Cost guide · Whole house · SEAI prices Jan–Jun 2026 · our model 5 Oct 2026
A One Stop Shop retrofit of a semi-detached house cost a median €62,881
SEAI's median One Stop Shop job on a semi-detached house cost €62,881 in January to June 2026, and the homeowner paid a median €37,816 after grants (SEAI, 583 homes). Most houses need less: our model's cheapest route to a B from a C costs about €16,700 before grants. Where your house starts decides the total.
A row of bungalows under scaffolding for a whole-house renovation. Photographed in England; Irish retrofits look much the same.
Garrick Close, Kingston upon Hull: bungalow renovations, September 2023 · Hullian111 · CC BY-SA 4.0
Price your own house, job by job
Your house type and age give the jobs it needs, with every grant and what you’d pay.
About 10 seconds. See your numbers first, then get quotes if you want them.
Two published medians and two modelled routes: different kinds of number, not to be added.
€62,881
SEAI's median One Stop Shop job, semi-detached
SEAI OSS median costs · Jan–Jun 2026 · 583 homes
Published figure€37,816
What the homeowner paid after grants (median)
SEAI OSS median costs · read 10 Oct 2026
Published figure€16,741
Cheapest route to a B from a C, before grants
Our model · re-run 5 Oct 2026 · SEAI H1 2026 prices
Our model€39,400
The same from a G
Our model · 65,087 certs rated G
Our modelUpdated · grants checked · prices SEAI H1 2026 · model 5 Oct 2026 · How we know · Corrections
Where this sits · the heat chain
Heat leaves through the walls, roof, floor, windows and draughts. The heating puts it back. A BER adds it all up.
- Fabricwalls, roof, floor, windows
- Airdraughts and ventilation
- Heatheat pump or boiler, radiators, controls
- Usebills, comfort, the BER
- The idea behind itFollow the heat
- You are hereWhat a retrofit costs
- Next questionWhat order should the work go in?
What a whole-house job costs through a One Stop Shop
SEAI's medians for 583 private homes finished through One Stop Shops, January to June 2026. Published figure
A semi-detached house cost €62,881; the homeowner paid €37,816
A detached house was €66,304; an apartment €20,638.
| Home | Median works | Median grant | Median paid by the homeowner |
|---|---|---|---|
| Detached | €66,304 | €25,975 | €40,835 |
| Semi-detached | €62,881 | €23,880 | €37,816 |
| Mid-terrace | €52,099 | €20,300 | €32,238 |
| Apartment | €20,638 | €10,300 | €10,338 |
Each figure is SEAI's median for homes upgraded through a One Stop Shop in January to June 2026. The three columns are separate medians, so the grant and the homeowner's share don't add up to the works. Most of these jobs included a heat pump, windows and doors, wall insulation and ventilation.
Sources: SEAI, One Stop Shop median costs and grants, 10 Oct 2026
The grant comes off the bill before you pay. SEAI rule
They will apply and accept all SEAI grants for your project and deduct the values upfront from the cost of your works.
SEAI One Stop Shop page, 8 Oct 2026
The job has to leave the home at a B. SEAI rule
Your home must achieve a minimum post works BER of B
SEAI One Stop Shop page, 8 Oct 2026
The cheapest route to a B depends on where the house starts
Our model of the cheapest set of grant-aided jobs that gets each home to a B, at SEAI's median prices. Our model
From a C, the cheapest route to a B costs about €16,700; from a G, about €39,400
After grants, the middle home starting at a C pays €2,500; one starting at a G, €16,900.
Each bar is the middle cost, before grants, of the cheapest set of grant-aided jobs our model finds to bring a home to a B, across every kind of house that starts at that letter. Not every home gets there: from a C, 86.3% can on grant-aided jobs alone; from a G, 30.6%. It is a typical route, not a quote for your house.
Estimatefixmyber's model, re-run 5 Oct 2026 with the €14,500 heat pump grant, on SEAI's January to June 2026 median prices and BER certificates for homes sold or let. Grants are the individual-route amounts.
