Liam Gallagher's plan to build a wall around his mock Tudor mansion would undermine the "open and green" street - and a swimming pool could damage his neighbour's foundations.
The former Oasis frontman has applied to Haringey Council for a new boundary wall, entrance gates, a swimming pool and pool plant at his £4m home in Highgate.
But Michael Hammerson, of conservation group The Highgate Society, has objected to Haringey Council about the plans.
Mr Hammerson wrote that enclosing the mock Tudor house behind a gate and wall would be "inimical" to the open character of the street.
He added: "The existing open and green front boundary is integral to the current street scene, and it would create a most unfortunate precedent – which would be applicable throughout the entire Neighbourhood Plan area - if the changes proposed to the front boundary were to be approved."
The objection says Gallagher's plans do not to take into account the immediate area, near "the important ancient woodland of Highgate Wood".
Mr Hammerson said the society had noted press reports about the Wonderwall singer's plans.
Liam's planning agent was quoted by the Daily Mail, saying: “The existing entrance gates and walls of the property do not provide the necessary privacy or security for the family.”
But the Highgate Society said this was "irrelevant" in the context of good planning and asked the council to make a decision "appropriate for the setting and the area".
Other fears highlighted include the impact of a swimming pool on the neighbours, who live in a listed building originally constructed for the 1924 Wembley Exhibition and then rebuilt in Highgate.
With no hydrology report for the society to investigate, Mr Hammerson warned the pool could "endanger" the building by altering the water table and threatening the foundations.
Gallagher's application stated: “It's important to note that many nearby properties feature swimming pools in varying shapes and sizes.”
The application will be decided by Haringey Council's planning committee at a future date.
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