New and expanded viewing corridors proposed by the mayor of London could have a significant impact on a number of planned buildings in the capital, according to experts

The 10 existing viewing corridors have been widened, and two new corridors introduced under draft guidelines published last week.

A new viewing corridor from Parliament Hill to the Palace of Westminster could affect British Land’s 500,000ft2 North East Quarter scheme in Euston, according to planning consultants. Wilkinson Eyre has designed three towers up to 16 storeys for the scheme that could impinge on the proposed view.

British Land’s nearby £1bn redevelopment of Euston station, to be designed by Foreign Office Architects, could also be affected by this corridor, according to a consultant familiar with the proposals. He said: “The mayor wants to stop anything that detracts from the beauty of the area. Developers will be watching this very carefully.”

Expanded viewing corridors along the Thames would affect the developers of unbuilt schemes with permissions, such as Ian Simpson’s 1 Blackfriars and Foster + Partners’ Walbrook Square if either were forced to renew its planning consent.

The draft proposals could also affect the outcome of English Heritage and Westminster council’s High Court appeal on Coin Street Community Centre’s Doon Street tower on the South Bank, which is due to start on site on Monday.