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E-mail: environment@cso.ie Berna Lawlor (+353) 1 4984210 Sheona Gilsenan (+353) 1 4984202
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CSO statistical release, 11 October 2016, 11am

Domestic Building Energy Ratings

Quarter 3 2016

% of row  
Period of constructionEnergy rating 
ABCDEF-GTotal
1700-19770318252033197,007
1978-1999053937147197,016
2000-200408582473118,804
2005-2009135501031116,479
2010-20165738410015,954

57% of dwellings built since 2010 are "A" rated

Figure 1 BER grade by period of consturction

In the third quarter of 2016 a total of 21,701 Building Energy Rating (BER) audits were conducted on dwellings, bringing the cumulative total of BER audits conducted since January 2009 to 702,489.

The number of BER audits carried out in Quarter 3 2016 represents a reduction of over 8% in audits carried out compared with the same period in 2015. Overall the number of BER audits carried out in the first 9 months of 2016 has decreased by almost 6% compared with 2015, see Table 1.

62% of dwellings audited since 2009 are rated either "C" or "D", with just 2% of all dwellings assessed given an "A" rating. However, 57% of dwellings built since 2010 are "A" rated, see Table 2.

Detached houses are the most common dwelling type being audited; they are closely followed by Semi-detached houses. Both represent approximately 26% each of the total audits carried out, see Table 3.

The average age of a dwelling nationally is 31 years old, Cork city has the oldest dwellings on average at 43 years, while Kildare has the lowest average age of dwellings at 24 years, see Table 4.

In Dublin city specifically, while the average age is 36 years old, Dublin 6 has the oldest dwellings (averaging 57 years old), while Dublin 15 and Dublin 18 have newer dwellings with an average age of 17 years, see Table 5.

Dublin 18 has the highest percentage of "A" and "B" rated dwellings in Dublin city with 38%, while Dublin 7 has the lowest with 3%. Dublin 7 also has the highest percentage (47%) of the lowest rated dwellings ("E","F","G") , see Table 5.

The majority of dwellings are either using Oil or Mains Gas for their main heating purposes (39% each). Dwellings using Mains Gas for their heating are more likely to be rated "A" or "B" (19%) when compared with dwellings using Oil (9%). 47% of all of the dwellings where the main space heating is Electricity are rated "E","F", or "G". These dwellings make up 15% of the overall total dwellings assessed, see Table 6.

ABCDEFG
01 Mains Gas2174422942
02 Heating Oil0943281155
03 Electricity33163121818
04 Solid Fuel02419271633
05 LPG1245116522
National11137251257

 The county with the highest percentage of solid fuel usage was Offaly (25%). 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 (01-24) used heating oil less than any other area, with just 6% of dwellings. They were followed by Cork City with 10% of households using Heating Oil and Dublin County with 12%, see Table 8.

The largest number of dwellings audited were those that were constructed during the years 2000 to 2004, these comprised 19% of the total audits carried out. These dwellings were most likely to be heated by mains Gas (38%). Electricity is also an important space heating source, particularly in dwellings built in the period 1994-2004 when just over 1 in 5  (21%) dwellings built at that time rely on electricity for their main space heating requirements. In dwellings constructed before 1949, 10% of the dwellings use solid fuel as the main space heating source, see Table 9.

Electricity is the main space heating fuel used in most types of apartments that were audited. 58% of mid floor apartments heated their dwellings using electricity. Semi-detached and terraced houses used Mains Gas as their main space heating source, (47% and 59% respectively) , see Table 10.

ABCDEFG
Carlow11040261157
Cavan01143211158
Clare0838271458
Cork City11336241358
Cork County1164121948
Donegal0943241158
Dublin 01-2421232261577
Dublin County51437251144
Galway City0635321565
Galway County1940251258
Kerry11137261358
Kildare41141261045
Kilkenny11038261159
Laois01239221269
Leitrim08382312711
Limerick City0540301267
Limerick County1840281257
Longford0935261379
Louth1144323946
Mayo17372712610
Meath2124522945
Monaghan11136271258
Offaly06332218911
Roscommon07412212612
Sligo1934261569
Tipperary06352714711
Waterford City1838311246
Waterford County1939291156
Westmeath010372512610
Wexford1738281358
Wicklow31036241368
National11137251257

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

Detached houses are the largest dwelling types (156 sq metres) , the average size of detached houses has increased in every construction period since 1929. Detached houses built since 2010 have the largest average floor area of 209 sq metres. This is almost 3 times the size of an average mid floor apartment built in the same period (72 sq metres), see Table 11.

