Energy classes of apartments

The energy classes (energialuokka) of apartments are always the same as the energy class of the residential building in which the apartments are located; this is because the energy performance certificate (energiatodistus) is always drawn up per building. The only exceptions are buildings in which space belonging to some other intended-use category accounts for more than 10 % of the floor area and that share is also more than 50 m². So, for example, in a situation where 80 % of a housing company (taloyhtiö) consists of block-of-flats space and 20 % of commercial space, a separate energy certificate is drawn up for each part of the building according to its intended-use category. The energy class of an apartment is nevertheless the same as the energy class of the rest of the block of flats (80 %). Below we have collected the energy classes of residential buildings with their E-values (E-luku), which are explained in more detail in the text after the tables. You can also find the energy classes of all buildings on our website.

Energy classes of residential buildings

Small residential buildings (intended-use category 1 a-c) include single-family houses, two-family houses, buildings forming part of a linked house and other small houses. Small residential buildings are further divided into three groups based on heated net floor area: 50-150 m², over 150 m² and under or exactly 600 m², over 600 m². The tables below show the energy efficiency classes of small residential buildings by size group. A_netto in the table means heated net floor area (m²).

Small residential buildings, intended-use category 1 a-c
Energy efficiency class	E-value, kWh/(m² year)
Size group: 50 m² ≤ Anetto ≤ 150 m²
A	E-value ≤ 110 – 0.2 × Anetto
B	110 – 0.2 × Anetto < E-value ≤ 215 – 0.6 × Anetto
C	215 – 0.6 × Anetto < E-value ≤ 252 – 0.6 × Anetto
D	252 – 0.6 × Anetto < E-value ≤ 332 – 0.6 × Anetto
E	332 – 0.6 × Anetto < E-value ≤ 462 – 0.6 × Anetto
F	462 – 0.6 × Anetto < E-value ≤ 532 – 0.6 × Anetto
G	532 – 0.6 × Anetto< E-value
Size group: 150 m² < Anetto ≤ 600 m²
A	E-value ≤ 83 – 0.02 × Anetto
B	83 – 0.02 × Anetto < E-value ≤ 131 – 0.04 × Anetto
C	131 – 0.04 × Anetto < E-value ≤ 173 – 0.07 × Anetto
D	173 – 0.07 × Anetto < E-value ≤ 253 – 0.07 × Anetto
E	253 – 0.07 × Anetto < E-value ≤ 383 – 0.07 × Anetto
F	383 – 0.07 × Anetto < E-value ≤ 453 – 0.07 × Anetto
G	453 – 0.07 × Anetto < E-value
Size group: Anetto > 600 m²
A	E-value ≤ 70
B	71 ≤ E-value ≤ 106
C	107 ≤ E-value ≤ 130
D	131 ≤ E-value ≤ 210
E	211 ≤ E-value ≤ 340
F	341 ≤ E-value ≤ 410
G	411 ≤ E-value

The limits of the energy efficiency classes of small residential buildings (1 a-c) therefore always depend on the building’s heated net floor area. For example, a 100 m² detached house is in energy efficiency class B when its E-value is over 90 but under or exactly 155. (110 – 0.2 x 100 = 90 and 215 – 0.6 x 100 = 155.) With an E-value of 124 we therefore end up in energy class B. The E-value calculation examples article has more information on the subject.

Terraced houses and 2-storey blocks of flats (intended-use category 1d) covers terraced houses and blocks of flats with residential floors on no more than two storeys.

Terraced houses and 2-storey blocks of flats
Energy efficiency class	E-value, kWh/(m²year)
A	E-value ≤ 80
B	81 ≤ E-value ≤ 110
C	111 ≤ E-value ≤ 150
D	151 ≤ E-value ≤ 210
E	211 ≤ E-value ≤ 340
F	341 ≤ E-value ≤ 410
G	411 ≤ E-value

Blocks of flats (intended-use category 2) includes blocks of flats with residential floors on at least three storeys.

Blocks of flats
Energy efficiency class	E-value, kWh/(m²year)
A	E-value ≤ 75
B	76 ≤ E-value ≤ 100
C	101 ≤ E-value ≤ 130
D	131 ≤ E-value ≤ 160
E	161 ≤ E-value ≤ 190
F	191 ≤ E-value ≤ 240
G	241 ≤ E-value