Campaigners against plans that could see more than 5000 new homes built around Penrith are urging councillors to rethink proposals at a meeting tonight.
Eden District Council says the Penrith Strategic Masterplan would boost the local economy.
But opponents question whether this scale of development is needed and fear it would spoil the landscape and overwhelm the area's infrastructure.
The plans aim to expand the town over the next three decades and are expected to create 7,000 new jobs.
A planning officer at Friends of the Lake District said:
A spokesperson from the campaign group 'Keep Penrith Special' says "It’s absurd that the Council persists with calling this woeful and unlawful consultation an engagement, when they know full well that the rules governing public consultations applied."
A petition against the plans will be submitted at a public this evening at 6:45pm at Penrith Town Hall.