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As of 2017, the collective works of H.G. Wells, including The Time Machine, are in the public domain. Not only that, Wikipedia also lists over a dozen stories based on The Time Machine, almost all ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/45805 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/45805 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
[As of 2017](https://en.wikipedia.org/wiki/2017_in_public_domain), the collective works of H.G. Wells, including _The Time Machine_, are in the public domain. Not only that, Wikipedia [also lists](https://en.wikipedia.org/wiki/The_Time_Machine#Sequels_by_other_authors) over a dozen stories based on _The Time Machine_, almost all of which were written before that date (I can only assume its US copyright expired much earlier) and only one of which is mentioned to have been authorised by Wells' estate. Even if _The Time Machine_ were still under copyright, you could still write that book, but you'd be limited to posting it on places like AO3 or FanFiction unless you could get permission from his estate to publish it - which is probably unlikely. In any case, the answer is: **Go for it!**