Sources: fixmyber model on the SEAI BER file, 8 Sep 2026 · SEAI median costs, H1 2026
The numbers
| Starts at | Middle cost | Middle half | Middle grant | You pay (middle) | Can reach B |
|---|---|---|---|---|---|
| C | €16,741 | €16,000–€17,000 | €14,500 | €2,500 | 86.3% |
| D | €28,004 | €20,165–€28,685 | €19,000 | €9,200 | 77.9% |
| E | €35,505 | €28,954–€38,185 | €21,300 | €14,200 | 66.7% |
| F | €38,185 | €37,254–€41,224 | €22,500 | €16,900 | 54.2% |
| G | €39,400 | €37,254–€42,801 | €25,000 | €16,900 | 30.6% |
What the cheapest route is made of
| Starts at | A heat pump alone | Wall insulation | New windows | Solar panels |
|---|---|---|---|---|
| Energy rating C | 93% | 1% | 0% | 5% |
| Energy rating D | 27% | 59% | 36% | 0% |
| Energy rating E | 7% | 91% | 47% | 6% |
| Energy rating F | 0% | 95% | 60% | 46% |
| Energy rating G | 0% | 99% | 76% | 64% |
Our model · the most common cheapest route for each house type and age, weighted by certificates · re-run 5 Oct 2026
Why a C is cheap to move. For 93% of homes rated C, the cheapest route our model finds is a heat pump on its own, and the grant covers most of it. From an E, 91% of routes include wall insulation.
What each job costs on its own
SEAI's median price for a semi-detached house, January to June 2026, and the grant on the individual route. Published figure
Single jobs run from €1,585 to €23,219 on a semi-detached house
Grants cover 87% of the best-funded job and 19% of the least.
| Job | SEAI median | Grant | Grant covers |
|---|---|---|---|
| Attic insulation | €2,101 | €1,500 | 71% |
| Cavity wall insulation | €1,585 | €1,300 | 82% |
| Internal wall insulation (dry lining) | €9,843 | €3,500 | 36% |
| External wall insulation | €23,219 | €6,000 | 26% |
| Windows | €7,110 | €3,000 | 42% |
| Heating controls | €3,000 | €700 | 23% |
| Heat pump (full grant) | €16,741 | €14,500 | 87% |
| Solar panels | €9,500 | €1,800 | 19% |
Each price is SEAI's median for that job on a semi-detached or end-of-terrace house, January to June 2026. The heat pump grant is the full €14,500, which needs an oil, gas, solid-fuel or storage-heater system to come out. Grants are paid after the work, and the work needs SEAI's approval first.
Sources: SEAI, Median costs of individual energy upgrades, Jan–Jun 2026, 10 Oct 2026 · SEAI grant pages, 10 Oct 2026
The two biggest jobs in detail: what a heat pump costs · what wrapping the walls costs
Doing it yourself or through a One Stop Shop? The two routes compared, by house
Questions people ask
- How much does a deep retrofit cost in Ireland?
- Through a One Stop Shop, SEAI's medians for January to June 2026 run from €20,638 for an apartment to €66,304 for a detached house, before grants. A semi-detached house was €62,881.
- How much of a retrofit do grants pay?
- On a One Stop Shop job on a semi-detached house, the median grant was €23,880 and the median homeowner paid €37,816. On single jobs, grants cover from 19% to 87% of SEAI's median price.
- Can I borrow for a retrofit?
- The Home Energy Upgrade Loan lends €5,000 to €75,000 over up to 10 years, but only for work done through a One Stop Shop or community coordinator, and it closes to new loans on 31 December 2026 unless it runs out sooner.
- Is it cheaper to do one job at a time?
- It can be, if the house needs only a job or two. A One Stop Shop has grants for more jobs, such as floors, ventilation and airtightness, takes the grant off the bill and manages the work, but charges for doing so.
How we know
- One Stop Shop costs: SEAI's median costs and grants for 583 private homes, January to June 2026, read 10 Oct 2026, each figure checked against our saved copy.
- Single jobs: SEAI's median costs of individual energy upgrades, January to June 2026. A median is a middle price, not a quote.
- Routes to a B: Our model, re-run 5 Oct 2026: for each kind of home on SEAI's BER file, the cheapest set of grant-aided jobs that reaches a B, priced at SEAI's January to June 2026 medians. Labelled Our model.
- Grants: SEAI's grant pages, read 10 Oct 2026.
Sources
SEAI OSS median costs and grants, 10 Oct 2026 · SEAI median costs of individual upgrades, 10 Oct 2026 · SEAI Home Energy Upgrade Loan, 8 Oct 2026 · SBCI Home Energy Upgrade Loan Scheme, 10 Oct 2026
Found a mistake? Every fix is dated on Corrections. Method in full: How we know.
See your grants and what you’d pay
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Updated · grants checked · prices SEAI H1 2026 · model 5 Oct 2026 · How we know · Corrections