According to this the new Lea Bridge station will cost £6.5 million.

The Lea Bridge station is a reopening, using the existing platforms. A
better comparison might be the all-new station at Southend Airport, which
cost £16m in 2011.

These prices are insane. How could reinstating Lea Bridge station on
land which is presumably still owned by the railway cost as much as
buying 14 average London houses and the land they stand on? Southend
Airport station is quite nice with its enclosed footbridge and lifts on
both sides, but how could it cost as much as 78 average Southend houses
and the land they stand on? Somebody is getting very rich here, and I
bet it isn't the men with bricks in their hands.