Construction tolerances - generally and specifically for planners

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    Construction tolerances - generally and specifically for planners

    We are in the process of renovating a Grade II listed early Victorian house, and the builders have put in a window that is the wrong size.

    There was previously a small window on the ground floor outrigger (approx 46cm x 70cm), and permission was granted to enlarge this to match another window on the second floor. The planning application specifically described "Replacing the window in the ground floor closet wing with a new window to match the existing window on the 2nd floor above to enhance the symmetry of the outrigger"

    On the plans on which planning permission and listed building consent were granted (both the proposed plans and demolition plans), the new GF window was drawn in proportion to the second floor window as intended. The plans were identical on the Stage 4A & 4B drawings we signed off on; however, in the Proposed Window Schedule this window was put "As Existing" and Type as "Refurb" (which we did not notice at the time).

    The second floor window is 59cm x 127cm. However, the window that was actually installed is only 46cm x 110cm. (So what was included in the Proposed Window Schedule was clearly an error).

    I know that there is always some acceptable level of variation versus plans, but is there a potential (credible) argument that this level of variation is acceptable a) based on generally accepted construction standards or b) to the planners? (The length is off by 13% or 17cm and the width is off by 22% or 13cm.) We have a JCR homeowners contract if that’s relevant.

    On the planning point, any thoughts on whether the planners might seek to have the window rectified? The window is at the rear of the property but well in view of lots of neighbours.

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