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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 1 2016

% of column
Period of constructionEnergy rating
ABCDEF-G
1700-19771915305079
1978-199901232453416
2000-20040132917114
2005-200985724852
2010-20169080000

90% of "A" rated dwellings were built since 2010

Domestic Building Energy Ratings Q1 2016 Headline graph
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90% 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 first quarter of 2016 a total of 20,112 Building Energy Rating (BER) audits were conducted on dwellings, bringing the cumulative total of BER audits conducted since January 2009 to 658,109 (see Table 1). 

 Semi-detached and detached houses comprised the majority of BER audits conducted, (52%),  with over 157,000 audits conducted for each of these types of dwellings (see Table 3).

Dwellings that used Wood Pellets for main space heating type were most likely to be "A" or "B" rated (45%). Peat fuelled dwellings had the highest proportion of "F" and "G" rated properties (58%). Dwellings that used Coal, Smokeless Fuel, Peat or Solid Multi-Fuel had the lowest percentage of "A" rated properties (see Table 6).

A-BC-DE-G
Mains Gas196615
Bulk LPG26677
Bottled LPG126523
Heating Oil97120
Electricity54748
Coal01981
Smokeless Fuel01882
Peat01585
Wood Pellets & Chips44478
Wood Logs93061
Solid Multi-Fuel02376
All Fuels126325

Table 8 describes how the type of space heating fuel used in dwellings covered by the BER audit varied across counties. The county with the highest percentage of solid fuel usage was Offaly (26%). Solid fuel was the main space heating type in just 6% of BER audited dwellings country-wide. Galway City had the highest proportion of dwellings using electricity for their main space heating with 36% of dwellings assessed, followed by Sligo (22%) and Dublin 1-24 (21%) (see Table 8).

Dublin County has the highest percentage of "A" or "B" rated properties in the country at 20%, while Limerick City has the lowest percentage of "A" and "B" rated dwellings with just 5%. In contrast, Offaly has the highest proportion of "F" and "G" rated dwellings, with 20% of BER assessments (see Table 4).

CountyA-BCDEF-G
Carlow1140261112
Dublin 01-241531261513
Dublin County203624119
Kildare144126108
Kilkenny1038261214
Laois1239221315
Longford1035261316
Louth154323911
Meath14452399
Offaly733221820
Westmeath1137251216
Wexford838281313
Wicklow1335251314
Clare838271413
Cork City1436241313
Cork County174121911
Kerry1237261313
Limerick City540301213
Limerick County840281212
Tipperary635271418
Waterford City937311210
Waterford County1039281112
Galway City736331410
Galway County940251213
Leitrim839231218
Mayo838271216
Roscommon741231218
Sligo1034271515
Cavan1243211113
Donegal1043241113
Monaghan1236271213

In dwellings that have had more than one assessment carried out, 13% of dwellings originally had a "G" rating. In the latest assessment carried out just 2% of these had a "G" rating. In the earliest assessment 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).

BER ratingEarliest YearLatest Year
A10
A200
A300
B101
B214
B3412
C1717
C2916
C31114
D11312
D21410
E1105
E283
F103
G132
Table 1 Domestic Building Energy Ratings Certificates 1
         number
Period20092010201120122013201420152016Total
January4,1004,6688,5636,5226,9677,0026,5195,37349,714
February6,3215,6159,0186,3018,5247,5407,6567,02257,997
March8,7646,1528,9366,5078,2048,3807,2597,71761,919
April8,0335,4857,7784,4398,2978,7317,584 50,347
May7,9265,4768,8725,8728,6478,7287,714 53,235
June8,7295,7357,4594,8667,2618,2187,998 50,266
July8,7755,9727,2525,5357,0959,3937,679 51,701
August7,2716,4587,5325,0486,9758,1637,649 49,096
September7,5187,4238,8694,9758,2819,9158,359 55,340
October6,5948,4049,5736,6868,98010,7729,222 60,231
November6,97611,6179,6238,8229,60910,9108,421 65,978
December6,3488,0429,4836,3696,9407,7877,316 52,285
          
