"The last thing you ever think is going to happen is a crane coming through your roof", he said.
Harvey was found on the first floor of one of the houses in Compton Close, Bow, after the 20-metre-high crane fell on Wednesday afternoon.
"As I looked around, the whole house was destroyed and crumbling around me".
The scene in Bow east London where a 20-metre crane has collapsed on to a house
Sam ran out of the house before rescuing his mother.
A construction worker still remains in a critical condition in hospital.
Four other people were injured.
The London Fire Brigade tweeted: "We've taken fourteen 999 calls to reports of a crane that has collapsed onto a building in Gale Street, Bow".
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A statement read: "We would like to extend our deepest condolences to the family who have lost their loved one as a result of the incident".
Work on the Watts Grove site began in 2018 where the one, two and three-bed shared ownership apartments are replacing an electrical substation building, according to the NU living website.
Its national officer Jerry Swain said: "The preliminary findings must be released in weeks, not months or years, to ensure that similar accidents are avoided in future". It was not known when they could return as the area has to be made safe.
A spokeswoman for Tower Hamlets said a rest centre has been set up to help people who are displaced and accommodation is being provided to those who need it.
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Mayor John Biggs, said: "Extremely anxious by crane collapse in Bow".
Firefighters are working to recover Ms Harvey's body safely, while the Metropolitan Police said an investigation is in its early stages and there have been no arrests.
He said it was important to "learn any lessons" and find out if there were "any errors" which led to the collapse. Click the link in the orange box below for details.
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