Tamworth Borough Council names seven conservation areas, Albert Road and Victoria Street, Amington Green, Amington Hall Estate, Dosthill, Hospital Street, Tamworth Town and Wilnecote, and states that "Any works proposed within a conservation area will require planning consent." It states that some areas "are also subject to an Article 4 Direction, which further restricts development rights to protect the area's heritage", and links direction documents for five of them: Albert Road and Victoria Street, Amington Green, Hospital Street, Tamworth Town and Wilnecote. It records 175 listed buildings in Tamworth.
The Planning Portal states that planning permission is not usually needed for the "insertion of new windows and doors that are of a similar appearance to those used in the construction of the house", and that "a new bay window will be treated as an extension and may require permission". It adds that a listed building needs listed building consent for any significant works.
On building control the same source states that "Since 1 April 2002 building regulations have applied to all replacement glazing", and 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. Alongside it, the scheme you are registered with and what the certificate you hand over covers.