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For more information on this release:
E-mail: environment@cso.ie Berna Lawlor (+353) 1 4984210 Sheona Gilsenan (+353) 1 4984202
For general information on CSO statistics:
information@cso.ie (+353) 21 453 5000 On-line ISSN 2009-7441
CSO statistical release, , 11am

Domestic Building Energy Ratings

Quarter 2 2016

% of column
Period of constructionEnergy rating
ABCDEF-G
1700-19771915305079
1978-199901332453416
2000-20040132917114
2005-200975724851
2010-20169280000

92% of "A" rated dwellings were built since 2010

Figure 1 BER grade by period of construction
go to full release

92% of "A" rated dwellings were constructed in 2010 or more recently, while 79% of dwellings rated "F" or "G" were constructed prior to 1978.

In the second quarter of 2016 a total of 23,079 Building Energy Rating (BER) audits were conducted on dwellings, bringing the cumulative total of BER audits conducted since January 2009 to 681,059 (see Table 1).


Just 2% of the BER audits conducted were on dwellings constructed after the introduction of the BER legistlation in 2009. (see Table 2).

Dwellings that used Wood Pellets for main space heating type were most likely to be "A" or "B" rated (43%). Peat fuelled dwellings had the highest proportion of "F" and "G" rated properties (59%) but overall represented only 1,383 dwellings. Dwellings that used Coal, Smokeless Fuel, Peat or Solid Multi-Fuel had the lowest percentage of "A" rated properties, 0%. The majority of dwellings are either using Oil or Mains Gas for their main heating purposes (39% each) (see Table 6).

ABCDEFG
Mains Gas2174422942
Heating Oil094328111633
Electricity2316312222
Solid Fuel024192755
LPG12451165818

Apartments and Maisonettes comprised 27% of the dwellings audited since the beginning of BER audits . In this category the least efficient in terms of energy use were basement dwellings with one third of these having a "G" rating (33%). (see Table 3).

Dublin County has the highest percentage of "A" rated properties in the country (5%) with Kildare (3%) and Wicklow (2%) following, while Roscommon has the highest percentage of "G" rated dwellings in those dwellings audited in the county (12%). (see Table 4).

A breakdown of dwellings audited in Dublin City shows that Dublin 15 has the highest proportion of "A" rated dwellings and also the lowest average age of a property at 17 years. (see Table 5)

 The county with the highest percentage of solid fuel usage was Offaly (26%). Solid fuel was the main space heating type in 6% of BER audited dwellings country-wide. Donegal had the highest proportion of dwellings using heating oil (81%). Dublin City used home heating oil least with 6% of dwellings followed by Cork City with 10% and Dublin County with 12%. (see Table 8).

ABCDEFG
Carlow11040261157
Cavan01143211158
Clare0838271458
Cork City11336241358
Cork County1164121947
Donegal0943241158
Dublin 01-2411331261477
Dublin County51536241044
Galway City0735331465
Galway County0940251258
Kerry11137261258
Kildare31241261045
Kilkenny01038261259
Laois11239221269
Leitrim08392312711
Limerick City1540291267
Limerick County1840281257
Longford01035261379
Louth1144223946
Mayo17372712610
Meath2124523945
Monaghan11236271258
Offaly06332218911
Roscommon07412312612
Sligo1934261569
Tipperary06352714711
Waterford City1838311246
Waterford County1938291156
Westmeath010372512610
Wexford1738281358
Wicklow21135251368
National11137251257

In dwellings that have had more than one assessment carried out, 22% of dwellings originally had an "F" or "G" rating. In the latest assessment carried out just 5% of these had a "G" rating. In the earliest assessment only 6% had a rating of "A" or "B" while in the latest assessment 17% of dwellings achieved an "A" or "B" rating (see Table 14).