Total87,35581,047102,95871,94295,780105,53993,37620,112658,109
          
1 Includes all Certificates for Dwellings
Table 2 BER Ratings by Period of Construction
              % of row
Period of ConstructionEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
1700-18990012234710910143815,511
1900-19290012234710910143731,993
1930-19490013457913910142629,506
1950-1966001246812141111131846,135
1967-19770013691216171199862,009
1978-198200138121519181065342,601
1983-19930014812152018954369,843
1994-19990014915192115754274,566
2000-200400171521211595321112,088
2005-200913112123179642110111,167
2010-2016502513721110000012,938
               
Total113711131313127557608,357
               
Table 3 BER Ratings by Type of Dwelling
              % of row
Dwelling TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Apartment14111312710101065564,448
Ground-floor apartment113810101012141186735,076
Mid-floor apartment151112111212129533342,751
Top-floor apartment0149999121510761036,151
Basement Dwelling  23627591311933168
Maisonette12811131010111364476,152
House12391214141311544838,525
Detached house1127111314141265510157,371
Semi-detached house211510151616127555157,177
End of terrace house11151013131312767943,567
Mid-terrace house11281313111211766886,971
               
Total113711131313127557608,357
               
Table 4 BER Ratings by County
 % of row
CountyEnergy Rating Average age
AB1B2B3C1C2C3D1D2E1E2FGTotal
Carlow0127121414151165578,75028
Dublin 01-24124710111113138777134,85335
Dublin County52581113131311654442,87427
Kildare31381214151511644523,17323
Kilkenny01271213131412755910,41734
Laois012910141412976699,48928
Longford0127111212151176795,47026
Louth12381415141310544616,13131
Meath21381316151310544518,12924
Offaly0124812121111999118,10533
Westmeath013710121514116561011,63829
Wexford1125914151513855820,40327
Wicklow21371112121312766816,71132
Clare0016913151513865817,48131
Cork City11481213121312755813,62942
Cork County124111514121110544755,93531
Kerry11371113131412755820,57627
Limerick City0013111415151475679,86335
Limerick County00261114151514755719,73431
Tipperary01149121314138671120,99238
Waterford City1125101315171475466,09835
Waterford County11261113141513745610,34633
Galway City012471216181596558,32725
Galway County01261114151412765827,37927
Leitrim00261214131211667114,63929
Mayo11258141614137561016,37830
Roscommon00151114151211756127,12930
Sligo1127912131413966810,45029
Cavan012815161312965589,19325
Donegal01261315141311655817,81327
Monaghan1138121112141375586,25234
                
Total113711131313127557608,35731
                
Table 5 BER Ratings by Dublin Postal District
 % of row
CountyEnergy Rating Average age
AB1B2B3C1C2C3D1D2E1E2FGTotal
Dublin 1026791011131496576,04229
Dublin 2147671011131296673,41635
Dublin 31025789111310911145,79854
Dublin 411479910131497887,57742
Dublin 5012579111614109865,58442
Dublin 61134668111310910166,12356
Dublin 6W212788913138910103,09248
Dublin 700125981214101011177,81355
Dublin 803687891213878119,98742
Dublin 910368991214109996,78545
Dublin 10  24141613121176772,56441
Dublin 111281212111111965557,58829
Dublin 1201346791214101012126,20651
Dublin 1331412111111131276544,31629
Dublin 1413689910121397766,41737
Dublin 15325101315141612522113,38717
Dublin 162158111313151475425,71427
Dublin 17117914201414842213,44724
Dublin 18271115161399832216,82217
Dublin 20 59108891313117541,51430
Dublin 220014813141819106434,50826
Dublin 2411251215151614864210,15221
                
Total124710111113138777134,85335
                
Table 6 BER Ratings by Main Space Heating Fuel
              % of row
Fuel TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Mains Gas2251015151413105442233,457
Bulk LPG126172118139632118,869
Bottled LPG1138121512121443510780
Heating Oil012612151616126555236,044
Electricity2111358131713981886,978
Coal  00011413151318353,483
Smokeless Fuel 0 0001313161417353,799
Peat 0  011310131316421,371
Wood Pellets & Chips3613221314106422321,151
Wood Logs32232349139101032558
Solid Multi-Fuel00000127141414163324,260
               
