I fod yn gymwys ar gyfer y cynllun, rhaid ichi drefnu prif forgais ad-dalu gydag un o'r rhoddwyr benthyciadau sydd wedi cofrestru dan gynllun Cymorth i Brynu – Cymru.
- Chorley Building Society
- Halifax Building Society
- Kensington Mortgages
- Leeds Building Society
- Leek Building Society
- Lloyds Banking Group
- Mansfield Building Society
- Monmouthshire Building Society
- Nationwide Building Society
- Pepper Money
- Platform Mortgages
- Precise Mortgages
- Principality Building Society
- Skipton Building Society
- Swansea Building Society
- Teachers Building Society
- The Cambridge Building Society
- The Melton Building Society
- The Mortgage Lender
- TSB