People living near the site of a proposed new supermarket and more than 100 homes have warned the development will bring already heavy traffic to a standstill.
Housing association Notting Hill Housing submitted proposals to redevelop the Anmer Lodge daycare centre site in Stanmore to Harrow Borough Council last month.
The plans include more than 100 new homes and a Marks & Spencer mini supermarket.
Marylyn Summerfield, who lives in nearby Oak Lodge Close, said: “I think the whole development will have a dreadful effect on traffic.
“It is already very heavy in the mornings and most roads are usually at a standstill.”
Margot Chilton, 75, who also lives in the close, said: “It will just be chaos. The area already has too many cars going through it and it is already a massive problem.
“The development is too big and too intense and will just make the traffic event worse.”
And neighbour Judy Barker, who has lived in the area for 50 years, thinks it will spell the end for Stanmore.
She said: “Stanmore used to be a village and I used to love it so much. But the area is just too built up now and it’s not the same as it used to be.
MP for Harrow East Bob Blackman has objected to the plans.
He said: “The redevelopment of the Anmer Lodge site is of major contention in Stanmore and residents are rightly raising some serious concerns.
“There is no way around the fact that the site can only be accessed by a narrow residential road which is wholly unsuitable for the sheer volume of homes planned, not to mention the integrated supermarket.
“I believe that the residents need to be heard on this. These access issues must be addressed and the development scaled back into something more reasonable for the size and location of the site.”
Notting Hill Housing planning manager Roger Arkell said: “Our proposals for the Anmer Lodge site have been sensitively designed to respect the surrounding properties and to enhance this central location of Stanmore.
“The overall density of the development is well within the Greater London Authority’s guidelines for a site of this location.
He added throughout the consultation process the group carried out numerous traffic surveys with Harrow Borough Council.
He said: “We have made recommendations to Harrow Council for improvements to ensure that this scheme complements Stanmore and does not have a detrimental effect on the surrounding area.”
The development of the site in Coverdale Close was announced last year following a deal between Harrow Council, Notting Hill Housing and Marks & Spencer.