Earliest yearLatest year
A-B617
C2747
D2722
E189
F-G225
Table 1 Domestic Building Energy Ratings Certificates 1
         number
Period20092010201120122013201420152016Total
January4,1014,6698,5636,5236,9677,0026,5195,33349,677
February6,3205,6149,0196,3048,5247,5407,6576,99257,970
March8,7656,1528,9376,5078,2068,3817,2607,65861,866
April8,0345,4857,7794,4388,2978,7327,5877,49657,848
May7,9265,4768,8715,8728,6468,7287,7148,03861,271
June8,7285,7377,4594,8667,2618,2188,0007,54557,814
July8,7765,9727,2535,5357,0969,3937,676 51,701
August7,2706,4577,5315,0476,9738,1647,649 49,091
September7,5197,4248,8704,9768,2819,9138,358 55,341
October6,5938,4029,5706,6868,98010,7729,222 60,225
November6,97511,6179,6238,8209,60910,9108,420 65,974
December6,3488,0429,4836,3686,9407,7867,314 52,281
         
Total87,35581,047102,95871,94295,780105,53993,37643,062681,059
          
1 Includes all Certificates for Dwellings 
Table 2 BER Ratings by Period of Construction
             % of row
Period of ConstructionEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
1700-18990012234710910143816,098
1900-19290012234710910143833,265
1930-194900134579131010142630,514
1950-1966001256812141111131847,734
1967-19770013691216171199863,724
1978-198200138121518181065343,702
1983-19930014812152018954371,849
1994-19990014915192115754276,731
2000-200400171521211595321115,632
2005-200913112123179642110113,922
2010-2016542212721110000014,383
               
Total113711131313127557627,554
               
Table 3 BER Ratings by Type of Dwelling
            % of row 
Dwelling TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Apartment14111312710101065564,425
Ground-floor apartment113810101012141086736,033
Mid-floor apartment151112111212129533343,855
Top-floor apartment11491099121510761037,192
Basement Dwelling  23627791310933175
Maisonette12711131010111364476,369
House12391214141311544838,362
Detached house1127111314131265610163,862
Semi-detached house211510151616127555162,796
End of terrace house21151013131312767944,859
Mid-terrace house11281313111211766889,626
               
Total113711131313127557627,554
               
Table 4 BER Ratings by County
            % of row 
CountyEnergy Rating Average age
AB1B2B3C1C2C3D1D2E1E2FGTotal
Carlow1127121414151165578,95028
Dublin 01-24124710111113138777139,04536
Dublin County52481113131311654444,20928
Kildare31381214151511644524,09624
Kilkenny01271213131412755910,73334
Laois112810151412966699,94728
Longford0127111212151176795,60726
Louth12381415141310644616,72931
Meath2138141615139544519,15525
Offaly0114812121111999118,43433
Westmeath013710121514116561011,98329
Wexford1125914151513855821,01627
Wicklow21371112121312766817,36332
Clare0016913151513865817,86731
Cork City11481212121312755814,16742
Cork County124111514121110544757,52231
Kerry11371113131412755821,10428
Limerick City10141214151514756710,18435
Limerick County10261114151514755720,02031
Tipperary01149121314138671121,46838
Waterford City1125101315171475466,46735
Waterford County11261113141513745610,63833
Galway City012471216181586658,75025
Galway County01261114151412765827,87227
Leitrim00261214131211667114,78030
Mayo11258131614137561016,90130
Roscommon00151114151211756127,38230
Sligo1127912131413966910,75829
Cavan012815161312965589,55426
Donegal01261315141311655818,46327
Monaghan1138121112141375586,39034
                
Total113711131313127557627,55431
                
Table 5 BER Ratings by Dublin Postal District
% of row  
CountyEnergy Rating Average age
AB1B2B3C1C2C3D1D2E1E2FGTotal
Dublin 1226791011131396576,32829
Dublin 2147681012131296673,48635
Dublin 31025789111210911145,95654
Dublin 411479910131497887,76442
Dublin 5012579111614109865,76742
Dublin 61134668111310910166,27056
Dublin 6W212788913138910103,20149
Dublin 700126981214101011178,13755
Dublin 8036878912138781110,24942
Dublin 9203689101214109997,06945
Dublin 10  24131613121176772,62541
Dublin 111281212111211965557,80729
Dublin 1201346791214101012126,41751
Dublin 1331412111111131176544,44229
Dublin 1413689910121397766,62237
Dublin 15525101315141511522113,82517
Dublin 163158111313151475425,90427
Dublin 17217914201414842213,52924
Dublin 183711161612109832217,02917
Dublin 20 49108891313117541,55030
Dublin 220014813141819106434,66426
Dublin 2411251215151614864210,40221
                
