Dudley Council states that "Extensions and alterations which are normally permitted are controlled in designated areas by what is known as an Article 4 Direction. This means that planning permission must be obtained to make any changes to a property especially if it will be seen from the street, public footpath or public open spaces", and lists among the works needing permission under such a direction: "Remove, replace or alter windows and doors. Planning permission is also needed to insert a new window or door opening into an existing wall". It adds that "It is not the function of an Article 4 Direction to prevent you from altering or repairing your property, but it does allow the Council to give you advice about the best methods, design and building materials to use."
The council states that "We have identified 22 Conservation Areas in Dudley Borough" and that in conservation areas "planning permission is required for extension and alterations, these controls being applied more strictly in Mushroom Green, The Leasowes and Love Lane where an Article 4 direction is in-place". Its published table records five conservation areas in and around Stourbridge: High Street, Stourbridge, designated February 1975 and amended September 2005; Church Road, Oldswinford, February 1975; Love Lane, Oldswinford, September 1976 and amended April 1998; Stourbridge Branch Canal (Amblecote), March 1987 and amended April 2007; and Wollaston, January 1991.
The Planning Portal states that "An external window or door is a 'controlled fitting' under the Building Regulations" and that "Since 1 April 2002 building regulations have applied to all replacement glazing". It gives two routes: "an installer registered with the relevant competent person scheme", who provides a certificate on completion, or an unregistered installer or do it yourself, "in which case approval can be sought from the relevant Building Control Body".
We would explain how you check the conservation boundary, any Article 4 direction and the proposed work before confirming whether permission is needed, with the five Stourbridge areas and their designation dates listed on the same page.