Total113711131314127557600,750
               
Table 7 BER Ratings by Main Water Heating Fuel
              % of row
Fuel TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Mains Gas2251115161413105442231,997
Bulk LPG126172118139632118,813
Bottled LPG003813151310145459831
Heating Oil012612151616126555234,288
Electricity2111358131712982091,625
Coal0001112514151518273,348
Smokeless Fuel   0011415181519273,469
Peat   0011411131316401,405
Wood Pellets & Chips3614221313106422311,155
Wood Logs222333510131091028509
Solid Multi-Fuel00000128141514162923,310
               
Total113711131314127557600,750
               
Table 8 Main Space Heating Fuel by County
      % of row
CountyFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
Carlow364610628,743
Dublin 01-247362110130,218
Dublin County7712101042,091
Kildare4739103123,068
Kilkenny305289210,373
Laois304571619,465
Longford262191435,407
Louth563553115,952
Meath424583118,121
Offaly95492618,000
Westmeath15531514311,597
Wexford1691513320,304
Wicklow434195116,619
Clare12601412317,444
Cork City7210162013,495
Cork County4140134255,573
Kerry1651910520,486
Limerick City552020409,731
Limerick County2848149119,653
Tipperary1365812120,924
Waterford City611421306,082
Waterford County2553147210,294
Galway City164236428,253
Galway County766167327,303
Leitrim066161364,637
Mayo372139316,343
Roscommon373111047,128
Sligo262229510,432
Cavan96910859,125
Donegal08196417,674
Monaghan8747836,215
       
Total39391462600,750
       
Table 9 Main Space Heating Fuel by Period of Construction
      % of row
Period of ConstructionFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
1700-189930382210115,105
1900-192931391910131,544
1930-19494238910129,451
1950-1966454167145,994
1967-1977385147161,432
1978-1982355248142,424
1983-19933446118269,418
1994-19993338235174,070
2000-200438362042111,322
2005-200947291824107,840
2010-20166021171212,150
       
Total39391462600,750
       
Table 10 Main Space Heating Fuel by Type of Dwelling
      % of row
Dwelling TypeFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
Apartment46448124,192
Ground-floor apartment477431233,536
Mid-floor apartment401581139,557
Top-floor apartment423531234,470
Basement Dwelling2896121151
Maisonette53736236,072
House187055338,505
Detached house1571562157,240
Semi-detached house4740481156,971
End of terrace house592587143,408
Mid-terrace house602297186,648
       
Total39391462600,750
       
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
1700-18996953455653105148158144115106118
1900-19296451445344891191241209690100
1930-1949525945515276110120109848297
1950-19667064535658631161251138786104
1967-197766645954110621321391078484109
1978-19826364635410068137142968482109
1983-1993585755575871146149958280108
1994-19996763586761771521611018383110
2000-20047470697758891661771029591114
2005-200981727278959616919010610097110
2010-20168178747786105193209124122113140
             
All7667667059871471551049088110
             
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
1700-1899436425392491400474417412387421370405
1900-1929475430417508379452415421390426382410
1930-1949367354284421485450377402351378332367
1950-1966419334304399515308340355312344305330
1967-1977386321268376311330291299286284257288
1978-1982333291247298309302246253259246225251
1983-1993343307257303314283229234248250227241
1994-1999282283242286264262208209232255231226
2000-2004253245209244316215189193215222197207
2005-2009170189162193186164152163176171157168
2010-201612310686109132871008973757584
             
All222253201260334232234244245265256245
             
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
1700-18991029687112851121071079410187100
1900-19291139894115831081071109410289101
1930-1949858161931071049610483887790
1950-19669975658711366869071797078
1967-1977927257817777747466676069
1978-1982806653667770626362575261
1983-1993827057696964575858585258
1994-1999666454645959515154595253
2000-2004585346537046464751494348
2005-2009374034413634363941383438
2010-2016252217213017232015151518
             