Total124710111113138777139,04536
                
               
Table 6 BER Ratings by Main Space Heating Fuel
% of row 
Fuel TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Mains Gas2251015151413105442241,049
Bulk LPG126172118139632119,105
Bottled LPG0138121512121454510801
Heating Oil012612151616126555243,502
Electricity2111358141712981889,697
Coal  00011413151418353,553
Smokeless Fuel 0 0001313161418354,073
Peat 0  011310131316421,383
Wood Pellets & Chips3613221314106432221,179
Wood Logs32232349139101032573
Solid Multi-Fuel00000127141414163324,909
               
Total113711131313127557619,824
               
Table 7 BER Ratings by Main Water Heating Fuel
% of row 
Fuel TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Mains Gas2251115161413105442239,562
Bulk LPG126172118139632119,051
Bottled LPG003813151410145459857
Heating Oil012612151616126555241,684
Electricity2111358131712982094,490
Coal0001112514151518273,420
Smokeless Fuel   0011414181520273,717
Peat   0011411131316401,418
Wood Pellets & Chips3613221314106432311,181
Wood Logs22233351013991028524
Solid Multi-Fuel00000128141514162923,920
               
Total113711131313127557619,824
               
Table 8 Main Space Heating Fuel by County
% of row 
CountyFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
Carlow364610628,943
Dublin 01-247362110134,319
Dublin County7712101043,425
Kildare4738103123,990
Kilkenny305289210,686
Laois314571619,923
Longford262191435,544
Louth553653116,541
Meath424583119,147
Offaly95592518,334
Westmeath15531514311,942
Wexford1691512320,915
Wicklow434195117,269
Clare12601412317,830
Cork City7210162014,033
Cork County4041134257,149
Kerry1651910521,012
Limerick City5520204010,052
Limerick County2848149119,939
Tipperary1365812121,400
Waterford City611421306,451
Waterford County2453147210,585
Galway City164235528,674
Galway County766167327,794
Leitrim066161364,778
Mayo372139316,866
Roscommon37311947,381
Sligo162229510,740
Cavan96910849,485
Donegal08196418,324
Monaghan8738836,353
       
Total39391462619,824
       
Table 9 Main Space Heating Fuel by Period of Construction
% of row 
Period of ConstructionFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
1700-189929382210115,686
1900-192931391910132,801
1930-19494238910130,455
1950-1966454167147,591
1967-1977385147163,143
1978-1982355248143,505
1983-19933446118271,421
1994-19993338225176,228
2000-200438362042114,862
2005-200947291824110,582
2010-20165920181213,550
       
Total39391462619,824
       
Table 10 Main Space Heating Fuel by Type of Dwelling
% of row 
Dwelling TypeFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
Apartment46447124,169
Ground-floor apartment477431234,469
Mid-floor apartment401581140,619
Top-floor apartment423531235,475
Basement Dwelling2886121158
Maisonette52736236,288
House187055338,342
Detached house1571562163,726
Semi-detached house4740481162,580
End of terrace house592587144,698
Mid-terrace house602297189,300
       
Total39391462619,824
       
Table 11 Average Floor Area by Period of Construction and Type of Dwelling
m2
PeriodApartmentGround-floor apartmentMid-floor apartmentTop-floor apartmentBasement DwellingMaisonetteHouseDetached houseSemi-detached house End of terrace houseMid-terrace houseAll dwelling types
1700-18996953455654105148159145115106118
1900-19296451445343891191241209790100
1930-1949526045515275110120109848297
1950-19667064535558631161251138886104
1967-197766645954110621321391088484109
1978-19826364635410066137142968482109
1983-1993585855575871146149958280108
1994-19996763586761771521611018383110
2000-20047470697761891661771039591114
2005-200981727278959616919010610097110
2010-20168178737686105193209124122113140
             
