Mayo · checked 29 October 2026

Window grants in Mayo

The grant is national. The homes in Mayo aren't. What SEAI's BER register and Census 2022 say about homes in Castlebar, Ballina and Westport, and what it means for new windows.

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Figures checked against seai.ie on 29 October 2026.

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43%of Mayo pre-2011 BERs pass the heat loss test

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In Mayo, 43% of BER certificates for homes built before 2011 already pass the heat loss test SEAI sets for the window grant, below the 49% for Ireland. Detached houses, on the top €4,000 rate, are 70% of homes here, against 41% nationally.

The grant itself is the same in every county: €1,500 to €4,000 for the windows by home type, plus €800 a door for up to two (seai.ie, checked 29 October 2026). We pass your request to one SEAI-registered contractor who covers Mayo.

What stands out about Mayo homes

SEAI pays the same grant in every county. The homes aren't the same. Against the national figures, these are the things that stand out in Mayo, from Castlebar, Ballina and Westport to the rest of the county:

43% of Mayo's pre-2011 BERs pass the heat loss test, against 49% nationally, the 22nd highest of the 26 counties. That's the share of homes ready for the window grant without insulating first.
Detached houses are 70% of Mayo homes, against 41% nationally (Census 2022). They get the top windows grant, €4,000, and the most glass of any home type.
Windows here are smaller than average. The median Mayo detached house has 20.4 m² of window on its BER, against 23.7 m² nationally. The grant is fixed, so it covers more of a smaller job.
Only 6% of Mayo homes were built in 2011 or later, against 8% nationally. 91% are inside the grant's 2011 cut-off on age.

Mayo and Ireland compared

	Mayo	Ireland	Rank of 26
Households, Census 2022	51,996	1,836,728
Built before 2011, inside the grant	91%	90%
Built 2011 or later	6%	8%	14th
Detached houses	70%	41%	3rd
BERs for homes built before 2011	21,451	751,700
HLI below 2.3: passes the heat loss test	43%	49%	22nd
Single glazing (U-value 4.0 or more)	7.5%	7.3%	9th
Older double glazing (2.5 to 4.0)	61%	58%	5th
BERs for grant claims per 1,000 pre-2011 homes, 2026	44.5	42.1	15th
Heating degree days a year	2,028	2,079	13th

Households and year built: CSO Census 2022 (table F2007A), councils in the county added together. BER figures: SEAI BER Research Tool, the full public file downloaded 29 October 2026: 751,700 certificates for existing homes built before 2011, leaving out the BERs done for grant claims. Degree days near Castlebar: our sum from Met Éireann's 1991–2020 grid. Ranks are ours, 1st being the highest.

Next door, the share of pre-2011 BERs that pass the heat loss test: Sligo 53%, Roscommon 40%, Galway 53%. All 26 counties side by side.

The heat loss test in Mayo

SEAI only pays for windows in a home that holds its heat. After the work, the BER advisory report must show Good or Very Good heat loss. An HLI below 2.3 on your current BER, or roof and walls rated Good, already meets it (seai.ie). Of the 6,667 Mayo certificates for homes built before 2011 that show an HLI, 43% are below 2.3 and the median is 2.43.

Home type	Median HLI, Mayo	Ireland	The median home
Detached house	2.79	2.65	2.3 or more: insulate first
Semi-D	2.22	2.35	Below 2.3: passes
End of terrace	2.32	2.45	2.3 or more: insulate first
Mid-terrace	2.17	2.30	Below 2.3: passes
Apartment	1.96	1.88	Below 2.3: passes

W/K/m², BER certificates for homes built before 2011 that show an HLI. Below 2.3 meets the heat loss test. Source: SEAI's BER register, as above. Our medians.

In Mayo the median detached house and end of terrace all sit at or above 2.3, so a typical one needs attic or wall insulation before SEAI pays for windows. The median semi-D, mid-terrace and apartment are already below it. Compared with Ireland as a whole, more Mayo homes need that work first.

Wall and attic insulation have their own SEAI grants, and a previous SEAI insulation grant also counts towards showing the home is insulated (SEAI, 20 Feb 2026). Our sister sites cover cavity wall insulation in Mayo and external wall insulation in Mayo. How to read your own BER: window grant eligibility.

The windows on Mayo BERs

The grant is for replacing single-glazed and older double-glazed windows. On Mayo's BER certificates for homes built before 2011, 7.5% show single glazing and 61% older double glazing. In homes built before 1978 the single glazing share is 18%, against 17% nationally (SEAI's BER register).

Glazing on the BER (U-value)	Mayo	Ireland
Single glazing (4.0 or more)	7.5%	7.3%
Older double glazing (2.5 to 4.0)	61%	58%
Newer double glazing (1.6 to 2.5)	28%	30%
1.6 or better	4%	5%

Source: SEAI's BER register, as above. Bands are ours.

