When pressed on Theresa May's response to the fire, which has been criticised after she did not face the public during visits to the Grenfell site, Mr Green insisted she was as "distraught as anyone".
At least 70 people, including children and entire families, have been reported missing following the fire.
The report notes: "The cost of sprinklers per block or per flat will compare very favourably with other fire protection methods which might otherwise be required to provide acceptable levels of fire safety for older blocks, especially for blocks such as Lakanal House, which only have a single staircase".
"What we are doing is putting in place the support that will help them".
Finally, Britain kicks off Brexit negotiations with EU
Before May and the Tories lost their majority, there was no doubt Brexit meant Brexit. But he warned that "we need to get there via a slope, not via a cliff edge".
Mrs May announced on Thursday she was ordering a judge-led inquiry to ensure the events at the 24-storey block were "properly investigated". The death toll is expected to rise with dozens still missing.
Earlier, former Conservative cabinet minister Michael Portillo said her meeting with the emergency services was "a good thing" but that she "should have been there with the residents".
She will meet victims, volunteers and community leaders afterwards.
Mayor Khan wrote to May on Friday, saying residents felt increasingly enraged and frustrated by the slow response from the authorities.
Labour leader Jeremy Corbyn comforts a woman at St Clement's Church.
Grenfell Tower cladding banned in UK, Chancellor reveals
At least 30 people were killed in Wednesday's (NZT) fire and the death toll is expected to rise. The tragedy has provoked a huge response from nearby communities.
"That's one of the most awful things I have ever seen", Prince William said of the tower's blackened shell.
Dr Tomlin said he believed residents left the meeting feeling "reassured that they were listened to".
"This is an absolutely terrible fire that took place".
Some victims of the inferno may never be identified, the Met's commander Stuart Cundy said.
He said: "I thought the way they expressed themselves with a mixture of passion and reason was fantastic, and I hope it's the beginning of a process, not the end of a process, the beginning of a process of real listening between Government, RBKC (the Royal Borough of Kensington and Chelsea council), local residents, that will bring about lasting change".
Several people hurt after car strikes pedestrians in London, UK
On May 22, a suicide bomber killed 22 people at a concert by American pop singer Ariana Grande in Manchester in northern England. People were badly injured. "It's something we should not see". "Our prayers are with the victims", they said on Twitter .
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