ApartmentHouseAll
1700-189956135118
1900-192952109100
1930-19495310197
1950-196659107104
1967-197760112109
1978-198261112109
1983-199358115108
1994-199963124110
2000-200473130114
2005-200975134111
2010-201677153140
Table 1 Domestic Building Energy Ratings Certificates 1
         number
Period20092010201120122013201420152016Total
January4,1014,6698,5636,5236,9677,0046,5195,29449,640
February6,3215,6149,0206,3048,5247,5407,6576,94757,927
March8,7666,1538,9396,5088,2068,3857,2617,60861,826
April8,0335,4847,7804,4388,2978,7327,5867,44857,798
May7,9265,4768,8705,8728,6468,7297,7147,99861,231
June8,7295,7377,4594,8657,2618,2188,0007,49657,765
July8,7755,9717,2535,5357,0969,3947,6766,66658,366
August7,2716,4577,5315,0476,9738,1637,6497,12856,219
September7,5197,4258,8714,9768,2819,9208,3587,90763,257
October6,5918,4029,5686,6868,98010,7749,222 60,223
November6,97511,6179,6238,8209,60910,9008,420 65,964
December6,3488,0429,4816,3686,9407,7807,314 52,273
          
Total87,35581,047102,95871,94295,780105,53993,37664,492702,489
          
1 Includes all Certificates for Dwellings
Table 2 BER Ratings by Period of Construction
             % of row 
Period of ConstructionEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
1700-18990012234710910143816,622
1900-19290012234710910143734,466
1930-194900134579121010132631,389
1950-1966001346812141111131849,126
1967-19770013691216171199865,404
1978-198200138121518181065344,730
1983-19930014913162018954373,561
1994-19990014915182115754278,725
2000-200400171522211594321118,804
2005-200913112123179642110116,479
2010-2016572111621100000015,954
               
Total213711131313127557645,260
               
Table 3 BER Ratings by Type of Dwelling
             % of row
Dwelling TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Apartment14111312710101065564,409
Ground-floor apartment113810101012141086736,906
Mid-floor apartment151112111212129533344,917
Top-floor apartment11481099121510761038,117
Basement Dwelling  23628781210932181
Maisonette12711131110111364586,580
House12391214141311544838,200
Detached house1127111314131165610169,590
Semi-detached house211511151615127555168,123
End of terrace house21151013131312767946,157
Mid-terrace house11281313111211766892,080
               
Total213711131313127557645,260
               
Table 4 BER Ratings by County
% of row  
CountyEnergy Rating Average age
AB1B2B3C1C2C3D1D2E1E2FGTotal
Carlow1127121414151165579,34428
Dublin 01-24224710111113128667146,43436
Dublin County62481113131311654446,53428
Kildare41371214151511644526,00124
Kilkenny11271213131412755911,21334
Laois1129111514129666910,63028
Longford0127111212151176795,79826
Louth1238141514139644617,87931
Meath3138141615139544520,57925
Offaly1114912121111999119,08533
Westmeath013710121514116561012,56930
Wexford1125914151513855822,03528
Wicklow31271113131311766819,06632
Clare0016914151512865818,65231
Cork City12481212121211865715,65643
Cork County124111514121110544860,30332
Kerry11371113131412755822,15028
Limerick City10141113151514756710,72436
Limerick County10261114151513755720,73031
Tipperary011410121314138671122,54938
Waterford City1125111315171475467,03135
Waterford County11261113141513745611,02934
Galway City112581216171586659,49624
Galway County11261114151311765828,93427
Leitrim00261214131211667115,08830
Mayo11258131514137561017,96730
Roscommon00151114151210756127,80231
Sligo1127912131313966911,22629
Cavan0128141613129655810,11526
Donegal11261315141311655819,78028
Monaghan1138131112141375586,65434
                
Total213711131313127557663,05331
                
Table 5 BER Ratings by Dublin Postal District
% of row 
CountyEnergy Rating Average age
AB1B2B3C1C2C3D1D2E1E2FGTotal
Dublin 1226791011131496576,44029
Dublin 2147681012131296673,54235
Dublin 31025789111210911146,08854
Dublin 411479910131497887,92743
Dublin 5012579111614109865,92242
Dublin 61134668111310910176,42457
Dublin 6W212788912138910103,30749
Dublin 700126981214101011168,37355
Dublin 8036878912138781110,48043
Dublin 92036810101114109997,31945
Dublin 10  25131613121186772,68742
Dublin 111281212111211965557,95530
Dublin 1201346791314101012126,60051
Dublin 1331412111111131176544,60629
Dublin 1423688910121397766,82337
Dublin 15525101315141511522114,26217
Dublin 163148111312151375426,08927
Dublin 17417914201414842213,61124
Dublin 18371216161299832217,33317
Dublin 20 48108891313107541,59731
Dublin 220013813141819106434,85926
Dublin 2411251215151614864210,58622
                