All7667667059861471561049188110
             
Table 12 Average Primary Energy Use by Period of Construction and Type of Dwelling
           kWh/m2/year
PeriodApartmentGround-floor apartmentMid-floor apartmentTop-floor apartmentBasement DwellingMaisonetteHouseDetached houseSemi-detached house End of terrace houseMid-terrace houseAll dwelling types
1700-1899436425391492392472417411389421369404
1900-1929475429444507376448415420390426381410
1930-1949367353284423485449377402350377331367
1950-1966418334301396515310338355311343305329
1967-1977386322268375311333291299285284258288
1978-1982333290247296309302246253258247225251
1983-1993345305256302314281229234248250227241
1994-1999283282242284264262208209232254230226
2000-2004253244208244307215189193215222196207
2005-2009170189162193186164152163176171157168
2010-201612310483106132871008771747382
             
All222252201260332232234244244265255244
             
Table 13 Average Carbon Dioxide Emissions by Period of Construction and Type of Dwelling
          kgCO2/m2/year
PeriodApartmentGround-floor apartmentMid-floor apartmentTop-floor apartmentBasement DwellingMaisonetteHouseDetached houseSemi-detached house End of terrace houseMid-terrace houseAll dwelling types
1700-18991029686112831111071069410187100
1900-19291139899114821071071109410289101
1930-1949858161931071049610483887789
1950-19669975648611366859071786978
1967-1977927257817777737466676069
1978-1982806653657771616362575261
1983-1993836957686964575858585258
1994-1999666454645958515154595253
2000-2004585346536746464750494348
2005-2009364034413634363941383438
2010-2016252216213017232015151518
             
All505643577251586157615858
             
Table 14 Dwellings with Multiple BER Ratings
% of total 
Earliest YearLatest YearTotal
A2A3B1B2B3C1C2C3D1D2E1E2FG
A1    0         0
A20    0        0
A300000         0
B1 0000000 0    0
B20 000000000 0 1
B3 000210000000 4
C1 00023100000007
C2 00013210000009
C3 000123210000011
D1 000123321000013
D20000122232100014
E10000111122100010
E2000011111211008
F000011111111109
G0000111111111213
                
Total00141217161412105332100
                
Table 15 BER Ratings Weighted to National Level
% of row
Dwelling TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Apartment126911111011127659164,441
Detached house1127101213131265611675,807
Semi-detached house11159131516137666434,444
Terraced house1115101212131287810262,710
               
Total1126101213131276691,537,403
               
Table 16 BER Ratings by Eircode Routing Key (only includes dwellings pre-assigned an Eircode)
       
