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Heathrow has pledged to extend its property compensation scheme if a third runway is built.
The airport said in May that it would pay 25% above market value for 750 homes that would need to be compulsorily purchased.
The offer has now been extended to 3,750 homes close to the new runway that would not need to be bought, the BBC reported.
Homeowners in Poyle, Colnbrook, Brands Hill, Harmondsworth, Sipson, Harlington and Cranford Cross will be affected.
Residents would have the option of selling or remaining in their homes when construction begins.
Airport chief executive John Holland-Kaye said: “Where Heathrow purchases a property from a homeowner it will refurbish and sound insulate the property before reselling it on the open market.
This will allow new homeowners to come into the area, and some, whose homes have been lost, to stay in their community.
The new offer follows a consultation that ended in October. It remains subject to regulatory approval by the Civil Aviation Authority.