LEED® Canada for Homes

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Home Size Adjustment
 
The Home Size Adjustment compensates for the overarching effect of home size on resource consumption by adjusting the award-level point thresholds (for certified, silver, gold, and platinum) based on home size. The adjustments are based on material and energy impacts as described below under Rationale.
 
Rationale
 
All things being otherwise equal, a large home consumes more materials and energy than a small home over its lifecycle (including pre-construction, construction, use, and demolition or deconstruction). The adjustment compensates for these impacts by making it easier or harder to reach each LEED® Canada for Homes certification level. There is no impact on award thresholds for average-sized homes, whereas thresholds for smaller-than-average homes are lowered and thresholds for larger-than-average homes are raised.
 
Data from the U.S. Census Bureau in the American Housing Survey for 2005 shows a strong correlation between number of bedrooms and number of occupants. Although a home may serve many different households over its lifespan, in general, a home with more bedrooms will serve more people. The adjustment therefore categorizes homes by the number of bedrooms.
 
The relationship between home size and LEED® points is based on estimated energy and materials impacts within the context of the LEED® Canada for Homes Rating System. Available published data and informal studies of energy and materials usage in homes reveal two key relationships:
  • • A 100% increase in home size yields an increase in annual energy usage of 15% to 50%, depending on the design, location, and occupants of the home.
  • • A 100% increase in home size yields an increase in materials usage of 40% to 90%, depending on the design and location of the home.
These data were simplified and generalized to the assumption that as home size doubles, energy consumption increases by roughly one-quarter and material consumption increases by roughly one-half; combined, these amount to an increase in impact of roughly one-third with each doubling in home size. Thus the point adjustment equates to one-third of the points available in the Materials & Resources and Energy & Atmosphere categories combined for each doubling in home size.
 
 
Maximum Home Size (ft2) by number of bedrooms
Adjustment to
Awards Threshold
<= 1 Bedroom
2 Bedrooms
3 Bedrooms
4 Bedrooms
5 Bedrooms
 
714
1089
1497
2041
2245
 -10
742
1131
1556
2121
2333
 -9
772
1176
1617
2205
2425
 -8
802
1222
1680
2291
2520
 -7
833
1270
1746
2381
2619
 -6
866
1320
1815
2475
2722
 -5
900
1372
1886
2572
2829
 -4
935
1425
1960
2673
2940
 -3
972
1481
2037
2778
3055
 -2
1010
1540
2117
2887
3175
 -1
1050
1600
2200
3000
3300
 0 ("neutral")
1091
1663
2286
3118
3430
 +1
1134
1728
2376
3240
3564
 +2
1179
1796
2469
3367
3704
 +3
1225
1866
2566
3500
3850
 +4
1273
1940
2667
3637
4001
 +5
1323
2016
2772
3780
4158
 +6
1375
2095
2881
3928
4321
 +7
1429
2177
2994
4082
4491
 +8
1485
2263
3111
4243
4667
 +9
1543
2352
3233
4409
4850
 +10