Eircode Routing KeyEnergy Rating (%)Number of BER Dwellings with an EircodeMedian Age (years)Number of 2011 Census Dwellings with an Eircode
A-BC-DE-G
A4159365392394
A4242526939857
A4558376711496
A631860222,7511810,871
A671058321,7701810,468
A75127019667126,596
A81176716591155,848
A821471162,0421020,778
A8324687517105,377
A842564111,129104,944
A8512826936116,185
A86127810560143,252
A911469175,1022327,223
A921471156,4471335,428
A941355325,3303420,227
A961453336,3143621,303
A98960313,1322816,074
C151373154,6061228,199
D011258303,4481614,466
D021157312,024208,141
D03644504,0256417,070
D041057335,7122920,216
D05658374,1984319,507
D061143464,1423519,993
D6W1054362,7614710,947
D07448496,2655725,715
D081346416,2694827,504
D091052395,0114822,427
D10665292,137417,780
D111858245,7073123,778
D12846465,1745122,588
D132159204,8692820,848
D141354334,6444016,829
D1517731010,8251838,389
D161863194,8292619,727
D17682122,242317,008
D182862106,3251920,900
D2046036863374,619
D221367213,9752417,219
D241468188,6562036,055
E2186726493334,688
E2586824587275,023
E3247125790336,027
E3426136983408,661
E41460362,0243016,385
E451066251,8042711,226
E5385735830285,274
E91768252,3283314,982
F121074161,0681615,396
F23582131,6351911,044
F26769252,3272222,339
F281362261,0682113,030
F31115930278183,312
F3517722300163,946
F4287121754179,384
F45377207101612,237
F52176716567186,207
F56157113424124,568
F911062275,2012428,841
F92877143,3271930,129
F931174152,6131930,647
F941268201,4102023,662
H121269191,6641713,192
H1477617414164,755
H16186716177212,905
H181066241,1272811,404
H2326038241541,716
H53666291,2532314,545
H54673211,2771712,034
H6268113824166,592
H6513798761135,358
H7125939280152,755
H917742012,9472170,566
K32187392,6631610,948
K34117019996304,416
K362265132,6502010,451
K456886509163,061
K5615769669193,549
K671078123,5701816,905
K78217094,3691616,551
N371065263,2362618,150
N391266222,8391720,212
N41874181,3641614,207
N911266223,8122124,277
P12236413498237,473
P1424532438361,101
P17155827791285,479
P241661221,152295,962
P252070112,5401912,628
P312268102,221188,427
P327732015391,423
P361259281,100217,634
P431772112,210209,047
P47234729304285,214
P512362163,1562130,289
P56157114493205,309
P61177013950256,726
P67127216453273,742
P72196615852277,369
P7596130655288,877
P81115830715309,606
P85106327562296,171
R14975161,715239,356
R2187022274273,408
R321662214,7932129,744
R35661332,2632715,418
R4245344980279,331
R4555935658263,844
R5147422932236,329
R5697319589264,169
R931171184,2792221,978
R951168204,8492829,921
T1215622213,3263652,685
T231265248,0404331,254
T3450491135121,185
T45266952,150157,795
T5633653286102,242
V14773201,386304,233
V1545838720268,128
V23186221255255,436
V3186329862239,458
V351151388372310,791
V4267420895196,194
V92866254,3592632,027
V931170192,8962026,572
V946751916,3203076,638
V95772215,6042132,935
W121173161,951209,351
W231669154,4152122,700
W34246313399162,624
W911472154,8791932,682
X35970201,186297,449
X4246630193172,943
X91872208,3923239,701
Y14672232,0652910,890
Y21667282,5922320,775
Y25772212,1451615,096
Y34272251,6272610,000
Y35667263,9452624,352
       

Background Notes

Domestic Building Energy Ratings

 

Introduction 

A Building Energy Rating (BER) is an indication of the energy performance of a dwelling (represented in units of kWh/m2/year). Actual energy performance will depend on how the occupants operate the dwelling. A BER is based on the characteristics of major components of the dwelling including: wall, roof and floor dimensions; window and door sizes and orientations, as well as the construction type and insulation, ventilation and air tightness features; the system for heat supply (including renewable energy), distribution, and control; and the type of lighting. The BER certificate indicates the annual primary energy usage and carbon dioxide emissions associated with the provision of space heating, water heating, ventilation, lighting, and associated pumps and fans. The energy use is calculated on the basis of a notional family with a standard pattern of occupancy - hence data in this release giving average primary energy use or carbon dioxide emissions are not based on actual data. A BER only covers electricity used for heating, lighting and ventilation with associated pumps and fans. Electricity used for cooking, refrigeration, laundry and other appliance use are not included.

Since 1st January 2009, a BER certificate and advisory report is compulsory for all homes being sold or offered for rent. A BER is also required for new dwellings that apply for planning permission on or after 1st January 2007. A BER certificate is required to avail of the grants for energy-efficiency improvements to the home that are provided under the Better Energy Homes scheme.

Access to Microdata 

Further information on the BER scheme (including links to a microdata research tool) is available on the Sustainable Energy Authority of Ireland website at http://www.seai.ie/BER/ 

Revisions 

The figures will be updated on a quarterly basis. While the changes to previous quarters will mainly relate to the most recent quarter, previous periods are also subject to revision mainly arising from some dwellings having another BER audit undertaken.