The size of the job is the glass. SEAI's grant is fixed by home type, so the more window a house has, the more of the bill is left to you. Of Mayo houses built before 2011, the commonest type is the detached house (Census 2022). On BERs the median detached house has 20.4 m² of window, against 23.7 m² nationally, so the fixed grant covers more of the job. SEAI publishes its median costs nationally, not by county: a windows upgrade on a semi-D cost a median €7,110 from January to June 2026, and on a detached house €10,453 (SEAI's median costs PDF).

Home type	Window area, Mayo	Ireland
Detached house	20.4 m²	23.7 m²
Semi-D	14.9 m²	17.0 m²
End of terrace	11.9 m²	13.7 m²
Mid-terrace	11.3 m²	12.5 m²
Apartment	8.6 m²	9.2 m²

Median window area recorded on BER certificates for Mayo homes built before 2011: SEAI's BER register, as above. Our medians.

Heating, weather and grant claims in Mayo

The grant doesn't depend on the fuel, but the fuel prices the heat a window loses. 61% of Mayo households heat mainly with oil (CSO Census 2022), and SEAI's fuel cost comparison of 1 July 2026 puts heating oil at 12.6c per kWh, VAT included (SEAI). Electricity, at 34.38c, costs more than twice as much per unit of heat as oil or gas. Coal, peat or wood heats 22% of Mayo homes, against 9% nationally.

Main central heating	Mayo	Ireland
Oil	61%	39%
Natural gas	3%	33%
Electricity	8%	12%
Coal, peat or wood	22%	9%

Share of all households, including those that didn't state a fuel: CSO Census 2022, table SAP2022T6T5CTY.

Castlebar has about 2,028 heating degree days a year on Met Éireann's 1991–2020 averages, against 2,079 for Ireland (our sum, base 15.5°C). The heat a window loses rises in step with that number.

Every SEAI home grant needs a BER after the work, so the BERs done for grant claims track finished grant jobs of every kind. In Mayo there were 1,614 in 2024, 2,034 in 2025 and 2,118 in 2026 up to 29 October: 44.5 per 1,000 homes built before 2011, against 42.1 nationally (SEAI's BER register). SEAI received over 7,000 windows and doors applications nationally in the first three months of the grant (SEAI).

The window grant by home type

The grant is the same in Mayo as in every other county: a fixed amount for the windows by home type, whatever the number of windows, plus €800 for each external door, up to two.

Home type	Windows grant	Doors (up to two)	Most you can get
Detached house	€4,000	€800 each	€5,600
Semi-D or end of terrace	€3,000	€800 each	€4,600
Mid-terrace	€1,800	€800 each	€3,400
Apartment	€1,500	€800 each	€3,100

Source: SEAI windows and doors grant, checked 29 October 2026.

What's left after the grant, on SEAI's national median costs for January to June 2026. No county medians are published, so none are given here:

Home type	SEAI median cost, windows	Windows grant	Typical cost after grant
Detached house	€10,453	€4,000	€6,453
Semi-D or end of terrace	€7,110	€3,000	€4,110
Mid-terrace	€4,650	€1,800	€2,850
Apartment	€4,196	€1,500	€2,696

Costs: SEAI median costs, January to June 2026, from SEAI's median costs PDF (a sample of 23,412 completed upgrades; the cost each contractor submitted to SEAI at grant payment; VAT status not stated on the PDF), read 29 October 2026. Grants: seai.ie, checked 29 October 2026.

A home built and occupied before 2011, with an MPRN
Single or older double glazing being replaced
Good or Very Good heat loss on the BER after the work
An SEAI-registered contractor, and SEAI's approval before work starts

The rules in full: SEAI window grant, door grant, how to apply and One Stop Shop or apply yourself. Over 66? Your council's grant is on window grants over 66.

FAQ

Mayo questions

Is the window grant different in Mayo?

No. SEAI pays the same fixed amounts in every county: €1,500 to €4,000 for windows by home type, plus €800 a door, up to two. What differs is the homes: 43% of Mayo's pre-2011 BERs already pass the heat loss test, against 49% nationally.

How many Mayo homes pass the heat loss test?

43% of BER certificates for Mayo homes built before 2011 that show an HLI are below 2.3, the 22nd highest share of the 26 counties. The median is 2.43. The median detached house and end of terrace is at or above 2.3.

How many Mayo homes still have single glazing?

7.5% of BERs for Mayo homes built before 2011 show single glazing, and 61% older double glazing with a U-value of 2.5 or worse. Both count for the grant.

How many Mayo homes are too new for the grant?

Census 2022 counted 3,325 Mayo households in homes built in 2011 or later, 6% of the total. SEAI's windows grant is only for homes built and occupied before 2011.

Who will ring me in Mayo?

One SEAI-registered contractor who covers Mayo. They look at the windows and doors, ask about your BER and give you a written price. Nothing is booked until you say yes, and SEAI approves the grant before any work starts.

Where these numbers come from (9 public sources, checked 29 October 2026)