Mae'r cynnydd parhaus ym mhrisiau tai yn golygu na all pobl, yn enwedig cenedlaethau iau, fforddio byw yn y cymunedau lle cawsant eu magu mwyach. Gall crynodiad uchel o ail gartrefi neu dai gwyliau gael effaith andwyol iawn ar gymunedau bach, ac mewn rhai ardaloedd gallai beryglu'r Gymraeg sy'n cael ei siarad ar lefel gymunedol.
The continuing rise of house prices mean people, especially younger generations, can no longer afford to live in the communities they have grown up in. A high concentration of second homes or holiday lets can have a very detrimental impact on small communities, and in some areas could compromise the Welsh language being spoken at a community level.