All505643577251586157615958
             
Table 14 Dwellings with Multiple BER Ratings
               % of total
Earliest YearLatest YearTotal
A2A3B1B2B3C1C2C3D1D2E1E2FG
A1    0         0
A20    0        0
A3 0000         0
B1 0000000 0    0
B20 000000000 0 1
B3 000210000000 4
C1 00023100000007
C2 00013210000009
C3 000123210000011
D1 000123321000013
D20000122232100014
E10000111122100010
E2000011111211008
F0000111111111010
G0000111111111213
                
Total00141217161412105332100
                
Table 15 BER Ratings Weighted to National Level
              % of row
Dwelling TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Apartment126910101012128659163,121
Detached house1127101213131265611675,417
Semi-detached house11149131516138666434,141
Terraced house1126101211121287810262,298
               
Total1126101213141276691,534,977
               
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
A4241536939857
A4558376711496
A6318602327341810,871
A6711573217701810,468
A75127019666126,596
A81176716588155,848
A8214711520391020,778
A832568649295,377
A842663111108104,944
A8512826920116,185
A86127810566133,252
A9114691750762327,223
A9214711564451335,428
A9413553253373420,227
A9614533363213621,303
A989603131372816,074
C1513731545751228,199
D0110593133521714,466
D021157312026208,141
D035445040476417,070
D0410573357072920,216
D056573742334319,507
D0611434641453519,993
D6W10543627634010,947
D074484862245425,715
D0813464162672127,504
D0910523950284522,427
D10665292135377,780
D1118582457263423,778
D128464651985822,588
D1321592148732720,848
D1413543346594116,829
D15177310108451338,389
D1617641948762719,727
D17682122248347,008
D1827621063171120,900
D2045936858314,619
D2213672139802517,219
D2414681886731536,055
E2186725490204,688
E2586824590125,023
E3247225784236,027
E3426136975308,661
E414603620272016,385
E4510662518111311,226
E5385834828175,274
E917682523332514,982
F1210741610521015,396
F235821216311411,044
F267692422761422,339
F2813622610651513,030
F31115929276103,312
F351772229793,946
F4287121755109,384
F45378197101012,237
F5217671655196,207
F5616711342584,568
F9110622751641428,841
F929781432771230,129
F9311751425321030,647
F9412682013961223,662
H1212691816631013,192
H1487616416104,755
H16176716178132,905
H1810662411281611,404
H2326038240451,716
H536662912401314,545
H546732112761012,034
H6268113826116,592
H651379875795,358
H7125939280122,755
H9167420129381470,566
K32187392660910,948
K341169191001184,416
K3622651326581310,451
K45688650793,061
K5615769666133,549
K6711781236061316,905
K782170943761316,551
N3710642631731518,150
N391266222841920,212
N41874181337914,207
N9112662237591224,277
P12236413499117,473
P1423512639261,101
P17155827788145,479
P241661221163125,962
P2520701124591012,628
P312268102224128,427
P327732015301,423
P361260281090117,634
P431772112202149,047
P47244729296135,214
P5123621631691130,289
P56157114482125,309
P61167014946116,726
P67127216447173,742
P72196615854137,369
P7596229638158,877
P81116029754139,606
P85106327561136,171
R14975161706119,356
R2187122272133,408
R3216622147991129,744
R356613322071515,418
R4245343955139,331
R4555936657153,844
R5147422931146,329
R5697319590134,169
R9311711842631321,978
R9511682048621729,921
T12156222133302552,685
T2312652480543331,254
T345148113381,185
T45266952145117,795
T563365328582,242
V14773201399364,233
V1545838716138,128
V23186220254105,436
V3186329857129,458
V351151388311210,791
V4267420897116,194
V928662543481732,027
V9311701928921326,572
V9467519163652076,638
V957722156221532,935
W121173161960149,351
W2316691543881622,700
W3424631339892,624
W9114721548581332,682
X35970201190157,449
X4246630193122,943
X918722084471839,701
Y145722320851510,890
Y216672825771220,775
Y257722121461115,096
Y342732516231210,000
Y357672639331424,352
       

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 608,357 unique domestic BERs (one per dwelling) completed in the period 2009 to the end of March 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 March 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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