Coverage 

There are three types of BER Certificates. A New Dwelling – Provisional BER is required for a dwelling that is not yet built but is offered for sale off the plans. A New Dwelling – Final BER is required for a newly-built dwelling before it is occupied. This certificate is based on data collected in a site survey carried out by a registered BER Assessor as well as drawings and specifications for the completed dwelling. An Existing Dwelling BER is required for any existing dwelling that is offered for sale or to let. An existing dwelling is one that has previously been sold or occupied. This is based on data collected in a site survey carried out by a registered BER Assessor. Both the New Dwelling – Final BER and the Existing Dwelling BER certificates are valid for 10 years from the date of issue. They become invalid if material changes are made to the dwelling during that period. This release is an analysis of Final and Existing BER certificates. To ensure that all tables are consistent with each other, records that contain missing data in any of the main classification variables used in this release have been excluded e.g. missing response for county. Records with only the main space heating fuel or main water heating fuel information missing have been included except in tables using those variables. 

National representativeness  

There were 627,554 unique domestic BERs (one per dwelling) completed in the period 2009 to the end of June 2016. This compares with around 1.66 million occupied private households enumerated in the 2011 Census of Population. The 2011 Census of Population included questions on county of location of the dwelling, the period when the dwelling was built, and the type of dwelling. These questions can be used to weight the BER data to national level. Table 15 presents an initial weighting of BERs up to national level of non vacant households using the 2011 Census of Population. The weights were calculated by dividing the number of non vacant households in the Census by the number of unique BER households. In cases where a household had more than one BER carried out in the period 2009-2015 only the most recent BER was used. Around 7% of Census households were excluded because there were no BER households in the particular stratum e.g. detached houses in Dublin 1 that were constructed in the period 1919-1945. A stratum was classified as a unique combination of County (52 categories - Dublin postal districts were distinguished), period of construction (nine categories) and dwelling type (four categories). The BER contains more disaggregated dwelling types, e.g. mid-terrace house, but these had to be aggregated to correspond to the Census classification. 

In mid-2015 the Census and BER files were allocated Eircodes. This makes it possible to match both files at household level as postcodes are unique at letter-box level. This will create an opportunity to calculate weights in a more precise manner.

Non-domestic Buildings  

Since 1st July 2008, a BER Certificate is required for all new non-residential buildings and from 1st January 2009 for all public service buildings and for existing non-residential buildings. The CSO is in the process of obtaining access to the non-residential file.

Definitions  

The BER rating scale is divided into categories from G (largest primary energy usage) to an A1 rating (lowest primary energy usage). The kilowatt-hour is the unit of energy used in Dwelling Energy Assessment Procedure (DEAP). The BER is measured in kWh per square metre of floor area of the dwelling per year (kWh/m2/year). The full range of categories is described in Table A. For the purposes of this release A1, A2, and A3 have been combined together because of the small number of Certificates in these categories. 

Table A: Building Energy Rating Categories 

Category

kWh/m2/year

A1

≤ 25

A2

> 25

A3

> 50

B1

> 75

B2

> 100

B3

> 125

C1

> 150

C2

> 175

C3

> 200

D1

> 225

D2

> 260

E1

> 300

E2

> 340

F

> 380

G

> 450

 

County is where the dwelling is located. 

Type of dwelling is selected from one of the following: Detached house; Semi-detached house; End of Terrace house; Mid-terrace house; Ground-floor apartment; Mid-floor apartment; Top-floor apartment; Basement apartment; and Maisonette. 

Year of construction is when the dwelling was originally built. 

The fuel used by the Main Space Heating system. The main space heating system heats the largest proportion of the dwelling. This proportion is calculated using a count of the habitable rooms. It often provides hot water as well as space heating. 

The fuel used by the Main Water Heating system. This category has similar fuel response options to the Main Space Heating system. 

The Total Internal Floor Area of the dwelling is the total area of exposed and semi-exposed floors. It excludes any unheated areas that are thermally separated from the dwelling. The total energy usage is divided by the dwelling floor area to determine the Building Energy Rating. 

Table Notes  

Table 1 presents the number of Final and Existing BERs published by month since January 2009. A household that has had BERs conducted in different years is included in each year. This table gives an overview of the number of BER assessments being performed and will inform the user of changes since the previous quarterly analysis. 

Tables 2-13 only include the latest BER published for each dwelling from January 2009 to June 2016; hence the total number of BER certificates is lower than the total in Table 1.

Table 2 shows the general impact of the age of the dwelling on the BER profile. It can be linked with changes to the Building Regulations that require new homes to be more energy efficient. 

