What is the minimum star rating for NatHERS for existing homes

Short Answer

There is no required minimum, but most older homes rate between 1.5 and 3.5 stars.

Full Answer

Unlike new homes, which must meet minimum star ratings under building codes, existing homes are not required to achieve a specific rating. The assessment is voluntary and intended to inform homeowners about performance gaps. Low ratings are common and often highlight key areas where energy upgrades would have the biggest impact.

Why this matters

Understanding your starting point can help you plan practical upgrades that lead to greater comfort, energy savings and improved property value.

How Certified Energy can help

We give you a clear breakdown of your rating and what it means. If you want to improve your star rating, we can also model upgrade options and predict the results before you begin work.

Related Regulations

• No minimum star rating applies to existing homes

• Some loan or rebate programs require a post-upgrade rating goal

Helpful Resources

• Do NatHERS for Existing Homes ratings expire?
• What is NatHERS for Existing Homes?
• Who can carry out a NatHERS for Existing Homes assessment?
• Can I use NatHERS for Existing Homes to apply for finance or upgrades?
• How to increase a NatHERS for Existing Homes rating?