The vacancy rate for the municipality, , was 0.73%. , the construction rate of new housing units was 3.7 new units per 1000 residents. there were 751 apartments in the municipality. The most common apartment size was the 5 room apartment of which there were 202. There were 16 single room apartments and 183 apartments with six or more rooms. the average price to rent an average apartment in Altnau was 1109.58 Swiss francs (CHF) per month (US$890, £500, €710 approx. exchange rate from 2000). The average rate for a one-room apartment was 466.43 CHF (US$370, £210, €300), a two-room apartment was about 728.08 CHF (US$580, £330, €470), a three-room apartment was about 787.67 CHF (US$630, £350, €500) and a six or more room apartment cost an average of 1543.68 CHF (US$1230, £690, €990). The average apartment price in Altnau was 99.4% of the national average of 1116 CHF.