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External is easy but a big job. Usually means ripping off siding, attach rigid foam panels, tyvek housewrap, and replace siding. Replacing windows and doors is sometimes done at the same time.
Expensive and best left to contractors.
Indoors means filling cavity with fibreglass wool and a vapour barrier. This is common when replacing a window. Not a huge job if you do one room at a time.
davidual
Terraced houses init. Next door provides the insulation. Unless you are unlucky as in Aggi's case where you are the end of the terrace, in which case you have a huge combined heat sink & cold bridge.
The real fuckers are pre 1950s detached houses and semis that either had single skinned brick walls or (if you were lucky) cavity walls with just an air-gap.
If I was in an EOT or the Edwardian semi we nearly bought, I'd get something on the exposed wall if I could. Suspect the boundaries might be an issue with external insulation which is a right fucker as internal is both shitter and a more of a ball ache to do.
Mrs Howard's parents gaff in Canada always amazed me with its ability to retain warmth despite the outside temperature being mega-cold.