Total224710111113138667142,83236
                
Table 6 BER Ratings by Main Space Heating Fuel
             % of row
Fuel TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Mains Gas225101516141395442247,943
Bulk LPG126172118139632119,325
Bottled LPG0138131512121354511828
Heating Oil012612151615126555250,263
Electricity3111358131712981892,513
Coal  00011413141418353,540
Smokeless Fuel 0 0001313151519344,351
Peat 0  011310131316421,403
Wood Pellets & Chips3613211314106432221,202
Wood Logs32232348129101032578
Solid Multi-Fuel00000127131414163325,421
               
Total113711131313127557637,367
               
Table 7 BER Ratings by Main Water Heating Fuel
             % of row
Fuel TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Mains Gas225101516141395442246,429
Bulk LPG126172118139632119,282
Bottled LPG003813151410135459888
Heating Oil012612151616126555248,371
Electricity3111358131712982097,440
Coal0001112514151519273,419
Smokeless Fuel   0011414171620263,976
Peat   0011411131317401,436
Wood Pellets & Chips3613211414106532321,200
Wood Logs22233351013991028529
Solid Multi-Fuel00000127141515172924,397
               
Total113711131313127557637,367
               
Table 8 Main Space Heating Fuel by County
     % of row
CountyFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
Carlow364610629,142
Dublin 01-247362010138,029
Dublin County7712101044,589
Kildare4738103124,787
Kilkenny295289210,949
Laois3145716110,277
Longford262191435,649
Louth563653117,161
Meath424593119,927
Offaly95592518,690
Westmeath14541514312,251
Wexford1701512321,473
Wicklow4341105118,036
Clare12601411318,129
Cork City7110172014,591
Cork County4041134258,613
Kerry1651910521,491
Limerick City5520214010,327
Limerick County2849149120,253
Tipperary1365912121,933
Waterford City621420306,734
Waterford County2453147210,763
Galway City164135629,154
Galway County767167328,294
Leitrim066161264,930
Mayo372139317,332
Roscommon37311947,625
Sligo162229510,980
Cavan96910849,810
Donegal08196418,957
Monaghan8738836,491
       
Total39391562637,367
       
Table 9 Main Space Heating Fuel by Period of Construction
     % of row
Period of ConstructionFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
1700-189929382210116,213
1900-192931391910133,996
1930-19494239910131,332
1950-1966454167148,983
1967-1977375147164,807
1978-1982355248144,521
1983-19933446118273,112
1994-19993338226178,245
2000-200438362042118,030
2005-200947291824113,119
2010-20165919191215,009
       
Total39391562637,367
       
Table 10 Main Space Heating Fuel by Type of Dwelling
     % of row
Dwelling TypeFuel TypeTotal
Mains GasHeating OilElectricitySolid FuelLPG
Apartment46447124,153
Ground-floor apartment477431235,300
Mid-floor apartment401581141,622
Top-floor apartment423531236,363
Basement Dwelling2796221164
Maisonette52737236,495
House187055338,180
Detached house1571562169,451
Semi-detached house4740481167,900
End of terrace house592587145,993
Mid-terrace house602297191,746
       
Total39391562637,367
       
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
1700-18996953465654107148158145115106118
1900-19296451445443901191241209790100
1930-1949516045515274110120110848297
1950-19667064545558631161251138886104
1967-197766645955110631321391088484109
1978-19826365635510066137142968482109
1983-1993585855575870146149958280108
1994-19996763586760761521611018383110
2000-20047471697764891661771039591114
2005-200981727278959616919110610097111
2010-20168178727786105194209125124115140
             
All7667667059861471561059188110
             
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
1700-1899432426390490399477416412387419367403
1900-1929475428443506376448415420389424381410
1930-1949363354284420485453377402349375331366
1950-1966415333299394515314338355311343305329
1967-1977386318261367311330291299285284258288
1978-1982333289246294309303246253258247225251
1983-1993345304256301314284228234247249226241
1994-1999282282241284258262207209232254230226
2000-2004253243208243291214189193215221196206
2005-2009170189162192186164152163176172157168
2010-20161231028510413287998569717080
             
