In connection with this action, the CMA says this morning that it has also been investigating several investment firms that bought a large number of freeholds from two of these developers and continued to use these same ground rent terms.
The commitments signed by Aviva and Persimmon mean they have now agreed to the following:
Aviva will remove from leasehold contracts certain clauses which were doubling the ground rents payable by leaseholders. It will also remove terms which were originally doubling clauses and have been converted into RPI-based ground rent terms.
Doubling clauses that cause ground rents to double every 10 to 15 years mean people can often struggle to sell or mortgage their homes. They can also affect leaseholders' property rights. Where Aviva is the current freeholder, those leaseholders' ground rents will revert to the original amount - i.e. when the property was first sold - and this will not increase over time.
Aviva has also agreed to repay homeowners who were affected by these doubling ground rent clauses. This means that, where ground rents had increased, people will be refunded the excess money they had paid over this time.
Persimmon will offer leasehold house owners the option to buy the freehold of their property at a discount, better reflecting what they expected when they originally bought their house.
It will also make repayments to certain homeowners who have already purchased their freeholds.
This addresses concerns raised by consumers with the CMA and local Trading Standards, that they were led to believe they could buy their freehold at a certain price, only to find out later that this price had increased by thousands of pounds with no warning.
It also means those individuals who have already bought their freehold will receive a refund, meaning they don't miss out.
Persimmon has also agreed to extend the timeframe that prospective buyers are given to exchange contracts after reserving a property, and to provide people with more upfront information about the annual costs of buying a home.
This addresses concerns that the 'reservation period' - i.e. the period of time during which a potential buyer must take a number of steps to progress the purchase - is too short and can pressure the buyer into making a decision, and that more information is needed up-front for consumers to make purchasing decisions.
Andrea Coscelli, Chief Executive of the CMA, says: "This is a real win for thousands of leaseholders – for too long people have found themselves trapped in homes they can struggle to sell or been faced with unexpectedly high prices to buy their freehold. Now, they can breathe a sigh of relief knowing things are set to change for the better.
"It’s good that Aviva and Persimmon have responded positively to this investigation, enabling these issues to be fixed for leaseholders. But our work isn’t done. We now expect other housing developers and investors to follow the lead of Aviva and Persimmon. If not, they can expect to face legal action."
And Housing Secretary Robert Jenrick adds: "The Government asked the CMA to conduct this investigation – and I welcome their efforts to bring justice to homeowners affected by unfair practices, such as doubling ground rents, which have no place in our housing market.
"This settlement with Aviva and Persimmon is a hugely important step and demonstrates our commitment to support existing leaseholders who may have been mis-sold properties.
"We have also introduced new legislation that will protect future homeowners by restricting ground rents in new leases to zero and I would strongly urge other developers to follow suit in amending their historic practices."