EDGE certification means your home is independently verified to use at least 20% less energy and water than a standard home. In South Africa, EDGE-certified homebuyers can also qualify for green bonds, which come with lower interest rates or rebates from the major banks. Below is what an EDGE house includes, how green bonds work and what to avoid changing before final certification.
EDGE stands for Excellence in Design for Greater Efficiencies. It is an international green building certification system, supported locally by the Green Building Council of South Africa (GBCSA). EDGE certification assures homeowners that their home is designed and built to conserve energy and resources. An EDGE-certified house can save you 20% or more on your water and electricity bills.
If you buy an EDGE home, inspect it when you take occupation and check that the EDGE features were installed. Catching issues early helps protect your EDGE certification and the benefits that come with it.
A green bond is a home loan with preferential terms, offered by South African banks to buyers of EDGE-certified homes. Banks view certified green homes as lower-risk assets because lower utility costs make homeowners' budgets go further, so they reward buyers with a rate discount, a rebate or both.
Terms differ by bank and by development. Here is what the major banks offer*:
*Figures relevant at the time of writing (September 2026).
Your rebate depends on the development's EDGE certification status, so ask your bank or developer which stage your development has reached before you apply.
EDGE homes generally includes:
You can forfeit your green bond benefits and energy savings if you modify EDGE features before your home receives its final EDGE certification. To keep saving, do not:
EDGE stands for Excellence in Design for Greater Efficiencies. It is an international green building certification system supported in South Africa by the GBCSA.
An EDGE-certified house can save 20% or more on water and electricity bills.
A green bond is a home loan with preferential terms, such as a lower interest rate or a rebate, offered by South African banks to buyers of EDGE-certified homes.
Rate discounts of 0.25% are offered by banks such as Absa and FNB. Absa also offers a rebate of up to 3% of the loan value (capped at R55 000), and FNB offers cashback of up to R55 000 on qualifying homes under R2 million. Terms vary, so confirm current details with your bank.
Modifying EDGE features before final certification, such as replacing water-saving toilets or LED lights, can forfeit your green bond benefits and energy savings.
EDGE is more than a certificate. EDGE green building certification is a pathway to building smarter, saving more and making a positive environmental impact, one sustainable brick at a time.