All222252200259333233233244243264255244
             
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
1700-18991019786112851121071069410186100
1900-19291139899114821071071109410189101
1930-1949858161931071059610483877789
1950-19669874648511367859071786978
1967-1977927155807777737466676069
1978-1982806653647771616362575261
1983-1993836957686965575858585258
1994-1999666354645858515154585253
2000-2004585346536446464750494348
2005-2009364034413634363941383438
2010-2016252116203017231914141417
             
All505543577251586157615858
             
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 000133210000011
D10000123321000013
D20000122232100014
E10000111122100010
E2000011111211008
F000011111111109
G0000111111111212
                
Total00141217161412105332100
                
Table 15 BER Ratings Weighted to National Level
             % of row
Dwelling TypeEnergy Rating Total
AB1B2B3C1C2C3D1D2E1E2FG
Apartment126911111011127659164,626
Detached house1127101213131265611675,747
Semi-detached house111510141516137666434,295
Terraced house1115101212131287810262,724
               
Total1126101213131276691,537,393
               
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
A4156377413394
A42415369510857
A4557385743496
A6318602227861810,871
A6710583217901810,468
A75117019667126,596
A81176716595155,848
A8214711620571020,778
A8324688522105,377
A842564111136104,944
A8512826955116,185
A86127810559143,252
A9114691751022427,223
A9214711564371335,428
A9413553253213420,227
A9614533362903621,303
A989603131272816,074
C1513731445871228,199
D0112583034461614,466
D021157312019198,141
D036445039736417,070
D0410573357182920,216
D056583641944319,507
D0611434641343519,993
D6W10543627534010,947
D074484862735425,715
D0813464162792127,504
D0910523949704522,427
D10665292131377,780
D1118582456883423,778
D128464651375822,588
D1322582049202620,848
D1413553346344116,829
D1517731010851338,389
D1618631948162719,727
D17682122232347,008
D1828621063241120,900
D2046036871314,619
D2213672139622517,219
D2414681886411536,055
E2186725502214,688
E2586924588125,023
E3247125794236,027
E34261371002308,661
E414603620302016,385
E4510652517991311,226
E5385834840175,274
E917682523282514,982
F1210741610811015,396
F235821316441411,044
F267682523671522,339
F2812622610741513,030
F31115930279103,312
F351772230093,946
F4287122755109,384
F45376207231012,237
F52166617594106,207
F5615711442984,568
F9110622752511528,841
F928771534071330,129
F9311741526581030,647
F9412682014341223,662
H1212692017021013,192
H1487517426104,755
H16186616173132,905
H1810662411301611,404
H2326038239451,716
H536652912751314,545
H546732012791012,034
H6268213821116,592
H6513789761105,358
H7125939282122,755
H917742012931470,566
K32187392677910,948
K34116919998184,416
K3622651326401310,451
K45688651193,061
K5615769667133,549
K6710781235751316,905
K782170943601316,551
N379652632761518,150
N391266222850920,212
N418741814211014,207
N9112662338561324,277
P12236413493127,473
P1424532438261,101
P17155827802145,479
P241661221147125,962
P2520691125551012,628
P312268102229138,427
P3211721718281,423
P361259281103117,634
P431772112308149,047
P47234829307135,214
P5123621631541130,289
P56147115499125,309
P61167014957116,726
P67127116457163,742
P72196615853137,369
P7596130671158,877
P81115830716139,606
P85106327562146,171
R14975171728129,356
R2186923278163,408
R3217622147941229,744
R356613323571515,418
R42453431013149,331
R4555936665163,844
R5147422933146,329
R5697318591134,169
R9311711842841321,978
R9511682049261729,921
T1215622213362452,685
T2312652480093331,254
T345148113581,185
T45266952148117,795
T563265329082,242
V14773201382364,233
V1545838738138,128
V23186221255105,436
V3186329868129,458
V351252378331210,791
V4277518870116,194
V928662543901732,027
V9311701929131326,572
V947741916102076,638
V957722156071532,935
W121173161949149,351
W2316691544041622,700
W3424631440092,624
W9113721549301332,682
X35970201181157,449
X4246630194122,943
X918722083841839,701
Y146722320541410,890
Y215672726111220,775
Y257722121611115,096
Y342722516301210,000
Y356672639671424,352
       

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 645,260 unique domestic BERs (one per dwelling) completed in the period 2009 to the end of September 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 September 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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