Ministry of Internal Affairs and Communications monitors the cost of plumbing monthly.
The data below show the changes in the price indexes of plumbing charge between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Cost of plumbing (yen/m) |
| 1970 | 7.8 | 318 |
| 1971 | 9.0 | 367 |
| 1972 | 10.2 | 415 |
| 1973 | 13.3 | 542 |
| 1974 | 21.8 | 888 |
| 1975 | 25.2 | 1026 |
| 1976 | 27.6 | 1124 |
| 1977 | 31.5 | 1283 |
| 1978 | 33.5 | 1364 |
| 1979 | 36.0 | 1466 |
| 1980 | 41.5 | 1690 |
| 1981 | 44.4 | 1808 |
| 1982 | 46.0 | 1874 |
| 1983 | 47.6 | 1939 |
| 1984 | 48.9 | 1992 |
| 1985 | 50.4 | 2053 |
| 1986 | 51.7 | 2106 |
| 1987 | 52.6 | 2142 |
| 1988 | 54.0 | 2199 |
| 1989 | 56.9 | 2318 |
| 1990 | 59.9 | 2440 |
| 1991 | 64.7 | 2635 |
| 1992 | 70.3 | 2863 |
| 1993 | 76.4 | 3112 |
| 1994 | 79.9 | 3254 |
| 1995 | 82.0 | 3340 |
| 1996 | 85.2 | 3470 |
| 1997 | 88.8 | 3617 |
| 1998 | 90.5 | 3686 |
| 1999 | 91.1 | 3711 |
| 2000 | 91.5 | 3727 |
| 2001 | 92.4 | 3763 |
| 2002 | 92.2 | 3755 |
| 2003 | 92.7 | 3776 |
| 2004 | 93.1 | 3792 |
| 2005 | 93.0 | 3788 |
| 2006 | 93.1 | 3792 |
| 2007 | 94.2 | 3837 |
| 2008 | 97.6 | 3975 |
| 2009 | 99.2 | 4040 |
| 2010 | 100.0 | 4073 |
| 2011 | 101.5 | 4134 |
| 2012 | 102.4 | 4171 |
| 2013 | 102.8 | 4187 |
| 2014 | 107.3 | 4370 |
The next graph shows the changes in the cost of 1m plumbing from 1970 to 2014.
Source is Statistics Bureau. 消費者物価指数 (CPI) 結果
www.stat.go.jp/data/cpi/historic.htm
www.e-stat.go.jp/SG1/estat/Csvdl.do?sinfid=000011288564
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