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Can't tell if you mean there is one full width dormer or two separate. If the latter - if it's in a conservation area or a listed property (?) the LA may have required a less dominant / more appropriate roof design for the property. Out in suburbia it is absolutely de rigueur to add a full width dormer box on the back of victorian/1930s terraces and semis using permitted development rights. So in principle totally possible subject to planning/ structural/building regs.
I have a fairly specific question regarding dormer Loft conversions. We have one along the length of our roof with two windows about 6 feet or so apart. The Space between the windows has not been converted and and still has the original rafters in place, meaning it can only be used as under eaves storage. Is this a common feature of dormer conversions, and is it in principle possible to Cut the rafters and convert that space too? Thanks so much and sorry for wrong use of roofing terms;)