I am fairly sure that these are included.
How much longer a journey was it to your old job?
Van Eynde 2007 (who I cited here) describes the Big Mess Construction as including "adjectival phrases which are introduced by as, so, too, how, this and that" (page 416). To me, "How much longer a journey was it to your old job?" seems to be included as it starts with "how". I guess you could argue that "how much" is different enough to count as a different introductory word.
Huddleston, Pullum et al. 2002:435 write
The degree adverb or determinative need not be modifying the adjective itself: it may be part of an AdvP modifying the adjective, as in It was so blatantly biased a report that no one took any notice of it.
(underlining replaced with bold since SE does not support underline formatting.)
Although this doesn't specifically mention How much, the word much is an adverb modifying the adjective longer in "How much longer...."
Theirs is no bigger a house than ours
Van Eynde 2007:417 states that
APs which are introduced by more or less [...] can either occur in the canonical position or in the exceptional one (Huddleston and Pullum, 2002, 435).
(6) a. This is a more serious problem than the other.
b. This is more serious a problem than the other.
Also here, the exceptional position is only possible in combination with the indefinite article.
Huddleston, Pullum et al. 2002:435 write
inflectional comparatives are restricted to internal position: Kim is a better player than Pat, not *Kim is better a player than Pat.
It isn't mentioned, but as far as I can tell negated synthetic comparatives such as "no bigger" can easily be placed in the "exceptional position" or after the noun.
I'm not sure how easily this or similar phrases can be placed in the "canonical position"; "a no bigger problem" sounds bad to me, but "a no less interesting conjecture" (cited by Jespersen 1914:436) sounds OK.
Works cited
Huddleston, Rodney; Pullum, Geoffrey K.; et al. (2002). The Cambridge Grammar of the English Language. Cambridge: Cambridge University Press.
Jespersen, Otto. A Modern English Grammar on Historical Principles, Part 2. Syntax. Volume 1. Heidelberg: Carl Winter's Universitätsbuchhandlung.
Van Eynde, Frank (2007). "The Big Mess Construction", in Müller, Stefan (Ed.), Proceedings of the 14th International Conference on Head-Driven Phrase Structure Grammar, Stanford Department of Linguistics and CSLI’s LinGO Lab, 415–433. Page 416.