Glass room – Perpendicular extension to a linear barn? Yes – possible. But even more so if the barn originally had perpendicular extensions to the form. This was commonplace for the functionality of the building. And if you have a record or historical reference to this – plans or pictures -then you have a case for reinstatement of the original form. Original form may have been developed over years -centuries even – but all relevant to use as justification in your planning application. This is now in for planning/listed building consent and with a positive pre app response – we’re looking for a positive outcome..