Ar yr un pryd, mae'n ofynnol i'n 222,000 o gartrefi cymdeithasol fodloni Safon Ansawdd Tai Cymru (WHQS) erbyn 2020. Mae hyn yn cynnwys cyrraedd safon arbed ynni o SAP (Gweithdrefn Asesu Safonol) 65 neu uwch (sy'n cyfateb i gyfradd D ar Dystysgrif Perfformiad Ynni).  Ym mis Mawrth 2017, roedd 88% o gartrefi cymdeithasol wedi cyrraedd SAP 65 neu uwch.  Rydym yn buddsoddi £108 miliwn yn WHQS bob blwyddyn, yn ogystal ag oddeutu £500m y flwyddyn wedi'i fuddsoddi gan landlordiaid. Mae'r gwaith yma'n cynnwys trwsio toeau, drysau a ffenestri a gosod boeleri defnyddio ynni'n effeithlon drwy gyfrannu at arbed ynni yn ein stoc dai.
In parallel, our 222,000 social homes are required to meet the Welsh Housing Quality Standard (WHQS) by 2020. This includes achieving an energy efficiency standard of SAP (Standard Assessment Procedure) 65 or higher (equivalent to an Energy Performance Certificate D rating).  In March 2017, 88% of social homes had achieved SAP 65 or higher.  We invest £108 million in WHQS every year, in addition to around £500m per annum invested by landlords. This work includes improving roofs, doors and windows and installing energy efficient boilers, thus contributing to the energy efficiency of our housing stock.