Table 3 shows how the BER profile varies by type of dwelling. 

Tables 4-5 profile BERs by county and Dublin postal district. Table 4 is in county within province order. 

Tables 6-7 profile BERs by main space and water heating fuels respectively. Records with a missing response for main space heating fuel have been excluded from Table 6 and 8. Similarly records with a missing response for main water heating fuel have been excluded from Table 7. 

Table 8 cross-classifies county by main space heating fuel. Mains gas is not generally available in some counties. Some counties use local heating fuels such as peat e.g. County Offaly. 

Tables 9-10 cross-classify main space heating fuel by period of construction and dwelling type. 

Tables 11-13 cross-classify the BER by period of construction and the dwelling type. The latter is more precisely defined in recent years but in the earlier years more general descriptions such as House were in use. It is not possible to reclassify these to detached, semi-detached, end-of-terrace, or mid-terraced house. The average primary energy use and average carbon dioxide figures are notional figures based on assumed energy use factors and occupancy. 

Table 14 is an analysis of properties that had BER audits carried out in more than one year. The earliest and latest BER ratings are cross-classified to show trends in energy savings arising from insulation, retrofitting etc.

Table 15 is an analysis of BER properties after they have been weighted to Census 2011 level. It can be compared with the Total row profile in Table 2. See the entry under National representativeness for more details.

Table 16 profiles the 139 Eircode routing keys by BER rating. The table gives the percentage of A-B, C-D, and E-G energy ratings for each routing key. The number of BER dwellings with a pre-assigned Eircode and the average age of those dwellings are also given. The table only includes dwellings that have both a BER rating and a pre-assigned Eircode. The proportion of dwellings that have had a BER audit can vary across routing keys and this should be taken into account in interpreting the table. As part of the preparations for the launch of Eircode, around 95% of dwellings in the 2011 Census of Population file were pre-assigned an Eircode. The number of such dwellings in each routing key area is given in Table 16. This allows users to roughly determine the proportion of dwellings in a routing key that have a BER rating and a pre-assigned Eircode. In areas where this proportion is low, additional care should be taken in interpreting the BER ratings profile as it may not be fully representative of the routing key.

Table B contains a provisional listing of routing keys by county. The list is indicative only as it is not based on an analysis of the full Eircode database. Dwellings were assigned to an Eircode routing key based on their An Post principal postal town span of delivery rather than on the actual geographical location of the dwelling.

 

Table B: Provisional listing of routing keys by County

County

Main Eircode Routing Keys

Carlow

R21, R93, R95

Cavan

A81, A82, F91, H12, H14, H16

Clare

V14, V15, V94, V95

Cork City

T12, T23

Cork County

P12, P14, P17, P24, P25, P31, P32, P36, P43, P47, P51, P56, P61, P67, P72, P75, P81, P85, T12, T23, T34, T45, T56

Donegal

F91, F92, F93, F94

Dublin City

D01-D24 including D6W

Dublin County

A41, A42, A45, A94, A96, K32, K34, K36, K45, K56, K67, K78

Galway City

H91

Galway County

F42, F45, H53, H54, H62, H65, H71, H91

Kerry

P51, V23, V31, V92, V93

Kildare

A83, R14, R51, R56, W12, W23, W34, W91

Kilkenny

E32, E41, R95, X91

Laois

R14, R32, R93

Leitrim

F91, H12, N41

Limerick City

V94

Limerick County

P56, V35, V42, V94

Longford

N39

Louth

A91, A92

Mayo

F12, F23, F26, F28, F31, F35

Meath

A82, A83, A84, A85, A86, A92, C15, K32

Monaghan

A75, A81, H18, H23

Offaly

R32, R35, R42, R45

Roscommon

F42, F45, F52, N37, N39, N41

Sligo

F26, F52, F56, F91

Tipperary

E21, E25, E32, E34, E41, E45, E53, E91, V94

Waterford City

X91

Waterford County

P36, P51, X35, X42, X91

Westmeath

N37, N91

Wexford

Y21, Y25, Y34, Y35

Wicklow

A63, A67, A98, W91, Y14

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