triple glazed, fitted a room at a time over two to three days. You need not do every window, but the grant is paid once.
Whole-window U → 1.4 W/m²K. Estimate: €490/m² of window (no SEAI median), about €9,085 on a semi-detached house. Grant €3,000 + €800/door (max 2).
Estimated at €13,700 · grant €4,000 · you pay €9,700
Heat pump — replaces the boiler, runs on electricity, pulls heat from the outside air. An outdoor unit the size of a large suitcase, bigger radiators in some rooms, three to five days. Runs cooler for longer — the house feels even, not blasted.
Air-to-water, SPF 3.5 heating / 2.5 hot water. Cost €16,832 · grant €6,500 + €4,000 (replacing oil/gas/coal) + €2,000 pipework + €700 controls = up to €13,200 · you pay from €3,632. 9.8c per kWh of heat vs gas 14.4c / oil 18.0c.
Costs about €16,500 · grant €6,500 · you pay €10,000
It saves about €4,080 a year and pays for itself in about 6 years.