THE planned development at Station Road is threatening to descend into farce.
Disagreements over its internal layout and parking facilities could now derail the project.
Objections were raised at a Hillingdon Council planning meeting last Wednesday to plans to increase the number of homes at the site from 478 to 576.
There are also fears the planned valet parking will lead to severe congestion in surrounding roads during afternoon peak hours, with traffic surveys predicting some 123 vehicles entering the building in an hour.
The development could now face deadlock over housing density: developers want 288 units per hectare. The London Plan allows for only 260 at most.
Committee chairman, Councillor John Hensley, also raised fears about access for disabled drivers. He said: "The details of disabled parking have not been addressed. I can see trouble ahead."
The blizzard of objections led to the proposal being unanimously refused by the committee. It is back to the drawing board for developer Ballymore, ahead of the planning application appeal on September 30.
A spokesman for Ballymore said: "We were quite surprised, as we had a condition for approval until about an hour before.
"We were very surprised that there was this issue (of density) that we weren't told about as we were given no prior warning that there was anything wrong.
"It will delay the development, it will delay the building work externally and internally and it will delay the marketing of it.
"Ultimately the regeneration of Hayes has been delayed."
Meanwhile, work on the shell of the development will continue, but little else will be completed until final planning permission is approved.